GCC Compiling options syntax

Question

I am trying to gprof my program. I want a line-by-line profiling. However, I can't seem to get the syntax right. I am using "make" and not "gcc" so please help only with suggestions that fit make. I wouldbe very grateful if you can give me the full "make" syntax. Based on this website: http://sourceware.org/binutils/docs/gprof/Output-Options.html[^] http://sourceware.org/binutils/docs/gprof/Line_002dby_002dline.html[^] Here is what I am inputting:

make USE_LOCAL_HEADERS=0 LDFLAGS='-L.' BASE_CFLAGS=-m32 CFLAGS='-fopenmp -pg -l -g'

The output is:

/usr/bin/ld: cannot find -l-g
collect2: ld returned 1 exit status
make[2]: *** [build/release-linux-ppc64/ioquake3.ppc64] Error 1
make[2]: Leaving directory `/r/home7/yasir/minoru/cfe2/yasirTemp/ioquake3dev/svfb_201110271440/ioquake3dev_clean'
make[1]: *** [targets] Error 2
make[1]: Leaving directory `/r/home7/yasir/minoru/cfe2/yasirTemp/ioquake3dev/svfb_201110271440/ioquake3dev_clean'
make: *** [release] Error 2

I need option "-l", "-g" and "-pg".

Answer 1

-pg enables profiling, -g includes symbol names which help interpreting the profile generated.

The -pg option needs to be passed to compiler and linker.

The -l command does not make sense in the way you are using it, as it needs a library name as parameter, so as long as you do not provide one, leave the -l away.

Also during development I'd recommend the -Wall option to enable all warnings during compilation.

So you might try this make command:

make USE_LOCAL_HEADERS=0 LDFLAGS='-L. -pg' BASE_CFLAGS=-m32 CFLAGS='-fopenmp -pg -g -Wall'

Answer 2

You can pass most of those as environment variables, make "should" do the right thing and use them for the compiler:

$ USE_LOCAL_HEADERS=0 \
LDFLAGS='-L.' \
BASE_CFLAGS=-m32 \
CFLAGS='-fopenmp -pg -g' \
make

That will USE_LOCAL_HEADERS, LDFLAGS, BASE_CFLAGS and CFLAGS as environment variables which make and gcc can see. You may have to edit your Makefile to combine them in the correct ways for what you want.

Answer 3

make is simply a "to determine automatically which pieces of a large program need to be recompiled, and issue the commands to recompile them" (man make). It looks like make cannot make sense of your arguments; it doesn't actually get to run any commands before it encounters an error.

I'm sorry I can't help you any further, but your problem is within your make file or similar. You should read up on what a make file is, and how to gprof your program and understand the difference between make and gcc, and reevaluate what you are trying to do. Make may not be useuful to you.