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libstdc++: Fix -Wnonnull warnings during configure

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We should not test for nan by passing it a null pointer, as this can
trigger -Wnonnull warnings.

Also fix an outdated comment about the default -std mode.

libstdc++-v3/ChangeLog:

	* acinclude.m4 (GLIBCXX_CHECK_C99_TR1): Use a non-null pointer
	to check for nan, nanf, and nanl.
	* configure: Regenerate.

(cherry picked from commit 6190a74ebee69415b501996821c92f60d892fb81)
This commit is contained in:
Jonathan Wakely 2023-05-12 12:17:08 +01:00
parent 2162c2082d
commit 81059051f8
2 changed files with 8 additions and 8 deletions
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8
libstdc++-v3/acinclude.m4
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@ -1620,7 +1620,7 @@ AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
AC_LANG_SAVE
AC_LANG_CPLUSPLUS
# Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
# Use -std=c++98 because -std=gnu++98 leaves __STRICT_ANSI__
# undefined and fake C99 facilities may be spuriously enabled.
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=c++98"
@ -1885,9 +1885,9 @@ AC_DEFUN([GLIBCXX_CHECK_C99_TR1], [
lround(0.0);
lroundf(0.0f);
lroundl(0.0l);
nan(0);
nanf(0);
nanl(0);
nan("");
nanf("");
nanl("");
nearbyint(0.0);
nearbyintf(0.0f);
nearbyintl(0.0l);

8
libstdc++-v3/configure vendored
View File

@ -19731,7 +19731,7 @@ ac_link='$CXX -o conftest$ac_exeext $CXXFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ex
ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
# Use -std=c++98 because the default (-std=gnu++98) leaves __STRICT_ANSI__
# Use -std=c++98 because -std=gnu++98 leaves __STRICT_ANSI__
# undefined and fake C99 facilities may be spuriously enabled.
ac_save_CXXFLAGS="$CXXFLAGS"
CXXFLAGS="$CXXFLAGS -std=c++98"
@ -20106,9 +20106,9 @@ typedef double_t my_double_t;
lround(0.0);
lroundf(0.0f);
lroundl(0.0l);
nan(0);
nanf(0);
nanl(0);
nan("");
nanf("");
nanl("");
nearbyint(0.0);
nearbyintf(0.0f);
nearbyintl(0.0l);