https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117331
Bug ID: 117331
Summary: constexpr with "long double" fails on ppc64el
Product: gcc
Version: 14.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: dev at umlaeute dot mur.at
Target Milestone: ---
Created attachment 59474
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=59474&action=edit
output of "g++ -save-temps -o test.o test.cpp"
I'm trying to build some software for Debian's ppc64el architeture (aka
powerpc64le), and it miserably fails:
```
$ g++ --version
g++ (Debian 14.2.0-7) 14.2.0
```
It seems the culprit is a `constexpr` with `long double`.
E.g. a simple file with these contents:
```C++
void test() {
constexpr auto oneThird = ((long double) 1)/ ((long double) 3);
}
```
fails to compile when built with the following error:
```
$ g++ -save-temps -o test.o test.cpp
test.cpp: In instantiation of 'T test() [with T = long double]':
test.cpp:9:19: required from here
9 | test<long double>();
| ~~~~~~~~~~~~~~~~~^~
test.cpp:4:34: error: '(1.0e+0l / 3.0e+0l)' is not a constant expression
4 | constexpr auto oneThird = one / (T) 3;
| ~~~~^~~~~~~
```
(The produced `test.ii` file is attached to this bug-report).
According to godbolt, gcc fails on any powerpc architecture, but succeeds with
"others" (I have only tried common ones, like x86_64).
It seems that clang (as per godbolt) can compile the code on powerpc64le just
fine.
