Introduce find-headers.mk, ablility to find builtin header files.

Inspired by find-libs.mk and find-files.mk.

2 files changed, 106 insertions, 1 deletions

diff --git a/mk/buildlink3/bsd.builtin.mk b/mk/buildlink3/bsd.builtin.mk
index e9d16bcdf98..8651d90038c 100644
--- a/mk/buildlink3/bsd.builtin.mk
+++ b/mk/buildlink3/bsd.builtin.mk
@@ -1,4 +1,4 @@
-# $NetBSD: bsd.builtin.mk,v 1.12 2013/09/04 15:14:45 jperkin Exp $
+# $NetBSD: bsd.builtin.mk,v 1.13 2013/11/23 09:06:09 obache Exp $
 #
 # Copyright (c) 2004-2005 The NetBSD Foundation, Inc.
 # All rights reserved.
@@ -171,4 +171,5 @@ _BUILTIN_PKGS+=	${_pkg_}
 .endfor
 
 .include "../../mk/buildlink3/find-libs.mk"
+.include "../../mk/buildlink3/find-headers.mk"
 .include "../../mk/buildlink3/find-files.mk"
diff --git a/mk/buildlink3/find-headers.mk b/mk/buildlink3/find-headers.mk
new file mode 100644
index 00000000000..bf3342500ac
--- /dev/null
+++ b/mk/buildlink3/find-headers.mk
@@ -0,0 +1,104 @@
+# $NetBSD: find-headers.mk,v 1.1 2013/11/23 09:06:09 obache Exp $
+#
+# Copyright (c) 2005 The NetBSD Foundation, Inc.
+# All rights reserved.
+#
+# This code is derived from software contributed to The NetBSD Foundation
+# by Johnny C. Lam.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+# 3. All advertising materials mentioning features or use of this software
+#    must display the following acknowledgement:
+#        This product includes software developed by the NetBSD
+#        Foundation, Inc. and its contributors.
+# 4. Neither the name of The NetBSD Foundation nor the names of its
+#    contributors may be used to endorse or promote products derived
+#    from this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+
+#
+# This is a "subroutine" that can be included to detect the presence of
+# header files in the base system.
+#
+# The following variables must be defined before including this file:
+#
+#    BUILTIN_FIND_HEADERS_VAR is a list of variables to define.  These
+#	variables take the value of the path to the file that is
+#	"found".
+#
+#    BUILTIN_FIND_HEADERS.<var> is the list of header files to find, in
+#	order, on the ${COMPILER_INCLUDE_DIRS}.  The variable <var> is set
+#	to the first path "found" on the filesystem.
+#
+# Optionally, the following variables may also be defined:
+#
+#    BUILTIN_FIND_GREP.<var> is a regular expression that must be
+#	matched within a file in order for the file to be considered
+#	"found".  If it isn't defined, then we simply check for the
+#	existence of the file.
+#
+# After including this file, the following variables are defined:
+#
+#    <var> is the first of the header file listed in
+#	${BUILTIN_FIND_HEADERS.<var>} that is "found" in
+#	${COMPILER_INCLUDE_DIRS}, or else it is "__nonexistent__".
+#
+# An example use is:
+#
+# BUILTIN_FIND_HEADERS_VAR:=	FOO BAR
+#
+# BUILTIN_FIND_HEADERS.FOO=	header1.h header2.h
+# BUILTIN_FIND_GREP.FOO=	\#define.*FOO
+#
+# BUILTIN_FIND_HEADERS.BAR=	header3.h heaer/4.h
+# .include "../../mk/buildlink3/builtin-files.mk"
+#
+
+.if empty(USE_TOOLS:Mecho)
+USE_TOOLS+=	echo
+.endif
+.if empty(USE_TOOLS:Mgrep)
+USE_TOOLS+=	grep
+.endif
+
+.for _var_ in ${BUILTIN_FIND_HEADERS_VAR}
+.  if !defined(${_var_})
+${_var_}=	__nonexistent__
+.    for _file_ in ${BUILTIN_FIND_HEADERS.${_var_}}
+.      for _dir_ in ${COMPILER_INCLUDE_DIRS}
+.        if !empty(${_var_}:M__nonexistent__) && exists(${_dir_}/${_file_})
+.          if !defined(BUILTIN_FIND_GREP.${_var_})
+${_var_}=	${_dir_}/${_file_}
+.          else
+${_var_}!=								\
+  	if ${GREP} -q ${BUILTIN_FIND_GREP.${_var_}:Q} ${_dir_:Q}/${_file_:Q}; then	\
+		${ECHO} ${_dir_:Q}/${_file_:Q};				\
+	else								\
+		${ECHO} __nonexistent__;				\
+	fi
+.          endif
+.        endif
+.      endfor
+.    endfor
+.  endif
+MAKEVARS+=	${_var_}
+.endfor