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* libtool.m4: Third time lucky, with Tor's patch.

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Olly Betts 1999-10-28 20:18:15 +00:00 committed by Gary V. Vaughan
parent 861e305993
commit 524e55494a
3 changed files with 111 additions and 1 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
1999-10-28 Olly Betts <olly@muscat.co.uk>
* libtool.m4: Third time lucky, with Tor's patch.
1999-10-19 Tor Lillqvist <tml@iki.fi>
* libtool.m4: these was a missing `*' in the -mno-cygwin

1
libtool.m4 vendored
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@ -152,7 +152,6 @@ ifdef([AC_PROVIDE_AC_LIBTOOL_WIN32_DLL],
DllMain (0, 0, 0);],
[lt_cv_need_dllmain=yes],[lt_cv_need_dllmain=no])])
case $host in
case "$host/$CC" in
*-*-cygwin*/gcc*-mno-cygwin*|*-*-mingw*)
# old mingw systems require "-dll" to link a DLL, while more recent ones

107
mail/cygwin32
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@ -93,3 +93,110 @@ symbol in the shared library, and Windows DLLs do not.
Ian
When libtool links DLLs, it strips some command line switches. It's probably
the case that this is ok for most situations. However, this potentially breaks
Mingw32 support in the Cygwin environment.
In order to get Mingw32 support in Cygwin, the compiler must be invoked with
the -mno-cygwin switch. If libtool strips this switch out during the link
process, the resulting binary will get linked with the wrong import libraries.
The following is a small example. I've edited the output a bit for
readability. When I send this email, long lines will get broken up, so it
still might be a bit difficult to read.
-------------------------
$ libtool --version
ltmain.sh (GNU libtool) 1.3.3 (1.385.2.181 1999/07/02 15:49:11)
$ cat xx.c
extern __declspec(dllexport) int func(void);
int func()
{
}
$ libtool --mode=compile gcc -mno-cygwin -c xx.c
mkdir .libs
gcc -mno-cygwin -c -DPIC xx.c -o .libs/xx.lo
mv -f .libs/xx.lo xx.o
ln -s xx.o xx.lo
$ libtool --mode=link gcc -mno-cygwin -o libxx.la xx.lo \
-version-info 0:0:0 -no-undefined -rpath /usr/local/lib
rm -fr .libs/libxx.la .libs/libxx.* .libs/libxx.*
generating symbol list for `libxx.la'
test -f .libs/libxx-0-0-0.dll-ltdll.c || sed -e "/^# \/\* ltdll\.c starts here
\*\//,/^# \/\* ltdll.c ends here \*\// { s/^# //; p; }" -e d <
/usr/local/bin/libtool > .libs/libxx-0-0-0.dll-ltdll.c
test -f .libs/libxx-0-0-0.dll-ltdll.o || (cd .libs && gcc -c
libxx-0-0-0.dll-ltdll.c)
dlltool --export-all --exclude-symbols
DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12 --output-def
.libs/libxx-0-0-0.dll-def .libs/libxx-0-0-0.dll-ltdll.o xx.o
sed -e "1,/EXPORTS/d" -e "s/ @ [0-9]* ; *//" < .libs/libxx-0-0-0.dll-def >
.libs/libxx.exp
echo EXPORTS > .libs/libxx-0-0-0.dll-def
_lt_hint=1; for symbol in `cat .libs/libxx.exp`; do echo " $symbol @
$_lt_hint; " >> .libs/libxx-0-0-0.dll-def; _lt_hint=`expr 1 + $_lt_hint`; done
test -f .libs/libxx-0-0-0.dll-ltdll.c || sed -e "/^# \/\* ltdll\.c starts
here\*\//,/^# \/\* ltdll.c ends here \*\// { s/^# //; p; }" -e d <
/usr/local/bin/libtool > .libs/libxx-0-0-0.dll-ltdll.c
test -f .libs/libxx-0-0-0.dll-ltdll.o || (cd .libs && gcc -c
libxx-0-0-0.dll-ltdll.c)
gcc -Wl,--base-file,.libs/libxx-0-0-0.dll-base -Wl,--dll -nostartfiles -Wl,-e,
__cygwin_dll_entry@12 -o .libs/libxx-0-0-0.dll .libs/libxx-0-0-0.dll-ltdll.o
xx.o
dlltool --as=as --dllname libxx-0-0-0.dll --exclude-symbols
DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12 --def
.libs/libxx-0-0-0.dll-def --base-file .libs/libxx-0-0-0.dll-base --output-exp
.libs/libxx-0-0-0.dll-exp
gcc -Wl,--base-file,.libs/libxx-0-0-0.dll-base
.libs/libxx-0-0-0.dll-exp -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12
-o .libs/libxx-0-0-0.dll .libs/libxx-0-0-0.dll-ltdll.o xx.o
dlltool --as=as --dllname libxx-0-0-0.dll --exclude-symbols
DllMain@12,_cygwin_dll_entry@12,_cygwin_noncygwin_dll_entry@12 --def
.libs/libxx-0-0-0.dll-def --base-file .libs/libxx-0-0-0.dll-base --output-exp
.libs/libxx-0-0-0.dll-exp
gcc
.libs/libxx-0-0-0.dll-exp -Wl,--dll -nostartfiles -Wl,-e,__cygwin_dll_entry@12
-o .libs/libxx-0-0-0.dll .libs/libxx-0-0-0.dll-ltdll.o xx.o
(cd .libs && rm -f libxx.a && ln -s libxx-0-0-0.dll libxx.a)
dlltool --as=as --dllname libxx-0-0-0.dll --def
.libs/libxx-0-0-0.dll-def --output-lib .libs/libxx.a
creating libxx.la
(cd .libs && rm -f libxx.la && ln -s ../libxx.la libxx.la)
---------------
Notice how the 'gcc' lines do not contain the -mno-cygwin switch. This switch
should not get stripped.
Jon Leichter
jon@symas.com