[Bug 246700] [exp-run] Update GCC_DEFAULT from 9 to 10

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246700

Mark Linimon <linimon at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pkubaj at FreeBSD.org

--- Comment #7 from Mark Linimon <linimon at FreeBSD.org> ---
I have done some preliminary testing on powerpc64 on my own machine (well,
with gcc10-devel, but I do not believe there will be any difference).

So far there are two failure modes.  There are several ports with the first
but only one so far with the second.

from 2020-06-01_02h55m13s/logs/errors/dvdisaster-0.79.5_1.log:

  Compiling: udf.c
  Compiling: welcome-window.c
  Linking  : dvdisaster
  /usr/local/bin/ld:
/wrkdirs/usr/ports/sysutils/dvdisaster/work/dvdisaster-0.79.5/build.o:(.data+0x0):
multiple definition of `buildCount';
/wrkdirs/usr/ports/sysutils/dvdisaster/work/dvdisaster-0.79.5/bitmap.o:(.bss+0x0):
first defined here
  /usr/local/bin/ld:
/wrkdirs/usr/ports/sysutils/dvdisaster/work/dvdisaster-0.79.5/cacheprobe.o:(.bss+0x0):
multiple definition of `buildCount';
/wrkdirs/usr/ports/sysutils/dvdisaster/work/dvdisaster-0.79.5/bitmap.o:(.bss+0x0):
first defined here

  [and so on for 280 more lines]

from 2020-06-02_01h35m26s/logs/errors/mpich-3.2.1_6.log:

  checking whether Fortran 77 compiler processes .F files with C
preprocessor... yes
  checking whether gfortran10 allows mismatched arguments... no
  configure: error: The Fortran compiler gfortran10 will not compile files that
call the same routine with arguments of different types.
  ===>  Script "configure" failed unexpectedly.

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