Retain dynamically generated reponse file for ar command during build

[gwenning-arcfield]

Description

fpm appears to generate a response file for input into the ar emulator. See sample fpm -verbose output below: ar -rs build\gfortran_4052131EE03EE371\opl\libopl.a **@build\gfortran_4052131EE03EE371\opl\libopl.a.resp** The generated file libopl.a.resp appears to be deleted at completion of the build. I would like for fpm to retain it for interrogation.

Possible Solution

No response

Additional Information

No response

[ivan-pi]

One would need to add a switch here:

https://github.com/fortran-lang/fpm/blob/1cfcaf8aeb9f428b78cfbac2a23e7a9842be65e9/src/fpm_compiler.F90#L1192

How should this be exposed to the user:

• a switch (--debug-keep-resp, -save-temp, --keep-temp)
• an environment variable, e.g. FPM_DEBUG_KEEP_RESP?
• namelist setting?