https://bugs.llvm.org/show_bug.cgi?id=40870
Bug ID: 40870
Summary: clang seems limited to uint32 line numbers
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: j...@jguk.org
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
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
}
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