C++11 changed from earlier versions to require space between the end of
a string literal and a macro, so that a feature can unambiguously be
added to the language. Starting in g++ 6.2, the compiler emits a
deprecation warning when there isn't a space (presumably so that future
versions can support C++11).
Although not required by the C++11 change, this patch also makes sure
there is space after a macro call, before a string literal. This makes
the macro stand out, and is easier to read.
Code and modules included with the Perl core need to be compilable using
C++. This is so that perl can be embedded in C++ programs. (Actually,
only the hdr files need to be so compilable, but it would be hard to
test that just the hdrs are compilable.) So we need to accommodate
changes to the C++ language.
dankogai
commented
8 years ago
C++11 changed from earlier versions to require space between the end of a string literal and a macro, so that a feature can unambiguously be added to the language. Starting in g++ 6.2, the compiler emits a deprecation warning when there isn't a space (presumably so that future versions can support C++11).
Although not required by the C++11 change, this patch also makes sure there is space after a macro call, before a string literal. This makes the macro stand out, and is easier to read.
Code and modules included with the Perl core need to be compilable using C++. This is so that perl can be embedded in C++ programs. (Actually, only the hdr files need to be so compilable, but it would be hard to test that just the hdrs are compilable.) So we need to accommodate changes to the C++ language.