Bad LD_LIBRARY_PATH set in the libtool wrapper

[Sam Varshavchik]

My source tree builds two libraries, from two separate directories in the  
source tree.

libxtls.la gets linked against libx.la in a different directory, as well as  
some system libraries in /usr/local/lib. Makefile.am declares thusly:

libxtls_la_LIBADD=../base/libx.la
libxtls_la_LDFLAGS=-version-info 1 $(GNUTLS_LIBS) $(GCRYPT_LIBS) -lpthread

These macros expand to a search path that includes /usr/local/lib. In  
libxtls.la I end up with this (leaving out some unrelated stuff):

dependency_libs="-R/usr/local/lib -L/usr/local/lib  
[SOURCETREEPATH]/base/libx.la"

I then build an executable named "testuseragent_shared" that gets linked  
against libxtls.la:

testuseragent_shared_SOURCES=testuseragent.C
testuseragent_shared_LDADD=libxtls.la

> From this, libtool produces a wrapper for testuseragent_shared in the source  
tree, that reads as follows (linewrapped):
    
LD_LIBRARY_PATH="[CURRENTDIR]/.libs:/usr/local/lib: 
[SOURCETREEPATH]/base/.libs:$LD_LIBRARY_PATH"

The search path places /usr/local/lib ahead of …/base/.libs, for libx.so.1.  
It obviously gets it from libxtls_la_LDFLAGS.

The problem here is when I already have a previously installed, older  
libx.so.1 build in /usr/local/lib, and I run testuseragent_shared from the  
source tree, it ends up loading the older libx.so.1 from /usr/local/lib,  
rather than the one that also gets built in the source tree. Hilarity ensues.

Yes, I know about -static, and I also produce a testuseragent_static linked  
with -static, that works splendidly from the source tree. But I'd really  
like to have a dynamically-linked testuseragent_shared and run it from the  
source tree, with the wrapper's help, for regression testing purposes.

I must be doing something fundamentally wrong here, but I can't figure it  
out. The more I think about it, the more I'm leaning towards thinking that  
libtool should always put source tree paths ahead of any system paths, in  
the wrapper. This is libtool 2.4.

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