The relocatable-prog-wrapper module compiles some source files to a
launcher program on the fly. When it does this, it requires some definitions
to be present in config.h, stdlib.h, and so on. This is the purpose of the
gl_FUNC_*_SEPARATE macro.
The comment for gl_FUNC_SETENV_SEPARATE says
Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ).
The "No AC_LIBOBJ" restriction is because the relocatable-prog-wrapper does
not use libgnu.a, therefore there is no need to put these compilation units
into libgnu.a.
But there is also a second restriction: gl_FUNC_SETENV_SEPARATE must not set
REPLACE_SETENV to 1. Because if it did so, and the package uses the
setenv() function but not the 'setenv' module, then the REPLACE_SETENV=1
setting will cause stdlib.h to contain "#define setenv rpl_setenv", leading
to a link error of the package.
Likewise for the other dependencies of relocatable-prog-wrapper.
2011-05-21 Bruno Haible <br...@clisp.org>
relocatable-prog-wrapper: Fix possible link error.
* m4/setenv.m4 (gl_FUNC_SETENV_SEPARATE): Move determination of
HAVE_SETENV and REPLACE_SETENV and AC_LIBOBJ invocation from here...
(gl_FUNC_SETENV): ... to here.
* m4/canonicalize.m4 (gl_CANONICALIZE_LGPL_SEPARATE): Update comment.
* m4/readlink.m4 (gl_FUNC_READLINK_SEPARATE): Likewise.
--- m4/canonicalize.m4.orig Sat May 21 23:36:56 2011
+++ m4/canonicalize.m4 Sat May 21 23:01:06 2011
@@ -1,4 +1,4 @@
-# canonicalize.m4 serial 18
+# canonicalize.m4 serial 19
dnl Copyright (C) 2003-2007, 2009-2011 Free Software Foundation, Inc.
@@ -44,7 +44,7 @@
])
# Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
-# (no AC_LIBOBJ).
+# (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
--- m4/readlink.m4.orig Sat May 21 23:36:56 2011
+++ m4/readlink.m4 Sat May 21 22:59:45 2011
@@ -1,4 +1,4 @@
-# readlink.m4 serial 9
+# readlink.m4 serial 10
dnl Copyright (C) 2003, 2007, 2009-2011 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
@@ -48,7 +48,8 @@
fi
])
-# Like gl_FUNC_READLINK, except prepare for separate compilation (no
AC_LIBOBJ).
+# Like gl_FUNC_READLINK, except prepare for separate compilation
+# (no REPLACE_READLINK, no AC_LIBOBJ).
AC_DEFUN([gl_FUNC_READLINK_SEPARATE],
[
AC_CHECK_FUNCS_ONCE([readlink])
--- m4/setenv.m4.orig Sat May 21 23:36:56 2011
+++ m4/setenv.m4 Sat May 21 23:03:23 2011
@@ -1,4 +1,4 @@
-# setenv.m4 serial 21
+# setenv.m4 serial 22
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,
@@ -7,20 +7,6 @@
AC_DEFUN([gl_FUNC_SETENV],
[
AC_REQUIRE([gl_FUNC_SETENV_SEPARATE])
- if test $HAVE_SETENV$REPLACE_SETENV != 10; then
- AC_LIBOBJ([setenv])
- fi
-])
-
-# Like gl_FUNC_SETENV, except prepare for separate compilation (no AC_LIBOBJ).
-AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
-[
- AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
- AC_CHECK_DECLS_ONCE([setenv])
- if test $ac_cv_have_decl_setenv = no; then
- HAVE_DECL_SETENV=0
- fi
- AC_CHECK_FUNCS_ONCE([setenv])
if test $ac_cv_func_setenv = no; then
HAVE_SETENV=0
else
@@ -50,9 +36,23 @@
[gl_cv_func_setenv_works="guessing no"])])
if test "$gl_cv_func_setenv_works" != yes; then
REPLACE_SETENV=1
- AC_LIBOBJ([setenv])
fi
fi
+ if test $HAVE_SETENV$REPLACE_SETENV != 10; then
+ AC_LIBOBJ([setenv])
+ fi
+])
+
+# Like gl_FUNC_SETENV, except prepare for separate compilation
+# (no REPLACE_SETENV, no AC_LIBOBJ).
+AC_DEFUN([gl_FUNC_SETENV_SEPARATE],
+[
+ AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
+ AC_CHECK_DECLS_ONCE([setenv])
+ if test $ac_cv_have_decl_setenv = no; then
+ HAVE_DECL_SETENV=0
+ fi
+ AC_CHECK_FUNCS_ONCE([setenv])
gl_PREREQ_SETENV
])
--
In memoriam Alfred Grünberg <http://en.wikipedia.org/wiki/Alfred_Grünberg>
