diff options
Diffstat (limited to 'gnulib-m4/stdckdint_h.m4')
| -rw-r--r-- | gnulib-m4/stdckdint_h.m4 | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/gnulib-m4/stdckdint_h.m4 b/gnulib-m4/stdckdint_h.m4 new file mode 100644 index 00000000..d269faa5 --- /dev/null +++ b/gnulib-m4/stdckdint_h.m4 @@ -0,0 +1,136 @@ +# stdckdint_h.m4 +# serial 1 +dnl Copyright 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 Written by Collin Funk. + +AC_DEFUN_ONCE([gl_STDCKDINT_H], +[ + gl_CHECK_NEXT_HEADERS([stdckdint.h]) + if test $ac_cv_header_stdckdint_h = yes; then + HAVE_STDCKDINT_H=1 + else + HAVE_STDCKDINT_H=0 + fi + AC_SUBST([HAVE_STDCKDINT_H]) + + if test $HAVE_STDCKDINT_H = 1; then + AC_CACHE_CHECK([whether stdckdint.h can be included in C], + [gl_cv_header_c_stdckdint_h], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdckdint.h> + ]])], + [gl_cv_header_c_stdckdint_h=yes], + [gl_cv_header_c_stdckdint_h=no])]) + if test $gl_cv_header_c_stdckdint_h = yes; then + HAVE_C_STDCKDINT_H=1 + AC_CACHE_CHECK([checking for an ISO C23 compliant stdckdint.h in C], + [gl_cv_header_c_stdckdint_h_works], + [AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#include <stdckdint.h> + ]], + [[int r; + int a = 1; + int b = 1; + return !!(ckd_add (&r, a, b) || ckd_sub (&r, a, b) + || ckd_mul (&r, a, b)); + ]])], + [gl_cv_header_c_stdckdint_h_works=yes], + [gl_cv_header_c_stdckdint_h_works=no])]) + if test $gl_cv_header_c_stdckdint_h_works = yes; then + HAVE_WORKING_C_STDCKDINT_H=1 + else + HAVE_WORKING_C_STDCKDINT_H=0 + fi + else + HAVE_C_STDCKDINT_H=0 + HAVE_WORKING_C_STDCKDINT_H=0 + fi + if test "$CXX" != no; then + AC_CACHE_CHECK([whether stdckdint.h can be included in C++], + [gl_cv_header_cxx_stdckdint_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 <stdckdint.h> +EOF + gl_command="$CXX $CXXFLAGS $CPPFLAGS -c conftest.cpp" + if AC_TRY_EVAL([gl_command]); then + gl_cv_header_cxx_stdckdint_h=yes + else + gl_cv_header_cxx_stdckdint_h=no + fi + rm -fr conftest* + ]) + if test $gl_cv_header_cxx_stdckdint_h = yes; then + HAVE_CXX_STDCKDINT_H=1 + AC_CACHE_CHECK([checking for an ISO C++26 compliant stdckdint.h in C++], + [gl_cv_header_cxx_stdckdint_h_works], + [dnl We can't use AC_LANG_PUSH([C++]) and AC_LANG_POP([C++]) here, due to + dnl an autoconf bug <https://savannah.gnu.org/support/?110294>. + cat > conftest.cpp <<\EOF +#include <stdckdint.h> +int +main (void) +{ + int r; + int a = 1; + int b = 1; + return !!(ckd_add (&r, a, b) || ckd_sub (&r, a, b) || ckd_mul (&r, a, b)); +} +EOF + gl_command="$CXX $CXXFLAGS $CPPFLAGS -c conftest.cpp" + if AC_TRY_EVAL([gl_command]); then + gl_cv_header_cxx_stdckdint_h_works=yes + else + gl_cv_header_cxx_stdckdint_h_works=no + fi + rm -fr conftest* + ]) + if test $gl_cv_header_cxx_stdckdint_h_works = yes; then + HAVE_WORKING_CXX_STDCKDINT_H=1 + else + HAVE_WORKING_CXX_STDCKDINT_H=0 + fi + else + HAVE_CXX_STDCKDINT_H=0 + HAVE_WORKING_CXX_STDCKDINT_H=0 + fi + fi + else + HAVE_C_STDCKDINT_H=0 + HAVE_WORKING_C_STDCKDINT_H=0 + HAVE_CXX_STDCKDINT_H=0 + HAVE_WORKING_CXX_STDCKDINT_H=0 + fi + AC_SUBST([HAVE_C_STDCKDINT_H]) + AC_SUBST([HAVE_WORKING_C_STDCKDINT_H]) + AC_SUBST([HAVE_CXX_STDCKDINT_H]) + AC_SUBST([HAVE_WORKING_CXX_STDCKDINT_H]) + + if test "$CXX" != no; then + dnl We might need the header for C or C++. + if test $HAVE_C_STDCKDINT_H = 1 \ + && test $HAVE_WORKING_C_STDCKDINT_H = 1 \ + && test $HAVE_CXX_STDCKDINT_H = 1 \ + && test $HAVE_WORKING_CXX_STDCKDINT_H = 1; then + GL_GENERATE_STDCKDINT_H=false + else + GL_GENERATE_STDCKDINT_H=true + fi + else + dnl We don't care about C++ here. + if test $HAVE_C_STDCKDINT_H = 1 \ + && test $HAVE_WORKING_C_STDCKDINT_H = 1; then + GL_GENERATE_STDCKDINT_H=false + else + GL_GENERATE_STDCKDINT_H=true + fi + fi +]) |