Re: SONAME clarification

[Marco Atzeri]

--- "John W. Eaton" <address@hidden> ha scritto:

> On 29-Jan-2009, Marco Atzeri wrote:
> | 
> | Hi John,
> | thanks for the effort, however
> | something is not as expected on cygwin
> |  
> | $ file lib*       
> | 
> | libcruft.so:         PE32 executable for MS
> Windows
> | (DLL) (console) Intel 80386 32-bit
> | libcruft.so.3.1.51+: symbolic link to
> `libcruft.so'
> | liblibcruftso:       current ar archive
> | 
> | I will try to investigate why I have "so" instead
> of
> | "dll".
> | For the last "liblibcruftso" SONAME does not work 
> | if $(basename) is already "libcruft"
> | 
> |
>
SONAME_FLAGS='-Wl,--out-implib=$(SHLLIBPRE)$(basename
> | $@)$(SHLLIB)'
> | 
> | should it be something like
> | SONAME_FLAGS='-Wl,--out-implib=$(patsubst
> | lib,$(SHLBINPRE)%,$@).$(SHLLIB)'
> 
> The missing . is definitely a mistake.
> 
> I see now that the use of $(basename) is also wrong.
> 
> The $(SONAME_FLAGS) variable is used in rules like
> 
>   $(SHLLIBPRE)cruft.$(SHLEXT): $(CRUFT_PICOBJ)
>           rm -f $@
>           $(SH_LD) $(SH_LDFLAGS) $(SONAME_FLAGS) -o
> $@ $^ $(LINK_DEPS)
> 
> So "$@" is "$(SHLLIBPRE)cruft.$(SHLEXT)".
> 
> You'll have to tell me what is the right conversion.
>  I don't really
> understand what the argument to --out-implib is
> supposed to be.
> 
> jwe
> 
Hi John, 
the Cywin reference is here
http://cygwin.com/cygwin-ug-net/dll.html#dll-build

gcc -shared -o cyg${module}.dll \
    -Wl,--out-implib=lib${module}.dll.a \
    -Wl,--export-all-symbols \
    -Wl,--enable-auto-import \
    -Wl,--whole-archive ${old_libs} \
    -Wl,--no-whole-archive ${dependency_libs}

while for mingw the convention is

gcc -shared -o lib${module}.dll \
    -Wl,--out-implib=lib${module}.dll.a \
....

Attached an additional patch, to amend yours.
Now I have the right call

g++ -shared -Wl,--export-all-symbols
-Wl,--enable-auto-import -Wl,--enable-auto-image-base 
-Wl,--out-implib=libcruft.dll.a -o cygcruft.dll ....

and files

libcruft.dll.a:         current ar archive
cygcruft.dll:           PE32 executable for MS Windows
(DLL) (console) Intel 80386 32-bit
cygcruft.dll.a.3.1.51+: symbolic link to `cygcruft.dll

Two additional notes:

1 )I can not test mingw so somemone else should verify
that the mingw portion is correct

2) I am blocked by this problem

http://www-old.cae.wisc.edu/pipermail/octave-maintainers/2008-December/009785.html

so my build is incomplete and 
I can not check if the remaing of your patch is 
fine for the install phase.  

Best Regards
Marco



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--- octave/configure.in 2009-01-29 15:01:04.584798000 +0100
+++ octave_local/configure.in   2009-01-30 15:25:02.211338500 +0100
@@ -1240,13 +1240,19 @@
     case "$canonical_host_type" in
       *-*-cygwin*)
         LIBPRE=cyg
-       SHLLIBPRE=lib
-        SHLBINPRE=cyg
+       SHLLIBPRE=cyg
+        SHLBINPRE=lib
       ;;
     esac
+    SHLEXT=dll
+    SHLLIB=dll.a
+    SHLBIN=a    
+    SHLEXT_VER='$(SHLEXT).$(version)'
+    SHLLIB_VER='$(SHLLIB).$(version)'
+    SHLBIN_VER='$(SHLBIN).$(version)'
     DL_LDFLAGS="-shared -Wl,--export-all-symbols -Wl,--enable-auto-import 
-Wl,--enable-runtime-pseudo-reloc"
     SH_LDFLAGS="-shared -Wl,--export-all-symbols -Wl,--enable-auto-import 
-Wl,--enable-auto-image-base"
-    SONAME_FLAGS='-Wl,--out-implib=$(SHLLIBPRE)$(basename $@)$(SHLLIB)'
+    SONAME_FLAGS='-Wl,--out-implib=$(patsubst 
$(SHLLIBPRE)%,$(SHLBINPRE)%,$@).a'
   ;;
 
   *-*-msdosmsvc)