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In subdir 'gcc', Most C source files included config.h which was generated by a rule. But no related prerequisites was added to the C source compiling rule. There was potential building failure while makefile enabled parallel. The C source compiling rule used suffix rule '.c.o', but the suffix rule doesn't support prerequisites. https://www.gnu.org/software/make/manual/html_node/Suffix-Rules.html We used the pattern rule '%.o : %.c' to instead, and add the config.h as its prerequisite We also moved the '%.o : %.c' rule down to the 'build/%.o :' rule, which makes '%.o : %.c' rule doesn't override 'build/%.o :'. [YOCTO #6568] (From OE-Core rev: 86c2483f0fe05fb763d280ae22d70e54cb4bb0bc) Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>