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[Driver] Default Generic_GCC ppc/ppc64/ppc64le to -fasynchronous-unwind-tables

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GCC made the switch on 2018-04-10 ("rs6000: Enable -fasynchronous-unwind-tables by default").
In Clang, FreeBSD/NetBSD powerpc have already defaulted to -fasynchronous-unwind-tables.

This patch defaults Generic_GCC powerpc (which affects Linux) to use -fasynchronous-unwind-tables.

Reviewed By: #powerpc, nemanjai

Differential Revision: https://reviews.llvm.org/D92054
This commit is contained in:
Fangrui Song
2020-12-21 15:32:35 -08:00
parent 7f40bb3b04
commit 6bbb04a732
3 changed files with 14 additions and 5 deletions
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4
clang/docs/ReleaseNotes.rst
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@@ -118,6 +118,10 @@ Modified Compiler Flags
`-fno-delete-null-pointer-checks` has gained the power to remove the
`nonnull` attribute on `this` for configurations that need it to be nullable.
- ``-gsplit-dwarf`` no longer implies ``-g2``.
- ``-fasynchronous-unwind-tables`` is now the default on Linux AArch64/PowerPC.
This behavior matches newer GCC.
(`D91760 <https://reviews.llvm.org/D91760>`_)
(`D92054 <https://reviews.llvm.org/D92054>`_)
Removed Compiler Flags
-------------------------

3
clang/lib/Driver/ToolChains/Gnu.cpp
View File

@@ -2674,6 +2674,9 @@ void Generic_GCC::printVerboseInfo(raw_ostream &OS) const {
bool Generic_GCC::IsUnwindTablesDefault(const ArgList &Args) const {
switch (getArch()) {
case llvm::Triple::aarch64:
case llvm::Triple::ppc:
case llvm::Triple::ppc64:
case llvm::Triple::ppc64le:
case llvm::Triple::x86_64:
return true;
default:

12
clang/test/Driver/ppc-features.cpp
View File

@@ -1,6 +1,7 @@
/// Check default CC1 and linker options for ppc32.
// RUN: %clang -### -target powerpc-unknown-linux-gnu %s 2>&1 | FileCheck --check-prefix=PPC32 %s
// PPC32: "-mfloat-abi" "hard"
// PPC32: "-munwind-tables"
// PPC32-SAME: "-mfloat-abi" "hard"
// PPC32: "-m" "elf32ppclinux"
@@ -38,11 +39,12 @@
/// Check default CC1 and linker options for ppc64.
// RUN: %clang -### -target powerpc64le-unknown-linux-gnu %s 2>&1 | FileCheck --check-prefix=PPC64 %s
// RUN: %clang -### -target powerpc64-unknown-linux-gnu %s 2>&1 | FileCheck -check-prefix=PPC64BE %s
// PPC64: "-mfloat-abi" "hard"
// RUN: %clang -### -target powerpc64le-unknown-linux-gnu %s 2>&1 | FileCheck --check-prefixes=PPC64,PPC64LE %s
// RUN: %clang -### -target powerpc64-unknown-linux-gnu %s 2>&1 | FileCheck --check-prefixes=PPC64,PPC64BE %s
// PPC64: "-munwind-tables"
// PPC64-SAME: "-mfloat-abi" "hard"
// PPC64: "-m" "elf64lppc"
// PPC64LE: "-m" "elf64lppc"
// PPC64BE: "-m" "elf64ppc"
// check -msoft-float option for ppc64