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Annotation of embedaddon/libiconv/srcm4/stdbool.m4, revision 1.1.1.3

1.1       misho       1: # Check for stdbool.h that conforms to C99.
                      2: 
1.1.1.3 ! misho       3: dnl Copyright (C) 2002-2006, 2009-2019 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: 
1.1.1.3 ! misho       8: #serial 7
1.1.1.2   misho       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>
1.1.1.3 ! misho      46: 
        !            47:              #ifdef __cplusplus
        !            48:               typedef bool Bool;
        !            49:              #else
        !            50:               typedef _Bool Bool;
        !            51:               #ifndef bool
        !            52:                "error: bool is not defined"
        !            53:               #endif
        !            54:               #ifndef false
        !            55:                "error: false is not defined"
        !            56:               #endif
        !            57:               #if false
        !            58:                "error: false is not 0"
        !            59:               #endif
        !            60:               #ifndef true
        !            61:                "error: true is not defined"
        !            62:               #endif
        !            63:               #if true != 1
        !            64:                "error: true is not 1"
        !            65:               #endif
1.1.1.2   misho      66:              #endif
1.1.1.3 ! misho      67: 
1.1.1.2   misho      68:              #ifndef __bool_true_false_are_defined
                     69:               "error: __bool_true_false_are_defined is not defined"
                     70:              #endif
                     71: 
1.1.1.3 ! misho      72:              struct s { Bool s: 1; Bool t; bool u: 1; bool v; } s;
1.1.1.2   misho      73: 
                     74:              char a[true == 1 ? 1 : -1];
                     75:              char b[false == 0 ? 1 : -1];
                     76:              char c[__bool_true_false_are_defined == 1 ? 1 : -1];
                     77:              char d[(bool) 0.5 == true ? 1 : -1];
                     78:              /* See body of main program for 'e'.  */
1.1.1.3 ! misho      79:              char f[(Bool) 0.0 == false ? 1 : -1];
1.1.1.2   misho      80:              char g[true];
1.1.1.3 ! misho      81:              char h[sizeof (Bool)];
1.1.1.2   misho      82:              char i[sizeof s.t];
                     83:              enum { j = false, k = true, l = false * true, m = true * 256 };
                     84:              /* The following fails for
                     85:                 HP aC++/ANSI C B3910B A.05.55 [Dec 04 2003]. */
1.1.1.3 ! misho      86:              Bool n[m];
1.1.1.2   misho      87:              char o[sizeof n == m * sizeof n[0] ? 1 : -1];
1.1.1.3 ! misho      88:              char p[-1 - (Bool) 0 < 0 && -1 - (bool) 0 < 0 ? 1 : -1];
1.1.1.2   misho      89:              /* Catch a bug in an HP-UX C compiler.  See
1.1.1.3 ! misho      90:                 https://gcc.gnu.org/ml/gcc-patches/2003-12/msg02303.html
        !            91:                 https://lists.gnu.org/r/bug-coreutils/2005-11/msg00161.html
1.1.1.2   misho      92:               */
1.1.1.3 ! misho      93:              Bool q = true;
        !            94:              Bool *pq = &q;
        !            95:              bool *qq = &q;
1.1.1.2   misho      96:            ]],
                     97:            [[
                     98:              bool e = &s;
1.1.1.3 ! misho      99:              *pq |= q; *pq |= ! q;
        !           100:              *qq |= q; *qq |= ! q;
1.1.1.2   misho     101:              /* Refer to every declared value, to avoid compiler optimizations.  */
                    102:              return (!a + !b + !c + !d + !e + !f + !g + !h + !i + !!j + !k + !!l
1.1.1.3 ! misho     103:                      + !m + !n + !o + !p + !q + !pq + !qq);
1.1.1.2   misho     104:            ]])],
                    105:         [ac_cv_header_stdbool_h=yes],
                    106:         [ac_cv_header_stdbool_h=no])])
1.1       misho     107:    AC_CHECK_TYPES([_Bool])
1.1.1.2   misho     108: ])