gcc: warnings being treated as errors

在Ubuntu 9.04，編譯linux kernel for mips時出現了這個問題

gcc: warnings being treated as errors
scripts/kconfig/conf.c:104: error: ignoring return value of 'fgets', declared with attribute warn_unused_result
...

原來是在./src/Makefile的HOSTCFLAGS variables加了-Werror...
把它去掉之後，就能編過了...