https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99736
Bug ID: 99736
Summary: Statement expression (gcc extension) cannot return
struct with variable length array
Product: gcc
Version: 9.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: tunagul29 at icloud dot com
Target Milestone: ---
Created attachment 50463
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=50463&action=edit
C file which contains the bug
Statement Expressions cannot return an anonymous struct with variable length
array object. I attached the file but here is the bug:
"""
int main() {
({
unsigned int length = 10;
struct {
int array[length];
} new_object;
new_object;
});
}
"""
I conpiled it with mingcw and gcc 9.3 on wsl, both failed.
I am using gcc 9.3.0 wich gives the output:
"""
test2.c: In function ‘main’:
test2.c:7:3: internal compiler error: in gimplify_var_or_parm_decl, at
gimplify.c:2755
7 | ({
| ~^
8 | unsigned int length = foo();
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 | struct {
| ~~~~~~~~
10 | int array[length];
| ~~~~~~~~~~~~~~~~~~
11 | } new_object;
| ~~~~~~~~~~~~~
12 | new_object;
| ~~~~~~~~~~~
13 | });
| ~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-9/README.Bugs> for instructions.
"""
with -Wall and -Wextra flags.
gcc -v output:
"""
Using built-in specs.
COLLECT_GCC=gcc
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
9.3.0-17ubuntu1~20.04' --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-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-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-9-HskZEa/gcc-9-9.3.0/debian/tmp-nvptx/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
gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)
"""
