On Sun, 29 Mar 2009, Charles Wilson wrote:
* libltdl/m4/libtool.m4 (_LT_LINKER_SHLIBS) [cygwin*|mingw*|pw32*|cegcc*]:
Define export_dynamic_flag_spec as -Wl,--export-all-symbols, as required
by GNU ld for PE-COFF.
Original patch by Yaakov Selkowitz. As he explained:
On Cygwin, the --export-all-symbols linker flag is required;
--export-dynamic has no effect
(see http://sourceware.org/bugzilla/show_bug.cgi?id=6744).
This patch fixes two problems:
(1) LT_SYS_DLOPEN_SELF returns a false negative;
(2) Using the -export-dynamic libtool flag does not affect the
resulting binary.
Tested in combination with several other cygwin patches, as part of the
recent cygwin official 2.2.7a-N libtool release(s):
http://cygwin.com/ml/cygwin-announce/2009-03/msg00080.html
http://cygwin.com/ml/cygwin-announce/2009-03/msg00081.html
No regressions. Okay to push?
If you are sure that --export-all-symbols will work with older (within
reason) Cygwin and MinGW installs, then this seems ok to push. I do
see support for --export-all-symbols in my archaic MinGW install so
the risk of problems seems low.
Bob
libltdl/m4/libtool.m4 |1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/libltdl/m4/libtool.m4 b/libltdl/m4/libtool.m4
index 477f6e3..15612c0 100644
--- a/libltdl/m4/libtool.m4
+++ b/libltdl/m4/libtool.m4
@@ -4275,6 +4275,7 @@ _LT_EOF
# _LT_TAGVAR(hardcode_libdir_flag_spec, $1) is actually meaningless,
# as there is no search path for DLLs.
_LT_TAGVAR(hardcode_libdir_flag_spec, $1)='-L$libdir'
+ _LT_TAGVAR(export_dynamic_flag_spec, $1)='${wl}--export-all-symbols'
_LT_TAGVAR(allow_undefined_flag, $1)=unsupported
_LT_TAGVAR(always_export_symbols, $1)=no
_LT_TAGVAR(enable_shared_with_static_runtimes, $1)=yes
--
1.6.1.2
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,http://www.GraphicsMagick.org/
