Hello, I am a Chinese developer.When compiling the gcc source code, I encountered a rather confusing problem, but I don't know it was a bug or not. I compile Gcc with MSYS2 on Windows, In order to output the Intel assembly file by default, I modified the gcc\config\i386\i386.opt file as follows masm= Target RejectNegative Joined Enum(asm_dialect) Var(ix86_asm_dialect) Init(ASM_INTEL) Use given assembler dialect. however, An error occurred when compiling to libgcc/config/i386/sfp-exceptions.c file, it tell me : C:\MSYS\MSYS32\tmp\cctIKXUx.s: Assembler messages: C:\MSYS\MSYS32\tmp\cctIKXUx.s:69: Error: no such instruction: `fdivs DWORD PTR [esp]' C:\MSYS\MSYS32\tmp\cctIKXUx.s:135: Error: no such instruction: `fdivs DWORD PTR [esp]' I don't known why!!