From 22e4060d4aec95ee386fdb2c6932cffa0c5e62be Mon Sep 17 00:00:00 2001
From: midipix <writeonce@midipix.org>
Date: Thu, 23 Nov 2017 03:38:48 -0500
Subject: build system: added --cchost support.

---
 Makefile.in          |  9 +++++++--
 config.project       |  1 +
 config.usage         |  2 ++
 configure            | 21 ++++++++++++++++++++-
 sysinfo/host/host.sh |  2 +-
 5 files changed, 31 insertions(+), 4 deletions(-)

diff --git a/Makefile.in b/Makefile.in
index bae3699..b825744 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -8,6 +8,7 @@ AVOID_VERSION		= @avoid_version@
 
 BUILD 			= @build@
 HOST 			= @host@
+CCHOST 			= @cchost@
 TARGET 			= @target@
 ARCH 			= @arch@
 COMPILER 		= @compiler@
@@ -231,6 +232,9 @@ dirs.tag:
 		mkdir -p lib
 		touch dirs.tag
 
+cchost:
+		$(PROJECT_DIR)/sysinfo/host/host.sh --compiler="$(CC)" --cflags="$(CFLAGS)"
+
 host.tag:	Makefile
 		$(PROJECT_DIR)/sysinfo/host/host.sh --compiler="$(CC)" --cflags="$(CFLAGS)"
 		touch host.tag
@@ -283,6 +287,7 @@ clean:		clean-implib
 .display-env:
 		@echo BUILD:'                  '$(BUILD)
 		@echo HOST:'                   '$(HOST)
+		@echo CCHOST:'                 '$(CCHOST)
 		@echo TARGET:'                 '$(TARGET)
 		@echo ARCH:'                   '$(ARCH)
 		@echo COMPILER:'               '$(COMPILER)
@@ -409,8 +414,8 @@ clean:		clean-implib
 		@echo $(CFLAGS)
 
 
-.PHONY:		all install shared static app \
-		package-app \
+.PHONY:		cchost package-app \
+		all install shared static app \
 		shared-objs shared-lib \
 		shared-soname shared-solink \
 		package-shared-soname package-shared-solink \
diff --git a/config.project b/config.project
index 15c4487..c11e000 100644
--- a/config.project
+++ b/config.project
@@ -8,6 +8,7 @@ mb_avoid_version=no
 # build
 mb_default_build=
 mb_default_host=
+mb_default_cchost=
 mb_default_target=
 mb_default_arch=
 mb_default_compiler=
diff --git a/config.usage b/config.usage
index ffc327c..d93852d 100644
--- a/config.usage
+++ b/config.usage
@@ -34,6 +34,7 @@ supported switches:
 
 	--build
 	--host
+	--cchost
 	--target
 	--arch
 	--compiler
@@ -94,6 +95,7 @@ supported variables:
 
 	BUILD
 	HOST
+	CCHOST
 	TARGET
 	ARCH
 	COMPILER
diff --git a/configure b/configure
index dbe5e08..c7bb6ff 100755
--- a/configure
+++ b/configure
@@ -66,6 +66,7 @@ init_vars()
 	# build
 	mb_build=$BUILD
 	mb_host=$HOST
+	mb_cchost=$CCHOST
 	mb_target=$TARGET
 	mb_arch=$ARCH
 	mb_compiler=$COMPILER
@@ -198,6 +199,7 @@ common_defaults()
 	# build
 	[ -z "$mb_build" ] 		&& mb_build=$mb_default_build
 	[ -z "$mb_host" ] 		&& mb_host=$mb_default_host
+	[ -z "$mb_cchost" ] 		&& mb_cchost=$mb_default_cchost
 	[ -z "$mb_target" ] 		&& mb_target=$mb_default_target
 	[ -z "$mb_arch" ] 		&& mb_arch=$mb_default_arch
 	[ -z "$mb_compiler" ] 		&& mb_compiler=$mb_default_compiler
@@ -514,7 +516,21 @@ config_copy()
 			-e 's^@disable_frontend@^'"$mb_disable_frontend"'^g'		\
 			-e 's^@disable_static@^'"$mb_disable_static"'^g'		\
 			-e 's^@disable_shared@^'"$mb_disable_shared"'^g'		\
-		$mb_project_dir/Makefile.in > $mb_pwd/Makefile
+		$mb_project_dir/Makefile.in > $mb_pwd/Makefile.tmp || exit 2
+
+	if [ -z "$mb_cchost" ]; then
+		if [ "$mb_host" = 'native' ]; then
+			mb_cchost=`make -s -f $mb_pwd/Makefile.tmp cchost`
+		else
+			mb_cchost=$mb_host
+		fi
+	fi
+
+	sed -e 's^@cchost@^'"$mb_cchost"'^g' $mb_pwd/Makefile.tmp \
+	  > $mb_pwd/Makefile.host                  || exit 2
+
+	rm  $mb_pwd/Makefile.tmp                   || exit 2
+	mv  $mb_pwd/Makefile.host $mb_pwd/Makefile || exit 2
 }
 
 
@@ -645,6 +661,9 @@ for arg ; do
 		--host=*)
 			mb_host=${arg#*=}
 			;;
+		--cchost=*)
+			mb_cchost=${arg#*=}
+			;;
 		--target=*)
 			mb_target=${arg#*=}
 			;;
diff --git a/sysinfo/host/host.sh b/sysinfo/host/host.sh
index b3975ae..686edca 100755
--- a/sysinfo/host/host.sh
+++ b/sysinfo/host/host.sh
@@ -15,7 +15,7 @@ host_test()
 		exit 2
 	fi
 
-	$mb_compiler -dM -E - < /dev/null > /dev/null && return 0
+	$mb_compiler $mb_cflags -dumpmachine && return 0
 
 	error_msg "config error: invalid compiler."
 	exit 2
-- 
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