llvm/autoconf/m4/define_subst.m4 - toolchain/llvm-project - Gitiles

 # Combine AC_DEFINE and AC_SUBST
 AC_DEFUN([LLVM_DEFINE_SUBST], [
 AC_DEFINE([$1], [$2], [$3])
 AC_SUBST([$1], ['$2'])
 ])
	# Combine AC_DEFINE and AC_SUBST
	AC_DEFUN([LLVM_DEFINE_SUBST], [
	AC_DEFINE([$1], [$2], [$3])
	AC_SUBST([$1], ['$2'])
	])