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Bug 5428

Summary: A lot of 'undeclared identifier' at 'mmintrin.h' (from immintrin.h) at SDL_cpuinfo.h:86
Product: SDL Reporter: Vitaly Novichkov <admin>
Component: buildAssignee: Sam Lantinga <slouken>
Status: RESOLVED INVALID QA Contact: Sam Lantinga <slouken>
Severity: trivial    
Priority: P2 CC: sezeroz
Version: 2.0.14   
Hardware: ARM   
OS: macOS 10.15   

Description Vitaly Novichkov 2020-12-30 23:20:56 UTC 
I tring to cross-compile the ARM64 build of my project, using next parameters:

I use the state of the 2.0.14 release.

```
cmake -G "Ninja" -DCMAKE_BUILD_TYPE=MinSizeRel -DCMAKE_OSX_ARCHITECTURES="arm64" ..
```

And I getting the big list of errors while using SDL_cpuinfo.h at my program. Probably because x86-specific SIMD calls was been used from the ARM-targeted build.


The log of errors:

```
FAILED: CMakeFiles/thextech.dir/src/game_main.cpp.o 
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/c++ -DGIT_BRANCH=\"master\" -DGIT_VERSION=\"e5fc17b\" -DTHEXTECH_VERSION_1=1 -DTHEXTECH_VERSION_2=3 -DTHEXTECH_VERSION_3=3 -DTHEXTECH_VERSION_4=1 -DTHEXTECH_VERSION_REL="" -I../lib/DirManager -I../lib/FileMapper -I../lib/fmt -I../lib/IniProcessor -I../lib/Utils/.. -I../src -I../lib -Ioutput/include -Ioutput/include/SDL2 -fvisibility-inlines-hidden -Os -DNDEBUG -arch arm64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk -mmacosx-version-min=10.11 -std=gnu++11 -MD -MT CMakeFiles/thextech.dir/src/game_main.cpp.o -MF CMakeFiles/thextech.dir/src/game_main.cpp.o.d -o CMakeFiles/thextech.dir/src/game_main.cpp.o -c ../src/game_main.cpp
In file included from ../src/game_main.cpp:32:
In file included from ../src/globals.h:32:
In file included from output/include/SDL2/SDL.h:38:
In file included from output/include/SDL2/SDL_cpuinfo.h:86:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/immintrin.h:14:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:33:5: error: use of undeclared identifier '__builtin_ia32_emms'; did you mean '__builtin_isless'?
    __builtin_ia32_emms();
    ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../include/c++/v1/math.h:647:12: note: '__builtin_isless' declared here
    return isless(__lcpp_x, __lcpp_y);
           ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk/usr/include/math.h:545:22: note: expanded from macro 'isless'
#define isless(x, y) __builtin_isless((x),(y))
                     ^
In file included from ../src/game_main.cpp:32:
In file included from ../src/globals.h:32:
In file included from output/include/SDL2/SDL.h:38:
In file included from output/include/SDL2/SDL_cpuinfo.h:86:
In file included from /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/immintrin.h:14:
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:33:25: error: too few arguments to function call, expected 2, have 0
    __builtin_ia32_emms();
                        ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:50:19: error: use of undeclared identifier '__builtin_ia32_vec_init_v2si'
    return (__m64)__builtin_ia32_vec_init_v2si(__i, 0);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:67:12: error: use of undeclared identifier '__builtin_ia32_vec_ext_v2si'
    return __builtin_ia32_vec_ext_v2si((__v2si)__m, 0);
           ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:129:19: error: use of undeclared identifier '__builtin_ia32_packsswb'
    return (__m64)__builtin_ia32_packsswb((__v4hi)__m1, (__v4hi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:159:19: error: use of undeclared identifier '__builtin_ia32_packssdw'
    return (__m64)__builtin_ia32_packssdw((__v2si)__m1, (__v2si)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:189:19: error: use of undeclared identifier '__builtin_ia32_packuswb'
    return (__m64)__builtin_ia32_packuswb((__v4hi)__m1, (__v4hi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:216:19: error: use of undeclared identifier '__builtin_ia32_punpckhbw'
    return (__m64)__builtin_ia32_punpckhbw((__v8qi)__m1, (__v8qi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:239:19: error: use of undeclared identifier '__builtin_ia32_punpckhwd'
    return (__m64)__builtin_ia32_punpckhwd((__v4hi)__m1, (__v4hi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:260:19: error: use of undeclared identifier '__builtin_ia32_punpckhdq'
    return (__m64)__builtin_ia32_punpckhdq((__v2si)__m1, (__v2si)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:287:19: error: use of undeclared identifier '__builtin_ia32_punpcklbw'
    return (__m64)__builtin_ia32_punpcklbw((__v8qi)__m1, (__v8qi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:310:19: error: use of undeclared identifier '__builtin_ia32_punpcklwd'
    return (__m64)__builtin_ia32_punpcklwd((__v4hi)__m1, (__v4hi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:331:19: error: use of undeclared identifier '__builtin_ia32_punpckldq'
    return (__m64)__builtin_ia32_punpckldq((__v2si)__m1, (__v2si)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:352:19: error: use of undeclared identifier '__builtin_ia32_paddb'; did you mean '__builtin_arm_addg'?
    return (__m64)__builtin_ia32_paddb((__v8qi)__m1, (__v8qi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:352:19: note: '__builtin_arm_addg' declared here
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:352:19: error: first argument of MTE builtin function must be a pointer ('__v8qi' (vector of 8 'char' values) invalid)
    return (__m64)__builtin_ia32_paddb((__v8qi)__m1, (__v8qi)__m2);
                  ^                    ~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:373:19: error: use of undeclared identifier '__builtin_ia32_paddw'; did you mean '__builtin_arm_addg'?
    return (__m64)__builtin_ia32_paddw((__v4hi)__m1, (__v4hi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:352:19: note: '__builtin_arm_addg' declared here
    return (__m64)__builtin_ia32_paddb((__v8qi)__m1, (__v8qi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:373:19: error: first argument of MTE builtin function must be a pointer ('__v4hi' (vector of 4 'short' values) invalid)
    return (__m64)__builtin_ia32_paddw((__v4hi)__m1, (__v4hi)__m2);
                  ^                    ~~~~~~~~~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:394:19: error: use of undeclared identifier '__builtin_ia32_paddd'; did you mean '__builtin_arm_addg'?
    return (__m64)__builtin_ia32_paddd((__v2si)__m1, (__v2si)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:352:19: note: '__builtin_arm_addg' declared here
    return (__m64)__builtin_ia32_paddb((__v8qi)__m1, (__v8qi)__m2);
                  ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/lib/clang/12.0.0/include/mmintrin.h:394:19: error: first argument of MTE builtin function must be a pointer ('__v2si' (vector of 2 'int' values) invalid)
    return (__m64)__builtin_ia32_paddd((__v2si)__m1, (__v2si)__m2);
                  ^                    ~~~~~~~~~~~~
fatal error: too many errors emitted, stopping now [-ferror-limit=]
20 errors generated.
ninja: build stopped: subcommand failed.
```
Comment 1 Vitaly Novichkov 2020-12-30 23:27:50 UTC 
I forgot to say, I do use Xcode 12.3 and CMake 3.18 to produce the build. ARM support was been added since Xcode 12. Older Xcode doesn't support ARM targets.
Comment 2 Vitaly Novichkov 2020-12-31 00:32:23 UTC 
Okay, I think, I know why this happens... It's probably because I had SDL2 at CMake external project side being built for x86_64 instead of ARM, I actually should to bypass the missing CMake argument to resolve this...
Comment 3 Ozkan Sezer 2020-12-31 00:45:27 UTC 
I believe you are using a generated SDL_config.h, either by cmake
or by configure, correct?  If that is the case, using such config
file for another arch, or for a multi-arch case where the arch'es
are not compatible like arm64 and x86_64, can cause problems.

If you are using a generated SDL_config.h, for which arch was it
generated? I guess it was x86_64?

One solution would be guarding HAVE_IMMINTRIN_H define by x86_64
or i386 checks. Something like the following maybe?

diff --git a/include/SDL_config.h.cmake b/include/SDL_config.h.cmake
--- a/include/SDL_config.h.cmake
+++ b/include/SDL_config.h.cmake
@@ -220,7 +220,9 @@
 #cmakedefine HAVE_INOTIFY_INIT 1
 #cmakedefine HAVE_INOTIFY_INIT1 1
 #cmakedefine HAVE_INOTIFY 1
+#if defined(__i386__) || defined(__x86_64__)
 #cmakedefine HAVE_IMMINTRIN_H 1
+#endif
 #cmakedefine HAVE_LIBUDEV_H 1
 #cmakedefine HAVE_LIBSAMPLERATE_H 1
 
diff --git a/include/SDL_config.h.in b/include/SDL_config.h.in
--- a/include/SDL_config.h.in
+++ b/include/SDL_config.h.in
@@ -221,7 +221,9 @@
 #undef HAVE_INOTIFY_INIT1
 #undef HAVE_INOTIFY
 #undef HAVE_IBUS_IBUS_H
+#if defined(__i386__) || defined(__x86_64__)
 #undef HAVE_IMMINTRIN_H
+#endif
 #undef HAVE_LIBUDEV_H
 #undef HAVE_LIBSAMPLERATE_H
Comment 4 Vitaly Novichkov 2020-12-31 00:58:10 UTC 
The reason of failure most probably because of missing bypassing of CMAKE_OSX_ARCHITECTURES flag into child external projects. I did that just now at all my dependencies, and checking the result now...
Comment 5 Vitaly Novichkov 2020-12-31 14:05:32 UTC 
Okay, I confirm that it's just pure mistake of my build chain that actually did build of SDL2 for x86_64 even the ARM requested for the main project. I fixed that mistake, and the project builds for ARM successfully.