Build Error about ycm-generator

[rdnetto]

Looking at the grappa repo, it appears to use cmake (indirectly, via the configure script). The problem is that once cmake generates a Makefile, that Makefile has the compiler hardcoded. YCM-Gen relies on being able to override the compiler (via the CC / CXX variables).

I think the best approach would be to eliminate the dependency on the generated makefile by converting GrappaRDD to use cmake. (I assume cmake has some native way of including other cmake files). That way it's generated with the compiler variables set correctly.

An alternative (easier) approach would be to just generate the config file for grappa, then copy it into the GrappaRDD folder with some minor changes.

[EntilZha]

I originally was using cmake for GrappaRDD, but couldn't figure out how to include the grappa.mk file which configures my code to link against Grappa. If you know how to do that, would be great since I am fairly new to make/cmake with C/C++.

I will try your second suggestion, that seems like it might work pretty easily since GrappaRDD doesn't have any external dependencies.

[rdnetto]

Based on the output of make, my guess is you could add something like this to the makefile:

LDFLAGS="-Wl,-rpath  -Wl,/usr/local/lib  -Wl,--enable-new-dtags  -L$(GRAPPA_PREFIX)/build/Make+Release/install/lib -L/usr/local/lib -L/usr/lib/x86_64-linux-gnu"
LDLIBS="-lGrappa -lglog -lgflags -lgraph500-generator -lboost_system -lboost_filesystem -Wl,-Bdynamic -lmpicxx -lmpi -lpthread -lrt"

all: main
main: main.o
main.o: RDD.hpp GrappaContext.hpp
    $(CXX) -c $(CPPFLAGS) $(CXXFLAGS)

into the Makefile.

I suggest reading the docs on implicit rules and variables, since they explain what's happening behind the scenes.

You could also just copy and paste the line from the makefile (replacing g++ with $(CXX)) but that's less maintainable.