nodejs: force python interpreter

nodejs build system is based on python, and it does not support python3.

This patch makes sure python2 is used for the build.

Note that, setting PYTHON=... at configure time or in the make
environment is not enough to override all the hard-coded python call, so
we have to sed some python scripts to avoid being screwed.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/nodejs/nodejs.mk

@@ -17,6 +17,10 @@ ifeq ($(BR2_PACKAGE_OPENSSL),y)
 	NODEJS_DEPENDENCIES += openssl
 endif
 
+# nodejs build system is based on python, but only support python-2.6 or
+# python-2.7. So, we have to enforce PYTHON interpreter to be python2.
+# However, few build scripts hard-code 'python' as the interpreter to be
+# invoked; so we have to manually fix them.
 define HOST_NODEJS_CONFIGURE_CMDS
 	# Build with the static, built-in OpenSSL which is supplied as part of
 	# the nodejs source distribution.  This is needed on the host because
@@ -24,20 +28,23 @@ define HOST_NODEJS_CONFIGURE_CMDS
 	# buildroot.
 	(cd $(@D); \
 		$(HOST_CONFIGURE_OPTS) \
-		./configure \
+		PYTHON=$(HOST_DIR)/usr/bin/python2 \
+		$(HOST_DIR)/usr/bin/python2 ./configure \
 		--prefix=$(HOST_DIR)/usr \
 		--without-snapshot \
 		--without-dtrace \
 		--without-etw \
 	)
+	$(SED) "s@'python',@'$(HOST_DIR)/usr/bin/python2',@" \
+		$(@D)/deps/v8/tools/gyp/v8.gyp
 endef
 
 define HOST_NODEJS_BUILD_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D)
+	$(HOST_MAKE_ENV) PYTHON=$(HOST_DIR)/usr/bin/python2 $(MAKE) -C $(@D)
 endef
 
 define HOST_NODEJS_INSTALL_CMDS
-	$(HOST_MAKE_ENV) $(MAKE) -C $(@D) install
+	$(HOST_MAKE_ENV) PYTHON=$(HOST_DIR)/usr/bin/python2 $(MAKE) -C $(@D) install
 endef
 
 ifeq ($(BR2_i386),y)
@@ -62,7 +69,8 @@ define NODEJS_CONFIGURE_CMDS
 	(cd $(@D); \
 		$(TARGET_CONFIGURE_OPTS) \
 		LD="$(TARGET_CXX)" \
-		./configure \
+		PYTHON=$(HOST_DIR)/usr/bin/python2 \
+		$(HOST_DIR)/usr/bin/python2 ./configure \
 		--prefix=/usr \
 		--without-snapshot \
 		$(if $(BR2_PACKAGE_OPENSSL),--shared-openssl,--without-ssl) \
@@ -73,10 +81,13 @@ define NODEJS_CONFIGURE_CMDS
 		$(if $(NODEJS_ARM_FP),--with-arm-float-abi=$(NODEJS_ARM_FP)) \
 		--dest-os=linux \
 	)
+	$(SED) "s@'python',@'$(HOST_DIR)/usr/bin/python2',@" \
+		$(@D)/deps/v8/tools/gyp/v8.gyp
 endef
 
 define NODEJS_BUILD_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) \
+	$(TARGET_MAKE_ENV) PYTHON=$(HOST_DIR)/usr/bin/python2 \
+		$(MAKE) -C $(@D) \
 		$(TARGET_CONFIGURE_OPTS) \
 		LD="$(TARGET_CXX)"
 endef
@@ -110,7 +121,8 @@ endef
 endif
 
 define NODEJS_INSTALL_TARGET_CMDS
-	$(TARGET_MAKE_ENV) $(MAKE) -C $(@D) install \
+	$(TARGET_MAKE_ENV) PYTHON=$(HOST_DIR)/usr/bin/python2 \
+		$(MAKE) -C $(@D) install \
 		DESTDIR=$(TARGET_DIR) \
 		$(TARGET_CONFIGURE_OPTS) \
 		LD="$(TARGET_CXX)"