编译 BerkeleyDB 示例。

Question

我正在尝试执行 berkeleyDB 示例。我用 make 和 make install 安装了 BDB。在examples/c 目录中，我做了一个gcc ex_*.c，对于任何例子，以下是我得到的。我这样做是否正确？

ex_access.c: In function ‘main’:
ex_access.c:34: error: ‘DBC’ undeclared (first use in this function)
ex_access.c:34: error: (Each undeclared identifier is reported only once
ex_access.c:34: error: for each function it appears in.)
ex_access.c:34: error: ‘dbcp’ undeclared (first use in this function)
ex_access.c:64: warning: format ‘%s’ expects type ‘char *’, but argument 4 has type ‘int’
ex_access.c:67: error: ‘DB’ has no member named ‘set_errfile’
ex_access.c:68: error: ‘DB’ has no member named ‘set_errpfx’
ex_access.c:69: error: ‘DB’ has no member named ‘set_pagesize’
ex_access.c:70: error: ‘DB’ has no member named ‘err’
ex_access.c:73: error: ‘DB’ has no member named ‘set_cachesize’
ex_access.c:74: error: ‘DB’ has no member named ‘err’
ex_access.c:77: error: ‘DB’ has no member named ‘open’
ex_access.c:78: error: ‘DB_CREATE’ undeclared (first use in this function)
ex_access.c:79: error: ‘DB’ has no member named ‘err’
ex_access.c:107: error: ‘DB_NOOVERWRITE’ undeclared (first use in this function)
ex_access.c:107: warning: passing argument 4 of ‘dbp->put’ makes integer from pointer without a cast
ex_access.c:107: error: too many arguments to function ‘dbp->put’
ex_access.c:111: error: ‘DB’ has no member named ‘err’
ex_access.c:112: error: ‘DB_KEYEXIST’ undeclared (first use in this function)
ex_access.c:120: error: ‘DB’ has no member named ‘cursor’
ex_access.c:121: error: ‘DB’ has no member named ‘err’
ex_access.c:130: error: ‘DB_NEXT’ undeclared (first use in this function)
ex_access.c:134: error: ‘DB_NOTFOUND’ undeclared (first use in this function)
ex_access.c:135: error: ‘DB’ has no member named ‘err’
ex_access.c:141: error: ‘DB’ has no member named ‘err’
ex_access.c:144: error: too many arguments to function ‘dbp->close’
ex_access.c:146: warning: format ‘%s’ expects type ‘char *’, but argument 4 has type ‘int’
ex_access.c:152: error: too many arguments to function ‘dbp->close’

Answer 1

这可能是链接错误。您需要指定 libdb 共享库，例如“-ldb”。如果 Berkeley DB 库安装在系统范围内，那么您可以假设共享库和头文件安装在默认路径（/usr/lib、/usr/lib64、/usr/include）中。如果没有，那么您需要明确包含正确的路径。假设默认安装 Berkeley DB，您可以尝试类似

gcc -ldb your_sample.c -o your_sample

另外，您的问题与这篇文章有关：berkeley DB: can't compile c++ codes

或者，进入构建文件夹（例如，“build_unix”）并运行“make examples”来构建示例。