https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108056
Bug ID: 108056
Summary: backward compatibility issue between 11 and 12
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libfortran
Assignee: unassigned at gcc dot gnu.org
Reporter: gilles.gouaillardet at gmail dot com
Target Milestone: ---
Created attachment 54062
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=54062&action=edit
a simple reproducer
The attached program crashes when compiled on ubuntu 22.04 (jammy) based on
debian bookworm with gfortran-11:
$ gfortran bug.f90
$ ./a.out
Internal Error: Invalid type in descriptor
Error termination. Backtrace:
#0 0x7f04aefe9ad0 in ???
#1 0x7f04aefea649 in ???
#2 0x7f04aefeae38 in ???
#3 0x7f04af22c8a4 in ???
#4 0x56490815c24e in ???
#5 0x56490815c1f3 in ???
#6 0x56490815c316 in ???
#7 0x56490815c352 in ???
#8 0x7f04aedc7d8f in __libc_start_call_main
at ../sysdeps/nptl/libc_start_call_main.h:58
#9 0x7f04aedc7e3f in __libc_start_main_impl
at ../csu/libc-start.c:392
#10 0x56490815c0c4 in ???
#11 0xffffffffffffffff in ???
After some investigations, I found gfortran-11 uses libgfortran built for
gfortran-12. I guess the fine folks at debian chose to do so since the version
library for libgfortran in 5.0.0 (from gfortran-8 up to gfortran-12, I did not
test gfortran-13) and they assume or expect ABI and semantic compatibility.
The issue can be reproduced by compiling the attached reproducer with
gfortran-11, and running it after tweaking LD_LIBRARY_PATH so it uses
libgfortran from gfortran-12.
I think there are basically two ways to see this issue:
- it should work, this is a bug in libfrotran-12
- libgfortran does not ensure such backward compatibility, and because of the
semantic change, the library version should be/have been bumped ( e.g. 5.1.0 or
6.0.0) from gfortran-12.
Once it is decided on how to move forward, I will be more than happy to report
this to the debian folks.
For the records, this issue came to my attention at
https://stackoverflow.com/questions/74738981/the-use-mpi-f08-statement-causes-fortran-mpi-programs-to-crash-on-ubuntu-22-04/74742760#74742760
