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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Usage of "-fsyntax-only" in lib Tooling not compatible with cl driver mode"
href="https://llvm.org/bugs/show_bug.cgi?id=23197">23197</a>
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<th>Summary</th>
<td>Usage of "-fsyntax-only" in lib Tooling not compatible with cl driver mode
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>bugs.brainlab.eiband@gmail.com
</td>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>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.</pre>
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