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cl /FA

cl /FA translation-unit.c creates an assembler listing for the translation unit.

Without further options, the generated file has the suffix .asm.

cl /FAs adds the source file text into the generated file.

cl /FAc adds machine (byte) code into the generated file. The default suffix is then .cod.

cl /FAcs adds both source file text and machine code into the compiled file.

Unlike the gnu compiler, The assembler output that is produced with /FA cannot be fed to macro assembler (ml.exe, ml64.exe), see also this stackoverflow question.

The following PowerShell script creates x86 and x64 .asm files with /FA, /FAs, /FAc and /FAu so that it's possible to diff the output.

$hostDir = (get-item ( where.exe cl.exe ) ).directory.parent.fullname

& "$hostDir\x64\cl.exe" simple-program.c /c /FA /Faoutput.x64.asm
& "$hostDir\x86\cl.exe" simple-program.c /c /FA /Faoutput.x86.asm

& "$hostDir\x64\cl.exe" simple-program.c /c /FAc /Faoutput.c.x64.asm
& "$hostDir\x86\cl.exe" simple-program.c /c /FAc /Faoutput.c.x86.asm

& "$hostDir\x64\cl.exe" simple-program.c /c /FAs /Faoutput.s.x64.asm
& "$hostDir\x86\cl.exe" simple-program.c /c /FAs /Faoutput.s.x86.asm

& "$hostDir\x64\cl.exe" simple-program.c /c /FAu /Faoutput.u.x64.asm
& "$hostDir\x86\cl.exe" simple-program.c /c /FAu /Faoutput.u.x86.asm

Github repository about-cl, path: /options/F/A/simple-program/run.ps1

#include <stdio.h>

int main() {
   printf("Hello world\n");
   return 0;
}

Github repository about-cl, path: /options/F/A/simple-program/simple-program.c

cl /FA

See also