mipsel-linux-uclibc交叉编译 libbzip2

作者提供了一个编译so的脚本：

看起来只用CC，很简单的。

不过作者提供的Makefile很复杂，不懂这俩有啥区别。

# This Makefile builds a shared version of the library, 
# libbz2.so.1.0.6, with soname libbz2.so.1.0,
# at least on x86-Linux (RedHat 7.2), 
# with gcc-2.96 20000731 (Red Hat Linux 7.1 2.96-98).  
# Please see the README file for some important info 
# about building the library like this.

# ------------------------------------------------------------------
# This file is part of bzip2/libbzip2, a program and library for
# lossless, block-sorting data compression.
#
# bzip2/libbzip2 version 1.0.6 of 6 September 2010
# Copyright (C) 1996-2010 Julian Seward <[e-mail]>
#
# Please read the WARNING, DISCLAIMER and PATENTS sections in the 
# README file.
#
# This program is released under the terms of the license contained
# in the file LICENSE.
# ------------------------------------------------------------------


SHELL=/bin/sh
CC=gcc
BIGFILES=-D_FILE_OFFSET_BITS=64
CFLAGS=-fpic -fPIC -Wall -Winline -O2 -g $(BIGFILES)

OBJS= blocksort.o  \
      huffman.o    \
      crctable.o   \
      randtable.o  \
      compress.o   \
      decompress.o \
      bzlib.o

all: $(OBJS)
	$(CC) -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.6 $(OBJS)
	$(CC) $(CFLAGS) -o bzip2-shared bzip2.c libbz2.so.1.0.6
	rm -f libbz2.so.1.0
	ln -s libbz2.so.1.0.6 libbz2.so.1.0

clean: 
	rm -f $(OBJS) bzip2.o libbz2.so.1.0.6 libbz2.so.1.0 bzip2-shared

blocksort.o: blocksort.c
	$(CC) $(CFLAGS) -c blocksort.c
huffman.o: huffman.c
	$(CC) $(CFLAGS) -c huffman.c
crctable.o: crctable.c
	$(CC) $(CFLAGS) -c crctable.c
randtable.o: randtable.c
	$(CC) $(CFLAGS) -c randtable.c
compress.o: compress.c
	$(CC) $(CFLAGS) -c compress.c
decompress.o: decompress.c
	$(CC) $(CFLAGS) -c decompress.c
bzlib.o: bzlib.c
	$(CC) $(CFLAGS) -c bzlib.c

zhangbin@bogon:~/bcm/unimedia/depvlc/libbzip2/code_bzip2-1.0.6$ 

zhangbin@bogon:~/bcm/unimedia/depvlc/libbzip2/code_bzip2-1.0.6$ 
zhangbin@bogon:~/bcm/unimedia/depvlc/libbzip2/code_bzip2-1.0.6$ 
zhangbin@bogon:~/bcm/unimedia/depvlc/libbzip2/code_bzip2-1.0.6$ source   bzip2_build.sh 
mipsel-linux-uclibc-gcc -fpic -fPIC -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64 -c blocksort.c
mipsel-linux-uclibc-gcc -fpic -fPIC -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64 -c huffman.c
mipsel-linux-uclibc-gcc -fpic -fPIC -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64 -c crctable.c
mipsel-linux-uclibc-gcc -fpic -fPIC -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64 -c randtable.c
mipsel-linux-uclibc-gcc -fpic -fPIC -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64 -c compress.c
mipsel-linux-uclibc-gcc -fpic -fPIC -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64 -c decompress.c
mipsel-linux-uclibc-gcc -fpic -fPIC -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64 -c bzlib.c
mipsel-linux-uclibc-gcc -shared -Wl,-soname -Wl,libbz2.so.1.0 -o libbz2.so.1.0.6 blocksort.o huffman.o crctable.o randtable.o compress.o decompress.o bzlib.o
mipsel-linux-uclibc-gcc -fpic -fPIC -Wall -Winline -O2 -g -D_FILE_OFFSET_BITS=64 -o bzip2-shared bzip2.c libbz2.so.1.0.6
/tmp/ccf3RPEE.o: In function `applySavedTimeInfoToOutputFile':
/home/lbteam/zhangbin/bcm/unimedia/depvlc/libbzip2/code_bzip2-1.0.6/bzip2.c:1059: warning: the use of OBSOLESCENT `utime' is discouraged, use `utimes'
rm -f libbz2.so.1.0
ln -s libbz2.so.1.0.6 libbz2.so.1.0

zhangbin@bogon:~/bcm/unimedia/depvlc/libbzip2/code_bzip2-1.0.6$ 

只需要so文件就好了吧。