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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Darwin when compiling in backward compatibility 10.15 -> 10.13, can't go out of box on latter"
href="https://bugs.llvm.org/show_bug.cgi?id=46533">46533</a>
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<th>Summary</th>
<td>Darwin when compiling in backward compatibility 10.15 -> 10.13, can't go out of box on latter
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>10.0
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Driver
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm@dyatkovskiy.com
</td>
</tr>
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<th>CC</th>
<td>llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=23670" name="attach_23670" title="HOST_LINK_VERSION patch">attachment 23670</a> <a href="attachment.cgi?id=23670&action=edit" title="HOST_LINK_VERSION patch">[details]</a></span>
HOST_LINK_VERSION patch
Steps to reproduce:
Build project on Mac OS X 10.15 with following cmake options:
cmake -DCMAKE_BUILD_TYPE=Release \
-DCMAKE_INSTALL_PREFIX=$PWD/install \
-DCMAKE_OSX_DEPLOYMENT_TARGET=10.13 \
-DLLVM_ENABLE_PROJECTS="clang libcxx libcxxabi" \
-G "Ninja" <path-to-llvm-project>/llvm
Then run regular build commands:
ninja
ninja install
Copy installation onto the Mac OS X 10.13 platform, and try to compile
something (you should have either CommandLineTools or XCode installed):
<installation-path>/bin/clang++ test.cpp
Compilation will fail with following errors:
ld: unknown option: -platform_version
clang-11: error: linker command failed with exit code 1 (use -v to see
invocation)
Reasons:
It happens because linker version is detected during clang compilation out of
"ld -v" command, which will return newer linker version than on 10.13.
Then during test.cpp compilation, if "-mlinker-version" is not passed, driver
will check for "HOST_LINK_VERSION" constant and will misdecide that it should
use new linker API and thus will pass unsupported parameters.
I propose to enable HOST_LINK_VERSION customization on cmake stage. Then it
would be possible to fix problem by passing "-DHOST_LINK_VERSION=409.12" on
cmake configure stage.
Please find a patch with fix in attachment.
Thanks!</pre>
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