https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91740
Bug ID: 91740
Summary: ICE in fold_convert_loc, at fold-const.c:2429
Product: gcc
Version: 9.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: julien at vivenot dot fr
Target Milestone: ---
The following causes an internal compiler error on gcc 9.2.0 on x86-64.
I do not have access to other versions myself but tested on godbolt: It seems
to say that 9.1, 9.2 and current trunk are affected, while 8.3 is unaffected.
$ cat test.cpp
constexpr bool f(const char*) { return true; }
template<typename T> const char c = "FOO"[f("BAR") ? 1 : 0];
$ g++ test.cpp
test.cpp:2:59: internal compiler error: in fold_convert_loc, at
fold-const.c:2429
2 | template<typename T> const char c = "FOO"[f("BAR") ? 1 : 0];
| ^
The current code is obviously meaningless because it has been slowly scaled
down from production code.
I have noted that any of the following changes make the issue disappear :
- removing the argument to f()
- removing the templatization
- removing the ternary operator
