http://llvm.org/bugs/show_bug.cgi?id=22456
Bug ID: 22456
Summary: LTO build-time crash when building at -O2 -g
Product: tools
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: lto
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
The following "test.cpp" (along with the stub "alpha.cpp", for completeness)
gets a crash at build-time during LTO, when both -O2 and -g are used.
Tested with r228115. Target: x86_64-unknown-linux-gnu
// ================ test.cpp =================
float alpha();
struct Bravo {
Bravo(float) {}
};
struct Charlie {
Charlie(Bravo delta) { echo(0, 0); }
void echo(Bravo, float) { alpha(); }
};
void foxtrot(Bravo) { Charlie(Bravo(0)); }
int main(){}
// ===========================================
// ================ alpha.cpp ================
float alpha() { return 0.0f; }
// ===========================================
$ clang++ -c -O2 -g -flto alpha.cpp test.cpp
$ clang++ -o tst.x -flto alpha.o test.o
All nodes should be resolved!
<0x29f3a68>
LLVM ERROR: Broken function found, compilation aborted!
clang: error: linker command failed with exit code 1 (use -v to see invocation)
$
The build succeeds if either the optimization level is dropped to -O1, or -g
is removed.
Bisecting it indicates that it began failing with r226736.
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