[coreboot] #199: missing main prototype while compiling with clang

[coreboot]

#199: missing main prototype while compiling with clang
--------------------------+----------------------------------
    Reporter:  tfarina@…  |         Owner:  stepan@…
        Type:  defect     |        Status:  new
    Priority:  minor      |     Milestone:
   Component:  coreboot   |      Keywords:
Dependencies:             |  Patch Status:  there is no patch
--------------------------+----------------------------------
 $ make
     HOSTCC     nvramtool/cli/nvramtool.o
     HOSTCC     nvramtool/cli/opts.o
     HOSTCC     nvramtool/cmos_lowlevel.o
     HOSTCC     nvramtool/cmos_ops.o
     HOSTCC     nvramtool/common.o
     HOSTCC     nvramtool/compute_ip_checksum.o
     HOSTCC     nvramtool/hexdump.o
     HOSTCC     nvramtool/input_file.o
     HOSTCC     nvramtool/layout.o
     HOSTCC     nvramtool/accessors/layout-common.o
     HOSTCC     nvramtool/accessors/layout-text.o
     HOSTCC     nvramtool/accessors/layout-bin.o
     HOSTCC     nvramtool/lbtable.o
     HOSTCC     nvramtool/reg_expr.o
     HOSTCC     nvramtool/cbfs.o
     HOSTCC     nvramtool/accessors/cmos-mem.o
     HOSTCC     nvramtool/nvramtool (link)
     OPTION     option_table.h
     GEN        build.h
     CC         romstage.inc
 src/mainboard/intel/cougar_canyon2/romstage.c:173:6: error: no previous
       prototype for function 'main' [-Werror,-Wmissing-prototypes]
 void main(FSP_INFO_HEADER *fsp_info_header)
      ^
 1 error generated.
 make: *** [build/mainboard/intel/cougar_canyon2/romstage.pre.inc] Error 1

$ clang --version
 clang version 3.4 (trunk 193323)
 Target: x86_64-unknown-linux-gnu
 Thread model: posix

$ uname -a
 Linux i3 3.2.0-57-generic #87-Ubuntu SMP Tue Nov 12 21:35:10 UTC 2013
 x86_64 x86_64 x86_64 GNU/Linux