https://llvm.org/bugs/show_bug.cgi?id=23197
Bug ID: 23197
Summary: Usage of "-fsyntax-only" in lib Tooling not compatible
with cl driver mode
Product: clang
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The string literal "-fsyntax-only" is used in several places of the clang code.
However this option is not a valid option in cl mode. Code which uses this
literal must be sure that the cl mode is not set. In cl mode the corresponding
option is "/Zs".
I am using clang tooling on windows in cl mode. The method
getClangSyntaxOnlyAdjuster() adds the option "-fsyntax-only" to clang tools
without checking for cl mode.
Result: A warning is shown that the option "-fsyntax-only" is not supported.
Expected result: No warning issued for options which were not specified on the
command line.
Two alternative changes fixed this issue for me:
A) Use "/Zs" instead of "-fsyntax-only" in function
getClangSyntaxOnlyAdjuster() when in cl mode.
B) Make -fsyntax-only a CoreOption in Options.td. Reading the sources, only
options with flags CLOption or CoreOption are valid in cl mode.
I am quite new to the LLVM/Clang code so I cannot say how an appropriate fix
would look like.
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