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prog_LDADD at the end of the linking command line

From: Benoit SIGOURE
Subject: prog_LDADD at the end of the linking command line
Date: Fri, 19 Oct 2007 18:48:25 +0200

Hello list,
[CC: Akim: that's why trunk doesn't compile on Windows/MinGW]

In a project where we use both Automake and Libtool, I have a program named `uconsole' which depends on Boost and a libtool library `libkernel.a' built in the same directory (which also depends on Boost).

Here is an excerpt from our
# Add boost libraries.

libkernel_la_SOURCES = manythings

noinst_PROGRAMS = uconsole
uconsole_SOURCES =
uconsole_LDADD =

Now the problem is that when linking `uconsole', I get undefined references because of the way `uconsole_LDADD' has been appended to the linking command line:
/bin/sh ../libtool --tag=CXX --mode=link mingw32-g++ -mthreads -I/ usr/local/include -g -O2 -pipe -L/usr/local/lib -lboost_thread-mt -o uconsole.exe console.o -lws2_32 -lgdi32 mingw32-g++ -Wno-deprecated -Wall -W -Woverloaded-virtual -Wformat - Wno-uninitialized -Werror -Wcast-align -Wcast-qual -Wwrite-strings - mthreads -IC:/cygwin/usr/local/include -g -O2 -pipe -o uconsole.exe console.o -LC:/cygwin/usr/local/lib -lboost_thread-mt ./.libs/ libkernel.a -lws2_32 -lgdi32

See, libkernel.a comes at the end whereas Boost is listed beforehand. And, as you know, the way the linker works entails that undefined references to Boost found in won't be resolved.

The generated Makefile looks like this:
        --mode=link $(CXXLD) $(AM_CXXFLAGS) $(CXXFLAGS) $(AM_LDFLAGS) \
        $(LDFLAGS) -o $@
uconsole$(EXEEXT): $(uconsole_OBJECTS) $(uconsole_DEPENDENCIES)
        @rm -f uconsole$(EXEEXT)
        $(CXXLINK) $(uconsole_OBJECTS) $(uconsole_LDADD) $(LIBS)

Have we done something wrong?  How can we get this to work?  :)
Oddly enough, the project builds fine on Linux (gcc3/gcc4), OSX (Intel/PPC) and Windows VC++, but not on Windows with MinGW! And, of course, if I manually run the link command with `libkernel.a' before `-lboost_thread-mt', it links fine.


Benoit Sigoure aka Tsuna
EPITA Research and Development Laboratory

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