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

1.1.1.3 ! misho       1: # environ.m4 serial 7
        !             2: dnl Copyright (C) 2001-2004, 2006-2019 Free Software Foundation, Inc.
1.1       misho       3: dnl This file is free software; the Free Software Foundation
                      4: dnl gives unlimited permission to copy and/or distribute it,
                      5: dnl with or without modifications, as long as this notice is preserved.
                      6: 
1.1.1.2   misho       7: AC_DEFUN_ONCE([gl_ENVIRON],
1.1       misho       8: [
                      9:   AC_REQUIRE([gl_UNISTD_H_DEFAULTS])
                     10:   dnl Persuade glibc <unistd.h> to declare environ.
                     11:   AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
1.1.1.3 ! misho      12: 
        !            13:   AC_CHECK_HEADERS_ONCE([unistd.h])
        !            14:   gt_CHECK_VAR_DECL(
        !            15:     [#if HAVE_UNISTD_H
        !            16:      #include <unistd.h>
        !            17:      #endif
        !            18:      /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>.  */
        !            19:      #include <stdlib.h>
        !            20:     ],
        !            21:     [environ])
1.1       misho      22:   if test $gt_cv_var_environ_declaration != yes; then
                     23:     HAVE_DECL_ENVIRON=0
                     24:   fi
                     25: ])
                     26: 
                     27: # Check if a variable is properly declared.
                     28: # gt_CHECK_VAR_DECL(includes,variable)
                     29: AC_DEFUN([gt_CHECK_VAR_DECL],
                     30: [
                     31:   define([gt_cv_var], [gt_cv_var_]$2[_declaration])
1.1.1.3 ! misho      32:   AC_CACHE_CHECK([if $2 is properly declared], [gt_cv_var],
        !            33:     [AC_COMPILE_IFELSE(
        !            34:        [AC_LANG_PROGRAM(
        !            35:           [[$1
        !            36:             extern struct { int foo; } $2;]],
        !            37:           [[$2.foo = 1;]])],
        !            38:        [gt_cv_var=no],
        !            39:        [gt_cv_var=yes])])
1.1       misho      40:   if test $gt_cv_var = yes; then
1.1.1.2   misho      41:     AC_DEFINE([HAVE_]m4_translit($2, [a-z], [A-Z])[_DECL], 1,
1.1       misho      42:               [Define if you have the declaration of $2.])
                     43:   fi
                     44:   undefine([gt_cv_var])
                     45: ])