[Bug target/102166] [i386] AMX intrinsics and macros not defined in C++

[thiago at kde dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102166

--- Comment #3 from Thiago Macieira <thiago at kde dot org> ---
There appears to be some preprocessor magic behind the scenes because the
preprocessed output can't be compiled either:

$ gcc -no-integrated-cpp -Werror=implicit-function-declaration -c -xc test.cpp
test.cpp: In function ‘amx’:
test.cpp:10:5: error: implicit declaration of function ‘_tile_loadd’
[-Werror=implicit-function-declaration]
   10 |     _tile_loadd(0, 0, 0);
      |     ^~~~~~~~~~~
test.cpp:11:5: error: implicit declaration of function ‘_tile_release’
[-Werror=implicit-function-declaration]
   11 |     _tile_release();
      |     ^~~~~~~~~~~~~
cc1: some warnings being treated as errors