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Re:[RFA:] fix lack of #ifdef HAVE_C99_RUNTIME in builtins-20.c and elsewhere

+proc check_effective_target_c99_math { } {
+    global srcdir
+    return [check_no_compiler_messages c99_math assembly {
+	#include "builtins-config.h"
+	#ifndef HAVE_C99_RUNTIME
+	#error "No HAVE_C99_RUNTIME"
+	#endif
+    } -I$srcdir/gcc.dg ]
+}

This won't work when running the testsuite outside the build tree. Instead you need to either install the header file or have the compiler #define something with underscores (eg. __HAVE_C99_RUNTIME__). Patch is not OK.

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