https://bugs.llvm.org/show_bug.cgi?id=42580
Bug ID: 42580
Summary: missed optimization leading to compiletime assert with
address sanitizer
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: a...@linaro.org
CC: htmldevelo...@gmail.com, llvm-bugs@lists.llvm.org,
neeil...@live.com, richard-l...@metafoo.co.uk
The current clang-9 prerelease causes one file in the linux kernel to get fail
compilation with an assertion triggering when building with
-sanitize=kernel-address:
void __iwl_err(char *, ...);
int a;
void iwl_fw_dbg_apply_point() {
const char b[] = "WRT ext=%d. Invalid apply point %d for %s\n";
if (a) {
void __compiletime_assert_2790(void);
if (b[sizeof(b) - 2] != '\n')
__compiletime_assert_2790();
}
__iwl_err(0, b);
}
$ clang-9 -O2 -fsanitize=kernel-address -S dbg.i -o- | grep compiletime
callq __compiletime_assert_2790
both clang-8 and gcc-8 pass the assertion here.
See also https://godbolt.org/z/cPrkv4
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