https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116002
Bug ID: 116002
Summary: GCC Compiler Hang with Recursive Macros in Function
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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I encountered an issue where the GCC compiler hangs indefinitely while trying
to compile a specific piece of code involving recursive macros within a
function. The code snippet is provided below.Clang also has this problem.
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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 1.c
int a(int c) {
if (c < 12345) {
#define A \
{ int d = c % 12345; \
int e = c ^ d * 12345; \
int f = c * d % e % 12345; \
c = f; }
#define B A A A A A A
#define C B B B B B B
#define D C C C C C C
#define E D D D D D D
E E E E E
}
return c;
}
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Output: Nothing (Waited for nearly 300 seconds.
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Also got killed on compiler explorer:https://godbolt.org/z/9Exof1rrW
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