[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Gmake: Implicit rule for archives and variable as prerequisit

From: Pascal MALAISE
Subject: Gmake: Implicit rule for archives and variable as prerequisit
Date: Thu, 07 Apr 2005 22:28:13 +0200
User-agent: Mozilla Thunderbird 0.8 (X11/20041012)


I am using a "generic" makefile defining implicit rules so that it can be included by several makefiles in several directories.
I have a problem for generating archives (.a and .so).

Here is the makefile in the target dir. The idea is to define the list of archives and, for each archive, the list of objects to store in it.
# Example of makefile
LIBS := lib

OBJS_lib := test.o

# Generic makefile for use in several projects
.SUFFIXES : .c .o .a
.PHONY : all

ALIBS  := $(LIBS:%=%.a)

%.o : %.c
        touch $@

%.a :
        ar crvs $@ $(OBJS_$(@F:%.a=%))

all : $(ALIBS)

This can be tested after creating a dummy test.c, then calling make
ar crvs lib.a test.o
ar: test.o: No such file or directory

The only solution I have found is to append (after the include) in each makefile:
lib.a : $(OBJS_lib)
Then, "make" knows that for lib.a and %.a implicit rule, test_x.o is a prerequisit. I would like to move this explicit definition that "lib.a" needs $(OBJS_lib), in the implicit part of the scheme.

I have tried %.a : $(OBJS_$(@F:%.a=%)) in the implicit rule but this does not work because: "Note that expansion using `%' in pattern rules occurs after any variable or function expansions", so @F expands probably to "%a".

Is there a nice way to write an implicite rule for an archive, using a variable for defining the list of prerequisits? Or is there a different way (using archive features from ยง11) to solve this problem?

Thank's in advance

reply via email to

[Prev in Thread] Current Thread [Next in Thread]