The following documentation describes command-line options available in all versions of the GNU assembler; see also Machine Dependent Features for options specific to particular machine architectures.
If you are invoking as using the GNU C compiler (version 2), you can use the -Wa option to pass arguments through to the assembler. The assembler arguments must be separated from each other (and the -Wa) by commas. Use the following for example.
gcc -c -g -O -Wa,-alh,-L file.c
This input emits a listing to standard output with high-level and assembly source.
Usually you do not need to use the -Wa mechanism, since many compiler command-line options are automatically passed to the assembler by the compiler. (You can call the GNU compiler driver with the -v option to see precisely what options it passes to each compilation pass, including the assembler.)
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