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-rw-r--r--apps/bitmaps/bitmaps.make2
-rw-r--r--tools/functions.make15
-rw-r--r--tools/root.make2
3 files changed, 17 insertions, 2 deletions
diff --git a/apps/bitmaps/bitmaps.make b/apps/bitmaps/bitmaps.make
index 159c31b64f..a8165b9409 100644
--- a/apps/bitmaps/bitmaps.make
+++ b/apps/bitmaps/bitmaps.make
@@ -25,7 +25,7 @@ ifneq ($(strip $(BMP2RB_REMOTENATIVE)),)
BMP += $(call preprocess, $(BITMAPDIR)/remote_native/SOURCES)
endif
-BMPOBJ = $(BMP:$(ROOTDIR)/%.bmp=$(BUILDDIR)/%.o)
+BMPOBJ = $(call full_path_subst,$(ROOTDIR)/%.bmp,$(BUILDDIR)/%.o,$(BMP))
BMPHFILES = $(BMPINCDIR)/usblogo.h $(BMPINCDIR)/remote_usblogo.h \
$(BMPINCDIR)/default_icons.h $(BMPINCDIR)/remote_default_icons.h \
diff --git a/tools/functions.make b/tools/functions.make
index 2a26e48bf2..806e1a2f3e 100644
--- a/tools/functions.make
+++ b/tools/functions.make
@@ -73,3 +73,18 @@ ifeq ($(call info),old)
export info=echo "$$(1)";
endif
+# path substituion can be surprisingly tricky, indeed the following almost
+# always work but not quite:
+# BMPOBJ = $(BMP:$(ROOTDIR)/%.bmp=$(BUILDDIR)/%.o)
+# indeed if
+# ROOTDIR=/rockbox
+# BUILDDIR=/rockbox/build-bla
+# then:
+# /rockbox/apps/bitmaps/rockboxlogo-bla.bmp -> /rockbox/apps/bitmaps/rockbox/build-blalogo.o
+# this function ensure that this type of problems does not occur
+#
+# usage: $(call full_path_subst,patterm,replacement,text)
+#
+# example: $(call full_path_subst,$(ROOTDIR)/%.bmp,$(BUILDDIR)/%.o,$(BMP))
+NO_MATCH=this_string_will_never_match_anything
+full_path_subst=$(patsubst $(NO_MATCH)/%,%, $(patsubst $(NO_MATCH)/$(1), $(2), $(addprefix $(NO_MATCH)/, $(3))))
diff --git a/tools/root.make b/tools/root.make
index 2deae8cc82..c9f4a2eb65 100644
--- a/tools/root.make
+++ b/tools/root.make
@@ -157,7 +157,7 @@ endif # CORE_GCSECTIONS
OBJ := $(SRC:.c=.o)
OBJ := $(OBJ:.S=.o)
OBJ += $(BMP:.bmp=.o)
-OBJ := $(subst $(ROOTDIR),$(BUILDDIR),$(OBJ))
+OBJ := $(call full_path_subst,$(ROOTDIR)/%,$(BUILDDIR)/%,$(OBJ))
build: $(TOOLS) $(BUILDDIR)/$(BINARY) $(CODECS) $(ROCKS) $(ARCHOSROM) $(RBINFO)