Shared libraries with Motif 1.1 works (almo

[Jeremy Cook]

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 at eik.ii.uib.no