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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Clang error "file not found" on include files when building with modules"
href="https://bugs.llvm.org/show_bug.cgi?id=51395">51395</a>
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<th>Summary</th>
<td>Clang error "file not found" on include files when building with modules
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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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>All
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Modules
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>akhuang@google.com
</td>
</tr>
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<th>CC</th>
<td>dgregor@apple.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>We saw this "file not found" error when trying to build with -fmodules. This
only happens when we use relative paths in the header search.
To repro:
$ cat t.cc
#include <cstddef>
$ ./<relative-path-to-clang>/clang -fmodules -nostdinc++ -no-canonical-prefixes
-isystem../../llvm-build/include/c++/v1 -E t.cc
# 1 "t.cc"
# 1 "<built-in>" 1
# 1 "<built-in>" 3
# 385 "<built-in>" 3
# 1 "<command line>" 1
# 1 "<built-in>" 2
# 1 "t.cc" 2
<module-includes>:23:10: fatal error:
'../../llvm-build/lib/clang/14.0.0/include/stdint.h' file not found
#include "../../llvm-build/lib/clang/14.0.0/include/stdint.h"
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
t.cc:1:10: fatal error: could not build module 'std'
#include <cstddef>
~~~~~~~~^
(also, to repro, I had to remove a line `header "range"` from <build
dir>/include/c++/v1/module.modulemap to get the build to work)</pre>
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