[Bug c++/105467] Dependency file produced by C++ modules causes Ninja errors

["jpakkane at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105467

--- Comment #6 from jpakkane at gmail dot com ---
According to C++ foundation's developer survey [1] the most popular build
system for C++ projects is CMake by quite a massive margin. Based on personal
experience almost everybody uses CMake's Ninja backend rather than the Make
backend on unixy platforms simply because it is so much faster 

CMake does not support modules in the Make backend [2]. Some people even claim
that properly supporting Make to build C++ modules is not possible if you want
to make it actually production quality and reliable.

Modules are very much a forward looking thing. People who still use plain Make
are most likely doing so on legacy projects that can not adopt modules in the
near future in any case.

Thus it would seem that the most probable ways C++ modules are going to be used
are a) VS projects b) whatever Xcode ends up implementing c) Ninja files.


[1] https://isocpp.org/files/papers/CppDevSurvey-2023-summary.pdf

[2] https://cmake.org/cmake/help/latest/manual/cmake-cxxmodules.7.html