[PATCH] Fixing volume_id Makefile for parallel make

[Matthias Schwarzott <zzam@gentoo.org>]

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Hi!

Calling parallel make with ugly options to allow forking real huge number of 
processes seems to break on machines with more cpus.

  CC       .shlib/squashfs.o
  CC       .shlib/vxfs.o
Assembler messages:
FATAL: can't create .shlib/util.o: No such file or directory
  CC       .shlib/ocfs.o
  CC       .shlib/luks.o
  CC       .shlib/gfs.o
Assembler messages:
FATAL: can't create .shlib/netware.o: No such file or directory
make[2]: *** [.shlib/util.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[2]: *** [.shlib/netware.o] Error 1


As compiling .shlib/*.o needs the directory .shlib, but it does not state that 
in makefile:

Only this command list .shlib as dependency:
$(SHLIB): $(HEADERS) .shlib $(addprefix .shlib/,$(OBJS))

But make knows that .shlib/*.o does not depend on .shlib explicitly
.shlib/%.o: %.c

changing that to 
.shlib/%.o: %.c .shlib
makes it no longer fail on missing directory.

http://bugs.gentoo.org/show_bug.cgi?id=176918

Matthias
-- 
Matthias Schwarzott (zzam)

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diff --git a/extras/volume_id/lib/Makefile b/extras/volume_id/lib/Makefile
index fafcc52..5618b96 100644
--- a/extras/volume_id/lib/Makefile
+++ b/extras/volume_id/lib/Makefile
@@ -69,7 +69,7 @@ all: libvolume_id.a $(SHLIB) libvolume_id.pc
 .shlib:
 	$(Q) mkdir .shlib
 
-.shlib/%.o: %.c
+.shlib/%.o: %.c .shlib
 	$(E) "  CC      " $@
 	$(Q) $(CC) -c $(CFLAGS) -fPIC $< -o $@
 

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