efriedma created this revision. efriedma added reviewers: fhahn, SjoerdMeijer. Herald added a reviewer: javed.absar. Herald added a subscriber: kristof.beyls.
Passing the features in random order will lead to unpredictable results when some of the features are related (like the architecture-version feature on ARM). It might be possible to fix this particular case in the ARM target code, to avoid adding overlapping target features. But we should probably be sorting in any case: the behavior shouldn't depend on StringMap's hashing algorithm. Repository: rC Clang https://reviews.llvm.org/D46030 Files: lib/Basic/Targets.cpp test/CodeGen/arm-build-attributes.c Index: test/CodeGen/arm-build-attributes.c =================================================================== --- /dev/null +++ test/CodeGen/arm-build-attributes.c @@ -0,0 +1,3 @@ +// RUN: %clang --target=arm-none-eabi -x c - -o - -S < %s -mcpu=cortex-a5 -mfpu=vfpv4-d16 | FileCheck %s +// CHECK: .fpu vfpv4-d16 +void foo() {} Index: lib/Basic/Targets.cpp =================================================================== --- lib/Basic/Targets.cpp +++ lib/Basic/Targets.cpp @@ -638,6 +638,7 @@ Opts->Features.clear(); for (const auto &F : Features) Opts->Features.push_back((F.getValue() ? "+" : "-") + F.getKey().str()); + llvm::sort(Opts->Features.begin(), Opts->Features.end()); if (!Target->handleTargetFeatures(Opts->Features, Diags)) return nullptr;
Index: test/CodeGen/arm-build-attributes.c =================================================================== --- /dev/null +++ test/CodeGen/arm-build-attributes.c @@ -0,0 +1,3 @@ +// RUN: %clang --target=arm-none-eabi -x c - -o - -S < %s -mcpu=cortex-a5 -mfpu=vfpv4-d16 | FileCheck %s +// CHECK: .fpu vfpv4-d16 +void foo() {} Index: lib/Basic/Targets.cpp =================================================================== --- lib/Basic/Targets.cpp +++ lib/Basic/Targets.cpp @@ -638,6 +638,7 @@ Opts->Features.clear(); for (const auto &F : Features) Opts->Features.push_back((F.getValue() ? "+" : "-") + F.getKey().str()); + llvm::sort(Opts->Features.begin(), Opts->Features.end()); if (!Target->handleTargetFeatures(Opts->Features, Diags)) return nullptr;
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