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Annotation of embedaddon/libiconv/srcm4/stdbool.m4, revision 1.1.1.2

1.1       misho       1: # Check for stdbool.h that conforms to C99.
                      2: 
1.1.1.2 ! misho       3: dnl Copyright (C) 2002-2006, 2009-2011 Free Software Foundation, Inc.
1.1       misho       4: dnl This file is free software; the Free Software Foundation
                      5: dnl gives unlimited permission to copy and/or distribute it,
                      6: dnl with or without modifications, as long as this notice is preserved.
                      7: 
1.1.1.2 ! misho       8: #serial 5
        !             9: 
1.1       misho      10: # Prepare for substituting <stdbool.h> if it is not supported.
                     11: 
                     12: AC_DEFUN([AM_STDBOOL_H],
                     13: [
1.1.1.2 ! misho      14:   AC_REQUIRE([AC_CHECK_HEADER_STDBOOL])
1.1       misho      15: 
                     16:   # Define two additional variables used in the Makefile substitution.
                     17: 
                     18:   if test "$ac_cv_header_stdbool_h" = yes; then
                     19:     STDBOOL_H=''
                     20:   else
                     21:     STDBOOL_H='stdbool.h'
                     22:   fi
                     23:   AC_SUBST([STDBOOL_H])
1.1.1.2 ! misho      24:   AM_CONDITIONAL([GL_GENERATE_STDBOOL_H], [test -n "$STDBOOL_H"])
1.1       misho      25: 
                     26:   if test "$ac_cv_type__Bool" = yes; then
                     27:     HAVE__BOOL=1
                     28:   else
                     29:     HAVE__BOOL=0
                     30:   fi
                     31:   AC_SUBST([HAVE__BOOL])
                     32: ])
                     33: 
                     34: # AM_STDBOOL_H will be renamed to gl_STDBOOL_H in the future.
                     35: AC_DEFUN([gl_STDBOOL_H], [AM_STDBOOL_H])
                     36: 
1.1.1.2 ! misho      37: # This version of the macro is needed in autoconf <= 2.68.
1.1       misho      38: 
1.1.1.2 ! misho      39: AC_DEFUN([AC_CHECK_HEADER_STDBOOL],
1.1       misho      40:   [AC_CACHE_CHECK([for stdbool.h that conforms to C99],
                     41:      [ac_cv_header_stdbool_h],
1.1.1.2 ! misho      42:      [AC_COMPILE_IFELSE(
        !            43:         [AC_LANG_PROGRAM(
        !            44:            [[
        !            45:              #include <stdbool.h>
        !            46:              #ifndef bool
        !            47:               "error: bool is not defined"
        !            48:              #endif
        !            49:              #ifndef false
        !            50:               "error: false is not defined"
        !            51:              #endif
        !            52:              #if false
        !            53:               "error: false is not 0"
        !            54:              #endif
        !            55:              #ifndef true
        !            56:               "error: true is not defined"
        !            57:              #endif
        !            58:              #if true != 1
        !            59:               "error: true is not 1"
        !            60:              #endif
        !            61:              #ifndef __bool_true_false_are_defined
        !            62:               "error: __bool_true_false_are_defined is not defined"
        !            63:              #endif
        !            64: 
        !            65:              struct s { _Bool s: 1; _Bool t; } s;
        !            66: 
        !            67:              char a[true == 1 ? 1 : -1];
        !            68:              char b[false == 0 ? 1 : -1];
        !            69:              char c[__bool_true_false_are_defined == 1 ? 1 : -1];
        !            70:              char d[(bool) 0.5 == true ? 1 : -1];
        !            71:              /* See body of main program for 'e'.  */
        !            72:              char f[(_Bool) 0.0 == false ? 1 : -1];
        !            73:              char g[true];
        !            74:              char h[sizeof (_Bool)];
        !            75:              char i[sizeof s.t];
        !            76:              enum { j = false, k = true, l = false * true, m = true * 256 };
        !            77:              /* The following fails for
        !            78:                 HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
        !            79:              _Bool n[m];
        !            80:              char o[sizeof n == m * sizeof n[0] ? 1 : -1];
        !            81:              char p[-1 - (_Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
        !            82:              /* Catch a bug in an HP-UX C compiler.  See
        !            83:                 http://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
        !            84:                 http://lists.gnu.org/archive/html/bug-coreutils/2005-11/msg00161.html
        !            85:               */
        !            86:              _Bool q = true;
        !            87:              _Bool *pq = &q;
        !            88:            ]],
        !            89:            [[
        !            90:              bool e = &s;
        !            91:              *pq |= q;
        !            92:              *pq |= ! q;
        !            93:              /* Refer to every declared value, to avoid compiler optimizations.  */
        !            94:              return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
        !            95:                      + !m + !n + !o + !p + !q + !pq);
        !            96:            ]])],
        !            97:         [ac_cv_header_stdbool_h=yes],
        !            98:         [ac_cv_header_stdbool_h=no])])
1.1       misho      99:    AC_CHECK_TYPES([_Bool])
1.1.1.2 ! misho     100: ])