On 07/18/2013 06:20 AM, Earnie Boyd wrote: > On Thu, Jul 18, 2013 at 8:08 AM, Eric Blake wrote: >> On 07/18/2013 03:36 AM, Miguel Guedes wrote: >>> Hello, >>> >>> >>> I am using AC_LANG_PROGRAM to test for libboost_system and it invokes >>> gcc/g++ in the following way: >>> >>> configure:3975: g++ -o conftest -g -O2 -lboost_system conftest.cpp >>> >>> The above results in a few errors and doesn't link even though the >>> library in question is present in the system. This is because the >>> source file should be at the front in the call to g++, e.g.: >>> >>> g++ conftest.cpp -o conftest -g -O2 -lboost_system >> >> That's probably because you put -lboost_system into LDFLAGS instead of >> the proper LIBS (LDFLAGS is for -L/path, LIBS for -llib). > > That answer is still problematic since I need -L/path to instruct > where to find my -llib. I.E. LDFLAGS value need to be specified before > LIB value for the test. AC_LANG_PROGRAM tests (roughly): $CC -o conftest $CFLAGS $LDFLAGS conftest.cpp $LIBS which does precisely what you want, if you stick -L in LDFLAGS and -l in LIBS. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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