Re: [Buildroot] [PATCH] package/gcc: fortran support now requires MMU

[Julien Olivain via buildroot <buildroot@buildroot.org>]

On 13/08/2026 15:10, Thomas Petazzoni via buildroot wrote:
> Since upstream commit
> c66d1ba685b0d03b28967d2f7a48f6c64687efa2 ("Fortran: Add a shared
> memory multi process coarray implementation [PR88076]"), libgfortran
> now unconditionally uses fork(), which makes it impossible to build
> Fortran support on noMMU architectures.
> 
> In follow-up commit efb497c23a6f4109bf8794342617cbc161c08301, it was
> made even more clear: if you don't have fork() and you're not on
> WIN32:
> 
> +#else
> +#error "no way known to start child processes."
> +#endif
> 
> There are apparently no autobuilder failures for this issue, but the
> simple defconfig below allows to trigger the build failure:
> 
> BR2_arm=y
> BR2_cortex_m7=y
> BR2_GCC_VERSION_16_X=y
> BR2_TOOLCHAIN_BUILDROOT_FORTRAN=y
> 
> Even though this issue is only starting from GCC 16.x, we make Fortran
> unavailable on noMMU configurations regardless of the GCC version,
> with the reasoning that:
> 
> 1. Fortran on noMMU is unlikely to be in use
> 
> 2. Moving forward, all future versions of GCC will have this
>    restriction
> 
> Cc: Romain Naour <romain.naour@smile.fr>
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Applied to master, thanks.
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