libstdc++: guard c++config pragmas

c++config needs to be compilable as C, in which mode we complain about the
-Wc++ pragmas.

libstdc++-v3/ChangeLog:

	* include/bits/c++config: Don't try to disable -Wc++??-extensions
	when compiling as C.

diff --git a/libstdc++-v3/include/bits/c++config b/libstdc++-v3/include/bits/c++config
index 66d03cfd037520fa4929fd57d7d4bf916282f2bd..16c67b80e7694265f1c139aeb8557c4fbd4888b7 100644 (file)
--- a/libstdc++-v3/include/bits/c++config
+++ b/libstdc++-v3/include/bits/c++config
@@ -34,8 +34,10 @@
 
 #pragma GCC diagnostic push
 #pragma GCC diagnostic ignored "-Wvariadic-macros"
+#if __cplusplus
 #pragma GCC diagnostic ignored "-Wc++11-extensions"
 #pragma GCC diagnostic ignored "-Wc++23-extensions" // bf16
+#endif
 
 // The major release number for the GCC release the C++ library belongs to.
 #define _GLIBCXX_RELEASE