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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - clang seems limited to uint32 line numbers"
href="https://bugs.llvm.org/show_bug.cgi?id=40870">40870</a>
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<th>Summary</th>
<td>clang seems limited to uint32 line numbers
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
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<th>OS</th>
<td>Linux
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<th>Status</th>
<td>NEW
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
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<th>Component</th>
<td>-New Bugs
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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<th>Reporter</th>
<td>jg@jguk.org
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<th>CC</th>
<td>htmldeveloper@gmail.com, llvm-bugs@lists.llvm.org, neeilans@live.com, richard-llvm@metafoo.co.uk
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<pre>Two parts of #line numbers have an issue. So I am filing together.
1) clang seems limited to uint32 line numbers
and then wraparound back to 0 even !
I know many people won't ever encounter this, but good to define it.
Better to change it to 64bit?
If there must be a limit, better to change "directive requires a positive
integer argument" to show the limit
Also better to fix it on the line limit? 4294967295
ie ""directive requires a positive integer argument 1 - 4294967295"
2) #line 0 is not allowed by C spec, but Clang allows it
int main(void)
{
#line 0
#warning msg1
}
from godbolt.org
#1 with x86-64 clang (trunk)
<source>:4294967295:6: warning: msg1 [-W#warnings]
#warning msg1
^
<source>:0:8: error: #line directive requires a positive integer argument
#line 4294967296
^
<source>:1:6: warning: msg2 [-W#warnings]
#warning msg2
^
2 warnings and 1 error generated.
Compiler returned: 1
int main(void)
{
#line 4294967295
#warning msg1
#line 4294967296
#warning msg2
}</pre>
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