diff options
Diffstat (limited to 'gnulib-m4/assert_h.m4')
-rw-r--r-- | gnulib-m4/assert_h.m4 | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/gnulib-m4/assert_h.m4 b/gnulib-m4/assert_h.m4 new file mode 100644 index 0000000..c1306da --- /dev/null +++ b/gnulib-m4/assert_h.m4 @@ -0,0 +1,61 @@ +# assert-h.m4 +dnl Copyright (C) 2011-2022 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 From Paul Eggert. + +AC_DEFUN([gl_ASSERT_H], +[ + AC_CACHE_CHECK([for static_assert], [gl_cv_static_assert], + [gl_save_CFLAGS=$CFLAGS + for gl_working in "yes, a keyword" "yes, an <assert.h> macro"; do + AS_CASE([$gl_working], + [*assert.h*], [CFLAGS="$gl_save_CFLAGS -DINCLUDE_ASSERT_H"]) + + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[#if defined __clang__ && __STDC_VERSION__ < 202311 + #pragma clang diagnostic error "-Wc2x-extensions" + #pragma clang diagnostic error "-Wc++17-extensions" + #endif + #ifdef INCLUDE_ASSERT_H + #include <assert.h> + #endif + static_assert (2 + 2 == 4, "arithmetic does not work"); + static_assert (2 + 2 == 4); + ]], + [[ + static_assert (sizeof (char) == 1, "sizeof does not work"); + static_assert (sizeof (char) == 1); + ]])], + [gl_cv_static_assert=$gl_working], + [gl_cv_static_assert=no]) + CFLAGS=$gl_save_CFLAGS + test "$gl_cv_static_assert" != no && break + done]) + + GL_GENERATE_ASSERT_H=false + AS_CASE([$gl_cv_static_assert], + [yes*keyword*], + [AC_DEFINE([HAVE_C_STATIC_ASSERT], [1], + [Define to 1 if the static_assert keyword works.])], + [no], + [GL_GENERATE_ASSERT_H=true + gl_NEXT_HEADERS([assert.h])]) + + dnl The "zz" puts this toward config.h's end, to avoid potential + dnl collisions with other definitions. #undef assert so that + dnl programs are not tempted to use it without specifically + dnl including assert.h. Break the #undef apart with a comment + dnl so that 'configure' does not comment it out. + AH_VERBATIM([zzstatic_assert], +[#if (!defined HAVE_C_STATIC_ASSERT && !defined assert \ + && (!defined __cplusplus \ + || (__cpp_static_assert < 201411 \ + && __GNUG__ < 6 && __clang_major__ < 6))) + #include <assert.h> + #undef/**/assert +#endif]) +]) |