[Build-common-hackers] CFLAGS_$(flavor)

Emilio Pozuelo Monfort pochu at debian.org
Thu Dec 23 23:41:36 UTC 2010

On 23/12/10 22:58, Emilio Pozuelo Monfort wrote:
> On 22/12/10 17:58, Jonas Smedegaard wrote:
>> On Sun, Dec 19, 2010 at 04:15:35AM +0100, Jonas Smedegaard wrote:
>>> On Sun, Dec 19, 2010 at 01:47:48AM +0000, Emilio Pozuelo Monfort wrote:
>>>> - Would be useful to be able to specify CFLAGS as CFLAGS_$(flavor),
>>>> the same way as we do with DEB_CONFIGURE_FLAGS_$(flavor). Probably
>>>> other variables like LDFLAGS, etc.
>>> Yes. I'll look into that.
>> Hmm - did you try already? It might actually accidentally work, due to
>> per-flavor and per-package variables being resolved the same way.
> I tried CFLAGS_udeb and it didn't work. I haven't tried CFLAGS_$(udeb)
> (where $(udeb) is libvte9-udeb), but I don't see how that would work
> since CFLAGS are for the build which is per-flavor.

I have just seen what you mean, CFLAGS_$(cdbs_curpkg) in makefile-vars.mk.in:

# Derived classes that supply the flags some other way (e.g., configure).
# should set this variable to empty.
DEB_MAKE_EXTRA_ARGS ?= CFLAGS="$(or $(CFLAGS_$(cdbs_curpkg)),$(CFLAGS))" 
CXXFLAGS="$(or $(CXXFLAGS_$(cdbs_curpkg)),$(CXXFLAGS))" CPPFLAGS="$(or 
$(CPPFLAGS_$(cdbs_curpkg)),$(CPPFLAGS))" LDFLAGS="$(or 
$(LDFLAGS_$(cdbs_curpkg)),$(LDFLAGS))" $(DEB_MAKE_PARALLEL)

They are overriden in autotools.mk.in though:

# Overriden from makefile-vars.mk.  We pass CFLAGS and friends to
# ./configure, so no need to pass them to make.
# FIXME: Restructure to allow early override

Then it just sets them to CFLAGS in autotools-vars.mk.in:

DEB_CONFIGURE_SCRIPT_ENV ?= $(call cdbs_set_nondefaultvars,CC CXX) 

It just sets it to $(CFLAGS), without looking at $(CFLAGS_$(cdbs_curpkg)), 
that's why it doesn't work for me, but doing the CFLAGS = $(if ...) works.

I don't understand how CFLAGS passed to ./configure could relate to 
$(cdbs_curpkg). As I see it, the ./configure (and make) calls (either in a 
normal package doing just one call, or with multiple flavors) are completely 
orthogonal to the packages. Can you explain how they relate and how this works?


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