[gcc r13-6299] libstdc++: Fix simd build failure on clang

[gcc r13-6299] libstdc++: Fix simd build failure on clang

[Matthias Kretz]

https://gcc.gnu.org/g:92c47b15d5af3e7f93d11ad69a45b6d1cb8661c5

commit r13-6299-g92c47b15d5af3e7f93d11ad69a45b6d1cb8661c5
Author: Matthias Kretz <m.kretz@gsi.de>
Date:   Mon Feb 20 11:13:44 2023 +0100

    libstdc++: Fix simd build failure on clang
    
    Clang does not support __attribute__ on lambdas. Therefore, only set
    _GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA if __clang__ is not defined.
    
    Signed-off-by: Matthias Kretz <m.kretz@gsi.de>
    
    libstdc++-v3/ChangeLog:
    
            PR libstdc++/108030
            * include/experimental/bits/simd_detail.h
            (_GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA): Define as empty for
            __clang__.

Diff:
---
 libstdc++-v3/include/experimental/bits/simd_detail.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libstdc++-v3/include/experimental/bits/simd_detail.h b/libstdc++-v3/include/experimental/bits/simd_detail.h
index a0ad10efe0f..30cc1ef0eef 100644
--- a/libstdc++-v3/include/experimental/bits/simd_detail.h
+++ b/libstdc++-v3/include/experimental/bits/simd_detail.h
@@ -254,15 +254,16 @@
 
 #ifdef __clang__
 #define _GLIBCXX_SIMD_NORMAL_MATH
+#define _GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA
 #else
 #define _GLIBCXX_SIMD_NORMAL_MATH                                              \
   [[__gnu__::__optimize__("finite-math-only,no-signed-zeros")]]
+#define _GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA __attribute__((__always_inline__))
 #endif
 #define _GLIBCXX_SIMD_NEVER_INLINE [[__gnu__::__noinline__]]
 #define _GLIBCXX_SIMD_INTRINSIC                                                \
   [[__gnu__::__always_inline__, __gnu__::__artificial__]] inline
 #define _GLIBCXX_SIMD_ALWAYS_INLINE [[__gnu__::__always_inline__]] inline
-#define _GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA __attribute__((__always_inline__))
 #define _GLIBCXX_SIMD_IS_UNLIKELY(__x) __builtin_expect(__x, 0)
 #define _GLIBCXX_SIMD_IS_LIKELY(__x) __builtin_expect(__x, 1)