Re: -static-pie and -static -pie

["H.J. Lu" <hjl.tools@gmail.com>]

On Tue, Jan 30, 2018 at 11:07 AM, Cory Fields <lists@coryfields.com> wrote:
> On Tue, Jan 30, 2018 at 1:35 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
>> On Tue, Jan 30, 2018 at 10:26 AM, Cory Fields <lists@coryfields.com> wrote:
>>> Hi list
>>>
>>> I'm playing with -static-pie and musl, which seems to be in good shape
>>> for 8.0.0. Nice work :)
>>>
>>> However, the fact that "gcc -static -pie" and "gcc -static-pie"
>>> produce different results is very unexpected. I understand the case
>>> for the new link-type, but merging the options when possible would be
>>> a huge benefit to existing buildsystems that already cope with both
>>> individually.
>>>
>>> My use-case:
>>> I'd like to build with --enable-default-pie, and by adding "-static"
>>
>> Why not adding "-static-pie" instead of "-static"?
>>
>>> to my builds, produce static-pie binaries. But at the moment, that
>>> attempts to add an interp section.
>>>
>>> So my question is, if no conflicting options are found, why not hoist
>>> "-static -pie" to "-static-pie" ?
>>>
>>> Regards,
>>> Cory
>>
>>
>>
>> --
>> H.J.
>
> My build system, and plenty of others I'm sure, already handle -static
> and -pie. Having that understood to mean "static-pie" would mean that
> the combination would now just work.
>
> Asking a different way, if I request -static and -pie, without -nopie,
> quietly creating non-pie binary seems like a bug. Is there a reason
> _not_ to interpret it as -static-pie in that case?

GNU_USER_TARGET_STARTFILE_SPEC is defined as

#define GNU_USER_TARGET_STARTFILE_SPEC \
  "%{shared:; \
     pg|p|profile:%{static-pie:grcrt1.o%s;:gcrt1.o%s}; \
     static:crt1.o%s; \
     static-pie:rcrt1.o%s; \
     " PIE_SPEC ":Scrt1.o%s; \
     :crt1.o%s} \
   crti.o%s \
   %{static:crtbeginT.o%s; \
     shared|static-pie|" PIE_SPEC ":crtbeginS.o%s; \
     :crtbegin.o%s} \
   %{fvtable-verify=none:%s; \
     fvtable-verify=preinit:vtv_start_preinit.o%s; \
     fvtable-verify=std:vtv_start.o%s} \
   " CRTOFFLOADBEGIN

to pick a suitable crt1.o for static PIE when -static-pie is used.

If gcc.c can convert ... -static ... -pie and ... -pie ... -static ... to
-static-pic for GNU_USER_TARGET_STARTFILE_SPEC, it
should work.

-- 
H.J.