[libc-commits] [libc] [libc][NFC] Selectively disable GCC warnings (PR #78462)

[Guillaume Chatelet via libc-commits]

================
@@ -25,6 +25,11 @@
 #include <immintrin.h>
 #endif
 
+// Disable GCC complaining about missing attributes when using SIMD types in
+// template specializations.
----------------
gchatelet wrote:

It doesn't say which ones ☹
```
[17/29] Building CXX object projects/libc/test/src/__support/FPUtil/CMakeFiles/libc.test.src.__support.FPUtil.fpbits_test.__unit__.__build__.dir/fpbits_test.cpp.o
In file included from /redacted/gchatelet/git/llvm-project/libc/src/string/memory_utils/x86_64/inline_memcpy.h:15,
                 from /redacted/gchatelet/git/llvm-project/libc/src/string/memory_utils/inline_memcpy.h:22,
                 from /redacted/gchatelet/git/llvm-project/libc/src/__support/CPP/string.h:14,
                 from /redacted/gchatelet/git/llvm-project/libc/src/__support/FPUtil/fpbits_str.h:12,
                 from /redacted/gchatelet/git/llvm-project/libc/test/src/__support/FPUtil/fpbits_test.cpp:10:
/redacted/gchatelet/git/llvm-project/libc/src/string/memory_utils/op_x86.h:122:37: warning: ignoring attributes on template argument ‘__m128i’ [-Wignored-attributes]
  122 | template <> struct is_vector<__m128i> : cpp::true_type {};
      |                                     ^
/redacted/gchatelet/git/llvm-project/libc/src/string/memory_utils/op_x86.h:123:44: warning: ignoring attributes on template argument ‘__m128i’ [-Wignored-attributes]
  123 | template <> struct cmp_is_expensive<__m128i> : cpp::true_type {};
      |                                            ^
/redacted/gchatelet/git/llvm-project/libc/src/string/memory_utils/op_x86.h:162:37: warning: ignoring attributes on template argument ‘__m256i’ [-Wignored-attributes]
  162 | template <> struct is_vector<__m256i> : cpp::true_type {};
      |                                     ^
/redacted/gchatelet/git/llvm-project/libc/src/string/memory_utils/op_x86.h:163:44: warning: ignoring attributes on template argument ‘__m256i’ [-Wignored-attributes]
  163 | template <> struct cmp_is_expensive<__m256i> : cpp::true_type {};
      |                                            ^

```

https://github.com/llvm/llvm-project/pull/78462