https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87372
Bug ID: 87372
Summary: __PRETTY_FUNCTION__ not constexpr in gcc trunk on
compiler explorer
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: eric-bugs at omnifarious dot org
Target Milestone: ---
This code will not compile with gcc trunk on compiler explorer. But it works
with gcc 8.2 on that some site. I'm worried this is a regression in current C++
development.
constexpr int zstrlen(char const *s)
{
int i = 0;
while (s[i]) ++i;
return i;
}
int joe()
{
constexpr char const * const foo = __PRETTY_FUNCTION__;
constexpr int foolen = zstrlen(foo);
return foolen;
}
It fails to work because __PRETTY_FUNCTION__ isn't constexpr in gcc trunk. I
get this error message:
<source>: In function 'int joe()':
<source>:11:35: in 'constexpr' expansion of 'zstrlen(((const char*)foo))'
<source>:11:39: error: the value of '__PRETTY_FUNCTION__' is not usable in a
constant expression
11 | constexpr int foolen = zstrlen(foo);
| ^
<source>:10:40: note: '__PRETTY_FUNCTION__' was not declared 'constexpr'
10 | constexpr char const * const foo = __PRETTY_FUNCTION__;
| ^~~~~~~~~~~~~~~~~~~
Compiler returned: 1
Here is a link:
https://godbolt.org/z/8IdAae
