libcmatrix/configure-compiler.ac at main · dch0ph/libcmatrix · GitHub

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if test -z "$CXXFLAGS"; then
	DEFCXXFLAGS=
else
	DEFCXXFLAGS=$CXXFLAGS
fi

DEFMTFLAGS=
DEFOPTFLAGS="-O2"

AC_PROG_CXX
AC_LANG([C++])

if test x$ac_cv_cxx_compiler_gnu = xyes; then
	if test -z "$SSEFLAGS"; then
		SSEFLAGS="-msse3 -mfpmath=sse"
	fi
	AC_DEFINE(HAVE_ISFINITE)
	CXXFLAGS="$DEFCXXFLAGS -Wall -Wno-sign-compare"
	AC_CANONICAL_HOST
	case $host_os in
		*cygwin* ) CPPFLAGS="$CPPFLAGS -mno-cygwin";;
	esac
fi

if test -z "$MTFLAGS"; then
	MTFLAGS=$DEFMTFLAGS
fi

AC_ARG_WITH(sse,
	AS_HELP_STRING([--with-sse],[enable use of SSE3 instructions for complex arithmetic (default=no)]),,with_sse=no)
if test x$with_sse = xyes; then
	if test -z "$SSEFLAGS"; then
		AC_MSG_FAILURE([--with-sse specified, but don't know how to enable SSE3 for compiler (set SSEFLAGS)])
	else
		CPPFLAGS="$CPPFLAGS $SSEFLAGS"
		AC_DEFINE(LCM_USE_SSECOMPLEX)
		AC_DEFINE(LCM_NEED_128BIT_ALIGN)
	fi
fi

if test -z "$OPTFLAGS"; then
	OPTFLAGS=$DEFOPTFLAGS
fi