signbit: Fix compilation error with g++ 5.5 on Solaris 10.

Reported by G. Branden Robinson <[email protected]> in <https://lists.gnu.org/archive/html/bug-gnulib/2024-11/msg00180.html>. * lib/math.in.h (signbit): In C++ 11 or newer, assume that <math.h> or <cmath> may define signbit through three inline functions.
coreutils · Dec 6, 2024 · 0c5c7fc · 0c5c7fc
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,11 @@
+2024-12-06  Bruno Haible  <[email protected]>
+
+	signbit: Fix compilation error with g++ 5.5 on Solaris 10.
+	Reported by G. Branden Robinson <[email protected]> in
+	<https://lists.gnu.org/archive/html/bug-gnulib/2024-11/msg00180.html>.
+	* lib/math.in.h (signbit): In C++ 11 or newer, assume that <math.h> or
+	<cmath> may define signbit through three inline functions.
+
 2024-12-06  Bruno Haible  <[email protected]>
 
 	Update build-aux/po/Makefile.in.in.

diff --git a/lib/math.in.h b/lib/math.in.h
@@ -2818,7 +2818,7 @@ _GL_EXTERN_C int gl_signbitl (long double arg);
 #  if defined signbit || defined GNULIB_NAMESPACE
 _GL_MATH_CXX_REAL_FLOATING_DECL_1 (signbit)
 #   undef signbit
-#   if __GNUC__ >= 6 || (defined __clang__ && !((defined __APPLE__ && defined __MACH__) || defined __FreeBSD__ || defined __OpenBSD__ || defined _AIX || (defined _WIN32 && !defined __CYGWIN__)))
+#   if __cplusplus >= 201103L || __GNUC__ >= 6 || (defined __clang__ && !((defined __APPLE__ && defined __MACH__) || defined __FreeBSD__ || defined __OpenBSD__ || defined _AIX || (defined _WIN32 && !defined __CYGWIN__)))
   /* This platform's <cmath> possibly defines signbit through a set of inline
      functions.  */
 _GL_MATH_CXX_REAL_FLOATING_DECL_2 (signbit, rpl_signbit, bool)