Bug#1134278: fortran-caffeine: FTBFS: GASNET_CC=/usr/bin/clang-21 and FPM_CC=/usr/bin/x86_64-linux-gnu-gcc-15 don't match

[Santiago Vila]

Package: src:fortran-caffeine
Version: 0.7.2-1
Severity: serious
Tags: ftbfs forky sid

Dear maintainer:

During a rebuild of all packages in unstable, this package failed to build.

Below you will find the last part of the build log (probably the most
relevant part, but not necessarily). If required, the full build log
is available here:

https://people.debian.org/~sanvila/build-logs/202604/

About the archive rebuild: The build was made on virtual machines from AWS,
using sbuild and a reduced chroot with only build-essential packages.

If you cannot reproduce the bug please contact me privately, as I
am willing to provide ssh access to a virtual machine where the bug is
fully reproducible.

If this is really a bug in one of the build-depends, please use
reassign and add an affects on src:fortran-caffeine, so that this is still
visible in the BTS web page for this package.

Thanks.

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[...]
 debian/rules clean
dh clean  # --with fortran
   debian/rules execute_before_dh_clean
make[1]: Entering directory '/<<PKGBUILDDIR>>'
rm -rf fpm.toml build*
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
   dh_clean
	rm -f debian/debhelper-build-stamp
	rm -rf debian/.debhelper/
	rm -f -- debian/libfortran-caffeine-dev.substvars debian/files
	rm -fr -- debian/libfortran-caffeine-dev/ debian/tmp/
	find .  \( \( \
		\( -path .\*/.git -o -path .\*/.svn -o -path .\*/.bzr -o -path .\*/.hg -o -path .\*/CVS -o -path .\*/.pc -o -path .\*/_darcs \) -prune -o -type f -a \
	        \( -name '#*#' -o -name '.*~' -o -name '*~' -o -name DEADJOE \
		 -o -name '*.orig' -o -name '*.rej' -o -name '*.bak' \
		 -o -name '.*.orig' -o -name .*.rej -o -name '.SUMS' \
		 -o -name TAGS -o \( -path '*/.deps/*' -a -name '*.P' \) \
		\) -exec rm -f {} + \) -o \
		\( -type d -a \( -name autom4te.cache -o -name __pycache__ \) -prune -exec rm -rf {} + \) \)
 debian/rules binary
dh binary  # --with fortran
   dh_update_autotools_config
   dh_autoreconf
   debian/rules override_dh_auto_build
make[1]: Entering directory '/<<PKGBUILDDIR>>'
for c in smp udp ibv ucx ;  do \
	b=/<<PKGBUILDDIR>>/build-gfortran-15-$c ; \
	mkdir -p  $b/lib/pkgconfig ; \
	FFLAGS=-I/usr/lib/x86_64-linux-gnu/fortran/gfortran-mod-16 ./install.sh --network=$c --prefix=$b ; \
done
PREFIX=/<<PKGBUILDDIR>>/build-gfortran-15-smp
PKG_CONFIG_PATH=/<<PKGBUILDDIR>>/build-gfortran-15-smp/lib/pkgconfig:/usr/lib/x86_64-linux-gnu/fortran/gfortran-15/pkgconfig:
GASNET_CC=/usr/bin/clang-21 and FPM_CC=/usr/bin/x86_64-linux-gnu-gcc-15 don't match
PREFIX=/<<PKGBUILDDIR>>/build-gfortran-15-udp
PKG_CONFIG_PATH=/<<PKGBUILDDIR>>/build-gfortran-15-udp/lib/pkgconfig:/usr/lib/x86_64-linux-gnu/fortran/gfortran-15/pkgconfig:
GASNET_CC=/usr/bin/clang-21 and FPM_CC=/usr/bin/x86_64-linux-gnu-gcc-15 don't match
PREFIX=/<<PKGBUILDDIR>>/build-gfortran-15-ibv
PKG_CONFIG_PATH=/<<PKGBUILDDIR>>/build-gfortran-15-ibv/lib/pkgconfig:/usr/lib/x86_64-linux-gnu/fortran/gfortran-15/pkgconfig:
GASNET_CC=/usr/bin/clang-21 and FPM_CC=/usr/bin/x86_64-linux-gnu-gcc-15 don't match
PREFIX=/<<PKGBUILDDIR>>/build-gfortran-15-ucx
PKG_CONFIG_PATH=/<<PKGBUILDDIR>>/build-gfortran-15-ucx/lib/pkgconfig:/usr/lib/x86_64-linux-gnu/fortran/gfortran-15/pkgconfig:
GASNET_CC=/usr/bin/clang-21 and FPM_CC=/usr/bin/x86_64-linux-gnu-gcc-15 don't match
make[1]: *** [debian/rules:40: override_dh_auto_build] Error 1
make[1]: Leaving directory '/<<PKGBUILDDIR>>'
make: *** [debian/rules:11: binary] Error 2
dpkg-buildpackage: error: debian/rules binary subprocess failed with exit status 2
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