<html>
<head>
<base href="https://bugs.llvm.org/">
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - check-builtins fails on musl libc system"
href="https://bugs.llvm.org/show_bug.cgi?id=46628">46628</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>check-builtins fails on musl libc system
</td>
</tr>
<tr>
<th>Product</th>
<td>compiler-rt
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</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>builtins
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>p.waydan@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23699" name="attach_23699" title="Patch to disable glibc check when using musl">attachment 23699</a> <a href="attachment.cgi?id=23699&action=edit" title="Patch to disable glibc check when using musl">[details]</a></span>
Patch to disable glibc check when using musl
I am cross-compiling the compiler-rt builtins for armv6m on an Alpine Linux
docker image following the
<a href="https://llvm.org/docs/HowToCrossCompileBuiltinsOnArm.html">https://llvm.org/docs/HowToCrossCompileBuiltinsOnArm.html</a> guide. The builtins
compile and link successfully but running `ninja check-builtins` emits the
following error:
llvm-lit:
/tmp/llvm-project/build-rt/bin/../../llvm/utils/lit/lit/TestingConfig.py:99:
fatal: unable to parse config file
'/tmp/llvm-project/compiler-rt/test/lit.common.cfg.py', traceback: Traceback
(most recent call last):
File
"/tmp/llvm-project/build-rt/bin/../../llvm/utils/lit/lit/TestingConfig.py",
line 88, in load_from_path
exec(compile(data, path, 'exec'), cfg_globals, None)
File "/tmp/llvm-project/compiler-rt/test/lit.common.cfg.py", line 398, in
<module>
ver_line = sout.splitlines()[0]
IndexError: list index out of range
I ran lines 394:397 from compiler-rt/test/lit.common.cfg.py by hand and found
that `sout` is an empty string which explains the IndexError. I tried running
`ldd --version` in the terminal, but this command does not exist for the musl
ldd (ld-musl-x86_64.so.1) and output goes to stderr instead of stdout.
I found a workaround to this problem by adding a guard before `ver_line =
sout.splitlines()[0]` to check that the length of sout is greater than zero.
Please see the attached patch.
Cmake options are as follows:
cmake -GNinja ../compiler-rt \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_TRY_COMPILE_TARGET_TYPE=STATIC_LIBRARY \
-DCOMPILER_RT_OS_DIR="baremetal" \
-DCOMPILER_RT_BUILD_BUILTINS=ON \
-DCOMPILER_RT_BUILD_SANITIZERS=OFF \
-DCOMPILER_RT_BUILD_XRAY=OFF \
-DCOMPILER_RT_BUILD_LIBFUZZER=OFF \
-DCOMPILER_RT_BUILD_PROFILE=OFF \
-DCMAKE_C_COMPILER=/usr/bin/clang \
-DCMAKE_C_COMPILER_TARGET="armv6m-none-eabi" \
-DCMAKE_ASM_COMPILER_TARGET="armv6m-none-eabi" \
-DCMAKE_AR=/usr/bin/llvm-ar \
-DCMAKE_NM=/usr/bin/llvm-nm \
-DCMAKE_RANLIB=/usr/bin/llvm-ranlib \
-DCOMPILER_RT_BAREMETAL_BUILD=ON \
-DCOMPILER_RT_DEFAULT_TARGET_ONLY=ON \
-DCMAKE_C_FLAGS="-I/tmp/gcc-arm-none-eabi-9-2020-q2-update/arm-none-eabi/include
--target=armv6-none-eabi" \
-DCMAKE_EXE_LINKER_FLAGS="-fuse-ld=lld" \
-DCMAKE_ASM_FLAGS="" \
-DLLVM_CONFIG_PATH=/usr/bin/llvm-config \
-DLLVM_MAIN_SRC_DIR="../llvm" \
-DCOMPILER_RT_EMULATOR="qemu-arm -L
/tmp/gcc-arm-8.2-2019.01-x86_64-arm-linux-gnueabi/arm-linux-gnueabi/libc" \
-DCOMPILER_RT_INCLUDE_TESTS=ON \
-DCOMPILER_RT_TEST_COMPILER=/usr/bin/clang \
-DCOMPILER_RT_TEST_COMPILER_CFLAGS="--target=arm-linux-gnueabi -march=armv7a
-mthumb -mfloat-abi=soft -mfpu=none -fuse-ld=lld \
--sysroot=/tmp/gcc-arm-8.2-2019.01-x86_64-arm-linux-gnueabi/arm-linux-gnueabi/libc
\
--gcc-toolchain=/tmp/gcc-arm-8.2-2019.01-x86_64-arm-linux-gnueabi"</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>