3681be876f
GCC 7 introduced -fprofile-update={atomic,prefer-atomic} (prefer-atomic is for
best efforts (some targets do not support atomics)) to increment counters
atomically, which is exactly what we have done with -fprofile-instr-generate
(D50867) and -fprofile-arcs (b5ef137c11b1cc6ae839ee75b49233825772bdd0).
This patch adds the option to clang to surface the internal options at driver level.
GCC 7 also turned on -fprofile-update=prefer-atomic when -pthread is specified,
but it has performance regression
(https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89307). So we don't follow suit.
Differential Revision: https://reviews.llvm.org/D87737
16 lines
766 B
C
16 lines
766 B
C
/// For -fprofile-instr-generate and -fprofile-arcs, increment counters atomically
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/// if -fprofile-update={atomic,prefer-atomic} or -fsanitize=thread is specified.
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// RUN: %clang -### %s -c -target x86_64-linux -fsanitize=thread %s 2>&1 | FileCheck %s
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// RUN: %clang -### %s -c -fprofile-update=atomic 2>&1 | FileCheck %s
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// RUN: %clang -### %s -c -fprofile-update=prefer-atomic 2>&1 | FileCheck %s
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// CHECK: "-fprofile-update=atomic"
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// RUN: %clang -### %s -c -fprofile-update=atomic -fprofile-update=single 2>&1 | FileCheck %s --check-prefix=SINGLE
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// SINGLE-NOT: "-fprofile-update=atomic"
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// RUN: not %clang %s -c -fprofile-update=unknown 2>&1 | FileCheck %s --check-prefix=ERROR
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// ERROR: error: unsupported argument 'unknown' to option 'fprofile-update='
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