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Bug 3780

Summary: GCC 7 implicit fallthrough warnings
Product: SDL Reporter: Martin Gerhardy <martin.gerhardy>
Component: buildAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: trivial    
Priority: P2 CC: icculus, sezeroz
Version: HG 2.1   
Hardware: All   
OS: All   

Description Martin Gerhardy 2017-08-28 06:58:01 UTC 
SDL_blit.h, SDL_fillrect.c and SDL_stdinc.h produces a lot of the (new) gcc-7 implicit fallthrough warnings.
Comment 1 Sam Lantinga 2017-08-28 16:31:45 UTC 
I don't have gcc 7 here, can you attach the output? Do you have a patch to fix the warnings?
Comment 2 Martin Gerhardy 2017-09-06 16:02:05 UTC 
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1274:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1277:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
             ++dst;
             ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 4:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1274:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:5: note: here
     case 3:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1274:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1277:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
             ++dst;
             ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 3:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1274:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:5: note: here
     case 2:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1274:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1277:13: warning: this statement may fall through [-Wimplicit-fallthrough=]
             ++dst;
             ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 2:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1274:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:482:5: note: here
     case 1:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1274:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c: In function ‘Blit_RGB565_32’:
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1390:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
             src += 2;
             ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:475:21: note: in definition of macro ‘DUFFS_LOOP8’
     case 0: do {    pixel_copy_increment;                               \
                     ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:5: note: here
     case 7:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1390:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
             src += 2;
             ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 7:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:5: note: here
     case 6:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1390:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
             src += 2;
             ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 6:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:5: note: here
     case 5:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1390:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
             src += 2;
             ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 5:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:5: note: here
     case 4:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1390:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
             src += 2;
             ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 4:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:5: note: here
     case 3:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1390:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
             src += 2;
             ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 3:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:5: note: here
     case 2:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1390:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
             src += 2;
             ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 2:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:482:5: note: here
     case 1:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:1387:9: note: in expansion of macro ‘DUFFS_LOOP’
         DUFFS_LOOP(
         ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c: In function ‘BlitNto1’:
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2022:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:475:21: note: in definition of macro ‘DUFFS_LOOP8’
     case 0: do {    pixel_copy_increment;                               \
                     ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:5: note: here
     case 7:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2022:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 7:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:5: note: here
     case 6:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2022:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 6:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:5: note: here
     case 5:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2022:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 5:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:5: note: here
     case 4:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2022:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 4:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:5: note: here
     case 3:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2022:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 3:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:5: note: here
     case 2:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2022:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 2:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:482:5: note: here
     case 1:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2012:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2054:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:475:21: note: in definition of macro ‘DUFFS_LOOP8’
     case 0: do {    pixel_copy_increment;                               \
                     ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:5: note: here
     case 7:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2054:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 7:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:5: note: here
     case 6:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2054:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 6:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:5: note: here
     case 5:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2054:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 5:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:5: note: here
     case 4:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2054:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 4:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:5: note: here
     case 3:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2054:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 3:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:5: note: here
     case 2:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2054:21: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 src += srcbpp;
                 ~~~~^~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 2:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:482:5: note: here
     case 1:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2044:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c: In function ‘Blit4to4MaskAlpha’:
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2098:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:475:21: note: in definition of macro ‘DUFFS_LOOP8’
     case 0: do {    pixel_copy_increment;                               \
                     ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:5: note: here
     case 7:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2098:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 7:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:5: note: here
     case 6:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2098:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 6:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:5: note: here
     case 5:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2098:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 5:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:5: note: here
     case 4:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2098:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 4:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:5: note: here
     case 3:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2098:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 3:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:5: note: here
     case 2:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2098:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:481:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 2:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:482:5: note: here
     case 1:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2094:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2115:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:475:21: note: in definition of macro ‘DUFFS_LOOP8’
     case 0: do {    pixel_copy_increment;                               \
                     ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:5: note: here
     case 7:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2115:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:476:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 7:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:5: note: here
     case 6:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2115:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:477:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 6:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:5: note: here
     case 5:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2115:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:478:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 5:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:5: note: here
     case 4:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2115:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
                 ++src;
                 ^~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:479:17: note: in definition of macro ‘DUFFS_LOOP8’
     case 4:     pixel_copy_increment;                                   \
                 ^~~~~~~~~~~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:480:5: note: here
     case 3:     pixel_copy_increment;                                   \
     ^
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit.h:501:5: note: in expansion of macro ‘DUFFS_LOOP8’
     DUFFS_LOOP8(pixel_copy_increment, width)
     ^~~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2111:13: note: in expansion of macro ‘DUFFS_LOOP’
             DUFFS_LOOP(
             ^~~~~~~~~~
/home/mgerhardy/dev/engine/contrib/libs/sdl2/src/video/SDL_blit_N.c:2115:17: warning: this statement may fall through [-Wimplicit-fallthrough=]
Comment 3 Sam Lantinga 2017-09-06 17:34:21 UTC 
That's an intentional explicit fallthrough. Is there a way to tell the compiler that?
Comment 4 Ryan C. Gordon 2017-09-06 18:58:26 UTC 
(In reply to Sam Lantinga from comment #3)
> That's an intentional explicit fallthrough. Is there a way to tell the
> compiler that?

case 0:
   whatever();
   __attribute__ ((fallthrough));  // tells gcc this is intentional.
case 1:
   something_else();
Comment 5 Ryan C. Gordon 2017-09-06 19:00:00 UTC 
(In reply to Ryan C. Gordon from comment #4)
>    __attribute__ ((fallthrough));  // tells gcc this is intentional.

(and gcc only needs this for actual fallthrough: if there's a noreturn function like exit(), or it falls into a case with nothing but a break/return, etc, it knows not to warn.)

Details: https://developers.redhat.com/blog/2017/03/10/wimplicit-fallthrough-in-gcc-7/

--ryan.
Comment 6 Ozkan Sezer 2017-09-06 19:05:08 UTC 
Something like the following at the offending places:

diff --git a/src/video/SDL_blit.h b/src/video/SDL_blit.h
--- a/src/video/SDL_blit.h
+++ b/src/video/SDL_blit.h
@@ -472,14 +472,14 @@
 #define DUFFS_LOOP8(pixel_copy_increment, width)                        \
 { int n = (width+7)/8;                                                  \
     switch (width & 7) {                                                \
-    case 0: do {    pixel_copy_increment;                               \
-    case 7:     pixel_copy_increment;                                   \
-    case 6:     pixel_copy_increment;                                   \
-    case 5:     pixel_copy_increment;                                   \
-    case 4:     pixel_copy_increment;                                   \
-    case 3:     pixel_copy_increment;                                   \
-    case 2:     pixel_copy_increment;                                   \
-    case 1:     pixel_copy_increment;                                   \
+    case 0: do {    pixel_copy_increment; /* fallthrough */             \
+    case 7:     pixel_copy_increment;     /* fallthrough */             \
+    case 6:     pixel_copy_increment;     /* fallthrough */             \
+    case 5:     pixel_copy_increment;     /* fallthrough */             \
+    case 4:     pixel_copy_increment;     /* fallthrough */             \
+    case 3:     pixel_copy_increment;     /* fallthrough */             \
+    case 2:     pixel_copy_increment;     /* fallthrough */             \
+    case 1:     pixel_copy_increment;     /* fallthrough */             \
         } while ( --n > 0 );                                            \
     }                                                                   \
 }

See https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
for -Wimplicit-fallthrough
Comment 7 Ryan C. Gordon 2017-09-06 19:17:56 UTC 
(In reply to Ozkan Sezer from comment #6)
> /* fallthrough */

Whoa, there's a regular expression parser for comments here.  :O

--ryam.
Comment 8 Sam Lantinga 2017-09-06 19:29:35 UTC 
Fixed, thanks!
https://hg.libsdl.org/SDL/rev/a09ca9e8938c

That comment trick is a neat one. :)