On Wed, 2012-06-27 at 14:09 +0300, Serge wrote: > 2012/6/25 Ben Hutchings wrote: > > >> BTW, it's interesting that Fedora/CentOS use -Wp,-D_FORTIFY_SOURCE=2 > >> and they use it in CFLAGS/CXXFLAGS. > > > > Presumably as a workaround for build systems that do not respect > > CPPFLAGS. > > I actually noticed that because it's "-Wp,-D...", not "-D...". But I guess > you're right, it's in CFLAGS because many build systems support CFLAGS, > but only autotools support CPPFLAGS. > > > GNU make's implicit rules use CPPFLAGS. If other build systems or > > overriden rules don't use it, it's a bug. This can of course be > > worked around in debian/rules. > > Well, such argument can be applied to any build system. For example: Cmake > uses CMAKE_C_FLAGS, but GNU's make does not use it. It's a bug.
GNU make is the standard build sequencing tool for the GNU system (i.e.
for Debian). CMake and the others probably ought to follow the platform
conventions.
[...]
> Talking just about autotools:
> * CPPFLAGS without CFLAGS are used only by ./configure script
> * CPPFLAGS without CFLAGS are used only for some conftests
> * -D_FORTIFY_SOURCE=2 means nothing for those tests
> * -D_FORTIFY_SOURCE=2 does nothing at all without -O2
> So even for autotools there's no reason to keep -D_FORTIFY_SOURCE=2 in
> a CPPFLAGS variable. It can be easily dropped.
[...]
I do take the point that it's not obviously useful to separate out
CPPFLAGS.
Ben.
--
Ben Hutchings
Lowery's Law:
If it jams, force it. If it breaks, it needed replacing anyway.
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