Re: linker-script.m4?

[Simon Josefsson]

Here is a complete patch, including documentation.  It also avoids the
need to modify configure.ac.  Sorry for spamming.

Objections?

/Simon

>From ef0300261126cdf57471b36317b84f4d48a3af13 Mon Sep 17 00:00:00 2001
From: Simon Josefsson <address@hidden>
Date: Mon, 2 Mar 2009 11:02:16 +0100
Subject: [PATCH] linker-script: New module.

---
 ChangeLog              |    7 +++++++
 doc/gnulib.texi        |    3 +++
 doc/linker-script.texi |   26 ++++++++++++++++++++++++++
 m4/linker-script.m4    |   39 +++++++++++++++++++++++++++++++++++++++
 modules/linker-script  |   14 ++++++++++++++
 5 files changed, 89 insertions(+), 0 deletions(-)
 create mode 100644 doc/linker-script.texi
 create mode 100644 m4/linker-script.m4
 create mode 100644 modules/linker-script

diff --git a/ChangeLog b/ChangeLog
index e4e8ffd..8679984 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+2009-03-02  Simon Josefsson  <address@hidden>
+
+       * doc/gnulib.texi: Add section for linker script.
+       * modules/linker-script: New module.
+       * m4/linker-script.m4: New file.
+       * doc/linker-script.texi: New file.
+
 2009-03-02  Jim Meyering  <address@hidden>
 
        announce-gen: new option: --no-print-checksums
diff --git a/doc/gnulib.texi b/doc/gnulib.texi
index d2a3a13..3f68013 100644
--- a/doc/gnulib.texi
+++ b/doc/gnulib.texi
@@ -5825,6 +5825,7 @@ This list of functions is sorted according to the header 
that declares them.
 * func::
 * warnings::
 * manywarnings::
+* Library Version Scripts::
 @end menu
 
 @node alloca
@@ -5917,6 +5918,8 @@ generated automatically.
 
 @include manywarnings.texi
 
address@hidden linker-script.texi
+
 @node GNU Free Documentation License
 @appendix GNU Free Documentation License
 
diff --git a/doc/linker-script.texi b/doc/linker-script.texi
new file mode 100644
index 0000000..26a270d
--- /dev/null
+++ b/doc/linker-script.texi
@@ -0,0 +1,26 @@
address@hidden Library Version Scripts
address@hidden Library Version Scripts
+
+The @code{linker-script} module can be used to add shared library
+versioning support.  You use the module by importing it to your
+library, and then add the following lines to the @code{Makefile.am}
+that builds the library:
+
address@hidden
+if HAVE_LD_VERSION_SCRIPT
+libfoo_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libfoo.map
+endif
address@hidden smallexample
+
+The version script file format is documented in the GNU LD manual, but
+a small example would be:
+
address@hidden
+LIBFOO_1.0 @{
+  global:
+    libfoo_init; libfoo_doit; libfoo_done;
+
+  local:
+    *;
address@hidden;
address@hidden smallexample
diff --git a/m4/linker-script.m4 b/m4/linker-script.m4
new file mode 100644
index 0000000..796f107
--- /dev/null
+++ b/m4/linker-script.m4
@@ -0,0 +1,39 @@
+# linker-script.m4 serial 1
+dnl Copyright (C) 2008, 2009 Free Software Foundation, Inc.
+dnl This file is free software; the Free Software Foundation
+dnl gives unlimited permission to copy and/or distribute it,
+dnl with or without modifications, as long as this notice is preserved.
+
+dnl From Simon Josefsson
+
+# gl_LINKER_SCRIPT
+# -------------
+# Check if ld supports linker scripts, and define automake conditional
+# HAVE_LD_VERSION_SCRIPT if so.
+AC_DEFUN([gl_LINKER_SCRIPT],
+[
+  AC_ARG_ENABLE([ld-version-script],
+    AS_HELP_STRING([--enable-ld-version-script],
+      [enable/disable linker version script (default is enabled when 
possible)]),
+      [have_ld_version_script=$enableval], [])
+  if test -z "$have_ld_version_script"; then
+    AC_MSG_CHECKING([if -Wl,--version-script works])
+    save_LDFLAGS="$LDFLAGS"
+    LDFLAGS="$LDFLAGS -Wl,--version-script=conftest.map"
+    cat > conftest.map <<EOF
+VERS_1 {
+       global: sym;
+};
+
+VERS_2 {
+        global: sym;
+} VERS_1;
+EOF
+    AC_LINK_IFELSE(AC_LANG_PROGRAM([], []),
+                   [have_ld_version_script=yes], [have_ld_version_script=no])
+    rm -f conftest.map
+    LDFLAGS="$save_LDFLAGS"
+    AC_MSG_RESULT($have_ld_version_script)
+  fi
+  AM_CONDITIONAL(HAVE_LD_VERSION_SCRIPT, test "$have_ld_version_script" = 
"yes")
+])
diff --git a/modules/linker-script b/modules/linker-script
new file mode 100644
index 0000000..34f2075
--- /dev/null
+++ b/modules/linker-script
@@ -0,0 +1,14 @@
+Description:
+Macros to test whether LD support --linker-script.
+
+Files:
+m4/linker-script.m4
+
+configure.ac:
+gl_LINKER_SCRIPT
+
+License:
+unlimited
+
+Maintainer:
+Simon Josefsson
-- 
1.5.6.5