ecbuild generates a PACKAGE_ecbuild_config.h that embeds the running kernel version. https://sources.debian.org/src/ecbuild/3.7.1-1/cmake/ecbuild_config.h.in/#L32 . Parent issue: captures_kernel_version
ecbuild generates a PACKAGE_ecbuild_config.h that contains the build flags. https://sources.debian.org/src/ecbuild/3.7.1-1/cmake/ecbuild_config.h.in/#L44-L48 . Parent issue: records_build_flags
iterates over Fortran compilers in a non-deterministic order
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