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[ELF] Don't emit SHF_GNU_RETAIN on Solaris

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The introduction of `SHF_GNU_RETAIN` has caused massive problems on Solaris.

Initially, as reported in Bug 49437, it caused dozens of testsuite failures
on both sparc and x86.  The objects were marked as `ELFOSABI_NONE`, but
`SHF_GNU_RETAIN` is a GNU extension. In the native Solaris ABI, that flag
(in the range for OS-specific values) is `SHF_SUNW_ABSENT` with a
completely different semantics, which confuses Solaris `ld` very much.

Later, the objects became (correctly) marked `ELFOSABI_GNU`, which Solaris
`ld` doesn't support, causing it to SEGV and break the build.  The linker
is currently being hardened to not accept non-native OS ABIs to avoid this.

The need for linker support is already documented in
`clang/include/clang/Basic/AttrDocs.td`, but not currently checked.

This patch avoids all this by not emitting `SHF_GNU_RETAIN` on Solaris at all.

Tested on `amd64-pc-solaris2.11`, `sparcv9-sun-solaris2.11`, and
`x86_64-pc-linux-gnu`.

Differential Revision: https://reviews.llvm.org/D107747

(cherry picked from commit 7bbbf2956181f375ab193321b37ea71c5fc44054)
This commit is contained in:
Rainer Orth 2021-08-11 09:27:51 +02:00 committed by Tom Stellard
parent fd411b2b5d
commit 4a38ef8718
1 changed files with 7 additions and 4 deletions
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11
lib/CodeGen/TargetLoweringObjectFileImpl.cpp
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@ -677,8 +677,9 @@ calcUniqueIDUpdateFlagsAndSize(const GlobalObject *GO, StringRef SectionName,
} }
if (Retain) { if (Retain) {
if (Ctx.getAsmInfo()->useIntegratedAssembler() || if ((Ctx.getAsmInfo()->useIntegratedAssembler() ||
Ctx.getAsmInfo()->binutilsIsAtLeast(2, 36)) Ctx.getAsmInfo()->binutilsIsAtLeast(2, 36)) &&
!TM.getTargetTriple().isOSSolaris())
Flags |= ELF::SHF_GNU_RETAIN; Flags |= ELF::SHF_GNU_RETAIN;
return NextUniqueID++; return NextUniqueID++;
} }
@ -855,8 +856,10 @@ static MCSection *selectELFSectionForGlobal(
EmitUniqueSection = true; EmitUniqueSection = true;
Flags |= ELF::SHF_LINK_ORDER; Flags |= ELF::SHF_LINK_ORDER;
} }
if (Retain && (Ctx.getAsmInfo()->useIntegratedAssembler() || if (Retain &&
Ctx.getAsmInfo()->binutilsIsAtLeast(2, 36))) { (Ctx.getAsmInfo()->useIntegratedAssembler() ||
Ctx.getAsmInfo()->binutilsIsAtLeast(2, 36)) &&
!TM.getTargetTriple().isOSSolaris()) {
EmitUniqueSection = true; EmitUniqueSection = true;
Flags |= ELF::SHF_GNU_RETAIN; Flags |= ELF::SHF_GNU_RETAIN;
} }