Re: [PATCH] Fix pr80044, -static and -pie insanity, and pr81170

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

On Tue, Jul 18, 2017 at 7:09 AM, Alan Modra <amodra@gmail.com> wrote:
> On Tue, Jul 18, 2017 at 05:36:49AM -0700, H.J. Lu wrote:
>> I am working on compiling libc.a in glibc with -fPIE and building static
>> PIE.  This creates static executable with PIE:
>>
>> gcc -nostdlib -nostartfiles -static -o
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/elf/sln -pie
>> -Wl,--no-dynamic-linker
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/csu/crt1.o
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/csu/crti.o `gcc
>> --print-file-name=crtbeginS.o`
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/elf/sln.o
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/elf/static-stubs.o
>>  -Wl,--start-group
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/libc.a -lgcc
>> -Wl,--end-group `gcc  --print-file-name=crtendS.o`
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/csu/crtn.o
>>
>> Currently, it only works with gcc configured with -disable-default-pie.
>> With --enable-default-pie, I got
>>
>> [hjl@gnu-tools-1 build-x86_64-linux]$ /usr/gcc-7.1.1-x32-pie/bin/gcc
>> -nostdlib -nostartfiles -static -o /tmp/sln -pie
>> -Wl,--no-dynamic-linker
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/csu/crt1.o
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/csu/crti.o `gcc
>> --print-file-name=crtbeginS.o`
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/elf/sln.o
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/elf/static-stubs.o
>>  -Wl,--start-group
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/libc.a -lgcc
>> -Wl,--end-group `gcc  --print-file-name=crtendS.o`
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/csu/crtn.o
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/libc.a(dl-support.o):
>> In function `elf_machine_load_address':
>> /export/gnu/import/git/sources/glibc/elf/../sysdeps/x86_64/dl-machine.h:59:
>> undefined reference to `_DYNAMIC'
>> /export/build/gnu/glibc-static-pie/build-x86_64-linux/libc.a(dl-support.o):
>> In function `elf_get_dynamic_info':
>> /export/gnu/import/git/sources/glibc/elf/get-dynamic-info.h:48:
>> undefined reference to `_DYNAMIC'
>> collect2: error: ld returned 1 exit status
>> [hjl@gnu-tools-1 build-x86_64-linux]$
>>
>> Will your change fix it?
>
> You have got to be joking!  How should I know whether something will
> work with some hare-brained scheme of yours?  One that seemingly
> requires you to specify startup files by hand!
>

The difference is with --enable-default-pie, the gcc driver doesn't pass
both -pie and -static ld when "-static -pie" is used.   Does your change
pass both -pie and -static ld when "-static -pie" is used?

-- 
H.J.