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Diffstat (limited to 'm4/putenv.m4')
| -rw-r--r-- | m4/putenv.m4 | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/m4/putenv.m4 b/m4/putenv.m4 new file mode 100644 index 0000000..43a5dc5 --- /dev/null +++ b/m4/putenv.m4 @@ -0,0 +1,39 @@ +# putenv.m4 serial 12 +dnl Copyright (C) 2002, 2003, 2004, 2005, 2006 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. + +dnl From Jim Meyering. +dnl +dnl Check whether putenv ("FOO") removes FOO from the environment. +dnl The putenv in libc on at least SunOS 4.1.4 does *not* do that. + +AC_DEFUN([gl_FUNC_PUTENV], +[AC_CACHE_CHECK([for SVID conformant putenv], jm_cv_func_svid_putenv, + [AC_RUN_IFELSE([AC_LANG_PROGRAM([AC_INCLUDES_DEFAULT],[ + /* Put it in env. */ + if (putenv ("CONFTEST_putenv=val")) + return 1; + + /* Try to remove it. */ + if (putenv ("CONFTEST_putenv")) + return 1; + + /* Make sure it was deleted. */ + if (getenv ("CONFTEST_putenv") != 0) + return 1; + + return 0; + ])], + jm_cv_func_svid_putenv=yes, + jm_cv_func_svid_putenv=no, + dnl When crosscompiling, assume putenv is broken. + jm_cv_func_svid_putenv=no) + ]) + if test $jm_cv_func_svid_putenv = no; then + AC_LIBOBJ(putenv) + AC_DEFINE(putenv, rpl_putenv, + [Define to rpl_putenv if the replacement function should be used.]) + fi +]) |