[Bug lto/100010] New: ICE in lto_output_node, at lto-cgraph.c:447 (-fdevirtualize-at-ltrans)
alex.miller at gmx dot de
gcc-bugzilla@gcc.gnu.org
Sat Apr 10 01:36:42 GMT 2021
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100010
Bug ID: 100010
Summary: ICE in lto_output_node, at lto-cgraph.c:447
(-fdevirtualize-at-ltrans)
Product: gcc
Version: 10.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: alex.miller at gmx dot de
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Building lcdf-typetools-2.108 fails with an ICE while linking the mmafm tool
(with gcc-10 using the flags "-O3 -flto -fdevirtualize-at-ltrans").
Here's a reduced sample that reproduces the issue (even with -O2):
---
struct String {
String(char);
~String();
};
struct ErrorHandler {
virtual String decorate(const String &);
};
String ErrorHandler::decorate(const String &str) {
decorate(str);
return 0;
}
struct LandmarkErrorHandler : ErrorHandler {
String _landmark;
LandmarkErrorHandler();
String decorate(const String &);
};
String LandmarkErrorHandler::decorate(const String &) {
return ErrorHandler::decorate(0);
}
struct Charstring {
virtual ~Charstring();
virtual void process() = 0;
} *interpret_cs;
Charstring::~Charstring() {}
struct : Charstring {
void process() {}
} _cdv;
int main() {
LandmarkErrorHandler();
interpret_cs->process();
}
---
$ g++ -O2 -flto -fdevirtualize-at-ltrans a.cc
during IPA pass: static-var
lto1: internal compiler error: in lto_output_node, at lto-cgraph.c:447
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.gentoo.org/> for instructions.
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/usr/lib/gcc/x86_64-pc-linux-gnu/10.2.0/../../../../x86_64-pc-linux-gnu/bin/ld:
error: lto-wrapper failed
collect2: error: ld returned 1 exit status
Reducing the sources seems a bit brittle, like often with LTO:
* Combining all sources in a single file changed the error message to
"lto1: internal compiler error: Segmentation fault", but minimizing made
the error location reappear. The result is very similar to a multi-file
reduction.
* Reduced sample fails with -O2, full sources need -O3.
* With g++-9.3.0 the reduced sample doesn't trigger the ICE, but the original
sources do (at lto-cgraph.c:453).
Let me know if you need another sample.
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