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Automake includes some support for assembly code.
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) are passed to the compilation.
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’ and ‘.S’ are recognized by
automake as being files containing assembly code.