App is not installed if source is not main.f90

[aradi]

Description

I have created a generic cookiecutter template for Fortran projects offering various modern build systems as option, among others also fpm. When trying to get the same repository layout for all build systems, which differs slightly from fpm's default layout, I stumbled about a strange behavior upon app installation:

• If the app source is main.f90, everything works as expected, app installed.
• If the app source is something else (e.g. myapp.f90), an error is raised upon installation (<ERROR> Project does not contain any installable targets)
• Strange enough, if there are two programs in the app folder and one of them is in main.f90, then both apps are installed.

fpm new test
cd test
mv app/main.f90 app/myapp.f90
fpm build
fpm install --prefix $PWD/_install

Expected Behaviour

The code above should install the program myapp into _install/bin

Version of fpm

0.10.1

Platform and Architecture

Linux

Additional Information

My current workaround is to specify name and main for myapp in the [[executable]] section, but in my opinion, it should work without it out of the box.

[perazz]

Thank you for reporting this @aradi. You're stumbling upon the fact that the default auto-executables option, really has always been searching for a main.f90 rather than "any program definitions", like is reported in the documentation:

https://github.com/fortran-lang/fpm/blob/88ebb0adec1566b324616f5adcd13a51359245a0/src/fpm/manifest.f90#L45-L58

EDIT: fpm run builds and runs it just fine, so yes, there is a bug in fpm install