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118 lines
3.8 KiB
Text
118 lines
3.8 KiB
Text
# Check for stdbool.h that conforms to C99.
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dnl Copyright (C) 2002-2006, 2009-2022 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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#serial 9
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# Prepare for substituting <stdbool.h> if it is not supported.
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AC_DEFUN([gl_STDBOOL_H],
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[
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AC_REQUIRE([AC_CHECK_HEADER_STDBOOL])
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AC_REQUIRE([AC_CANONICAL_HOST])
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dnl On some platforms, <stdbool.h> does not exist or does not conform to C99.
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dnl On Solaris 10 with CC=cc CXX=CC, <stdbool.h> exists but is not usable
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dnl in C++ mode (and no <cstdbool> exists). In this case, we use our
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dnl replacement, also in C mode (for binary compatibility between C and C++).
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if test "$ac_cv_header_stdbool_h" = yes; then
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case "$host_os" in
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solaris*)
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if test -z "$GCC"; then
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GL_GENERATE_STDBOOL_H=true
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else
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GL_GENERATE_STDBOOL_H=false
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fi
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;;
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*)
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GL_GENERATE_STDBOOL_H=false
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;;
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esac
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else
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GL_GENERATE_STDBOOL_H=true
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fi
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if test "$ac_cv_type__Bool" = yes; then
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HAVE__BOOL=1
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else
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HAVE__BOOL=0
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fi
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AC_SUBST([HAVE__BOOL])
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])
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m4_version_prereq([2.72], [], [
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AC_DEFUN([AC_CHECK_HEADER_STDBOOL],
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[AC_CHECK_TYPES([_Bool])
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AC_CACHE_CHECK([for stdbool.h that conforms to C99 or later],
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[ac_cv_header_stdbool_h],
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[AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[#include <stdbool.h>
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/* "true" and "false" should be usable in #if expressions and
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integer constant expressions, and "bool" should be a valid
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type name.
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Although C 1999 requires bool, true, and false to be macros,
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C 2023 and C++ 2011 overrule that, so do not test for that.
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Although C 1999 requires __bool_true_false_are_defined and
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_Bool, C 2023 says they are obsolescent, so do not require
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them. */
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#if !true
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#error "'true' is not true"
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#endif
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#if true != 1
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#error "'true' is not equal to 1"
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#endif
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char b[true == 1 ? 1 : -1];
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char c[true];
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#if false
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#error "'false' is not false"
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#endif
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#if false != 0
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#error "'false' is not equal to 0"
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#endif
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char d[false == 0 ? 1 : -1];
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enum { e = false, f = true, g = false * true, h = true * 256 };
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char i[(bool) 0.5 == true ? 1 : -1];
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char j[(bool) 0.0 == false ? 1 : -1];
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char k[sizeof (bool) > 0 ? 1 : -1];
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struct sb { bool s: 1; bool t; } s;
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char l[sizeof s.t > 0 ? 1 : -1];
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/* The following fails for
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HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
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bool m[h];
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char n[sizeof m == h * sizeof m[0] ? 1 : -1];
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char o[-1 - (bool) 0 < 0 ? 1 : -1];
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/* Catch a bug in an HP-UX C compiler. See
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https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
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https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html
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*/
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bool p = true;
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bool *pp = &p;
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]],
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[[
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bool ps = &s;
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*pp |= p;
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*pp |= ! p;
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/* Refer to every declared value, so they cannot be
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discarded as unused. */
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return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !j + !k
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+ !l + !m + !n + !o + !p + !pp + !ps);
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]])],
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[ac_cv_header_stdbool_h=yes],
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[ac_cv_header_stdbool_h=no])])
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])# AC_CHECK_HEADER_STDBOOL
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]) # m4_version_prereq 2.72
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