https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99164
Bug ID: 99164 Summary: gccgo internal compiler error: alias receiver Product: gcc Version: 10.2.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: go Assignee: ian at airs dot com Reporter: zoltan.halassy at gmail dot com CC: cmang at google dot com Target Milestone: --- gccgo 10.2.1 cannot handle the case when a package defines a method using a type alias. This is not a problem for `gc`. Minimal testcase: $ cat repro.go package repro type S struct{} type TA = S // SomeMethod is defined using a type alias func (TA) SomeMethod() {} $ cat main.go package main import "repro" func main() { repro.S{}.SomeMethod() } gccgo can create repro.o without showing any errors, but causes an internal compiler error when trying to build main: Output of the first command: $ gccgo -v -save-temps -Wall -Wextra -c repro.go Using built-in specs. COLLECT_GCC=gccgo OFFLOAD_TARGET_NAMES=nvptx-none:amdgcn-amdhsa:hsa OFFLOAD_TARGET_DEFAULT=1 Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Debian 10.2.1-6+build1' --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-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 --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-H1Aw7q/gcc-10-10.2.1/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-10-H1Aw7q/gcc-10-10.2.1/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 --with-build-config=bootstrap-lto-lean --enable-link-mutex Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.2.1 20210110 (Debian 10.2.1-6+build1) COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-o' 'repro.o' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/10/go1 repro.go -quiet -dumpbase repro.go -mtune=generic -march=x86-64 -auxbase-strip repro.o -Wall -Wextra -version -L/usr/lib/gcc/x86_64-linux-gnu/10 -L/usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/10/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/10/../../.. -o repro.s GNU Go (Debian 10.2.1-6+build1) version 10.2.1 20210110 (x86_64-linux-gnu) compiled by GNU C version 10.2.1 20210110, GMP version 6.2.1, MPFR version 4.1.0, MPC version 1.2.0, isl version isl-0.22.1-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU Go (Debian 10.2.1-6+build1) version 10.2.1 20210110 (x86_64-linux-gnu) compiled by GNU C version 10.2.1 20210110, GMP version 6.2.1, MPFR version 4.1.0, MPC version 1.2.0, isl version isl-0.22.1-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-o' 'repro.o' '-shared-libgcc' '-mtune=generic' '-march=x86-64' as -v --64 -o repro.o repro.s GNU assembler version 2.35.1 (x86_64-linux-gnu) using BFD version (GNU Binutils for Debian) 2.35.1 COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/10/:/usr/lib/gcc/x86_64-linux-gnu/10/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/10/:/usr/lib/gcc/x86_64-linux-gnu/ LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/10/:/usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/10/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/10/../../../:/lib/:/usr/lib/ COLLECT_GCC_OPTIONS='-v' '-save-temps' '-Wall' '-Wextra' '-c' '-o' 'repro.o' '-shared-libgcc' '-mtune=generic' '-march=x86-64' The command above succeeds (status 0), and creates repro.o but the next command fails: $ gccgo -v -save-temps -Wall -Wextra -o main repro.o main.go Using built-in specs. COLLECT_GCC=gccgo 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='Debian 10.2.1-6+build1' --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-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 --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-H1Aw7q/gcc-10-10.2.1/debian/tmp-nvptx/usr,amdgcn-amdhsa=/build/gcc-10-H1Aw7q/gcc-10-10.2.1/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 --with-build-config=bootstrap-lto-lean --enable-link-mutex Thread model: posix Supported LTO compression algorithms: zlib zstd gcc version 10.2.1 20210110 (Debian 10.2.1-6+build1) COLLECT_GCC_OPTIONS='-fsplit-stack' '-v' '-save-temps' '-Wall' '-Wextra' '-o' 'main' '-shared-libgcc' '-mtune=generic' '-march=x86-64' /usr/lib/gcc/x86_64-linux-gnu/10/go1 main.go -quiet -dumpbase main.go -mtune=generic -march=x86-64 -auxbase main -Wall -Wextra -version -fsplit-stack -L/usr/lib/gcc/x86_64-linux-gnu/10 -L/usr/lib/gcc/x86_64-linux-gnu/10/../../../x86_64-linux-gnu -L/usr/lib/gcc/x86_64-linux-gnu/10/../../../../lib -L/lib/x86_64-linux-gnu -L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/10/../../.. -o main.s GNU Go (Debian 10.2.1-6+build1) version 10.2.1 20210110 (x86_64-linux-gnu) compiled by GNU C version 10.2.1 20210110, GMP version 6.2.1, MPFR version 4.1.0, MPC version 1.2.0, isl version isl-0.22.1-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 GNU Go (Debian 10.2.1-6+build1) version 10.2.1 20210110 (x86_64-linux-gnu) compiled by GNU C version 10.2.1 20210110, GMP version 6.2.1, MPFR version 4.1.0, MPC version 1.2.0, isl version isl-0.22.1-GMP GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072 go1: internal compiler error: in add_method_declaration, at go/gofrontend/types.cc:10186 0x7fe2b4cd8d09 __libc_start_main ../csu/libc-start.c:308 Please submit a full bug report, with preprocessed source if appropriate. Please include the complete backtrace with any bug report. See <file:///usr/share/doc/gcc-10/README.Bugs> for instructions. Please note that when a type is created in package main and a type alias is used to create a method there, that compiles.