Build error: Error: Invalid type-spec (./src/M_strings.f90:9602:34) about m_strings

[urbanjost]

Unfortunately not all Programming Environments support all the standard-defined types. In this case it looks like your does not support 128-bit types. To handle this properly requires using a preprocessor in Fortran currently, which fpm(1) has not selected.
I commented out the 128-bit code as it is (hopefully) vary rarely used. The tests also use real128 so they will not run properly yet, as they use M_msg and M_verify which also support REAL128. fpm-search may pull a specific version in which case you might have to remove the version from the fpm.toml file so it pulls the latest. I am going to ponder how to best handle that, as many environments support REAL128. I might have to resort to trusting fpp/cpp is available for the Fortran compiler, which is very often true but not guaranteed. So the new one should work for you; but until fpm(1) had some way of doing conditional compilation I cannot think of a way to have my cake and eat it too.

[wiremoons]

Thank you for making the changes. I can confirm M_strings it now builds successfully!

I am still working on the original goal of building fpm-search as a similar error with REAL is also presenting itself in Fortran stdlib as well - so I guess this is going to be a general problem with the new Apple M1 CPU until it becomes more common. I hope a suitable code solution is found, and it is not arduous to have to add it.

Thanks again for your help :)