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| author | Fangrui Song <maskray@google.com> | 2019-12-21 23:18:24 -0800 |
|---|---|---|
| committer | Fangrui Song <maskray@google.com> | 2019-12-22 00:01:42 -0800 |
| commit | 527b0f8c7448707aa6b8159e6e4707a49f1dcb87 (patch) | |
| tree | 43ce9a40f1bbe61ee5de4dcf7b6ddd561ee56368 /clang/lib/Frontend/FrontendActions.cpp | |
| parent | d0bfb3c583031f410e8219155f0cf9ee8fb08504 (diff) | |
| download | llvm-527b0f8c7448707aa6b8159e6e4707a49f1dcb87.zip llvm-527b0f8c7448707aa6b8159e6e4707a49f1dcb87.tar.gz llvm-527b0f8c7448707aa6b8159e6e4707a49f1dcb87.tar.bz2 | |
[Driver] Allow -mnop-mcount for SystemZ and -mfentry for X86 and SystemZ
gcc/config/{i386,s390} support -mnop-mcount. We currently only support
-mnop-mcount for SystemZ. The function attribute "mnop-mcount" is
ignored on other targets.
gcc/config/{i386,s390} support -mfentry. We currently only support
-mfentry for X86 and SystemZ. TargetOpcode::FENTRY_CALL is not handled
on other targets.
% clang -target aarch64 -pg -mfentry a.c -c
fatal error: error in backend: Not supported instr: <MCInst 21>
-mfentry, -mrecord-mcount, and -mnop-mcount were invented for Linux
ftrace. Linux uses $(call cc-option-yn,-mrecord-mcount) to detect if the
specific feature is available. Reject unsupported features so that Linux
build system will not wrongly consider them available and cause
build/runtime failures.
Note, GCC has stricter checks that we do not implement, e.g. -fpic/-fpie
-fnop-mcount is not allowed on x86, -fpic/-fpie -mfentry is not allowed
on x86-32.
Diffstat (limited to 'clang/lib/Frontend/FrontendActions.cpp')
0 files changed, 0 insertions, 0 deletions