GCC 10.3.0 scenarios to Compile Inline Assembly with Conditional Compilation in C++
Quick question that's been bugging me - I'm trying to debug I'm optimizing some code but I need help solving I'm trying to compile a C++ project using GCC 10.3.0 that includes some inline assembly code. The code has conditional compilation that switches between two implementations based on a compile-time flag. However, I'm working with a compilation behavior that seems related to the inline assembly block. Here's a simplified version of the code: ```cpp #include <iostream> #ifdef USE_ASM extern "C" void my_function() { asm("movl $1, %eax"); // This line causes issues } #else extern "C" void my_function() { std::cout << "Using C++ implementation" << std::endl; } #endif int main() { my_function(); return 0; } ``` When I compile this code with the flag `-DUSE_ASM`, I get the following behavior: ``` behavior: invalid operand ``` I've tried changing the assembly syntax and ensuring that the flags for the target architecture are set properly, but the behavior continues. I'm compiling for x86_64 Linux and I'm not using any specific architecture flags that I know of. The code compiles fine without the inline assembly, so I suspect it has to do with how GCC interprets the assembly within the conditional compilation. Is there a specific way to ensure that inline assembly is correctly compiled with conditional directives? I'm working on a application that needs to handle this. Has anyone else encountered this? Thanks in advance! This is my first time working with C++ 3.11. I'd be grateful for any help. I'm working with C++ in a Docker container on Ubuntu 20.04. This is happening in both development and production on Ubuntu 22.04. What's the best practice here? The project is a application built with C++. Any help would be greatly appreciated!