https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115787
Bug ID: 115787
Summary: ICE: in gimple_build_switch_nlabels, at gimple.cc:807
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: iamanonymous.cs at gmail dot com
Target Milestone: ---
Target: x86_64
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The compiler produces a segfault during gimple_build_switch_nlabels at
gimple.cc807 when compiling the provided code with the specified options.
The issue can also be reproduced on Compiler Explorer.
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OS and Platform:
# uname -a
Linux ubuntu 4.15.0-213-generic #224-Ubuntu SMP Mon Jun 19 13:30:12 UTC 2023
x86_64 x86_64 x86_64 GNU/Linux
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# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/root/gdbtest/gcc/gcc-15/libexec/gcc/x86_64-pc-linux-gnu/15.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: /root/gdbtest/gcc/obj/../gcc/configure
--prefix=/root/gdbtest/gcc/gcc-15 --enable-languages=c,c++,fortran,go
--disable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 15.0.0 20240509 (experimental) (GCC)
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Program:
# cat test035.c
__GIMPLE a(argc) {
switch (argc_20) {
case 1:
b;
}
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Command Lines:
# gcc test035.c -O2 -fdump-tree-gimple -fdump-tree-switchconv -Wall -c -o
test035.o
test035.c:1:1: error: ‘__GIMPLE’ only valid with ‘-fgimple’
1 | __GIMPLE a(argc) {
| ^~~~~~~~
test035.c:1:10: error: return type defaults to ‘int’ [-Wimplicit-int]
1 | __GIMPLE a(argc) {
| ^
test035.c: In function ‘a’:
test035.c:1:10: error: type of ‘argc’ defaults to ‘int’ [-Wimplicit-int]
test035.c:5:3: internal compiler error: in gimple_build_switch_nlabels, at
gimple.cc:807
5 | }
| ^
0x7e5713 gimple_build_switch_nlabels(unsigned int, tree_node*, tree_node*)
/root/gdbtest/gcc/obj/../gcc/gcc/gimple.cc:807
0x7e5713 gimple_build_switch_nlabels(unsigned int, tree_node*, tree_node*)
/root/gdbtest/gcc/obj/../gcc/gcc/gimple.cc:804
0xd09040 gimple_build_switch(tree_node*, tree_node*, vec<tree_node*, va_heap,
vl_ptr> const&)
/root/gdbtest/gcc/obj/../gcc/gcc/gimple.cc:827
0xa64ac1 c_parser_gimple_switch_stmt
/root/gdbtest/gcc/obj/../gcc/gcc/c/gimple-parser.cc:2552
0xa64ac1 c_parser_gimple_compound_statement
/root/gdbtest/gcc/obj/../gcc/gcc/c/gimple-parser.cc:440
0xa64d61 c_parser_parse_gimple_body(c_parser*, char*, c_declspec_il,
profile_count)
/root/gdbtest/gcc/obj/../gcc/gcc/c/gimple-parser.cc:253
0xa505a4 c_parser_declaration_or_fndef
/root/gdbtest/gcc/obj/../gcc/gcc/c/c-parser.cc:3011
0xa5af4b c_parser_external_declaration
/root/gdbtest/gcc/obj/../gcc/gcc/c/c-parser.cc:2046
0xa5b935 c_parser_translation_unit
/root/gdbtest/gcc/obj/../gcc/gcc/c/c-parser.cc:1900
0xa5b935 c_parse_file()
/root/gdbtest/gcc/obj/../gcc/gcc/c/c-parser.cc:26889
0xad3a51 c_common_parse_file()
/root/gdbtest/gcc/obj/../gcc/gcc/c-family/c-opts.cc:1311
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.
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Also ICE on trunk, compiler explorer:https://godbolt.org/z/5sYY7a47c
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