# $Id$

# Carefully crafted setup to distinguish GNU Make from Solaris Make,
# so as to be able to take advantage of the former's extensions as
# appropriate.  This setup revolves around the two implementations'
# widely different semantics for the := operator.  Specifically, GNU
# Make interprets the second line as assigning the variable is_gmake
# the value gmake=yes (with any variable references, none in this
# case, immediately expanded).  Solaris Make, however, interprets it
# as assigning the variable gmake the value yes in the context of
# building the (fictitious) is_gmake target, retaining the assignment
# of gmake=no to is_gmake.  After including this makefile, one can
# proceed to use $(is_gmake) in a computed include directive (such as
# "include $(top_srcdir)/src/build-system/Makefile.meta.$(is_gmake)").

is_gmake  = gmake=no
is_gmake := gmake=yes