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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - cannot control search path order with -stdlib=libc++"
href="https://bugs.llvm.org/show_bug.cgi?id=49855">49855</a>
</td>
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<tr>
<th>Summary</th>
<td>cannot control search path order with -stdlib=libc++
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>yichen.yan@inf.ethz.ch
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
</td>
</tr></table>
<p>
<div>
<pre>-stdlib=libc++ will `push_back` to the search path and I met few packages that
will fail due to this.
I understand this should be fixed in the build system of the packages for
misuse `-I`, but do you think a small revision in clang would be helpful?
minimal repro:
root@cc6f61d60963:/test# cat test.cc
#include <cstddef>
root@cc6f61d60963:/test# cat version
user-defined-context
root@cc6f61d60963:/test# /llvm-install/bin/clang++ -stdlib=libc++ -I. -c
test.cc -o /dev/null
In file included from test.cc:1:
In file included from /llvm-install/bin/../include/c++/v1/cstddef:37:
./version:1:1: error: unknown type name 'user'
user-defined-context
^
./version:1:5: error: expected unqualified-id
user-defined-context
^
In file included from test.cc:1:
/llvm-install/bin/../include/c++/v1/cstddef:49:9: error: no member named
'ptrdiff_t' in the global namespace
using ::ptrdiff_t;
~~^
3 errors generated.
root@cc6f61d60963:/test# /llvm-install/bin/clang++ -nostdinc++
-I/llvm-install/include/c++/v1 -I. -c test.cc -o /dev/null
root@cc6f61d60963:/test# /llvm-install/bin/clang++ -stdlib=libc++ -nostdinc++
-I/llvm-install/include/c++/v1 -I. -c test.cc -o /dev/null
clang-13: warning: argument unused during compilation: '-stdlib=libc++'
[-Wunused-command-line-argument]</pre>
</div>
</p>
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