Bug#1013316: early transition to gcc-12 breaks src:pcl on armhf/el

[Jochen Sprickerhof]

Package: dh-fortran-mod
Version: 0.23
Severity: normal

Hi Alastair,

could you revert the transition to gcc-12 for now and do it in parallel
with gcc switching to it by default?

Background:

src:pcl uses clang on armhf/el because it does not compile with gcc.
pcl build depends on libopenmpi-dev (through libvtk9-dev) and with this
libgcc-12-dev is pulled in (libopenmpi-dev -> gfortran-12 -> gcc-12 ->
libgcc-12-dev). But with libgcc-12-dev installed, clang expects to use
it and also needs libstdc++-12-dev which is not pulled in:

root@fenchel:/# echo "int main() {}" > broken.cpp
root@fenchel:/# clang++ broken.cpp
root@fenchel:/# apt install libgcc-12-dev
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
The following NEW packages will be installed:
libgcc-12-dev
0 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 2436 kB of archives.
After this operation, 14.6 MB of additional disk space will be used.
Get:1 http://deb.debian.org/debian unstable/main amd64 libgcc-12-dev amd64 12.1.0-4 [2436 kB]
Fetched 2436 kB in 3s (752 kB/s)
debconf: delaying package configuration, since apt-utils is not installed
Selecting previously unselected package libgcc-12-dev:amd64.
(Reading database ... 17811 files and directories currently installed.)
Preparing to unpack .../libgcc-12-dev_12.1.0-4_amd64.deb ...
Unpacking libgcc-12-dev:amd64 (12.1.0-4) ...
Setting up libgcc-12-dev:amd64 (12.1.0-4) ...
Processing triggers for ccache (4.6.1-1) ...
Updating symlinks in /usr/lib/ccache ...
root@fenchel:/# clang++ broken.cpp
/usr/bin/ld: cannot find -lstdc++: No such file or directory
clang: error: linker command failed with exit code 1 (use -v to see invocation)

As a result src:pcl currently fails to build on armhf/el. This is
unfortunate cause it blocks the onetbb transition. I talked to ginggs in
IRC and he proposed to revert the gcc-12 switch of dh-fortran-mod.

Cheers Jochen


-- System Information:
Debian Release: bookworm/sid
APT prefers unstable
APT policy: (500, 'unstable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.18.0-2-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages dh-fortran-mod depends on:
ii debhelper 13.7.1
ii gfortran-12 12.1.0-4
ii libfile-libmagic-perl 1.23-1+b2
ii perl [libio-compress-perl] 5.34.0-4

dh-fortran-mod recommends no packages.

dh-fortran-mod suggests no packages.

-- no debconf information

[Alastair McKinstry]

Hi Jochen

Ok, the change is rolled back.

Ideally this is a non-invasive change - it just causes mod files to be
created for both gfortran-11 and gfortran-12 but reality happens; it can
wait.

Best regards

Alastair

--
Alastair McKinstry,
GPG: 82383CE9165B347C787081A2CBE6BB4E5D9AD3A5
ph: +353 87 6847928 e: alas...@sceal.ie, im: @sceal.ie:mckinstry

[Graham Inggs]

Control: severity -1 serious
Control: tags -1 + ftbfs
Control: affects -1 + src:pcl

Where was this rolled back?