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

1.1.1.2 ! misho       1: # environ.m4 serial 5
        !             2: dnl Copyright (C) 2001-2004, 2006-2011 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])
                     12:   gt_CHECK_VAR_DECL([#include <unistd.h>], environ)
                     13:   if test $gt_cv_var_environ_declaration != yes; then
                     14:     HAVE_DECL_ENVIRON=0
                     15:   fi
                     16: ])
                     17: 
                     18: # Check if a variable is properly declared.
                     19: # gt_CHECK_VAR_DECL(includes,variable)
                     20: AC_DEFUN([gt_CHECK_VAR_DECL],
                     21: [
                     22:   define([gt_cv_var], [gt_cv_var_]$2[_declaration])
                     23:   AC_MSG_CHECKING([if $2 is properly declared])
                     24:   AC_CACHE_VAL([gt_cv_var], [
1.1.1.2 ! misho      25:     AC_COMPILE_IFELSE(
        !            26:       [AC_LANG_PROGRAM(
        !            27:          [[$1
        !            28:            extern struct { int foo; } $2;]],
        !            29:          [[$2.foo = 1;]])],
        !            30:       [gt_cv_var=no],
        !            31:       [gt_cv_var=yes])])
1.1       misho      32:   AC_MSG_RESULT([$gt_cv_var])
                     33:   if test $gt_cv_var = yes; then
1.1.1.2 ! misho      34:     AC_DEFINE([HAVE_]m4_translit($2, [a-z], [A-Z])[_DECL], 1,
1.1       misho      35:               [Define if you have the declaration of $2.])
                     36:   fi
                     37:   undefine([gt_cv_var])
                     38: ])