build: tell users to do non-paralle builds on errors

[openwrt.git] / include / toplevel.mk

diff --git a/include/toplevel.mk b/include/toplevel.mk
index 33baa86..d8651d9 100644 (file)
--- a/include/toplevel.mk
+++ b/include/toplevel.mk
@@ -166,6 +166,8 @@ clean dirclean: .config
 prereq:: prepare-tmpinfo .config
        @+$(NO_TRACE_MAKE) -r -s $@
 
+WARN_PARALLEL_ERROR = $(if $(BUILD_LOG),,$(and $(filter -j,$(MAKEFLAGS)),$(findstring s,$(OPENWRT_VERBOSE))))
+
 ifeq ($(SDK),1)
 
 %::
@@ -184,7 +186,10 @@ else
                        printf "$(_R)WARNING: your configuration is out of sync. Please run make menuconfig, oldconfig or defconfig!$(_N)\n" >&2; \
                fi \
        )
-       @+$(ULIMIT_FIX) $(SUBMAKE) -r $@
+       @+$(ULIMIT_FIX) $(SUBMAKE) -r $@ $(if $(WARN_PARALLEL_ERROR), || { \
+               printf "$(_R)Build failed - please re-run with -j1 to see the real error message$(_N)\n" >&2; \
+               false; \
+       } )
 
 endif