log.mk, profile.mk: Output errors Step 3 to BUILDLOG and on screen

lib/log.mk

@@ -25,9 +25,11 @@ ifeq (2,$(DEBUG))
 SHELL += -x
 endif
 LOG = >>$(BUILDLOG) 2>&1
+LOG_STDERR = 2> >(tee -a $(BUILDLOG) >&2) 1>>$(BUILDLOG)
 else
 MAKE += -s
 LOG = 2>>$(BUILDLOG) >/dev/null
+LOG_STDERR = 2> >(tee -a $(BUILDLOG) >&2) 1>/dev/null
 endif
 
 ifeq (,$(filter-out $(DIRECT_TARGETS),$(MAKECMDGOALS)))

lib/profile.mk

@@ -132,7 +132,8 @@ profile/dump-vars:
 	fi $(LOG)
 
 # step 3 entry point: copy the needed parts into BUILDDIR
+profile/populate: SHELL=/bin/bash
 profile/populate: profile/finalize profile/dump-vars make-aptbox
 	@for dir in sub.in features.in pkg.in; do \
-		$(MAKE) -C $$dir $(LOG); \
+		$(MAKE) -C $$dir $(LOG_STDERR); \
 	done