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libiconv 1.16

    1: # environ.m4 serial 7
    2: dnl Copyright (C) 2001-2004, 2006-2019 Free Software Foundation, Inc.
    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: 
    7: AC_DEFUN_ONCE([gl_ENVIRON],
    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: 
   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])
   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])
   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])])
   40:   if test $gt_cv_var = yes; then
   41:     AC_DEFINE([HAVE_]m4_translit($2, [a-z], [A-Z])[_DECL], 1,
   42:               [Define if you have the declaration of $2.])
   43:   fi
   44:   undefine([gt_cv_var])
   45: ])