# setenv.m4 serial 8 dnl Copyright (C) 2001-2004, 2006-2007 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([gl_FUNC_SETENV], [ AC_CHECK_FUNCS_ONCE([setenv]) if test $ac_cv_func_setenv = no; then AC_LIBOBJ([setenv]) gl_PREREQ_SETENV fi ]) # Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ). AC_DEFUN([gl_FUNC_SETENV_SEPARATE], [ AC_CHECK_FUNCS_ONCE([setenv]) gl_PREREQ_SETENV ]) AC_DEFUN([gl_FUNC_UNSETENV], [ AC_CHECK_FUNCS([unsetenv]) if test $ac_cv_func_unsetenv = no; then AC_LIBOBJ([unsetenv]) gl_PREREQ_UNSETENV else AC_CACHE_CHECK([for unsetenv() return type], gt_cv_func_unsetenv_ret, [AC_TRY_COMPILE([#include extern #ifdef __cplusplus "C" #endif #if defined(__STDC__) || defined(__cplusplus) int unsetenv (const char *name); #else int unsetenv(); #endif ], , gt_cv_func_unsetenv_ret='int', gt_cv_func_unsetenv_ret='void')]) if test $gt_cv_func_unsetenv_ret = 'void'; then AC_DEFINE(VOID_UNSETENV, 1, [Define if unsetenv() returns void, not int.]) fi 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_TRY_COMPILE([$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_]translit($2, [a-z], [A-Z])[_DECL], 1, [Define if you have the declaration of $2.]) fi ]) # Prerequisites of lib/setenv.c. AC_DEFUN([gl_PREREQ_SETENV], [ AC_REQUIRE([AC_FUNC_ALLOCA]) AC_CHECK_HEADERS_ONCE(unistd.h) AC_CHECK_HEADERS(search.h) AC_CHECK_FUNCS(tsearch) gt_CHECK_VAR_DECL([#include ], environ) ]) # Prerequisites of lib/unsetenv.c. AC_DEFUN([gl_PREREQ_UNSETENV], [ AC_CHECK_HEADERS_ONCE(unistd.h) gt_CHECK_VAR_DECL([#include ], environ) ])