diff options
Diffstat (limited to 'm4/stdbool.m4')
| -rw-r--r-- | m4/stdbool.m4 | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/m4/stdbool.m4 b/m4/stdbool.m4 deleted file mode 100644 index c67908aa8..000000000 --- a/m4/stdbool.m4 +++ /dev/null @@ -1,118 +0,0 @@ -# Check for stdbool.h that conforms to C99. - -dnl Copyright (C) 2002-2006, 2009-2022 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. - -#serial 9 - -# Prepare for substituting <stdbool.h> if it is not supported. - -AC_DEFUN([gl_STDBOOL_H], -[ - AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) - AC_REQUIRE([AC_CANONICAL_HOST]) - - dnl On some platforms, <stdbool.h> does not exist or does not conform to C99. - dnl On Solaris 10 with CC=cc CXX=CC, <stdbool.h> exists but is not usable - dnl in C++ mode (and no <cstdbool> exists). In this case, we use our - dnl replacement, also in C mode (for binary compatibility between C and C++). - if test "$ac_cv_header_stdbool_h" = yes; then - case "$host_os" in - solaris*) - if test -z "$GCC"; then - GL_GENERATE_STDBOOL_H=true - else - GL_GENERATE_STDBOOL_H=false - fi - ;; - *) - GL_GENERATE_STDBOOL_H=false - ;; - esac - else - GL_GENERATE_STDBOOL_H=true - fi - - if test "$ac_cv_type__Bool" = yes; then - HAVE__BOOL=1 - else - HAVE__BOOL=0 - fi - AC_SUBST([HAVE__BOOL]) -]) - -m4_version_prereq([2.72], [], [ - -AC_DEFUN([AC_CHECK_HEADER_STDBOOL], - [AC_CHECK_TYPES([_Bool]) - AC_CACHE_CHECK([for stdbool.h that conforms to C99 or later], - [ac_cv_header_stdbool_h], - [AC_COMPILE_IFELSE( - [AC_LANG_PROGRAM( - [[#include <stdbool.h> - - /* "true" and "false" should be usable in #if expressions and - integer constant expressions, and "bool" should be a valid - type name. - - Although C 1999 requires bool, true, and false to be macros, - C 2023 and C++ 2011 overrule that, so do not test for that. - Although C 1999 requires __bool_true_false_are_defined and - _Bool, C 2023 says they are obsolescent, so do not require - them. */ - - #if !true - #error "'true' is not true" - #endif - #if true != 1 - #error "'true' is not equal to 1" - #endif - char b[true == 1 ? 1 : -1]; - char c[true]; - - #if false - #error "'false' is not false" - #endif - #if false != 0 - #error "'false' is not equal to 0" - #endif - char d[false == 0 ? 1 : -1]; - - enum { e = false, f = true, g = false * true, h = true * 256 }; - - char i[(bool) 0.5 == true ? 1 : -1]; - char j[(bool) 0.0 == false ? 1 : -1]; - char k[sizeof (bool) > 0 ? 1 : -1]; - - struct sb { bool s: 1; bool t; } s; - char l[sizeof s.t > 0 ? 1 : -1]; - - /* The following fails for - HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */ - bool m[h]; - char n[sizeof m == h * sizeof m[0] ? 1 : -1]; - char o[-1 - (bool) 0 < 0 ? 1 : -1]; - /* Catch a bug in an HP-UX C compiler. See - https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html - https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html - */ - bool p = true; - bool *pp = &p; - ]], - [[ - bool ps = &s; - *pp |= p; - *pp |= ! p; - - /* Refer to every declared value, so they cannot be - discarded as unused. */ - return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k - + !l + !m + !n + !o + !p + !pp + !ps); - ]])], - [ac_cv_header_stdbool_h=yes], - [ac_cv_header_stdbool_h=no])]) -])# AC_CHECK_HEADER_STDBOOL - -]) # m4_version_prereq 2.72 |