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xen-devel
Re: [Xen-devel] Inheriting CFLAGS
No, I do not have those lines in my Rules.mk file. It was downloaded
this morning using the ebuild, so was the xen-2.0.tgz file from
sourceforge. If I add -nopie to the CFLAGS in Rules.mk file xen will
compile fine, however if I add -nopie to my environment CFLAGS it does
not get picked up by the xen build script. Therefore I can compile and
install it, but it takes manual intervention, which defeats the idea of
using an ebuild :)
I am not looking of inheriting CFLAGS into the kernel build process - I
agree that it is bad. However I am unable to build Xen-2.0 itself with
my compiler. Unfortunately, unlike with GCC 3.4, it doesn't compile a
non-SSP/PIE version of gcc to use. (I'm running gcc 3.3.4)
Keir Fraser wrote:
I am attempting to install Xen-2.0 using the Gentoo Ebuilds written by Philip
Taylor, and have run into the same problem as A Streecar Named with needing to
implement the -nopie flag.
strange, I didn't have to do it (using ebuilds from
http://bugs.gentoo.org/show_bug.cgi?id=70161)
Yes, I did wonder about this.
Can you take a look in xen/arch/x86/Rules.mk and see if you have the
lines:
# Disable PIE/SSP if GCC supports them. They can break us.
CFLAGS += $(call test-gcc-flag,-nopie)
CFLAGS += $(call test-gcc-flag,-fno-stack-protector)
CFLAGS += $(call test-gcc-flag,-fno-stack-protector-all)
If so then you have a *very* up-to-date tree. :-) I recently checked
in a build fix that would disable PIE/SSP iff they are supported by
GCC.
If not then I'm confused!
Is it possible to have Xen inherit these CFLAGS as a base, and then modify
them as required? Part of the enthusiasm over Gentoo is the ability to
customise and optimise the applications.
If you're talking about kernel, I don't think it's a good idea. None of
the packages under sys-kernel inherits CFLAGS from Portage's
/etc/make.conf.
Yeah, it's a bad idea! Kernels are very sensitive to compile flags
-- both Xen and Linux use a wide range of GCC features and frequently
use inline assembler, so the code is fragile when flags are changed
from what we developers use. Allowing CFLAGS to be modified would be
giving users a loaded gun. :-)
-- Keir
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