(as) Invoking

 
 2 Command-Line Options
 **********************
 
 This chapter describes command-line options available in _all_ versions
 of the GNU assembler; see  Machine Dependencies, for options
 specific to particular machine architectures.
 
    If you are invoking `as' via the GNU C compiler, 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.
 For example:
 
      gcc -c -g -O -Wa,-alh,-L file.c
 
 This passes two options to the assembler: `-alh' (emit a listing to
 standard output with high-level and assembly source) and `-L' (retain
 local symbols in the symbol table).
 
    Usually you do not need to use this `-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.)

 
* a             -a[cdghlns] enable listings
* alternate     --alternate enable alternate macro syntax
* D             -D for compatibility
* f             -f to work faster
* I             -I for .include search path
 
* K             -K for difference tables
 
* L             -L to retain local symbols
* listing       --listing-XXX to configure listing output
* M             -M or --mri to assemble in MRI compatibility mode
* MD            --MD for dependency tracking
* o             -o to name the object file
* R             -R to join data and text sections
* statistics    --statistics to see statistics about assembly
* traditional-format --traditional-format for compatible output
* v             -v to announce version
* W             -W, --no-warn, --warn, --fatal-warnings to control warnings
* Z             -Z to make object file even after errors

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