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The ClangBuiltLinux project relies on `-mcpu=405`. Before
https://reviews.llvm.org/D139720, `clang` treated `-mcpu=405` implicitly in the
same way as `-mcpu=generic`, because `405` was an unknown value and `clang` did
not check unknown input values. https://reviews.llvm.org/D139720 added the
check of `-mcpu` input value, and `clang` generates an error with `-mcpu=405`.
For further details of the problem, see
https://github.com/ClangBuiltLinux/linux/issues/1771.
This patch adds support of `-mcpu=405` explicitly, and treats it as an
equivalent of `-mcpu=generic`.
Repository:
rG LLVM Github Monorepo
https://reviews.llvm.org/D140080
Files:
clang/lib/Driver/ToolChains/Arch/PPC.cpp
clang/test/Driver/ppc-cpus.c
Index: clang/test/Driver/ppc-cpus.c
===================================================================
--- clang/test/Driver/ppc-cpus.c
+++ clang/test/Driver/ppc-cpus.c
@@ -31,3 +31,9 @@
// RUN: %clang -### -c --target=powerpc64 %s -mcpu=generic -mtune=pwr9 2>&1 |
FileCheck %s --check-prefix=TUNE
// TUNE: "-target-cpu" "ppc64" "-tune-cpu" "pwr9"
+
+/// Test mcpu options that are equivalent to "generic"
+// RUN: %clang -### -c -target powerpc64 %s -mcpu=generic 2>&1 | FileCheck %s
--check-prefix=GENERIC
+// RUN: %clang -### -c -target powerpc64 %s -mcpu=405 2>&1 | FileCheck %s
--check-prefix=GENERIC
+//
+// GENERIC: "-target-cpu" "ppc64"
Index: clang/lib/Driver/ToolChains/Arch/PPC.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Arch/PPC.cpp
+++ clang/lib/Driver/ToolChains/Arch/PPC.cpp
@@ -20,6 +20,14 @@
using namespace clang;
using namespace llvm::opt;
+static constexpr llvm::StringLiteral GenericPPCTargetNames[] = {{"generic"},
+ {"405"}};
+
+/// Check if Name is known to be equivalent to "generic".
+static bool isGenericPPCTargetName(const StringRef &Name) {
+ return llvm::is_contained(GenericPPCTargetNames, Name);
+}
+
static std::string getPPCGenericTargetCPU(const llvm::Triple &T) {
// LLVM may default to generating code for the native CPU,
// but, like gcc, we default to a more generic option for
@@ -39,7 +47,7 @@
if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ)) {
StringRef CPUName = A->getValue();
- if (CPUName == "generic")
+ if (isGenericPPCTargetName(CPUName))
return getPPCGenericTargetCPU(T);
if (CPUName == "native") {
Index: clang/test/Driver/ppc-cpus.c
===================================================================
--- clang/test/Driver/ppc-cpus.c
+++ clang/test/Driver/ppc-cpus.c
@@ -31,3 +31,9 @@
// RUN: %clang -### -c --target=powerpc64 %s -mcpu=generic -mtune=pwr9 2>&1 | FileCheck %s --check-prefix=TUNE
// TUNE: "-target-cpu" "ppc64" "-tune-cpu" "pwr9"
+
+/// Test mcpu options that are equivalent to "generic"
+// RUN: %clang -### -c -target powerpc64 %s -mcpu=generic 2>&1 | FileCheck %s --check-prefix=GENERIC
+// RUN: %clang -### -c -target powerpc64 %s -mcpu=405 2>&1 | FileCheck %s --check-prefix=GENERIC
+//
+// GENERIC: "-target-cpu" "ppc64"
Index: clang/lib/Driver/ToolChains/Arch/PPC.cpp
===================================================================
--- clang/lib/Driver/ToolChains/Arch/PPC.cpp
+++ clang/lib/Driver/ToolChains/Arch/PPC.cpp
@@ -20,6 +20,14 @@
using namespace clang;
using namespace llvm::opt;
+static constexpr llvm::StringLiteral GenericPPCTargetNames[] = {{"generic"},
+ {"405"}};
+
+/// Check if Name is known to be equivalent to "generic".
+static bool isGenericPPCTargetName(const StringRef &Name) {
+ return llvm::is_contained(GenericPPCTargetNames, Name);
+}
+
static std::string getPPCGenericTargetCPU(const llvm::Triple &T) {
// LLVM may default to generating code for the native CPU,
// but, like gcc, we default to a more generic option for
@@ -39,7 +47,7 @@
if (Arg *A = Args.getLastArg(clang::driver::options::OPT_mcpu_EQ)) {
StringRef CPUName = A->getValue();
- if (CPUName == "generic")
+ if (isGenericPPCTargetName(CPUName))
return getPPCGenericTargetCPU(T);
if (CPUName == "native") {
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