(automake-1.16.info)Assembly Support

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8.13 Assembly Support
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Automake includes some support for assembly code.  There are two forms
of assembler files: normal (‘*.s’) and preprocessed by ‘CPP’ (‘*.S’ or
‘*.sx’).

   The variable ‘CCAS’ holds the name of the compiler used to build
assembly code.  This compiler must work a bit like a C compiler; in
particular it must accept ‘-c’ and ‘-o’.  The values of ‘CCASFLAGS’ and
‘AM_CCASFLAGS’ (or its per-target definition) is passed to the
compilation.  For preprocessed files, ‘DEFS’, ‘DEFAULT_INCLUDES’,
‘INCLUDES’, ‘CPPFLAGS’ and ‘AM_CPPFLAGS’ are also used.

   The autoconf macro ‘AM_PROG_AS’ will define ‘CCAS’ and ‘CCASFLAGS’
for you (unless they are already set, it simply sets ‘CCAS’ to the C
compiler and ‘CCASFLAGS’ to the C compiler flags), but you are free to
define these variables by other means.

   Only the suffixes ‘.s’, ‘.S’, and ‘.sx’ are recognized by ‘automake’
as being files containing assembly code.