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Re: ld-output-def

From: Simon Josefsson
Subject: Re: ld-output-def
Date: Wed, 01 Apr 2009 16:51:37 +0200
User-agent: Gnus/5.110011 (No Gnus v0.11) Emacs/23.0.90 (gnu/linux)

I pushed the following since there weren't any objections to adding the
module.  I believe the patch address most if not all comments so far.
Thanks for all the comments!  Further review is still appreciated.


>From 68f982e01be79f241a306e1dd7328fa1f307ab0c Mon Sep 17 00:00:00 2001
From: Simon Josefsson <address@hidden>
Date: Wed, 1 Apr 2009 16:49:57 +0200
Subject: [PATCH] Add lib-msvc-compat module.

 ChangeLog               |   10 +++++++
 MODULES.html.sh         |    1 +
 doc/gnulib.texi         |    3 ++
 doc/ld-output-def.texi  |   64 +++++++++++++++++++++++++++++++++++++++++++++++
 m4/ld-output-def.m4     |   29 +++++++++++++++++++++
 modules/lib-msvc-compat |   14 ++++++++++
 6 files changed, 121 insertions(+), 0 deletions(-)
 create mode 100644 doc/ld-output-def.texi
 create mode 100644 m4/ld-output-def.m4
 create mode 100644 modules/lib-msvc-compat

diff --git a/ChangeLog b/ChangeLog
index bcf192b..9c48bf7 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,15 @@
 2009-04-01  Simon Josefsson  <address@hidden>
+       * modules/lib-msvc-compat: New module.  Thanks to Bruno Haible
+       <address@hidden>, Ralf Wildenhues <address@hidden>, and
+       Eric Blake <address@hidden> for review.
+       * MODULES.html.sh: Add lib-msvc-compat.
+       * doc/gnulib.texi: Link to new section.
+       * m4/ld-output-def.m4: New file.
+       * doc/ld-output-def.texi: New file.
+2009-04-01  Simon Josefsson  <address@hidden>
        Rename ld-version-script to lib-symbol-versions.  Suggested by
        Bruno Haible <address@hidden>.
        * modules/ld-version-script: Renamed to lib-symbol-versions.
diff --git a/MODULES.html.sh b/MODULES.html.sh
index 4175895..9f6e7db 100755
--- a/MODULES.html.sh
+++ b/MODULES.html.sh
@@ -3132,6 +3132,7 @@ func_all_modules ()
   func_module include_next
   func_module ldd
   func_module lib-ignore
+  func_module lib-msvc-compat
   func_module lib-symbol-versions
   func_module link-warning
   func_module no-c++
diff --git a/doc/gnulib.texi b/doc/gnulib.texi
index 6e13cdf..02927aa 100644
--- a/doc/gnulib.texi
+++ b/doc/gnulib.texi
@@ -5823,6 +5823,7 @@ This list of functions is sorted according to the header 
that declares them.
 * Searching for Libraries::
 * Exported Symbols of Shared Libraries::
 * LD Version Scripts::
+* Visual Studio Compatibility::
 * Supporting Relocation::
 * func::
 * warnings::
@@ -5915,6 +5916,8 @@ generated automatically.
 @include ld-version-script.texi
address@hidden ld-output-def.texi
 @include relocatable-maint.texi
 @include func.texi
diff --git a/doc/ld-output-def.texi b/doc/ld-output-def.texi
new file mode 100644
index 0000000..3ad1feb
--- /dev/null
+++ b/doc/ld-output-def.texi
@@ -0,0 +1,64 @@
address@hidden Visual Studio Compatibility
address@hidden Visual Studio Compatibility
address@hidden DEF files
address@hidden LD DEF files
+The @code{lib-msvc-compat} module detects whether the linker supports
address@hidden when building a library.  That parameter is used
+to generate a DEF file for a shared library (DLL).  DEF files are
+useful for developers that use Visual Studio to develop programs that
+links to your library.  See the GNU LD manual for more information.
+There are other ways to create a DEF file, but we believe they are all
+sub-optimal to using @code{--output-def} during the build process.
+The variants we have considered include:
address@hidden @bullet
address@hidden Use DUMPBIN /EXPORTS.
+The tool does not generate DEF files directly, so its output needs to
+be post processed manually.  The tool is documented to potentially not
+work with non-MS development tools
+(@url{http://support.microsoft.com/kb/131313/en-us}), which is the
+case when MinGW is used to build the library.
address@hidden Use IMPDEF.
+There is a tool called IMPDEF
+that can generate DEF files.  However, it is not part of a standard
+Visual Studio installation.  Further, it is documented as being an
+unreliable process.
address@hidden Use DLLTOOL.
+The dlltool is part of the MinGW suite, and thus not part of a
+standard Visual Studio installation.  The documentation for the IMPDEF
+tool claims that DLLTOOL is the wrong tool for this job.  Finally,
+DLLTOOL does not generate DEF files directly, so it requires
+post-processing of the output.
address@hidden itemize
+If you are using libtool to build your shared library, here is how to
+use this module.  Import @code{lib-msvc-compat} to your project, and
+then add the following lines to the @code{Makefile.am} that builds the
+libfoo_la_LDFLAGS += -Wl,--output-def,libfoo-$(SOVERSION).def
+defexecdir = $(bindir)
+defexec_DATA = libfoo-$(SOVERSION).def
address@hidden smallexample
+The @code{SOVERSION} variable needs to be defined.  It should be the
+shared library version number used in the DLL filename.  For Windows
+targets you compute this value from the values you pass to Libtool's
address@hidden  Assuming you have variables @code{LT_CURRENT}
+and @code{LT_AGE} defined for the @code{CURRENT} and @code{AGE}
+libtool version integers, you compute @code{SOVERSION} as follows:
+SOVERSION=`expr address@hidden@} - address@hidden@}`
address@hidden smallexample
diff --git a/m4/ld-output-def.m4 b/m4/ld-output-def.m4
new file mode 100644
index 0000000..1aa6a6f
--- /dev/null
+++ b/m4/ld-output-def.m4
@@ -0,0 +1,29 @@
+# ld-output-def.m4 serial 2
+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
+# -------------
+# Check if linker supports -Wl,--output-def and define automake
+# conditional HAVE_LD_OUTPUT_DEF if it is.
+  AC_CACHE_CHECK([if gcc/ld supports -Wl,--output-def],
+    [gl_cv_ld_output_def],
+    [if test "$enable_shared" = no; then
+       gl_cv_ld_output_def="not needed, shared libraries are disabled"
+     else
+       gl_ldflags_save=$LDFLAGS
+       LDFLAGS="-Wl,--output-def,conftest.def"
+                   [gl_cv_ld_output_def=yes],
+                   [gl_cv_ld_output_def=no])
+       rm -f conftest.def
+       LDFLAGS="$gl_ldflags_save"
+     fi])
+  AM_CONDITIONAL([HAVE_LD_OUTPUT_DEF], test "x$gl_cv_ld_output_def" = "xyes")
diff --git a/modules/lib-msvc-compat b/modules/lib-msvc-compat
new file mode 100644
index 0000000..344b501
--- /dev/null
+++ b/modules/lib-msvc-compat
@@ -0,0 +1,14 @@
+Macros to test whether LD support --output-def.
+Simon Josefsson

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