/[autoconf]/autoconf/lib/autoconf/headers.m4
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revision 1.24 by akim, Tue Oct 22 12:02:08 2002 UTC revision 1.25 by akim, Tue Oct 22 12:34:22 2002 UTC
# Line 487  fi Line 487  fi
487  ])# AC_HEADER_STAT  ])# AC_HEADER_STAT
488    
489    
490    # AC_HEADER_STDBOOL
491    # -----------------
492    # Check for stdbool.h that conforms to C99.
493    AN_IDENTIFIER([bool], [AC_HEADER_STDBOOL])
494    AN_IDENTIFIER([true], [AC_HEADER_STDBOOL])
495    AN_IDENTIFIER([false],[AC_HEADER_STDBOOL])
496    AC_DEFUN([AC_HEADER_STDBOOL],
497    [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
498       [ac_cv_header_stdbool_h],
499       [AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
500          [[
501    #include <stdbool.h>
502    #ifndef bool
503    # error bool is not defined
504    #endif
505    #ifndef false
506    # error false is not defined
507    #endif
508    #if false
509    # error false is not 0
510    #endif
511    #ifndef true
512    # error false is not defined
513    #endif
514    #if true != 1
515    # error true is not 1
516    #endif
517    #ifndef __bool_true_false_are_defined
518    # error __bool_true_false_are_defined is not defined
519    #endif
520    
521            struct s { _Bool s: 1; _Bool t; } s;
522    
523            char a[true == 1 ? 1 : -1];
524            char b[false == 0 ? 1 : -1];
525            char c[__bool_true_false_are_defined == 1 ? 1 : -1];
526            char d[(bool) -0.5 == true ? 1 : -1];
527            bool e = &s;
528            char f[(_Bool) -0.0 == false ? 1 : -1];
529            char g[true];
530            char h[sizeof (_Bool)];
531            char i[sizeof s.t];
532          ]],
533          [[ return !a + !b + !c + !d + !e + !f + !g + !h + !i; ]])],
534          [ac_cv_header_stdbool_h=yes],
535          [ac_cv_header_stdbool_h=no])])
536    if test $ac_cv_header_stdbool_h = yes; then
537      AC_DEFINE(HAVE_STDBOOL_H, 1, [Define to 1 if stdbool.h conforms to C99.])
538    fi
539    ])# AC_HEADER_STDBOOL
540    
541    
542  # AC_HEADER_STDC  # AC_HEADER_STDC
543  # --------------  # --------------
544  # FIXME: I find this list very strange.  It comes from the original  # FIXME: I find this list very strange.  It comes from the original

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