Add a "system features" framework that will eventually be used to

automatically supply missing "basic" headers and libraries from an
older system, e.g. IRIX 5.x or Interix or AIX, etc.

Example usage:

    USE_FEATURES+=      snprintf glob regex

For now, we just pull in libnbcompat to supply the missing bits.

2 files changed, 132 insertions, 0 deletions

diff --git a/mk/features/features-vars.mk b/mk/features/features-vars.mk
new file mode 100644
index 00000000000..bed2d0b7fac
--- /dev/null
+++ b/mk/features/features-vars.mk
@@ -0,0 +1,82 @@
+# $NetBSD: features-vars.mk,v 1.1 2007/09/07 21:55:46 jlam Exp $
+#
+# This file is include by bsd.prefs.mk.
+#
+# Package-settable variables:
+#
+# USE_FEATURES
+#	Lists the system features required by the package.
+#
+#	Default value: undefined
+#
+# Variables defined by this file:
+#
+# MISSING_FEATURES
+#	The features listed in USE_FEATURES that are missing on the
+#	current system.  Also includes "inet6" if the system doesn't
+#	support IPv6.
+#
+
+MISSING_FEATURES=	# empty
+
+#
+#	Handle "inet6" feature specially -- we always add it to
+#	MISSING_FEATURES if the operating system doesn't support IPv6,
+#	regardless of whether or not "inet6" is a requested feature
+#	in USE_FEATURES.
+#
+.if defined(_OPSYS_HAS_INET6) && empty(_OPSYS_HAS_INET6:M[nN][oO])
+MISSING_FEATURES+=	inet6
+.endif
+
+.for _feature_ in err warn
+.  if defined(USE_FEATURES) && !empty(USE_FEATURES:M${_feature_})
+.    if (${OPSYS} != NetBSD) && (${OPSYS} != FreeBSD) && (${OPSYS} != DragonFly)
+MISSING_FEATURES+=	${_feature_}
+.    endif
+.  endif
+.endfor
+
+.if defined(USE_FEATURES) && !empty(USE_FEATURES:Mgetopt_long)
+.  if !exists(/usr/include/getopt.h)
+MISSING_FEATURES+=	getopt_long
+.  endif
+.endif
+
+.for _feature_ in getprogname setprogname
+.  if defined(USE_FEATURES) && !empty(USE_FEATURES:M${_feature_})
+.    if (${OPSYS} != NetBSD) && (${OPSYS} != FreeBSD) && (${OPSYS} != DragonFly)
+MISSING_FEATURES+=	${_feature_}
+.    endif
+.  endif
+.endfor
+
+.if defined(USE_FEATURES) && !empty(USE_FEATURES:Mglob)
+.  if !exists(/usr/include/glob.h)
+MISSING_FEATURES+=	glob
+.  endif
+.endif
+
+.if defined(USE_FEATURES) && !empty(USE_FEATURES:Mregex)
+.  if !exists(/usr/include/regex.h)
+MISSING_FEATURES+=	regex
+.  endif
+.endif
+
+.for _feature_ in snprintf vsnprintf
+.  if defined(USE_FEATURES) && !empty(USE_FEATURES:M${_feature_})
+.    if !empty(LOWER_OPSYS:Mirix5*)
+MISSING_FEATURES+=	snprintf
+.    endif
+.  endif
+.endfor
+
+.if defined(USE_FEATURES) && !empty(USE_FEATURES:Mutimes)
+.  if ${OPSYS} == "Interix"
+MISSING_FEATURES+=	utimes
+.  endif
+.endif
+
+.if defined(USE_FEATURES) && !empty(USE_FEATURES:Mnbcompat)
+MISSING_FEATURES+=	nbcompat
+.endif
diff --git a/mk/features/features.mk b/mk/features/features.mk
new file mode 100644
index 00000000000..37f8795dad1
--- /dev/null
+++ b/mk/features/features.mk
@@ -0,0 +1,50 @@
+# $NetBSD: features.mk,v 1.1 2007/09/07 21:55:47 jlam Exp $
+#
+# This file is included by bsd.pkg.mk.
+#
+# Variables defined by this file:
+#
+# FEATURE_CPPFLAGS
+# FEATURE_LDFLAGS
+# FEATURE_LIBS
+#	Preprocessor and linker flags needed to build and to link against
+#	the headers and libraries that supply the features missing from
+#	the system.
+#
+
+.if defined(MISSING_FEATURES)
+#
+#	Handle "inet6" feature specially -- "inet6" could be in
+#	MISSING_FEATURES even though it's not requested in USE_FEATURES
+#	so check that it appears in both before failing the package
+#	build.
+#
+.  if defined(USE_FEATURES) && !empty(USE_FEATURES:Minet6)
+.    if !empty(MISSING_FEATURES:Minet6)
+PKG_FAIL_REASON+=	"${PKGNAME} requires IPv6 support"
+.    endif
+.  endif
+
+FEATURE_CPPFLAGS=	# empty
+FEATURE_LDFLAGS=	# empty
+FEATURE_LIBS=		# empty
+
+.  if !empty(MISSING_FEATURES:Merr) || \
+      !empty(MISSING_FEATURES:Mgetopt_long) || \
+      !empty(MISSING_FEATURES:Mglob) || \
+      !empty(MISSING_FEATURES:Mnbcompat) || \
+      !empty(MISSING_FEATURES:Mregex) || \
+      !empty(MISSING_FEATURES:Msnprintf) || \
+      !empty(MISSING_FEATURES:Mutimes) || \
+      !empty(MISSING_FEATURES:Mvsnprintf) || \
+      !empty(MISSING_FEATURES:Mwarn)
+_FEATURE_NEED_NBCOMPAT=		yes
+.  endif
+_FEATURE_NEED_NBCOMPAT?=	no
+
+.  if ${_FEATURE_NEED_NBCOMPAT} == "yes"
+.    include "${PKGSRCDIR}/pkgtools/libnbcompat/inplace.mk"
+FEATURE_LIBS+=		${LDADD.nbcompat}
+.  endif
+
+.endif	# MISSING_FEATURES