https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125137
Bug ID: 125137
Summary: `-Q --help`: cannot specify language without source
files
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: ivan.lazaric.gcc at gmail dot com
Target Milestone: ---
Suppose you wanted to find out default for -fconstexpr-ops-limit via `-Q
--help`
```
$ g++ -Q --help=c++ | grep constexpr-ops
-fconstexpr-ops-limit=<number> [available in C++, ObjC++]
```
I don't have issues with this,
the number doesn't make sense if we aren't compiling C++.
```
$ g++ foo.cpp -Q --help=c++ | grep constexpr-ops
-fconstexpr-ops-limit=<number> 33554432 bytes
```
We get the answer we were looking for, foo.cpp doesn't even need to exist.
But the following I expected to work and doesn't:
```
$ g++ -xc++ -Q --help=c++ | grep constexpr-ops
g++: fatal error: no input files
compilation terminated.
PROGRAM FAILED WITH EXIT CODE 1
```
