Public bug reported:
The following f90 file :
$ cat test.f90
module test
contains
function matimul(a,b)
implicit none
real(kind=4), dimension(:,:),intent(in) :: a,b
real(kind=4), dimension(size(a,1),size(b,2)) :: matimul
matimul=matmul(a,b)
end function
end module test
compiled with flags '-O2 -fexternal-blas' give the following ICE :
$ gfortran -c test.f90 -O2 -fexternal-blas -o test.o
f951: internal compiler error: in gfc_enforce_clean_symbol_state, at
fortran/symbol.c:4273
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.
It is the combination of a matmul used in a module and compiled with
both flags '-O2' and '-fexternal-blas' which trigger this error. This
error did not occur with previous gcc versions.
$ lsb_release -rd
Description: Ubuntu 19.10
Release: 19.10
$ gfortran -v
Using built-in specs.
COLLECT_GCC=gfortran
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/9/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 9.2.1-9ubuntu2'
--with-bugurl=file:///usr/share/doc/gcc-9/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,gm2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-9
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --enable-bootstrap --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-plugin --enable-default-pie --with-system-zlib
--with-target-system-zlib=auto --enable-multiarch --disable-werror
--with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --with-tune=generic --enable-offload-targets=nvptx-none,hsa
--without-cuda-driver --enable-checking=release --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu
Thread model: posix
gcc version 9.2.1 20191008 (Ubuntu 9.2.1-9ubuntu2)
** Affects: gcc-9 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1851644
Title:
ICE in gfc_enforce_clean_symbol_state, at fortran/symbol.c:4273
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