Re: [gentoo-dev] What to do with things like -fpie in CFLAGS in environment?

[Vibhav Garg <vgarg@gentoo.org>]

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Maurice van der Pot wrote:
> On Tue, Apr 12, 2005 at 12:10:25PM -0400, Daniel Ostrow wrote:
> 
>>Take a look at dev-libs/glib/files/glib-2.6.3-testglib-ssp.patch to see
>>how solar and I dealt with a similar issue with tests and ssp. See if
>>you can adapt it, we just forced -fno-stack-protector after the CFLAGS
>>pulled in from the system.
>>
> 
> 
> Ok, so I thought it was all well and good, but now a bug report made me
> realise that gcc < 3.4 doesn't have -fpie/-fno-pie.
> 
> Here's the problem:
> 1) valgrind has some features that only work with -fpie
> 2) valgrind's tests fail to build with -fpie
> 3) because of the hardened gcc profile, valgrind's tests need -fno-pie
> 4) simply patching some makefiles to add -fno-pie for tests is not
>    possible because gcc < 3.4 doesn't support -fno-pie
> 5) having the valgrind developers modify their configure/makefiles to
>    add -fno-pie for tests in case gcc supports it is not enough, because
>    user CFLAGS are appended and CFLAGS in make.conf may contain -fpie
> 6) using filter-flags to get rid of -fpie in user's CFLAGS actually
>    adds -fno-pie and disables features referred to in 1)
> 
> What do I do now? 
> 
> Why is -fno-pie being added by filter-flags anyway? 
> 
> Maurice.
> 
Sorry for the dumb question but was do -fpie and -fno-pie do?

Vibhav
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