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108 lines
3.5 KiB
108 lines
3.5 KiB
# Check for stdbool.h that conforms to C99. |
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dnl Copyright (C) 2002-2006, 2009-2017 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 7 |
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# Prepare for substituting <stdbool.h> if it is not supported. |
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AC_DEFUN([AM_STDBOOL_H], |
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[ |
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AC_REQUIRE([AC_CHECK_HEADER_STDBOOL]) |
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# Define two additional variables used in the Makefile substitution. |
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if test "$ac_cv_header_stdbool_h" = yes; then |
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STDBOOL_H='' |
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else |
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STDBOOL_H='stdbool.h' |
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fi |
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AC_SUBST([STDBOOL_H]) |
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AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"]) |
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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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# AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future. |
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AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H]) |
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# This version of the macro is needed in autoconf <= 2.68. |
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AC_DEFUN([AC_CHECK_HEADER_STDBOOL], |
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[AC_CACHE_CHECK([for stdbool.h that conforms to C99], |
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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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[[ |
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#include <stdbool.h> |
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#ifdef __cplusplus |
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typedef bool Bool; |
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#else |
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typedef _Bool Bool; |
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#ifndef bool |
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"error: bool is not defined" |
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#endif |
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#ifndef false |
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"error: false is not defined" |
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#endif |
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#if false |
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"error: false is not 0" |
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#endif |
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#ifndef true |
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"error: true is not defined" |
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#endif |
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#if true != 1 |
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"error: true is not 1" |
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#endif |
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#endif |
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#ifndef __bool_true_false_are_defined |
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"error: __bool_true_false_are_defined is not defined" |
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#endif |
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struct s { Bool s: 1; Bool t; bool u: 1; bool v; } s; |
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char a[true == 1 ? 1 : -1]; |
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char b[false == 0 ? 1 : -1]; |
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char c[__bool_true_false_are_defined == 1 ? 1 : -1]; |
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char d[(bool) 0.5 == true ? 1 : -1]; |
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/* See body of main program for 'e'. */ |
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char f[(Bool) 0.0 == false ? 1 : -1]; |
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char g[true]; |
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char h[sizeof (Bool)]; |
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char i[sizeof s.t]; |
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enum { j = false, k = true, l = false * true, m = true * 256 }; |
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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 n[m]; |
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char o[sizeof n == m * sizeof n[0] ? 1 : -1]; |
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char p[-1 - (Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1]; |
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/* Catch a bug in an HP-UX C compiler. See |
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http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html |
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http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html |
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*/ |
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Bool q = true; |
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Bool *pq = &q; |
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bool *qq = &q; |
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]], |
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[[ |
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bool e = &s; |
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*pq |= q; *pq |= ! q; |
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*qq |= q; *qq |= ! q; |
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/* Refer to every declared value, to avoid compiler optimizations. */ |
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return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l |
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+ !m + !n + !o + !p + !q + !pq + !qq); |
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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_TYPES([_Bool]) |
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])
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