[Uim-bugs] [Bug 40385] New: uim-pref-qt4: failed to link with ld --as-needed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=40385

           Summary: uim-pref-qt4: failed to link with ld --as-needed
           Product: UIM
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: minor
          Priority: medium
         Component: helper: pref
        AssignedTo: uim-bugs at freedesktop.org
        ReportedBy: d+bugzilla at vdr.jp


Created an attachment (id=50582)
 View: https://bugs.freedesktop.org/attachment.cgi?id=50582
 Review: https://bugs.freedesktop.org/review?bug=40385&attachment=50582

fix build with ld --as-needed

[ this is forwarded from http://bugs.debian.org/639320 ]
[ patch created by Julian Taylor <jtaylor.debian at googlemail.com> ]

the package uim fails to build when using the linker flag --as-needed
This is caused by the library libuim placed before the static 
libuim-counted-init library which needs its symbols.
ld will then drop libuim as it appears not needed.

attached patch fixes this by adding libuim again behind libuim-counted-init

------------------------------------------------------------------------------
* failed to link with ld --as-needed

% g++ -m64 -Wl,-O1 -Wl,--as-needed -o uim-pref-qt4 customwidgets.o qt4.o
moc_customwidgets.o moc_qt4.o    -L/usr/src/uim/uim -L/usr/src/uim/replace
-L/usr/src/uim/replace/.libs -L/usr/src/uim/uim/.libs -L/usr/lib -lreplace
-luim -luim-scm -luim-x-util -luim-custom -luim-counted-init -lQtGui -lQtCore
-lpthread
/usr/bin/ld:
/usr/src/uim/uim/.libs/libuim-counted-init.a(libuim_counted_init_la-counted-init.o):
undefined reference to symbol 'uim_init'
/usr/bin/ld: note: 'uim_init' is defined in DSO
/usr/src/uim/uim/.libs/libuim.so so try adding it to the linker command line
/usr/src/uim/uim/.libs/libuim.so: could not read symbols: Invalid operation
collect2: ld returned 1 exit status
%

------------------------------------------------------------------------------
* succeeded to link with ld --as-needed (added -luim behind -luim-counted-init)

% g++ -m64 -Wl,-O1 -Wl,--as-needed -o uim-pref-qt4 customwidgets.o qt4.o
moc_customwidgets.o moc_qt4.o    -L/usr/src/uim/uim -L/usr/src/uim/replace
-L/usr/src/uim/replace/.libs -L/usr/src/uim/uim/.libs -L/usr/lib -lreplace
-luim -luim-scm -luim-x-util -luim-custom -luim-counted-init -luim -lQtGui
-lQtCore -lpthread
%

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