Re: [PATCH] Makerules: pass CFLAGS when building .S files, BZ #23273

[Sergei Trofimovich <slyich at gmail dot com>]

On Mon, 11 Jun 2018 15:47:41 +0200
Florian Weimer <fweimer@redhat.com> wrote:

> On 06/11/2018 03:41 PM, Sergei Trofimovich wrote:
> > The below works on unmodified glibc as well:
> > 
> > $ ../glibc/configure \
> >      --build=x86_64-pc-linux-gnu \
> >      --host=armv7a-hardfloat-linux-gnueabi \
> >      CC="armv7a-hardfloat-linux-gnueabi-gcc -march=armv7-a -mfpu=neon" \
> >      CFLAGS="-pipe -O2" \
> >      --prefix=/usr  
> 
> Then please use that instead.  It's what we do on other architectures, too.

Aha. Gentoo allows user to specify CFLAGS from a limited (but not small) set of
flags when glibc is built locally:
    https://gitweb.gentoo.org/repo/gentoo.git/tree/eclass/flag-o-matic.eclass#n25

Does it mean that canonical way to build glibc would be to always pass all
CFLAGS/CXXFLAGS as part of CC/CXX?
    CC="${TARGET_CC} ${CFLAGS}"
    CXX="${TARGET_CC} ${CXXFLAGS}"

Or should only a small subset of CFLAGS/CXXFLAGS go to CC/CXX?
    CC="${TARGET_CC} ${filtered_CFLAGS}"
    CXX="${TARGET_CC} ${filtered_CXXFLAGS}"

If it should be a filtered subset, how can we easily infer supported subset?

-- 

  Sergei

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