Question

Static library in a Makefile

Asked by: rfr1tz

Hi,

I'm working on a program that has a Makefile that contains the following section:

//------------
# Make command to use for dependencies
MAKE=gmake

# If no configuration is specified, "Debug" will be used
ifndef "CFG"
CFG=Debug
endif

#
# Configuration: Debug
#
ifeq "$(CFG)" "Debug"
OUTDIR=Debug
OUTFILE=$(OUTDIR)/Mastester
CFG_INC=-I../../../Code/.../include/ \
      -I../../../Code/.../include/ -I../../../Code/.../ \
      -I../../../Code/.../include/ \
      -I../../../Code/.../include/
CFG_LIB=
CFG_OBJ=
COMMON_OBJ=$(OUTDIR)/file1.o $(OUTDIR)/file2.o \
      $(OUTDIR)/file3.o /* And a lot more */
 
OBJ=$(COMMON_OBJ) $(CFG_OBJ)

COMPILE=g++ -c  -x c++  -O0 -g -o "$(OUTDIR)/$(*F).o" $(CFG_INC) "$<" -DLINUX -DPOSIX -pthread
LINK=g++  -O0 -g -o "$(OUTFILE)" $(OBJ) $(CFG_LIB)
//--------------

This program needs 4 static libraries, say x1.a, x2.a, x3.a, x4.a

I've tried to update this Makefile to add these libraries but it doesn't work (the linker does not see the libraries)
I've tried many ways, one of them is:

//--------------
CFG_LIB= -L/home/.../libdir -lx1, -lx2, -lx3, -lx4
(all the libraries, i.e. x#.a, are physically stored in /home/.../libdir
//--------------

but none of them seems to work.

If you know how update this Makefile to make the linker (g++) see these libraries during the linking, please help.

Thanks a lot,

Rfr1tz

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Asked On
2004-07-20 at 12:48:13ID21065317
Tags

makefile

,

static

,

library

Topic

Linux Programming

Participating Experts
1
Points
250
Comments
3

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Answers

 

by: de2ZotjesPosted on 2004-07-20 at 14:04:52ID: 11597498

If I take a quick look at the g++ compiler you need to "wrap" the options for the linker :

 -Wl,<options>            Pass comma-separated <options> on to the linker

so your CFG_LIB should be preceded by a -Wl,

 

by: rfr1tzPosted on 2004-07-20 at 14:30:32ID: 11597694

Hi de2Zotjes,

Thanks a lot for your reply.
May you give me more details about what you mentioned about. If you can give me an example, that will be very helpful for me.

Thanks,

Rfr1tz

 

by: de2ZotjesPosted on 2004-07-20 at 14:55:30ID: 11597886

In your Makefile you have a line specifying the linker:

LINK=g++ -O0 -g -o "$(OUTFILE)" $(OBJ) $(CFG_LIB)

adapt that line to look like this:

LINK=g++ -O0 -g -o "$(OUTFILE)" $(OBJ) -Wl,$(CFG_LIB)

make sure that CFG_LIB contains valid info:
CFG_LIB= -L/home/.../libdir -lx1, -lx2, -lx3, -lx4

should work.

20120131-EE-VQP-002

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