Issue #14964 has been updated by ahorek (Pavel Rosick).

Status changed from Closed to Assigned

@k0kubun
the problem is that c compiler doesn't allow to use __builtin_xxx macros if not specifically enabled with arguments like -msse4.1, but transform_mjit_header.rb ignores all passed cflags for some reason.

this simple patch fixes the issue for me https://github.com/ruby/ruby/pull/2059

----------------------------------------
Bug #14964: [MJIT] missing builtin methods
https://bugs.ruby-lang.org/issues/14964#change-75919

* Author: ahorek (Pavel Rosick)
* Status: Assigned
* Priority: Normal
* Assignee: k0kubun (Takashi Kokubun)
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
----------------------------------------
I'm having trouble building Ruby 2.6 on Windows.

this is the first error:
```
building rb_mjit_header.h
rb_mjit_header.h updated
building .ext/include/x64-mingw32/rb_mjit_min_header-2.6.0.h
./miniruby.exe -I../ruby_2_6/lib -I. -I.ext/common  ../ruby_2_6/tool/transform_mjit_header.rb "x86_64-w64-mingw32-gcc " rb_mjit_header.h .ext/include/x64-mingw32/rb_mjit_min_header-2.6.0.h
error in initial header file:
C:/Users/pdaho/AppData/Local/Temp/20180805-10076-12b1zho.c:1: warning: "__STDC__" redefined
 #define __STDC__ 1

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-10076-12b1zho.c:2: warning: "__STDC_VERSION__" redefined
 #define __STDC_VERSION__ 201710L

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-10076-12b1zho.c:3: warning: "__STDC_UTF_16__" redefined
 #define __STDC_UTF_16__ 1

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-10076-12b1zho.c:4: warning: "__STDC_UTF_32__" redefined
 #define __STDC_UTF_32__ 1

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-10076-12b1zho.c:5: warning: "__STDC_HOSTED__" redefined
 #define __STDC_HOSTED__ 1

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-10076-12b1zho.c:29: warning: "__BIGGEST_ALIGNMENT__" redefined
 #define __BIGGEST_ALIGNMENT__ 32

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-10076-12b1zho.c: In function '__crc32b':
C:/Users/pdaho/AppData/Local/Temp/20180805-10076-12b1zho.c:6216:10: error: implicit declaration of function '__builtin_ia32_crc32qi'; did you mean '__builtin_ia32_rolqi'? [-Werror=implicit-function-declaration]
   return __builtin_ia32_crc32qi (__C, __V);
          ^~~~~~~~~~~~~~~~~~~~~~
          __builtin_ia32_rolqi
compilation terminated due to -Wfatal-errors.
cc1.exe: some warnings being treated as errors
make: *** [.ext/include/x64-mingw32/rb_mjit_min_header-2.6.0.h] Error 1
rm x64-msvcrt-ruby260.rc
rake aborted!
```

I tried various CFLAGS, it looks like -mcrc32 helped
```
building rb_mjit_header.h
rb_mjit_header.h updated
building .ext/include/x64-mingw32/rb_mjit_min_header-2.6.0.h
./miniruby.exe -I../ruby_2_6/lib -I. -I.ext/common  ../ruby_2_6/tool/transform_mjit_header.rb "x86_64-w64-mingw32-gcc " rb_mjit_header.h .ext/include/x64-mingw32/rb_mjit_min_header-2.6.0.h
error in initial header file:
C:/Users/pdaho/AppData/Local/Temp/20180805-1196-12y4d1j.c:1: warning: "__STDC__" redefined
 #define __STDC__ 1

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-1196-12y4d1j.c:2: warning: "__STDC_VERSION__" redefined
 #define __STDC_VERSION__ 201710L

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-1196-12y4d1j.c:3: warning: "__STDC_UTF_16__" redefined
 #define __STDC_UTF_16__ 1

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-1196-12y4d1j.c:4: warning: "__STDC_UTF_32__" redefined
 #define __STDC_UTF_32__ 1

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-1196-12y4d1j.c:5: warning: "__STDC_HOSTED__" redefined
 #define __STDC_HOSTED__ 1

<built-in>: note: this is the location of the previous definition
C:/Users/pdaho/AppData/Local/Temp/20180805-1196-12y4d1j.c: In function '_mm_stream_sd':
C:/Users/pdaho/AppData/Local/Temp/20180805-1196-12y4d1j.c:9317:3: error: implicit declaration of function '__builtin_ia32_movntsd'; did you mean '__builtin_ia32_movntpd'? [-Werror=implicit-function-declaration]
   __builtin_ia32_movntsd (__P, (__v2df) __Y);
   ^~~~~~~~~~~~~~~~~~~~~~
   __builtin_ia32_movntpd
compilation terminated due to -Wfatal-errors.
cc1.exe: some warnings being treated as errors
make: *** [.ext/include/x64-mingw32/rb_mjit_min_header-2.6.0.h] Error 1
rm x64-msvcrt-ruby260.rc
rake aborted!
```
I tried to add -march=barcelona -mtune=barcelona -msse4a as the gcc documentation says, but it didn't help. It looks like these instruction are SSE4a specific and some headers are missing.

rev. https://github.com/ruby/ruby/commit/88975c821c99b852959958e2934de68a45be15e6
Windows 10 64bit, x86_64-w64-mingw32
GCC 7.2.0 - http://downloads.sourceforge.net/project/mingw-w64/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/7.2.0/threads-win32/seh
AMD FX-8300 8C

I can compile the lastest Ruby 2.5.1 with the same options.

Is it a known problem? Maybe GCC isn't supported on Windows yet?

---Files--------------------------------
mjitheaders.zip (1.31 MB)
diff.diff (3.65 KB)
rb_mjit_header_msys2.zip (673 KB)
diff_msys2.diff (1.75 MB)
env.txt (2.58 KB)
output_archflag_72.txt (109 KB)
output_optflag_81.txt (83.3 KB)
output_witharch_81.txt (31 KB)
shippable_node_pools.png (31.7 KB)


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