Make compiling *.S CPPFLAGS aware

[Ralf Corsepius]

Hi,

I'd like to propose the patch below, which  
* splits handling of *.s (asm) and *.S (preprocessed asm) into 2
separated rule sets.
* makes handling of *.S-files aware of CPPFLAGS (Similar to gmake's
behavior), AM_CPPFLAGS and *_CPPFLAGS.

Background: I have libraries which consist of *.c + *.S files and
require custom CPPFLAGS:
...
lib_LIBRARIES = libfoo.a
libfoo_a_SOURCES = foo.c bar.S
libfoo_a_CPPFLAGS = -DOPTIMIZE
...
lib_LIBRARIES += libfoo_g.a
libfoo_g_a_SOURCES = $(libfoo_a_SOURCES)
libfoo_g_a_CPPFLAGS = -DDEBUG
...

An unmodified automake generates Makefile rules to build
libfoo_a-foo.o + bar.o  and libfoo_g_a-foo.o + bar.o, which share bar.o
for both libraries. Using customized *_CCASFLAGS, it would be possible
to make *.S-compilation rules CPPFLAGS-aware, but doesn't help wrt. to
the file-names.

With this patch, automake generates Makefile rules for
libfoo_a-foo.o + libfoo_a-bar.o  and
libfoo_g_a-foo.o + libfoo_g_a-bar.o,
with *-bar.o being compiled with the appropriate CPPFLAGS.

Ralf

automake-1.8-rc-20040110-1.diff
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