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<base href="http://llvm.org/bugs/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - libclang does not get the header search correct"
href="http://llvm.org/bugs/show_bug.cgi?id=17776">17776</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>libclang does not get the header search correct
</td>
</tr>
<tr>
<th>Product</th>
<td>new-bugs
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>new bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jgunthorpe@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>For instance, if we run one of the included python tests using the raw build
directory from cmake+ninja:
$ LD_LIBRARY_PATH=/scratchl/jgg/llvm/build/lib/
PYTHONPATH=/scratchl/jgg/llvm/tools/clang/bindings/python
python
/scratchl/jgg/llvm/tools/clang/bindings/python/examples/cindex/cindex-dump.py
t.c -v
Here! ../tools/clang/lib/Driver/Driver.cpp:68 Dir=
clang version 3.4
Target: x86_64-unknown-linux-gnu
Thread model: posix
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/i686-linux-gnu/4.7.3
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Found candidate GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7.3
Selected GCC installation: /usr/lib/gcc/x86_64-linux-gnu/4.7
Here! ../tools/clang/lib/Frontend/ASTUnit.cpp:2038
ResourceFilesPath=/scratchl/jgg/llvm/build/lib/clang/3.4
ignoring nonexistent directory "../lib/clang/3.4/include"
The 'ignoring nonexistent directory' line shows the wrong path, it should be
prefixed with the bin dir. Eg when running clang natively that doesn't print
and the search path properly includes:
/scratchl/jgg/llvm/build/bin/../lib/clang/3.4/include
Which is missing from the libclang version.
This problem causes parses through libclang to fail, typically with cannot find
stddef.h warnings.
I've edited the source (using GIT as of today) and added some Here! prints to
show some of the flow.
Analysis:
libclang uses the code in CIndexer::getClangResourcesPath() to locate the
installation relative to the shared library location. This code is working
fine, the 2nd Here! above prints the result of that function as it shows up in
ASTUnit::LoadFromCommandLine as ResourceFilesPath
However, the value ResourceFilesPath is no longer used on Linux because
InitHeaderSearch::AddDefaultIncludePaths exits early. On Linux the include
files are found via the Driver constructor's ClangExecutable argument, which is
wired to 'clang' when libclang is being used.
Which is because of this code in clang::createInvocationFromCommandLine
// FIXME: We shouldn't have to pass in the path info.
driver::Driver TheDriver("clang", llvm::sys::getDefaultTargetTriple(),
"a.out", *Diags);
The driver should probably be created with something like ResourceFilesPath +
"../bin/clang" until the FIXME is solved properly..</pre>
</div>
</p>
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