build: Properly generate build dependency for autogenerated bitmap .h files

 * bmp2rb generated a .h file that rockbox .c files used.
 * .h files in .c files were used to generate dependency graphs for make
 * When Make saw the .h file for the bitmap, it didn't know how what
   to do with them
 * Only arose in parallel builds

Fixed this by adding explicit dependencies for the .h files as part of
the existing 'bmpdepfile' function.

Solves the Xduoo X3 bootloader build failure that I could trigger 100%
of the time by using 'make -j8'

Change-Id: I6b3e78dde26c820a3b6c7c286e7d6c981b8e01fc

1 files changed, 2 insertions, 0 deletions

diff --git a/tools/functions.make b/tools/functions.make
index 806e1a2f3e..a2c715e9e1 100644
--- a/tools/functions.make
+++ b/tools/functions.make
@@ -55,8 +55,10 @@ bmpdepfile = $(SILENT) \
         for each in $(2); do \
             obj=`echo $$each | sed -e 's/\.bmp/.o/' -e 's:$(ROOTDIR):$(BUILDDIR):'`; \
             src=`echo $$each | sed -e 's/\.bmp/.c/' -e 's:$(ROOTDIR):$(BUILDDIR):'`; \
+            hdr=`echo $$each | sed -e 's/.*\/\(.*\)\..*\.bmp/bitmaps\/\1\.h/'`; \
             echo $$obj: $$src; \
             echo $$src: $$each; \
+            echo $(BUILDDIR)/$$hdr: $$src; \
         done \
         >> $(1)