Bug#944127: gfortran-9 causes libcgns FTBFS on ppc64el
Package: gfortran-9
Severity: serious
Justification: Causes FTBFS
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Hi,
I've recently uploaded libcgns 8.4.0-1~exp1 to experimental. All builds but ppc64el are ok.
The ppc64el failure [0] occurs in the test suite (test cgread_f03), when a C va_arg function (src/cg_ftoc.c:cg_goto_f()) is called from Fortran code (src/tests/cgread_f03.F90:421). This function is called several times. Is is successful at first, then it fails badly because the corresponding hidden string length parameters[1] are equal to 0. This shouldn't happen because the related strings are literals: 'Zone_t', 'GridCoordinates_t', 'end'.
[0] https://buildd.debian.org/status/fetch.php?pkg=libcgns&arch=ppc64el&ver=3.4.0-1%7Eexp1&stamp=1572269974&raw=0
[1] https://gcc.gnu.org/onlinedocs/gfortran/Argument-passing-conventions.html
Further investigation shows that release 3.3.0-6 of libcgns FTBFS the very same way with GCC 8.3.0, while it succeeded with GCC 8.2.0 [2].
[2] https://buildd.debian.org/status/fetch.php?pkg=libcgns&arch=ppc64el&ver=3.3.0-6%2Bb2&stamp=1542797186&raw=0
I then ran a bisect on the GCC svn branch 'gcc-8-branch' and found out that the failure was introduced by the r269349 changeset [3].
[3] https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=269349
This is a backport of the trunk r268992 changetset [4] introduced during GCC-9 development.
[4] https://gcc.gnu.org/viewcvs/gcc?view=revision&revision=268992
At this point I don't know where to go. I'm setting severity = serious because this change now present into Debian/sid GCC-{7,8,9} makes libcgns FTBFS on ppc64el. Feel free to downgrade it if you think it appropriate.
Any help appreciated. Many thanks in advance,
_g.
- -- System Information:
Debian Release: buster/sid
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 4.19.0-5-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr_FR.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
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