jeremy@eik.ii.uib.no (Jeremy Cook) (11/30/90)
I thought why not try to get shared libraries working with motif (motif
1.1 on SPARCStation running SunOS4.1). Well I managed to get it to work
but need some help to get it to be totally user transparent. Carry out the
following:
o patch lib/Xm/Imakefile to generate shared library targets using the
following diff
*** Imakefile.orig Tue Nov 20 12:10:29 1990
--- Imakefile Tue Nov 20 12:34:16 1990
***************
*** 180,186 ****
--- 180,195 ----
OBJS = $(OBJS1) $(OBJS2)
+ /* Trying with shared libraries -- JMC 20/11-90 */
+ /* (using Xt's rev) */
+ #if SharedLibXt
+ SharedLibraryObjectRule()
+ NormalSharedLibraryTarget(Xm,$(SOXTREV),$(OBJS))
+ InstallSharedLibrary(Xm,$(SOXTREV),$(USRLIBDIR))
+ #else
NormalLibraryObjectRule()
+ #endif
+
NormalLibraryTarget(Xm,$(OBJS))
LintLibraryTarget(Xm,$(SRCS))
(Note that I didn't bother making a special version number for Xm, I used
Xt's)
o build all the object files:
make Makefile ; make
o After a very long time this halts with the following text:
rm -f libXm.so.4.0~
(cd shared; ld -o ../libXm.so.4.0~ -assert pure-text ArrowB.o ArrowBG.o
ArrowB
I.o BulletinB.o CascadeB.o CascadeBG.o Command.o CutPaste.o
DialogS.o Dra
wingA.o DrawnB.o FileSB.o Form.o Frame.o Gadget.o GadgetUtil.o
GeoUtil
s.o HeapMgr.o ImageCache.o Label.o LabelG.o List.o MainW.o
MapEvents.o M
enuShell.o MenuUtil.o MessageB.o NavigMap.o PanedW.o PushB.o
PushBG.o Read
Image.o ResConvert.o ResInd.o RowColumn.o Sash.o Scale.o
ScrollBar.o S
crolledW.o SelectioB.o SeparatoG.o Separator.o Simple.o Text.o
TextIn.o T
extOut.o TextStrSrc.o ToggleB.o ToggleBG.o ToggleBI.o UniqueEvnt.o
VaSimpl
e.o Visual.o XmString.o TextF.o AtomMgr.o Cache.o GetSecRes.o TrackLoc.o
Protocols.o Primitive.o Manager.o Traversal.o Dest.o Vendor.o
VendorE.o E
xtObject.o BaseClass.o VirtKeys.o Desktop.o)
ld: GLOBAL_OFFSET_TABLE overflown: need to use -PIC
*** Error code 4
make: Fatal error: Command failed for target `libXm.so.4.0'
o I do not know what 'GLOBAL_OFFSET_TABLE overflown' really means but I
get the impression that some internal limit is being exceeded and ld
refuses to behave ("need to use -PIC" is merely a red herring).
o It is however a simple matter to manually build *two* libraries instead:
cd shared
ld -o libXm-a.so.4.0 -assert pure-text [A-R]*.o
ld -o libXm-b.so.4.0 -assert pure-text [S-Z]*.o
o This builds two shared libraries of about 0.5Mbytes each and ld is
happy. Copying these to the appropriate dir and linking your application
using -lXm-a -lXm-b *instead* of -lXm means that your application will now
use shared motif libraries!
ldd application
-lXm-a.4 => /lib/libXm-a.so.4.0
-lXm-b.4 => /lib/libXm-b.so.4.0
-lXt.4 => /lib/libXt.so.4.0
-lX11.4 => /lib/libX11.so.4.3
-lc.1 => /lib/libc.so.1.5
strip application
ls -l application
-rwxr-xr-x 1 jeremy 24576 Nov 21 10:59 application
o It seems to work ok, but I have only tested with relatively simple
applications. It could break at any moment. It would be useful if someone
can tell me how to build a BIG shared library out of the two pieces that I
have, I would be most grateful.
Jeremy Cook
email : jeremy@eik.ii.uib.no