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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - -nostdlib -rtlib=compiler_rt fails, no mechanism to link libc.so"
href="https://llvm.org/bugs/show_bug.cgi?id=25185">25185</a>
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<th>Summary</th>
<td>-nostdlib -rtlib=compiler_rt fails, no mechanism to link libc.so
</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>Linux
</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
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<th>Component</th>
<td>Driver
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>nsz@port70.net
</td>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>-rtlib is ignored after -nostdlib:
$ clang -nostdlib -rtlib=compiler-rt t.c -o t
clang-3.6: warning: argument unused during compilation: '-rtlib=compiler-rt'
$ clang --version
clang version 3.6.2 (tags/RELEASE_362/final)
Target: armv6-alpine-linux-muslgnueabihf
this makes it impossible to link libc.so which must use -nostdlib,
but has to be linked against the right compiler runtime.
there seems to be no way to discover (e.g. in a configure script) how to
link to the right clang compiler runtime (this is most likely necessary
for other freestanding code too, not just the c runtime).
(the problem persists on trunk and target independent.)
on gcc one can use either of
gcc -nostdlib t.c -lgcc
gcc -nostdlib t.c `gcc -print-file-name=libgcc.a`
clang should either accept -rtlib or needs a similar mechanism
to -print-file-name, in fact there are patches proposed along
those lines:
<a href="http://reviews.llvm.org/D10049">http://reviews.llvm.org/D10049</a>
<a href="http://reviews.llvm.org/D10050">http://reviews.llvm.org/D10050</a>
<a href="http://reviews.llvm.org/D10051">http://reviews.llvm.org/D10051</a>
<a href="http://reviews.llvm.org/D10052">http://reviews.llvm.org/D10052</a></pre>
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