I'm new to yocto and I am working on a custom Yocto layer (meta-deimos) and I'm trying to enable fortran support in the compiler. This is because I have a python script that requires the scipy package, which requires a fortran compiler. I successfully managed to build an image with libgfortran and gfortran support, but only after manually modifying the openembedded-core recipe gcc-13.3.inc. I am not sure if this is ideal and I'd like to do this properly via a .bbappend in my own layer (if possible). This way all my customizations are in my own dedicated layer. However when I am building the image, I get this error:
Loading cache: 100% |##########################################################################################################################| Time: 0:00:00
Loaded 4745 entries from dependency cache.
Parsing recipes: 100% |########################################################################################################################| Time: 0:00:00
Parsing of 2844 .bb files complete (2831 cached, 13 parsed). 4748 targets, 516 skipped, 2 masked, 0 errors.
NOTE: Resolving any missing task queue dependencies
WARNING: preferred version riscv of openocd not available (for item openocd)
WARNING: versions of openocd available: 0.12+git
ERROR: Nothing RPROVIDES 'libgfortran' (but /home/arrr/yocto-dev/meta-hpc-bsp/recipes-core/images/pcie-demo.bb RDEPENDS on or otherwise requires it)
nativesdk-libgfortran RPROVIDES libgfortran but was skipped: libgfortran needs fortran support to be enabled in the compiler
libgfortran was skipped: libgfortran needs fortran support to be enabled in the compiler
NOTE: Runtime target 'libgfortran' is unbuildable, removing...
Missing or unbuildable dependency chain was: ['libgfortran']
ERROR: Required build target 'pcie-demo' has no buildable providers.
Missing or unbuildable dependency chain was: ['pcie-demo', 'libgfortran']
Summary: There were 2 WARNING messages.
Summary: There were 2 ERROR messages, returning a non-zero exit code.
This is the layer structure that was created and added using the bitbake commands, and I already confirmed that it is correctly added.
meta-deimos/
├── conf
│ └── layer.conf
├── COPYING.MIT
├── README.txt
├── recipes-core
│ └── images
│ └── pcie-demo.bbappend
└── recipes-devtools
└── gcc
└── gcc_13.3.bbappend
The contents of the files are the following:
meta-deimos/conf/layer.conf
# We have a conf and classes directory, add to BBPATH
BBPATH .= ":${LAYERDIR}"
# We have recipes-* directories, add to BBFILES
BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
${LAYERDIR}/recipes-*/*/*.bbappend"
BBFILE_COLLECTIONS += "meta-deimos"
BBFILE_PATTERN_meta-deimos = "^${LAYERDIR}/"
BBFILE_PRIORITY_meta-deimos = "99"
LAYERDEPENDS_meta-deimos = "core"
LAYERSERIES_COMPAT_meta-deimos = "scarthgap"
meta-deimos/recipes-core/images/pcie-demo.bbappend
IMAGE_INSTALL:append = " \
cmake \
gfortran \
gfortran-symlinks \
libgfortran \
"
meta-deimos/recipes-devtools/gcc/gcc_13.3.bbappend
# Add gfortran (the GNU Fortran compiler)
FORTRAN = ",fortran"
What is the correct way to override or append FORTRAN in my .bbappend layer? How can I fix the error?
Thanks in advance.
Manage to make it work by adding this to build/conf/local.conf, it's a bit better as I am not touching openembedded files.
FORTRAN:forcevariable = ",fortran"