[libc][complex] fix compiler support matrix for cfloat128

[Sh0g0-1758]

Before this patch, godbolt failed to compile cfloat128 with -ffreestanding but with the patch, the compilation succeeds, godbolt.

Fixes: #122500

cc: @nickdesaulniers

[llvmbot]

@llvm/pr-subscribers-libc

Author: Shourya Goel (Sh0g0-1758)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/122593.diff

1 Files Affected:

• (modified) libc/include/llvm-libc-types/cfloat128.h (+5-3)

diff --git a/libc/include/llvm-libc-types/cfloat128.h b/libc/include/llvm-libc-types/cfloat128.h
index f76a0c1c2f5af5..1a84cdf9de8d66 100644
--- a/libc/include/llvm-libc-types/cfloat128.h
+++ b/libc/include/llvm-libc-types/cfloat128.h
@@ -18,15 +18,17 @@
 //
 // TODO: Update the complex variant of C23 `_Float128` type detection again when
 // clang supports it.
-#if defined(__STDC_IEC_60559_COMPLEX__) && !defined(__clang__)
-#if !defined(__cplusplus)
+#if !defined(__clang__)
+#if defined(__STDC_IEC_60559_COMPLEX__) || defined(__SIZEOF_FLOAT128__)
+#if defined(__GNUC__) && !defined(__cplusplus)
 #define LIBC_TYPES_HAS_CFLOAT128
 typedef _Complex _Float128 cfloat128;
 #elif defined(__GNUC__) && __GNUC__ >= 13
 #define LIBC_TYPES_HAS_CFLOAT128
 typedef _Complex _Float128 cfloat128;
 #endif
-#elif __clang_major__ >= 11 &&                                                 \
+#endif
+#elif (__clang_major__ >= 11) &&                                               \
     (defined(__FLOAT128__) || defined(__SIZEOF_FLOAT128__))
 // Use _Complex __float128 type. clang uses __SIZEOF_FLOAT128__ or __FLOAT128__
 // macro to notify the availability of __float128 type:

[github-actions]

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