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The output file in.o is empty

From: wangwzc <wangwzc at sina dot com>
To: gcc-help at gcc dot gnu dot org
Date: Tue, 27 Jan 2015 19:28:31 -0700 (MST)
Subject: The output file in.o is empty
Authentication-results: sourceware.org; auth=none

    I use the following command to compile the in.c, there are no error was
printed, but the output file in.o is empty. why was that, how to debug it.

cc -g -Wstrict-prototypes  -DCPPUTEST_COMPILATION -Wall -Wextra -Werror
-Wshadow -Wswitch-default -Wswitch-enum -Wconversion -pedantic-errors
-include ./cpputest/include/CppUTest/MemoryLeakDetectorMallocMacros.h  -I. 
-Itst  -Iinclude  -I./cpputest/include  -Isrc/sys/poxlib/opt  -Isrc/include 
-Isrc/sys/sys  -Isrc/sys -Isrc/sys/contrib/altq   -DUNIT_TEST -D_far_=
-D_XOPEN_SOURCE=500 -D_KERNEL -DMAXCPU=1 -w -Dnear= -Dfar=  -DDMX -M
-std=c99   -c -MMD -MP  -o objs/src/sys/netinet/in.o src/sys/netinet/in.c



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