Mercurial > gnulib
view m4/environ.m4 @ 39906:39f09bed8945
Make better use of Autoconf.
* m4/environ.m4: Use AC_CACHE_CHECK where possible.
* m4/manywarnings.m4: Likewise.
* m4/manywarnings-c++.m4: Likewise.
* m4/socklen.m4: Likewise.
* m4/sockpfaf.m4: Likewise.
* m4/stdarg.m4: Likewise.
* m4/visibility.m4: Likewise.
* m4/fsusage.m4: Use AC_CACHE_CHECK where possible. Modernize
indentation.
* m4/ls-mntd-fs.m4: Likewise.
author | Bruno Haible <bruno@clisp.org> |
---|---|
date | Fri, 12 Oct 2018 02:42:44 +0200 |
parents | 10eb9086bea0 |
children | b06060465f09 |
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# environ.m4 serial 7 dnl Copyright (C) 2001-2004, 2006-2018 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]) 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 ]) # 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_CACHE_CHECK([if $2 is properly declared], [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])]) 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]) ])