[Bug build/24529] New: Static linking issue with getcontext/setcontext and PIC on ARM

["hd at os-cillation dot de" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=24529

            Bug ID: 24529
           Summary: Static linking issue with getcontext/setcontext and
                    PIC on ARM
           Product: glibc
           Version: 2.29
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: hd@os-cillation.de
                CC: carlos at redhat dot com
  Target Milestone: ---

Hello,

we observe the following issue statically linking in libc.a:

/usr/sbin/ld:
/usr/lib/gcc/armv7l-unknown-linux-gnueabihf/8.3.0/../../../libc.a(getcontext.o):
in function `getcontext':
(.text+0x88): undefined reference to `_rtld_global_ro'
/usr/sbin/ld:
/usr/lib/gcc/armv7l-unknown-linux-gnueabihf/8.3.0/../../../libc.a(setcontext.o):
in function `__startcontext':
(.text+0x80): undefined reference to `_rtld_global_ro'

This seems to be due our static pie enabled toolchain and ifdef PIC vs SHARED
confusion in

https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/arm/getcontext.S;h=e072c30fc7a64ffe723bbae52f6eb2736d999bd5;hb=HEAD#l53
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/arm/getcontext.S;h=e072c30fc7a64ffe723bbae52f6eb2736d999bd5;hb=HEAD#l105

https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/arm/setcontext.S;h=3381b9486126d5492ddbddf79b599b35aab16eb3;hb=HEAD#l35
https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/arm/setcontext.S;h=3381b9486126d5492ddbddf79b599b35aab16eb3;hb=HEAD#l104

I guess that needs to be fixed like in
https://sourceware.org/git/?p=glibc.git;a=commit;h=3ee578690f35942f41926cc2d98e25b3d0d08c71
?

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