[llvm-bugs] [Bug 139033] [aarch64] clang compile error, when compile a C file, however succeess when rename the file to cpp

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Issue	139033
Summary	[aarch64] clang compile error, when compile a C file, however succeess when rename the file to cpp
Labels	clang
Assignees
Reporter	scoutzeng

    clang version: 19.1.1
cmake version: 4.0.1
visual studio pro 17 2022
I'm going to compile a helloworld program main.c
`#include <stdio.h>
#include <arm_neon.h>

int main() {
	int64x2_t a = { 1,2 };
	const int b = 1;
	int64x2_t res = vshlq_n_s64(a, b);
	return 0;
}`
on x64 windows platform, i use `cmake  -S ../src -B . -G "Visual Studio 17 2022" -A ARM64` `cmake --build .` commands to compile, however compiler output an error `error C2057: expected constant _expression_`. After that i just change the main.c to main.cpp, then everythig is ok. I just wonder what happend? why i can't name it as a C file.

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