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| author | Sam Thursfield <sam.thursfield@codethink.co.uk> | 2012-12-21 14:22:22 +0000 |
|---|---|---|
| committer | Sam Thursfield <Sam Thursfield> | 2013-01-03 11:32:53 +0000 |
| commit | c2693d6d08db26825688ddca5de6eb8a4b7cde4a (patch) | |
| tree | 10611dcf065b1893421b83a9de53cf6feb83a048 /m4/environ.m4 | |
| parent | 861325a84f231a2a2da307b53ef5ff527d67e876 (diff) | |
| download | m4-c2693d6d08db26825688ddca5de6eb8a4b7cde4a.tar.gz | |
Commit files from tarball
Diffstat (limited to 'm4/environ.m4')
| -rw-r--r-- | m4/environ.m4 | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/m4/environ.m4 b/m4/environ.m4 new file mode 100644 index 00000000..7457ad13 --- /dev/null +++ b/m4/environ.m4 @@ -0,0 +1,38 @@ +# environ.m4 serial 5 +dnl Copyright (C) 2001-2004, 2006-2011 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. + +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) + if test $gt_cv_var_environ_declaration != yes; then + HAVE_DECL_ENVIRON=0 + fi +]) + +# Check if a variable is properly declared. +# gt_CHECK_VAR_DECL(includes,variable) +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_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, + [Define if you have the declaration of $2.]) + fi + undefine([gt_cv_var]) +]) |