Public bug reported:
WSL2:
Ubuntu 20.04.2 LTS (GNU/Linux 5.4.72-microsoft-standard-WSL2 x86_64)
$ lsb_release -rd
Description: Ubuntu 20.04.2 LTS
Release: 20.04
$ apt-cache policy gcc-10
gcc-10:
Installed: 10.2.0-5ubuntu1~20.04
Candidate: 10.2.0-5ubuntu1~20.04
Version table:
*** 10.2.0-5ubuntu1~20.04 500
500 http://archive.ubuntu.com/ubuntu focal-updates/universe amd64
Packages
500 http://security.ubuntu.com/ubuntu focal-security/universe amd64
Packages
100 /var/lib/dpkg/status
10-20200411-0ubuntu1 500
500 http://archive.ubuntu.com/ubuntu focal/universe amd64 Packages
$ g++-10 -v
COLLECT_GCC=g++-10
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/10/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
10.2.0-5ubuntu1~20.04' --with-bugurl=file:///usr/share/doc/gcc-10/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++,m2 --prefix=/usr
--with-gcc-major-version-only --program-suffix=-10
--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-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 --enable-libphobos-checking=release
--with-target-system-zlib=auto --enable-objc-gc=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=/build/gcc-10-WJNXnb/gcc-10-10.2.0/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-10-WJNXnb/gcc-10-10.2.0/debian/tmp-gcn/usr,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
Supported LTO compression algorithms: zlib zstd
gcc version 10.2.0 (Ubuntu 10.2.0-5ubuntu1~20.04)
$ cat main.cpp
int main() {
int n;
bool arr[3][n][n] {};
if(arr[0][0][0]) {
// don't optimize this out
return 1;
}
}
$ g++-10 main.cpp
during RTL pass: expand
main.cpp: In function ‘int main()’:
main.cpp:3:7: internal compiler error: in make_decl_rtl, at varasm.c:1342
3 | bool arr[3][n][n] {};
| ^~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions.
The type of arr can be any primitive (could possibly include more types,
didn't check). arr must be initialized with brackets. At least one of
the first two dimensions of arr must be a constant, while the last
dimension must be of variable length. I've repeated this behavior with
versions 5.1.0, 6.4.0, 7.3.0, 9.2.0 on online compilers.
** Affects: gcc-10 (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1924219
Title:
internal compiler error on certain variably sized 3d arrays
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