https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127465
Bug ID: 127465
Summary: internal compiler error: in
gimple_build_call_from_tree
Product: gcc
Version: 17.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: 0599jiangyc at gmail dot com
Target Milestone: ---
The following code:
```c
char *ptr[12];
t = t1 - _Literal(char *) & ptr[0];
__GIMPLE ptrdiff_t lresult (int a)
{
t = _Literal(char *) & ptr[1] - t1;
```
Resulted in this output:
```
/tmp/test.c:2:3: warning: data definition has no type or storage class
2 | t = t1 - _Literal(char *) & ptr[0];
| ^
/tmp/test.c:2:3: error: type defaults to 'int' in declaration of 't'
[-Wimplicit-int]
/tmp/test.c:2:7: error: 't1' undeclared here (not in a function); did you mean
't'?
2 | t = t1 - _Literal(char *) & ptr[0];
| ^~
| t
/tmp/test.c:2:12: error: implicit declaration of function '_Literal'
[-Wimplicit-function-declaration]
2 | t = t1 - _Literal(char *) & ptr[0];
| ^~~~~~~~
/tmp/test.c:2:21: error: expected expression before 'char'
2 | t = t1 - _Literal(char *) & ptr[0];
| ^~~~
/tmp/test.c:3:1: error: '__GIMPLE' only valid with '-fgimple'
3 | __GIMPLE ptrdiff_t lresult (int a)
| ^~~~~~~~
/tmp/test.c:3:10: error: unknown type name 'ptrdiff_t'
3 | __GIMPLE ptrdiff_t lresult (int a)
| ^~~~~~~~~
/tmp/test.c:1:1: note: 'ptrdiff_t' is defined in header '<stddef.h>'; this is
probably fixable by adding '#include <stddef.h>'
+++ |+#include <stddef.h>
1 | char *ptr[12];
/tmp/test.c: In function 'lresult':
/tmp/test.c:5:3: internal compiler error: in gimple_build_call_from_tree, at
gimple.cc:390
5 | t = _Literal(char *) & ptr[1] - t1;
| ^
0x2cb9bab internal_error(char const*, ...)
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/diagnostic-global-context.cc:787
0xcdc9e4 fancy_abort(char const*, int, char const*)
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/diagnostics/context.cc:1813
0x828657 gimple_build_call_from_tree(tree_node*, tree_node*)
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/gimple.cc:390
0xdab7e2 c_parser_gimple_statement
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c/gimple-parser.cc:947
0xdab7e2 c_parser_gimple_compound_statement
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c/gimple-parser.cc:729
0xdac85e c_parser_gimple_compound_statement
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c/gimple-parser.cc:453
0xdac85e c_parser_parse_gimple_body(c_parser*, char*, c_declspec_il,
profile_count)
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c/gimple-parser.cc:297
0xd94e6e c_parser_declaration_or_fndef
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c/c-parser.cc:3348
0xda2139 c_parser_external_declaration
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c/c-parser.cc:2256
0xda3080 c_parser_translation_unit
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c/c-parser.cc:2095
0xda3080 c_parse_file()
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c/c-parser.cc:31491
0xe28b99 c_common_parse_file()
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-src/gcc/c-family/c-opts.cc:1437
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-install/libexec/gcc/x86_64-pc-linux-gnu/17.0.0/cc1
-quiet -imultiarch x86_64-linux-gnu -D_REENTRANT /tmp/test.c -quiet -dumpdir a-
-dumpbase test.c -dumpbase-ext .c -mtune=generic -march=x86-64 -O1 -std=c99
-fsyntax-only -fstack-protector-all -fopenmp -o /dev/null
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.
```
To reproduce:
```
/home/fuzz/WorkSpace/fusion-fuzz/projects/gcc/gcc-install/bin/gcc ./test.c
```
Compiler version:
```
gcc (GCC) 17.0.0 20260917 (experimental)
Copyright (C) 2026 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
```
Commit:
```
d373724d1ddeef9b322b6b6078fc1de8dbe27791
```
Build configuration:
```
./configure --enable-languages=c,c++ --disable-bootstrap
--enable-checking=yes,extra,rtl --disable-multilib --disable-libsanitizer
--disable-nls --disable-werror
```
Operating System:
```
Ubuntu 22.04 Host, Docker fusion-fuzz-gcc:latest
```
*This bug was found by
[fusion-fuzz](https://github.com/fusion-fuzz/fusion-fuzz)*
