尽管存在符号，但CMake中的符号查找失败 [英] Symbol lookup in CMake fails although symbol is present

问题描述

我正在尝试使用CMake检查符号getaddrinfo_a是否存在:

I am trying to check whether symbol getaddrinfo_a exists using CMake:

list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
check_symbol_exists(getaddrinfo_a netdb.h HAVE_GETADDRINFO_A)
list(REMOVE_ITEM CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)

虽然在netdb.h中定义了getaddrinfo_a(假设已定义_GNU_SOURCE)，但CMake找不到它:

While getaddrinfo_a is defined in netdb.h (given that _GNU_SOURCE is defined), CMake fails to find it:

-- Looking for getaddrinfo_a
-- Looking for getaddrinfo_a - not found.

知道我在做什么错吗?

推荐答案

根据

According to the getaddrinfo_a man page, the function requires libanl at link time. Try setting CMAKE_REQUIRED_LIBRARIES before invoking check_symbol_exists:

list(APPEND CMAKE_REQUIRED_DEFINITIONS -D_GNU_SOURCE)
list(APPEND CMAKE_REQUIRED_LIBRARIES anl)
check_symbol_exists(getaddrinfo netdb.h HAVE_GETADDRINFO_A)

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