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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - compiler response file isn't used when command line is close to response file limit"
href="https://llvm.org/bugs/show_bug.cgi?id=27491">27491</a>
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<th>Summary</th>
<td>compiler response file isn't used when command line is close to response file limit
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>3.7
</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>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
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<th>Reporter</th>
<td>dvaliant@ea.com
</td>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Description:
On windows 7 it appears clang calls itself as a subprocess when used to
compile. For short command lines subprocess is called with all arguments on
command line for large command lines a response file is used. However it
appears if command line used for subprocess is only just over the limit clang
will not use a response file when it should and fail with:
clang++.exe : error : unable to execute command: Couldn't execute program
'C:\some\system\path\LLVM\bin\clang++.exe'The filename or extension is too
long.
Problem appears more frequently the longer the absolute path to clang++.exe
Repro:
- Call clang++.exe to compile any simple cpp file using a response file, use -v
argument to see if clang uses response file when calling clang subprocess
- artificially inflate response file by adding defines (e.g -D BLOAT) until you
see above error message (will happen close 32768 characters)
- if you see clang using response file try trimming response file by a
character at a time, the range is very small (bad range seems to be length of
executable path)</pre>
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