CODEWITHSUNDEEP
c++ubuntugccmakefile
GilLevi
GilLevi

Reputation: 2137

g++ doesn't recognize the option -wl

I'm working on Ubuntu 12.10 with gcc version 4.7.2.

I'm trying to make the following makefile:

CC = g++
CCFLAGS = -fPIC -O3 -Wall -ffast-math -msse -msse2 -fopenmp
LINKFLAGS = -shared -Wl -fopenmp -lgomp

INPUT = im2col.cpp fastpool.cpp local_response_normalization.cpp neuron.cpp
TARGET = libcpputil.so

# If we are going to use MKL, we include additional flags
MKL_FLAGS = -D DECAF_USE_MKL
MKL_LINK_FLAGS = -lmkl_rt

all: $(INPUT)
    $(CC) -c $(CCFLAGS) $(INPUT)
    $(CC) $(LINKFLAGS) -o $(TARGET) *.o
all_mkl: $(INPUT)
    $(CC) -c $(CCFLAGS) $(MKL_FLAGS) $(INPUT)
    $(CC) $(LINKFLAGS) $(MKL_LINK_FLAGS) -o $(TARGET) *.o
speedtest_lrn: speedtest_lrn.cpp local_response_normalization.cpp
    $(CC) $(CCFLAGS) -lgomp -o speedtest_lrn speedtest_lrn.cpp local_response_normalization.cpp
clean:
    rm *.so
    rm *.o

But somehow g++ doesn't recognize the option -wl. Here's the error that I'm getting:

make -C layers/cpp/
make[1]: Entering directory `/home/ubuntu/decaf-release-master/decaf/layers/cpp'
g++ -c -fPIC -O3 -Wall -ffast-math -msse -msse2 -fopenmp im2col.cpp fastpool.cpp local_response_normalization.cpp neuron.cpp
g++ -shared -Wl -fopenmp -lgomp -o libcpputil.so *.o
g++: error: unrecognized command line option ‘-Wl’
make[1]: *** [all] Error 1
make[1]: Leaving directory `/home/ubuntu/decaf-release-master/decaf/layers/cpp'
make: *** [all] Error 2
Failed to build the C libraries; exiting

EDIT: When I try to remove the "-wl" I get:

ubuntu@ubuntu-VirtualBox:~/decaf-release-master$ python setup.py 
make -C layers/cpp/
make[1]: Entering directory `/home/ubuntu/decaf-release-master/decaf/layers/cpp'
g++ -c -fPIC -O3 -Wall -ffast-math -msse -msse2 -fopenmp im2col.cpp fastpool.cpp local_response_normalization.cpp neuron.cpp
g++ -shared -fopenmp -lgomp -o libcpputil.so *.o

make[1]: Leaving directory `/home/ubuntu/decaf-release-master/decaf/layers/cpp'
usage: setup.py [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
   or: setup.py --help [cmd1 cmd2 ...]
   or: setup.py --help-commands
   or: setup.py cmd --help

error: no commands supplied

It somehow worked when I tried it on Ubuntu 12.04 and gcc 4.7.7.

Can someone please explain what's the problem and how can I fix it?

Thanks, Gil.

Upvotes: 5

Views: 9691

Answers (1)

Ferenc Deak
Ferenc Deak

Reputation: 35458

From the manual:

-Wl,option Pass option as an option to the linker. If option contains commas, it is split into multiple options at the commas. You can use this syntax to pass an argument to the option. For example, -Wl,-Map,output.map passes -Map output.map to the linker. When using the GNU linker, you can also get the same effect with -Wl,-Map=output.map.

so, you miss the options for -Wl.

Upvotes: 5

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