diff options
Diffstat (limited to 'gnulib-m4/uchar_h.m4')
| -rw-r--r-- | gnulib-m4/uchar_h.m4 | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/gnulib-m4/uchar_h.m4 b/gnulib-m4/uchar_h.m4 index bb8801b1..b2309385 100644 --- a/gnulib-m4/uchar_h.m4 +++ b/gnulib-m4/uchar_h.m4 @@ -1,9 +1,10 @@ # uchar_h.m4 -# serial 31 -dnl Copyright (C) 2019-2024 Free Software Foundation, Inc. +# serial 32 +dnl Copyright (C) 2019-2025 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. +dnl This file is offered as-is, without any warranty. dnl From Bruno Haible. dnl Prepare the overridden <uchar.h>. @@ -20,6 +21,34 @@ AC_DEFUN_ONCE([gl_UCHAR_H], fi AC_SUBST([HAVE_UCHAR_H]) + dnl On macOS 15, in C mode, <uchar.h> does not exist. But in C++ mode, + dnl it exists, and we need to #include_next it, otherwise we get an error + dnl "<cuchar> tried including <uchar.h> but didn't find libc++'s <uchar.h> + dnl header." + m4_ifdef([gl_ANSI_CXX], [AC_REQUIRE([gl_ANSI_CXX])]) + CXX_HAVE_UCHAR_H=0 + if test "$CXX" != no; then + AC_CACHE_CHECK([whether the C++ compiler has <uchar.h>], + [gl_cv_cxx_have_uchar_h], + [dnl We can't use AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]) here, due to + dnl an autoconf bug <https://savannah.gnu.org/support/?110294>. + cat > conftest.cpp <<\EOF +#include <uchar.h> +EOF + gl_command="$CXX $CXXFLAGS $CPPFLAGS -c conftest.cpp" + if AC_TRY_EVAL([gl_command]); then + gl_cv_cxx_have_uchar_h=yes + else + gl_cv_cxx_have_uchar_h=no + fi + rm -fr conftest* + ]) + if test $gl_cv_cxx_have_uchar_h = yes; then + CXX_HAVE_UCHAR_H=1 + fi + fi + AC_SUBST([CXX_HAVE_UCHAR_H]) + gl_TYPE_CHAR8_T gl_TYPE_CHAR16_T gl_TYPE_CHAR32_T @@ -59,7 +88,7 @@ EOF CXX_HAS_CHAR8_TYPE=0 if test $HAVE_UCHAR_H = 0; then if test "$CXX" != no; then - AC_CACHE_CHECK([whether the C++ compiler predefines the char8_t types], + AC_CACHE_CHECK([whether the C++ compiler predefines the char8_t type], [gl_cv_cxx_has_char8_type], [dnl We can't use AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]) here, due to dnl an autoconf bug <https://savannah.gnu.org/support/?110294>. |