When debugging and optimizing programs, developers sometimes need to generate and investigate into the assembly generated by the compiler. Generating a mixed source and assembly list will help a lot for debugging and optimization.
gcc can achieve this by working with the assembler.
Generate assembly list mixed with the source code
Just add these gcc compile options:
-Wa,-adhln -g
The command:
$ gcc -Wa,-adhln -g source_code.c > assembly_list.s
The options:
-g: Produce debugging information
-Wa,option: Pass option as an option to the assembler
-adhln:
a: turn on listings
d: omit debugging directives; n: omit forms processing
h: include high-level source
l: include assembly
One example
The source code:
helloworld.c:
#include <stdio.h>
int main()
{
printf("Hello world!\n");
return 0;
}
The command:
$ gcc -Wa,-adhln -g helloworld.c > helloworld.s
helloworld.s:
... »
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