non-recursive make & CPPFLAGS

[Ralf Corsepius <corsepiu at faw dot uni-ulm dot de>]

Hi,

Give a Makefile.am similar to this:

lib_LIBRARIES = libfoo.a
libfoo_a_SOURCES = foo/foo.c
libfoo_a_CPPFLAGS = -DFOO

lib_LIBRARIES += libbar.a
libbar_a_SOURCES = bar/bar.c
libbar_a_CPPFLAGS = -DBAR

Such Makefile.ams typically can be met when converting a recursive
sourcetree into a non-recursive.

Passing *_CPPFLAGS however causes automake to prepend the its "mangled
name" to *.o's (libfoo_a-foo.o), though they are not required.

IIRC, the rationale for introducing the "mangling" was to avoid
conflicts when compiling a single source multiple times with different
CPPFLAGS/CFLAGS flags.

This doesn't apply to the example above, were the sources are completely
separate.

Question: Is there a way to switch off this "mangling" rsp. is there a
way to set up CPPFLAGS/CFLAGS such that this "mangling" doesn't occur?

Ralf