Link error: cannot find -lgc

[elliottslaughter]

When I build my application with the newest master branch, I get the following link error:

x10c++  -x10rt mpi -O3 -NO_CHECKS TaskBench.x10 -post "# -o main #  -std=c++11 -I../core #  -L../core -lcore_s"
x10c++: Failed to copy core.h from to /global/u1/s/slaughte/task-bench/x10/
x10c++: /usr/bin/ld: cannot find -lgc    
     collect2: error: ld returned 1 exit status    
x10c++: Non-zero return code: 1
2 errors.

Reverting my copy of x10 to commit 9212dc271c8bcba805c82114617d47506747ee3a appears to fix the problem. Maybe the BDWGC upgrade is responsible?

[dgrove-oss]

Sorry for the slow response; been overloaded for a while.

Couple of thoughts.

1. Does it work if you compile a trivial program (eg HelloWorld.x10) without an explict -post command to x10c++?
2. Can you take a look to see if libgc.so was correctly built in x10.runtime/src-cpp/bdwgc-8.0.2/install/lib/ and verify that it was correctly copied to x10.dist/lib/

[elliottslaughter]

1. Yes, it compiles.

2. Here's what I see:

   $ ls deps/x10/x10/x10.runtime/src-cpp/bdwgc-8.0.2/install/lib 
   libcord.la  libcord.so  libcord.so.1  libcord.so.1.4.0  libgc.la  libgc.so  libgc.so.1  libgc.so.1.4.2  pkgconfig
   $ ls deps/x10/x10/x10.dist/lib 
   RunJava.jar                           commons-math3-3.6.1.jar  hazelcast-client-3.11.1.jar  libgc.so.1.4.2      lpg.jar          x10doc.jar
   antlr-runtime_4.5.0.201505151407.jar  ecj-4.10.jar             libgc.so                     libx10rt_mpi.a      snappy-java.jar
   commons-logging-1.2.jar               hazelcast-3.11.1.jar     libgc.so.1                   logging.properties  x10c.jar

   Looks like the libgc.la isn't getting copied? I think the C++ compiler on this system is configured to specify -static by default.

[elliottslaughter]

I went back to the old commit that worked, and it turns out the difference is that the static library extension changed from .a to .la. I'm guessing your build process is set to copy all .a files but hasn't been adapted to copy .la.

[elliottslaughter]

I may be wrong about the usage of .la, looks like it's associated with libtool. Anyway, the old build had .a and no .la and the new had .la but no .a. Perhaps the static library isn't being built at all? Could be a configure flag that needs to be set.