[Bug dynamic-link/28152] New: elf: clang integrated assembler and ld.lld do not support .tls_common

["i at maskray dot me" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28152

            Bug ID: 28152
           Summary: elf: clang integrated assembler and ld.lld do not
                    support .tls_common
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: dynamic-link
          Assignee: unassigned at sourceware dot org
          Reporter: i at maskray dot me
  Target Milestone: ---

The integrated assembler does not support the obsoleted .tls_common directive

% clang -c -x assembler =(printf '.tls_common x,4,4\n')
/tmp/zsh5QvAWt:1:1: error: unknown directive
.tls_common x,4,4
^

ld.lld doesn't support it (there is no point supporting the obsoleted feature)

% clang -c -x assembler -fno-integrated-as =(printf '.tls_common x,4,4\n') -o
a.o && ld.lld a.o
ld.lld: warning: cannot find entry symbol _start; defaulting to 0x201158
ld.lld: error: a.o has an STT_TLS symbol but doesn't have an SHF_TLS section

elf/tls-macros.h COMMON_INT_DEF uses .tls_common and therefore some tests can
be built/linked with clang or ld.lld

Testing assembling and linking of .tls_common is binutils gas/ld's
responsibility, not glibc's.

https://sourceware.org/pipermail/libc-alpha/2021-July/129451.html (elf: Replace
.tls_common with .tbss definition) can make the tests buildable with clang and
ld.lld

(There is a long way for clang to build glibc itself.
https://sourceware.org/bugzilla/show_bug.cgi?id=27220 (nested functions in
elf/) is the main one.)

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