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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 value of
CCASFLAGS is passed to the compilation.
You are required to set CCAS and CCASFLAGS via
configure.in. The autoconf macro AM_PROG_AS will do this
for you. Unless they are already set, it simply sets CCAS to the
C compiler and CCASFLAGS to the C compiler flags.
Only the suffixes ‘.s’ and ‘.S’ are recognized by
automake as being files containing assembly code.