https://gcc.gnu.org/bugzilla/show_bug.cgi?id=123110
Bug ID: 123110
Summary: [16 Regression] ICE: verify_flow_info failed: EH
landing pad label '({anonymous})' is not first in a
sequence of labels in bb 10 with -Os -fexceptions
-finstrument-functions-once
Product: gcc
Version: 16.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: middle-end
Assignee: unassigned at gcc dot gnu.org
Reporter: zsojka at seznam dot cz
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Created attachment 63048
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=63048&action=edit
reduced testcase
Compiler output:
$ x86_64-pc-linux-gnu-gcc -Os -fexceptions -finstrument-functions-once
testcase.c
testcase.c: In function 'foo':
testcase.c:24:1: error: EH landing pad label '({anonymous})' is not first in a
sequence of labels in bb 10
24 | }
| ^
during GIMPLE pass: ccp
testcase.c:24:1: internal compiler error: verify_flow_info failed
0x2c9807d internal_error(char const*, ...)
/repo/gcc-trunk/gcc/diagnostic-global-context.cc:787
0x1012dbe verify_flow_info()
/repo/gcc-trunk/gcc/cfghooks.cc:287
0x168abd4 checking_verify_flow_info()
/repo/gcc-trunk/gcc/cfghooks.h:214
0x168abd4 cleanup_tree_cfg_noloop
/repo/gcc-trunk/gcc/tree-cfgcleanup.cc:1251
0x168abd4 cleanup_tree_cfg(unsigned int)
/repo/gcc-trunk/gcc/tree-cfgcleanup.cc:1302
0x14cebcc execute_function_todo
/repo/gcc-trunk/gcc/passes.cc:2066
0x14cf147 execute_todo
/repo/gcc-trunk/gcc/passes.cc:2149
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$ x86_64-pc-linux-gnu-gcc -v
Using built-in specs.
COLLECT_GCC=/repo/gcc-trunk/binary-latest/bin/x86_64-pc-linux-gnu-gcc
COLLECT_LTO_WRAPPER=/repo/gcc-trunk/binary-trunk-20251211040344-r16-6021-gd9e2605d9bfa24-checking-yes-rtl-df-extra-nobootstrap-amd64/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--disable-bootstrap --build=x86_64-pc-linux-gnu --host=x86_64-pc-linux-gnu
--target=x86_64-pc-linux-gnu --with-ld=/usr/bin/x86_64-pc-linux-gnu-ld
--with-as=/usr/bin/x86_64-pc-linux-gnu-as --enable-libsanitizer
--disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-20251211040344-r16-6021-gd9e2605d9bfa24-checking-yes-rtl-df-extra-nobootstrap-amd64
Thread model: posix
Supported LTO compression algorithms: zlib zstd
gcc version 16.0.0 20251211 (experimental) (GCC)
