diff options
Diffstat (limited to 'gl/m4/environ.m4')
| -rw-r--r-- | gl/m4/environ.m4 | 27 |
1 files changed, 19 insertions, 8 deletions
diff --git a/gl/m4/environ.m4 b/gl/m4/environ.m4 index 4c6849a3..593a33ed 100644 --- a/gl/m4/environ.m4 +++ b/gl/m4/environ.m4 @@ -1,5 +1,5 @@ -# environ.m4 serial 4 -dnl Copyright (C) 2001-2004, 2006-2010 Free Software Foundation, Inc. +# environ.m4 serial 6 +dnl Copyright (C) 2001-2004, 2006-2013 Free Software Foundation, Inc. dnl This file is free software; the Free Software Foundation dnl gives unlimited permission to copy and/or distribute it, dnl with or without modifications, as long as this notice is preserved. @@ -9,7 +9,16 @@ AC_DEFUN_ONCE([gl_ENVIRON], AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) dnl Persuade glibc <unistd.h> to declare environ. AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) - gt_CHECK_VAR_DECL([#include <unistd.h>], environ) + + AC_CHECK_HEADERS_ONCE([unistd.h]) + gt_CHECK_VAR_DECL( + [#if HAVE_UNISTD_H + #include <unistd.h> + #endif + /* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>. */ + #include <stdlib.h> + ], + [environ]) if test $gt_cv_var_environ_declaration != yes; then HAVE_DECL_ENVIRON=0 fi @@ -22,11 +31,13 @@ AC_DEFUN([gt_CHECK_VAR_DECL], define([gt_cv_var], [gt_cv_var_]$2[_declaration]) AC_MSG_CHECKING([if $2 is properly declared]) AC_CACHE_VAL([gt_cv_var], [ - AC_TRY_COMPILE([$1 - extern struct { int foo; } $2;], - [$2.foo = 1;], - gt_cv_var=no, - gt_cv_var=yes)]) + AC_COMPILE_IFELSE( + [AC_LANG_PROGRAM( + [[$1 + extern struct { int foo; } $2;]], + [[$2.foo = 1;]])], + [gt_cv_var=no], + [gt_cv_var=yes])]) AC_MSG_RESULT([$gt_cv_var]) if test $gt_cv_var = yes; then AC_DEFINE([HAVE_]m4_translit($2, [a-z], [A-Z])[_DECL], 1, |