https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95028
Bug ID: 95028
Summary: ICE in g++ (Arch Linux 9.3.0-1) 9.3.0 with captured
OMP reduce clause in lambda
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: fytch at protonmail dot com
Target Milestone: ---
Created attachment 48491
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48491&action=edit
Code that causes the ICE (same as in the comment)
Description:
GCC seems to crash when writing this OpenMP clause within a lambda. Writing the
loop outside the lambda is fine and defining the variable sum inside the lambda
is also fine but this combination seems to crash GCC.
Code:
int main() {
double sum;
const auto task = [&] {
#pragma omp parallel for reduction(+: sum)
for(int i = 0; i < 1; ++i)
sum += 1;
};
task();
}
Compiled with:
g++ main.cpp -fopenmp
Output:
during RTL pass: expand
main.cpp: In lambda function:
main.cpp:4:17: internal compiler error: in make_decl_rtl, at varasm.c:1340
4 | #pragma omp parallel for reduction(+: sum)
| ^~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.archlinux.org/> for instructions.
Output of g++ -v:
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/9.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib
--libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info
--with-pkgversion='Arch Linux 9.3.0-1'
--with-bugurl=https://bugs.archlinux.org/
--enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-shared
--enable-threads=posix --with-system-zlib --with-isl --enable-__cxa_atexit
--disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch
--disable-libssp --enable-gnu-unique-object --enable-linker-build-id
--enable-lto --enable-plugin --enable-install-libiberty
--with-linker-hash-style=gnu --enable-gnu-indirect-function --enable-multilib
--disable-werror --enable-checking=release --enable-default-pie
--enable-default-ssp --enable-cet=auto gdc_include_dir=/usr/include/dlang/gdc
Thread model: posix
gcc version 9.3.0 (Arch Linux 9.3.0-1)
