https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121899
Bug ID: 121899
Summary: ICE segfault on lambda with variadic parameters and
static specifier in requires clause
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: eczbek.void at gmail dot com
Target Milestone: ---
https://godbolt.org/z/EYW1EebEs
void f(auto) requires(requires { [](...) static {}; }) {}
int main() { f(0); }
Using built-in specs.
COLLECT_GCC=/opt/compiler-explorer/gcc-snapshot/bin/g++
Target: x86_64-linux-gnu
Configured with: ../gcc-trunk-20250911/configure
--prefix=/opt/compiler-explorer/gcc-build/staging
--enable-libstdcxx-backtrace=yes --build=x86_64-linux-gnu
--host=x86_64-linux-gnu --target=x86_64-linux-gnu --disable-bootstrap
--enable-multiarch --with-abi=m64 --with-multilib-list=m32,m64,mx32
--enable-multilib --enable-clocale=gnu
--enable-languages=c,c++,fortran,ada,objc,obj-c++,go,d,rust,m2,cobol
--enable-ld=yes --enable-gold=yes --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-linker-build-id --enable-lto
--enable-plugins --enable-threads=posix
--with-pkgversion=Compiler-Explorer-Build-gcc-e24a539367d439f3b62c91fd10f5ddfb350fc7ab-binutils-2.44
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 16.0.0 20250911 (experimental)
(Compiler-Explorer-Build-gcc-e24a539367d439f3b62c91fd10f5ddfb350fc7ab-binutils-2.44)
COLLECT_GCC_OPTIONS='-fdiagnostics-color=always' '-g' '-o' '/app/output.s'
'-masm=intel' '-fno-verbose-asm' '-S' '-std=c++23' '-v' '-freport-bug'
'-shared-libgcc' '-mtune=generic' '-march=x86-64' '-dumpdir' '/app/'
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/cefs/c3/c3c7a537ae37a6a5084c04f4_gcc-trunk-20250911/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/
-D_GNU_SOURCE <source> -quiet -dumpdir /app/ -dumpbase output.cpp -dumpbase-ext
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GNU C++23
(Compiler-Explorer-Build-gcc-e24a539367d439f3b62c91fd10f5ddfb350fc7ab-binutils-2.44)
version 16.0.0 20250911 (experimental) (x86_64-linux-gnu)
compiled by GNU C version 11.4.0, GMP version 6.3.0, MPFR version
4.2.2, MPC version 1.3.1, isl version isl-0.24-GMP
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring duplicate directory
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ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring duplicate directory
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ignoring duplicate directory
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ignoring nonexistent directory
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#include "..." search starts here:
#include <...> search starts here:
/cefs/c3/c3c7a537ae37a6a5084c04f4_gcc-trunk-20250911/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/../../../../include/c++/16.0.0
/cefs/c3/c3c7a537ae37a6a5084c04f4_gcc-trunk-20250911/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/../../../../include/c++/16.0.0/x86_64-linux-gnu
/cefs/c3/c3c7a537ae37a6a5084c04f4_gcc-trunk-20250911/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/../../../../include/c++/16.0.0/backward
/cefs/c3/c3c7a537ae37a6a5084c04f4_gcc-trunk-20250911/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/include
/cefs/c3/c3c7a537ae37a6a5084c04f4_gcc-trunk-20250911/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/include-fixed/x86_64-linux-gnu
/cefs/c3/c3c7a537ae37a6a5084c04f4_gcc-trunk-20250911/bin/../lib/gcc/x86_64-linux-gnu/16.0.0/include-fixed
/usr/local/include
/cefs/c3/c3c7a537ae37a6a5084c04f4_gcc-trunk-20250911/bin/../lib/gcc/../../include
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
Compiler executable checksum: c3a550a1d1e16ef272d7a10e094cc64b
<source>: In substitution of 'template<class auto:1> void f(auto:1) requires
requires{<lambda>;} [with auto:1 = int]':
required from here
<source>:2:15:
2 | int main() { f(0); }
| ~^~~
<source>:1:34: internal compiler error: Segmentation fault
1 | void f(auto) requires(requires { [](...) static {}; }) {}
| ^~~~~~~~~~~~~~~~~
0x28b4718 diagnostics::context::diagnostic_impl(rich_location*,
diagnostics::metadata const*, diagnostics::option_id, char const*,
__va_list_tag (*) [1], diagnostics::kind)
???:0
0x28a96eb internal_error(char const*, ...)
???:0
0xc41fc8 record_lambda_scope_sig_discriminator(tree_node*, tree_node*)
???:0
0xd5d12c tsubst_lambda_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0xb8e186 tsubst_requires_expr(tree_node*, tree_node*, int, tree_node*)
???:0
0xb8f618 constraints_satisfied_p(tree_node*, tree_node*)
???:0
0xd96f41 fn_type_unification(tree_node*, tree_node*, tree_node*, tree_node*
const*, unsigned int, tree_node*, unification_kind_t, int, conversion**, bool,
bool)
???:0
0xb368f9 build_new_function_call(tree_node*, vec<tree_node*, va_gc,
vl_embed>**, int)
???:0
0xdb90cc finish_call_expr(tree_node*, vec<tree_node*, va_gc, vl_embed>**, bool,
bool, int)
???:0
0xd32f13 c_parse_file()
???:0
0xea2ba9 c_common_parse_file()
???:0
Please submit a full bug report, with preprocessed source.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
Preprocessed source stored into /tmp/ccs4GhOi.out file, please attach this to
your bugreport.
Compiler returned: 1
