Dana Jansens f6ca4ea199 Avoid a space in the UDL definition (#3610) ...

* Avoid a space in the UDL definition except on GCC before 4.9

Clang 18 has grown a warning about the space being deprecated which
is enabled by default in their nightly binaries. However GCC before 4.9
will reject the UDL definition unless there is a space there, so we need
to keep the space conditionally for it.

* Remove UDLs on GCC before 4.9 to simplify things

GCC before 4.9 rejects the syntax that is now
rejected on more modern compilers.

* Disable compile-error-test on GCC < 4.9

This avoids the UDL tests failing as GCC < 4.9 can not parse UDLs
without a space, but the space is malformed in modern compilers.

2023-09-18 08:09:42 -07:00

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fmt

Avoid a space in the UDL definition (#3610)

2023-09-18 08:09:42 -07:00