From d0bd34b5562259df0d02e0553be2708d918af0f3 Mon Sep 17 00:00:00 2001
From: jlam <jlam@pkgsrc.org>
Date: Mon, 24 Dec 2001 19:29:32 +0000
Subject: [PATCH] Initial implementation of pthread.buildlink.mk to
 transparently allow for using either the native pthread implementation or
 using a package pthread implementation instead, e.g. pth, ptl2, mit-pthreads,
 etc.  The only currently supported package pthread implementation is pth as
 it's the only one with a buildlink.mk file.  An example usage is:

	USE_PTHREAD=	native pth
	.include "../../mk/pthread.buildlink.mk"

or a fancier example is:

	USE_PTHREAD=	native
	.include "../../mk/bsd.prefs.mk"
	.if defined(PTHREAD_TYPE) && (${PTHREAD_TYPE} == "none")
	CONFIGURE_ARGS+= --without-pthreads
	.endif
	.include "../../mk/pthread.buildlink.mk"
---
 mk/bsd.prefs.mk         |   6 ++-
 mk/pthread.buildlink.mk | 105 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+), 1 deletion(-)
 create mode 100644 mk/pthread.buildlink.mk

diff --git a/mk/bsd.prefs.mk b/mk/bsd.prefs.mk
index f487dd150e13..23f0854769db 100644
--- a/mk/bsd.prefs.mk
+++ b/mk/bsd.prefs.mk
@@ -1,4 +1,4 @@
-# $NetBSD: bsd.prefs.mk,v 1.67 2001/12/12 16:30:06 wiz Exp $
+# $NetBSD: bsd.prefs.mk,v 1.68 2001/12/24 19:29:32 jlam Exp $
 #
 # Make file, included to get the site preferences, if any.  Should
 # only be included by package Makefiles before any .if defined()
@@ -278,4 +278,8 @@ ZOULARIS_VERSION=	20000522
 MAKEFLAGS+=		ZOULARIS_VERSION="${ZOULARIS_VERSION}"
 .endif
 
+.if defined(USE_PTHREAD)
+.include "../../mk/pthread.buildlink.mk"
+.endif
+
 .endif	# BSD_PKG_MK
diff --git a/mk/pthread.buildlink.mk b/mk/pthread.buildlink.mk
new file mode 100644
index 000000000000..3fad1d665798
--- /dev/null
+++ b/mk/pthread.buildlink.mk
@@ -0,0 +1,105 @@
+# $NetBSD: pthread.buildlink.mk,v 1.1 2001/12/24 19:29:32 jlam Exp $
+#
+# This Makefile fragment is included by packages that use pthreads.
+# This Makefile fragment is also included directly by bsd.prefs.mk.
+#
+# To use this Makefile fragment, simply:
+#
+# (1) Define USE_PTHREAD _before_ including bsd.prefs.mk in the package
+#     Makefile,
+# (2) Optionally set PTHREAD_TYPE to force the use of a specific pthread
+#     implementation,
+# (3) Include bsd.prefs.mk in the package Makefile,
+# (4) And include this Makefile fragment in the package Makefile.
+#
+# The value of ${PTHREAD_TYPE} may be used after the inclusion of
+# bsd.prefs.mk, which indirectly sets this value by including this file.
+# E.g.,
+#
+# USE_PTHREAD=	native
+# .include "../../mk/bsd.prefs.mk"
+#
+# .if defined(PTHREAD_TYPE) && ${PTHREAD_TYPE} == "none"
+# CONFIGURE_ARGS+=	--without-pthreads
+# .endif
+#
+###########################################################################
+#
+# USE_PTHREAD is a list of pthread implementations that may be used, and is
+#	set in a package Makefile.  Its values are either "native" or any
+#	of the package pthread implementations listed in ${_PKG_PTHREADS},
+#	e.g. "USE_PTHREAD = native pth".
+#
+# _PKG_PTHREADS is the list of package pthread implementations recognized by
+#	pthread.buildlink.mk
+#
+.if defined(USE_PTHREAD)
+_PKG_PTHREADS?=		pth ptl2 mit-pthreads unproven-pthreads
+
+.for __valid_pthread__ in ${USE_PTHREAD}
+.  if !empty(_PKG_PTHREADS:M${__valid_pthread__})
+_PKG_PTHREAD_TYPE?=	${__valid_pthread__}
+.  endif
+.endfor
+_PKG_PTHREAD_TYPE?=	none
+
+# We check for a native pthread implementation by checking for the presence
+# of /usr/include/pthread.h (we might want to make this check stricter).
+#
+.if !empty(USE_PTHREAD:Mnative)
+.  if exists(/usr/include/pthread.h)
+PTHREAD_TYPE?=		native
+.  else
+PTHREAD_TYPE?=		${_PKG_PTHREAD_TYPE}
+.  endif
+.endif
+.endif	# USE_PTHREAD
+#
+###########################################################################
+#
+# Only allow the following section to be seen _after_ the first time this
+# file is included.  This allows this file to be included by bsd.prefs.mk
+# and also to be included in a package Makefile as is done normally, and
+# allows us to consolidate the pthread Makefile logic in one place.  We
+# want this, as we'd like for PTHREAD_TYPE to be available to package
+# Makefiles after they pull in bsd.prefs.mk.
+#
+_PTHREAD_BUILDLINK_MK_NPASSES?=	# empty
+_PTHREAD_BUILDLINK_MK_NPASSES:=	${_PTHREAD_BUILDLINK_MK_NPASSES}.
+
+.if !empty(_PTHREAD_BUILDLINK_MK_NPASSES:M..)
+.if !defined(PTHREAD_BUILDLINK_MK)
+PTHREAD_BUILDLINK_MK=	# defined
+
+.if ${PTHREAD_TYPE} == "native"
+#
+# Link the native pthread libraries and headers into ${BUILDLINK_DIR}.
+#
+.  include "../../mk/bsd.buildlink.mk"
+BUILDLINK_PREFIX.pthread=	/usr
+BUILDLINK_FILES.pthread=	include/pthread.h
+BUILDLINK_FILES.pthread+=	lib/libpthread.*
+
+BUILDLINK_TARGETS.pthread=	pthread-buildlink
+BUILDLINK_TARGETS+=		${BUILDLINK_TARGETS.pthread}
+
+pre-configure: ${BUILDLINK_TARGETS.pthread}
+pthread-buildlink: _BUILDLINK_USE
+
+.elif ${PTHREAD_TYPE} == "pth"
+.  include "../../devel/pth/buildlink.mk"
+#
+# XXX The remaining pthread packages here need to have sensible buildlink.mk
+# XXX created that may all be used more-or-less interchangeably.  This is
+# XXX slightly challenging, so please beware in the implementation.
+#
+.elif ${PTHREAD_TYPE} == "ptl2"
+DEPENDS+=		ptl>=2.1.7:../../devel/ptl2
+.elif ${PTHREAD_TYPE} == "mit-pthreads"
+DEPENDS+=		mit-pthreads-1.60b6:../../devel/mit-pthreads
+.elif ${PTHREAD_TYPE} == "unproven-pthreads"
+DEPENDS+=		unproven-threads>=0.17:../../devel/unproven-pthreads
+.endif
+
+.endif	# PTHREAD_BUILDLINK_MK
+.endif	# _PTHREAD_BUILDLINK_MK_NPASSES