Re: [Xen-devel] Inheriting CFLAGS

[Jan Kundrát <jan.kundrat@xxxxxx>]

> > > 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!

No, I can't seen anything like that. 

zirafa ~ # gcc -v
Reading specs from /usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.4/specs
Configured with: /var/tmp/portage/gcc-3.3.4-r1/work/gcc-3.3.4/configure 
--prefix=/usr --bindir=/usr/i686-pc-linux-gnu/gcc-bin/3.3 
--includedir=/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.4/include 
--datadir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3 
--mandir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3/man 
--infodir=/usr/share/gcc-data/i686-pc-linux-gnu/3.3/info --enable-shared 
--host=i686-pc-linux-gnu --target=i686-pc-linux-gnu --with-system-zlib 
--enable-languages=c,c++ --enable-threads=posix --enable-long-long 
--disable-checking --disable-libunwind-exceptions--enable-cstdio=stdio 
--enable-version-specific-runtime-libs 
--with-gxx-include-dir=/usr/lib/gcc-lib/i686-pc-linux-gnu/3.3.4/include/g++-v3 
--with-local-prefix=/usr/local --enable-shared --enable-nls 
--without-included-gettext --disable-multilib --enable-__cxa_atexit 
--enable-clocale=generic
Thread model: posix
gcc version 3.3.4 20040623 (Gentoo Linux 3.3.4-r1, ssp-3.3.2-2, pie-8.7.6)
zirafa ~ # ebuild /usr/local/portage/sys-apps/xen/xen-2.0.ebuild unpack
zirafa ~ # cat /var/tmp/portage/xen-2.0/work/xen-2.0/xen/arch/x86/Rules.mk
########################################
# x86-specific definitions

CC := gcc
LD := ld

CFLAGS  := -nostdinc -fno-builtin -fno-common -fno-strict-aliasing
CFLAGS  += -iwithprefix include -Wall -Werror -pipe
CFLAGS  += -I$(BASEDIR)/include -Wno-pointer-arith -Wredundant-decls

ifeq ($(optimize),y)
CFLAGS  += -O3 -march=pentium2 -pipe -fomit-frame-pointer
else
x86_32/usercopy.o: CFLAGS += -O1
endif


# Prevent floating-point variables from creeping into Xen.
CFLAGS  += -msoft-float

ifeq ($(TARGET_SUBARCH),x86_32)
CFLAGS  += -m32 -march=i686
LDFLAGS := --oformat elf32-i386
endif

ifeq ($(TARGET_SUBARCH),x86_64)
CFLAGS  += -m64 -mno-red-zone -fpic -fno-reorder-blocks
CFLAGS  += -fno-asynchronous-unwind-tables
LDFLAGS := --oformat elf64-x86-64
endif





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