Compiling a gnulib testdir on macOS 11/arm64, I get this error:
c++ -DHAVE_CONFIG_H -DEXEEXT=\"\" -I. -I../../gltests -I..
-DGNULIB_STRICT_CHECKING=1 -DIN_GNULIB_TESTS=1 -I. -I../../gltests -I..
-I../../gltests/.. -I../gllib -I../../gltests/../gllib -I/Users/haible/include
-Wall -g -O2 -MT test-list-c++.o -MD -MP -MF $depbase.Tpo -c -o
test-list-c++.o ../../gltests/test-list-c++.cc &&\
mv -f $depbase.Tpo $depbase.Po
In file included from ../../gltests/test-list-c++.cc:20:
In file included from ../../gltests/../gllib/gl_list.hh:26:
In file included from ../gllib/stdlib.h:36:
In file included from
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/stdlib.h:100:
../gllib/math.h:3095:43: error: 'isnan' is missing exception specification
'throw()'
_GL_MATH_CXX_REAL_FLOATING_DECL_2 (isnan, isnan, bool)
^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/math.h:535:1:
note: previous declaration is here
isnan(float __lcpp_x) _NOEXCEPT { return __libcpp_isnan(__lcpp_x); }
^
This patch fixes it.
2021-03-20 Bruno Haible <br...@clisp.org>
math C++ tests: Fix compilation error on macOS 11.2.
* lib/math.in.h (isnan): For clang >= 12 on macOS, declare 'rpl_isnan',
not 'isnan'.
diff --git a/lib/math.in.h b/lib/math.in.h
index 335505d..bbe86ad 100644
--- a/lib/math.in.h
+++ b/lib/math.in.h
@@ -2579,7 +2579,7 @@ _GL_EXTERN_C int rpl_isnanl (long double x)
_GL_ATTRIBUTE_CONST;
# if defined isnan || defined GNULIB_NAMESPACE
_GL_MATH_CXX_REAL_FLOATING_DECL_1 (isnan)
# undef isnan
-# if __GNUC__ >= 6 || (defined __clang__ && !((defined __APPLE__ && defined
__MACH__) || (defined __FreeBSD__ && __clang_major__ < 7) || defined
__OpenBSD__ || (defined _WIN32 && !defined __CYGWIN__)))
+# if __GNUC__ >= 6 || (defined __clang__ && !((defined __APPLE__ && defined
__MACH__ && __clang_major__ < 12) || (defined __FreeBSD__ && __clang_major__ <
7) || defined __OpenBSD__ || (defined _WIN32 && !defined __CYGWIN__)))
/* This platform's <cmath> possibly defines isnan through a set of inline
functions. */
_GL_MATH_CXX_REAL_FLOATING_DECL_2 (isnan, rpl_isnan, bool)
