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在链接libmysqlclient的时候，发现出现如下错误： /usr/lib64/mysql/libz.a(adler32.o)(.text+0x0): In function `adler32': /usr/lib64/mysql/libz.a(inftrees.o)(.text+0x0): In function `inflate_table': /export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/inftrees.c:39: multiple definition of `inflate_table' /usr/lib64/mysql/libmysqlclient_r.a(inftrees.o)(.text+0x0):/export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/inftrees.c:39:
first defined here /usr/lib64/mysql/libz.a(trees.o)(.rodata+0x0): In function `init_block': /export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:417: multiple definition of `_length_code' /usr/lib64/mysql/libmysqlclient_r.a(trees.o)(.rodata+0x0):/export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:417:
first defined here /usr/lib64/mysql/libz.a(trees.o)(.rodata+0x100): In function `pqdownheap': /export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:459: multiple definition of `_dist_code' /usr/lib64/mysql/libmysqlclient_r.a(trees.o)(.rodata+0x100):/export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:459:
first defined here /usr/lib64/mysql/libz.a(trees.o)(.text+0x80): In function `_tr_init': /export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:387: multiple definition of `_tr_init' /usr/lib64/mysql/libmysqlclient_r.a(trees.o)(.text+0x80):/export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:387:
first defined here /usr/lib64/mysql/libz.a(trees.o)(.text+0xd20): In function `_tr_align': /export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:894: multiple definition of `_tr_align' /usr/lib64/mysql/libmysqlclient_r.a(trees.o)(.text+0xd20):/export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:894:
first defined here /usr/lib64/mysql/libz.a(trees.o)(.text+0x14b0): In function `_tr_stored_block': /export/home/my/tmp-200903301116-5.1.34-19266/rpm/BUILD/mysql-5.1.34/zlib/trees.c:872: multiple definition of `_tr_stored_block'
从这些信息上看 libmysqlclient_r.a中的一些.o已经在libz.a中定义过了，所以出现了重定义。那么我们只要把其中一个.a文件中重定义过的.o剔除掉就可以了，方法就是： cp -p /usr/lib64/mysql/libmysqlclient_r.a /usr/lib64/mysql/libmysqlclient_r.a.orig ar d /usr/lib64/mysql/libmysqlclient_r.a adler32.o compress.o crc32.o deflate.o gzio.o infback.o inffast.o inflate.o inftrees.o trees.o uncompr.o zutil.o
这代表了一类问题，就是当出现 multiple definition of XXX 的时候都可以采用类似的方法来解决。
另外这里有两个特别要注意的地方： 1，lib64，如果安装的是32位版本，静态库可能就会是在/usr/lib64/mysql中。 2，_r，这个是线程安全版本的库的命名方式， 比如目录/usr/lib64/mysql中就有两个libmysqlclient，一个是libmysqlclient.a，还有一个是libmysqlclient_r.a。这个要特别注意，到底是用哪个静态库 |
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