https://bugs.llvm.org/show_bug.cgi?id=49694
Bug ID: 49694
Summary: error: option '-mfloat128' cannot be specified with
'ppc64le'
Product: clang
Version: trunk
Hardware: Other
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Driver
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Using -mfloat128 on ppc64 gives this error:
error: option '-mfloat128' cannot be specified with 'ppc64le'
The docs seem suggest it should be valid:
https://clang.llvm.org/docs/ClangCommandLineReference.html#cmdoption-clang-mfloat128
(although a list of flags with no actual documentation isn't very clear).
clang/lib/Basic/Targets/PPC.cpp has a confusing comment:
if (!(ArchDefs & ArchDefinePwr9) && (ArchDefs & ArchDefinePpcgr) &&
llvm::find(FeaturesVec, "+float128") != FeaturesVec.end()) {
// We have __float128 on PPC but not power 9 and above.
Diags.Report(diag::err_opt_not_valid_with_opt) << "-mfloat128" << CPU;
return false;
}
That comment says the type should be valid for "PPC but not power 9 and above",
but what it really means is "only for power 9 and above". If you add
-mcpu=power9 then -mfloat128 is accepted. I think the comment is just badly
phrased.
The error message would be a lot more useful if it told you that you need
power9. The comment in the source should also match the code.
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