Autotools: creating a static library from differently compiled sources

Question

I am trying to build a static library from several sources. The problem is that for some sources I have to use different CFLAGS.

In the beginning I thought about creating several noinst_LIBRARIES and finally combine them to one in lib_LIBRARIES using LIBADD. This approach fails because there is no way to combine static libraries using ar without extracting them.

This is how my Makefile.am currently looks:

noinst_LIBRARIES = lib1.a lib2.a
lib_LIBRARIES = final.a

final_a_CFLAGS = -Werror
final_a_SOURCES = mainlib/src.c
final_a_LIBADD = lib1.a lib2.a

lib1_a_CFLAGS = -O0
lib1_a_SOURCES = lib1/src11.c lib1/src12.c

lib2_a_CFLAGS = -O3
lib2_a_SOURCES = lib2/src21.c

I have already thought about substituting AR with an ar wrapper that will first extract the libraries and then combine them in the final.a. But I do not like this approach, so is there a correct way to achieve this?

Answer 1

You probably want convenience libraries. They are documented in the manual.