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Bug 1438 - SDL2 compile error on OS X -arch ppc
Summary: SDL2 compile error on OS X -arch ppc
Status: RESOLVED FIXED
Alias: None
Product: SDL
Classification: Unclassified
Component: *don't know* (show other bugs)
Version: HG 2.0
Hardware: x86_64 Mac OS X 10.6
: P2 normal
Assignee: Ryan C. Gordon
QA Contact: Sam Lantinga
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2012-03-03 03:56 UTC by Nikos Chantziaras
Modified: 2013-05-22 18:06 UTC (History)
1 user (show)

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Description Nikos Chantziaras 2012-03-03 03:56:53 UTC 
Configuring SDL2 (current hg) on OS X 10.6.8 with:

--enable-audio --disable-video --disable-render --disable-joystick --disable-haptic --disable-cdrom --disable-diskaudio CFLAGS="-arch ppc -O2 -pipe -mmacosx-version-min=10.5 -isysroot /Developer/SDKs/MacOSX10.5.sdk" CXXFLAGS="-arch ppc -O2 -pipe -mmacosx-version-min=10.5 -isysroot /Developer/SDKs/MacOSX10.5.sdk" LDFLAGS="-arch ppc -mmacosx-version-min=10.5 -Wl,-syslibroot,/Developer/SDKs/MacOSX10.5.sdk"

produces a build that fails:

libtool: compile:  gcc -arch ppc -O2 -fomit-frame-pointer -pipe -mmacosx-version-min=10.5 -isysroot /Developer/SDKs/MacOSX10.5.sdk -DUSING_GENERATED_CONFIG_H -Iinclude -I../SDL/include -maltivec -DTARGET_API_MAC_CARBON -DTARGET_API_MAC_OSX -fvisibility=hidden -D_THREAD_SAFE -falign-loops=16 -force_cpusubtype_ALL -fpascal-strings -Wall -MMD -MT build/SDL_blit_N.lo -c ../SDL/src/video/SDL_blit_N.c -o build/SDL_blit_N.o
../SDL/src/video/SDL_blit_N.c: In function 'ConvertAltivec32to32_noprefetch':
../SDL/src/video/SDL_blit_N.c:711: error: 'SDL_PixelFormat' has no member named 'alpha'
../SDL/src/video/SDL_blit_N.c:740: error: 'SDL_PixelFormat' has no member named 'alpha'
../SDL/src/video/SDL_blit_N.c: In function 'ConvertAltivec32to32_prefetch':
../SDL/src/video/SDL_blit_N.c:798: error: 'SDL_PixelFormat' has no member named 'alpha'
../SDL/src/video/SDL_blit_N.c:831: error: 'SDL_PixelFormat' has no member named 'alpha'
make: *** [build/SDL_blit_N.lo] Error 1
Comment 1 Nikos Chantziaras 2012-03-03 04:11:10 UTC 
OK, too much unneeded complexity.  It even fails with a simple:

configure CFLAGS="-arch ppc" LDFLAGS="-arch ppc"
Comment 2 buckyballreaction 2012-03-19 10:21:04 UTC 
Hi,

I came across this same error and wrote to the mailing with my findings:

http://lists.libsdl.org/pipermail/sdl-libsdl.org/2012-March/084160.html

Short answer to the workaround:  set SDL_ALTIVEC_BLITTERS to 0 in the file
SDL_config_macosx.h

D
Comment 3 buckyballreaction 2012-03-19 10:23:15 UTC 
I should explain the issue in more detail here in the bug:

From my e-mail:

---snip---
It looks like the 'alpha' member of the SDL_PixelFormat struct was
part of SDL 1.2 in the file SDL_video.h (my IDE jumped to the system
SDL header when I followed it by accident...)  It looks like that in
SDL 2.0, SDL_PixelFormat has moved to SDL_pixels.h and has removed the
'alpha' member.

However, there is left over code that uses the 'alpha' member in the
SDL_ALTIVEC_BLITTERS portion of SDL_blit_N.c and therefore fails to
compile when compiling for Mac OS X ppc (10.4/10.5)

As a workaround, you can set SDL_ALTIVEC_BLITTERS to 0 in the file
SDL_config_macosx.h; however, I do not know the effects of this (maybe
performance will suffer in some areas?)
---snap---
Comment 4 Sam Lantinga 2012-04-08 01:02:00 UTC 
I think this is fixed with this change:
http://hg.libsdl.org/SDL/rev/9821f5c9b7bd

Can you confirm?
Comment 5 buckyballreaction 2012-04-08 07:11:37 UTC 
Confirmed.  Compilation succeeds with SDL_ALTIVEC_BLITTERS set to 1 now.

Tested with cross-compile on Xcode 3.2.2 on Snow Leopard (10.6).
Comment 6 buckyballreaction 2013-05-22 18:06:18 UTC 
I just did a fresh PPC build with no alterations against the latest commit (53df899db00b).  SDL2 Builds with no problems.  SDL_ALTIVEC_BLITTERS was defined

Am I allowed to resolved this if I'm not the opener?