On 03/09/2013 04:43 PM, Michele Martone wrote: > Hi, > > I'm using the "Per-Object Flags Emulation" functionality of automake > to build a single library (.a) file from two .a files, each made of .o > files compiled with different flags. > > In order to apply the example of > > http://www.gnu.org/software/automake/manual/automake.html#Per_002dObject-Flags > > in my Makefile.am, I declare something similar to > libfoo_a_CFLAGS = -some -other -flags > expecting that libfoo.a will be compiled with -some -other -flags > rather than CFLAGS. > > However in the resulting Makefile I see that something like the > following: > libfoo_a-foo.o: foo.c > $(CC) ... $(libfoo_a_CFLAGS) $(CFLAGS) ... > is being generated instead. > In other words, CFLAGS is not being replaced by libfoo_a_CFLAGS: only > prepended: > This is correct: CFLAGS is a user-reserved variable, so it should always be honoured and should never be overridden by Automake rules (nor by package developers). The correct developer-reserved variable to specify extra C compilation flags is AM_CFLAGS -- and *that* is being correctly overwritten.
> this does not seem neither what the documentation says nor > what I need. > > Am I doing something wrong ? > If you are defining CFLAGS in your Makefile.am, yes. Use AM_CFLAGS instead. HTH, Stefano
