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47 lines
1.4 KiB
47 lines
1.4 KiB
# environ.m4 serial 6 |
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dnl Copyright (C) 2001-2004, 2006-2017 Free Software Foundation, Inc. |
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dnl This file is free software; the Free Software Foundation |
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dnl gives unlimited permission to copy and/or distribute it, |
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dnl with or without modifications, as long as this notice is preserved. |
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AC_DEFUN_ONCE([gl_ENVIRON], |
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[ |
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AC_REQUIRE([gl_UNISTD_H_DEFAULTS]) |
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dnl Persuade glibc <unistd.h> to declare environ. |
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AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS]) |
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AC_CHECK_HEADERS_ONCE([unistd.h]) |
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gt_CHECK_VAR_DECL( |
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[#if HAVE_UNISTD_H |
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#include <unistd.h> |
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#endif |
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/* mingw, BeOS, Haiku declare environ in <stdlib.h>, not in <unistd.h>. */ |
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#include <stdlib.h> |
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], |
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[environ]) |
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if test $gt_cv_var_environ_declaration != yes; then |
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HAVE_DECL_ENVIRON=0 |
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fi |
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]) |
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# Check if a variable is properly declared. |
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# gt_CHECK_VAR_DECL(includes,variable) |
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AC_DEFUN([gt_CHECK_VAR_DECL], |
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[ |
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define([gt_cv_var], [gt_cv_var_]$2[_declaration]) |
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AC_MSG_CHECKING([if $2 is properly declared]) |
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AC_CACHE_VAL([gt_cv_var], [ |
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AC_COMPILE_IFELSE( |
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[AC_LANG_PROGRAM( |
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[[$1 |
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extern struct { int foo; } $2;]], |
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[[$2.foo = 1;]])], |
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[gt_cv_var=no], |
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[gt_cv_var=yes])]) |
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AC_MSG_RESULT([$gt_cv_var]) |
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if test $gt_cv_var = yes; then |
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AC_DEFINE([HAVE_]m4_translit($2, [a-z], [A-Z])[_DECL], 1, |
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[Define if you have the declaration of $2.]) |
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fi |
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undefine([gt_cv_var]) |
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])
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