--flag doesn't override the default flags even without --profile

[rouson]

Description

fpm --help reports "--flag FFLAGS selects compile arguments for the build, the default value is set by the FPM_FFLAGS environment variable. These are added to the profile options if --profile is specified, else these options override the defaults..." But the following transcript excerpt appears to demonstrate otherwise:

fpm new hello
cd hello
fpm build --flag "-O1" --verbose

whereupon I see output that includes lines like

gfortran -c ././src/hello.f90   -O1 -fimplicit-none -Werror=implicit-interface -ffree-form -J build/gfortran_2866DEF92F2F6F01 -Ibuild/gfortran_2866DEF92F2F6F01 -o build/gfortran_2866DEF92F2F6F01/hello/src_hello.f90.o

I'm attempting to build some code that uses fixed-source form, implicit typing, and implicit interfaces. I plan to switch the code to free-source form with no implicit typing and no implicit interfaces, but I didn't write the code so I'd prefer to be able to build the code as is and write tests that will verify that my changes don't break anything. So at least initially, I'd like to override the fpm's default flags, namely -fimplicit-none -Werror=implicit-interface -ffree-form.

Expected Behaviour

I expected that passing --flag "-O1" would override the default flags.

Version of fpm

0.10.0

Platform and Architecture

macOS/Arm

Additional Information

I also tried setting FPM_FFLAGS and that didn't override the defaults either.

[rouson]

This behavior started with version 0.8.0. Version 0.7.0 behaves as expected in accordance with my interpretation of the output of fpm --help.

[perazz]

I believe you're looking for Fortran features support in fpm.toml: #864 , they were introduced in 0.8.0.

Documentation: https://fpm.fortran-lang.org/spec/manifest.html#implicit-typing

[fortran]
implicit-typing = true  # default: false
implicit-external = true  # default: false
source-form = "fixed"  # "free" (default), or "default" (compiler default)

[rouson]

@perazz thanks! I think we should also change the language in the fpm --help output.

[rouson]

PR #999 addresses this issue.

[perazz]

Thank you @rouson for the fix, if you think this issue is closed as far as you're concerned, let's close also this page soon.

[rouson]

Done.