https://sourceware.org/bugzilla/show_bug.cgi?id=24784
Bug ID: 24784
Summary: elf_x86_64_check_tls_transition should allow
R_X86_64_GOTPCREL (-fno-plt)
Product: binutils
Version: 2.33 (HEAD)
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: maskray at google dot com
Target Milestone: ---
thread_local int a;
int main() { return a; }
% g++ -fno-plt -fpic a.cc -Wa,-mrelax-relocations=no -fuse-ld=bfd
/usr/bin/ld.bfd: /tmp/ccLggG8h.o: TLS transition from R_X86_64_TLSGD to
R_X86_64_GOTTPOFF against `a' at 0x8 in section `.text' failed
/usr/bin/ld.bfd: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
static thread_local int a;
int main() { return a; }
% g++ -fno-plt -fpic a.cc -Wa,-mrelax-relocations=no -fuse-ld=bfd
/usr/bin/ld.bfd: /tmp/ccO9KvlL.o: TLS transition from R_X86_64_TLSGD to
R_X86_64_TPOFF32 against `_ZL1a' at 0x8 in section `.text' failed
/usr/bin/ld.bfd: final link failed: Nonrepresentable section on output
collect2: error: ld returned 1 exit status
Due to -Wa,-mrelax-relocations=no, R_X86_64_GOTPCREL instead of
R_X86_64_GOTPCRELX is generated.
a9: callq *(%rip)
00000000000000ad: R_X86_64_GOTPCREL __tls_get_addr-4
// bfd/elf-x86-64.c:elf_x86_64_check_tls_transition
...
if (largepic)
return r_type == R_X86_64_PLTOFF64;
else if (indirect_call)
return r_type == R_X86_64_GOTPCRELX; // It should allow R_X86_64_GOTPCREL
else
return (r_type == R_X86_64_PC32 || r_type == R_X86_64_PLT32);
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