如何使用 PostgreSQL 构建 SOCI？

Question

我正在尝试构建 SOCI 库以与 PostgreSQL 一起运行。我按照以下步骤操作：

• 在 Ubutu 15.10 中安装 PostgreSQL
• 下载 SOCI 源代码
• 提取 SOCI 代码

然后我运行以下命令：

mkdir build
cd build
cmake -G "Unix Makefiles" -DWITH_BOOST=OFF -DWITH_POSTGRESQL=ON -DPOSTGRESQL_INCLUDE_DIR=/usr/local/pgsql/include -DPOSTGRESQL_LIBRARIES=/usr/local/pgsql/lib ../soci

此时，CMake 给出了以下警告：

WARNING: Target "soci_postgresql" requests linking to directory "/usr/local/pgsql/lib".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "soci_postgresql_static" requests linking to directory "/usr/local/pgsql/lib".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "soci_postgresql_test" requests linking to directory "/usr/local/pgsql/lib".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "soci_postgresql_test" requests linking to directory "/usr/local/pgsql/lib".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "soci_postgresql_test_static" requests linking to directory "/usr/local/pgsql/lib".  Targets may link only to libraries.  CMake is dropping the item.
WARNING: Target "soci_postgresql_test_static" requests linking to directory "/usr/local/pgsql/lib".  Targets may link only to libraries.  CMake is dropping the item.

坚持构建，然后我运行make，但失败并出现以下错误：

[ 98%] Building CXX object tests/postgresql/CMakeFiles/soci_postgresql_test.dir/test-postgresql.cpp.o
Linking CXX executable ../../bin/soci_postgresql_test
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQresultStatus'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQgetvalue'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQclear'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQserverVersion'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQresultErrorMessage'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQexec'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `lo_lseek'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQfsize'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQgetisnull'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQerrorMessage'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `lo_open'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQexecPrepared'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQftype'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `lo_close'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQexecParams'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQfname'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQconnectdb'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQstatus'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQntuples'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQresultErrorField'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQfformat'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `lo_read'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQfinish'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQprepare'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `lo_write'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQcmdTuples'
../../lib/libsoci_postgresql.so.4.0.0: undefined reference to `PQnfields'
collect2: error: ld returned 1 exit status
tests/postgresql/CMakeFiles/soci_postgresql_test.dir/build.make:89: recipe for target 'bin/soci_postgresql_test' failed
make[2]: *** [bin/soci_postgresql_test] Error 1
CMakeFiles/Makefile2:609: recipe for target 'tests/postgresql/CMakeFiles/soci_postgresql_test.dir/all' failed
make[1]: *** [tests/postgresql/CMakeFiles/soci_postgresql_test.dir/all] Error 2
Makefile:126: recipe for target 'all' failed
make: *** [all] Error 2

知道 CMake 警告和构建错误的原因可能是什么吗？

Answer 1

尝试使用稍微不同的选项调用 cmake

cmake -G "Unix Makefiles" -DWITH_BOOST=OFF -DWITH_POSTGRESQL=ON \
  -DPOSTGRESQL_INCLUDE_DIR:STRING="/usr/local/pgsql/include" \
  -DPOSTGRESQL_LIBRARIES:STRING="/usr/local/pgsql/lib" ../soci

Answer 2

我从 github 上得到了正确答案，here is link。 以下回复主要取自那里，但为方便起见在此重复（带有清理和澄清）：

-DPOSTGRESQL_LIBRARIES=/usr/local/psql/lib 应该指向库，而不是目录。

以下警告已经强调了这一点：

警告：目标“soci_postgresql”请求链接到目录 "/usr/local/postgresql/lib"

请尝试以下命令（您可能还需要先从构建目录中删除您的CMakeCache.txt）：

cmake -G "Unix Makefiles" -DWITH_BOOST=OFF -DWITH_POSTGRESQL=ON ../soci

在安装了"postgresql-devel.x86_64 : PostgreSQL development header files and libraries"的Linux系统上，这个命令应该够用了。