CheckIncludeFileCxx找不到标头

Question

我正在尝试使用CheckIncludeFileCXX模块来验证系统中存在<gsl/gsl>。GSL存在于/usr/local/include/gsl/gsl，但生成失败在"GSL not found"

project(cpp-binaries)
cmake_minimum_required(VERSION 3.2)
include(CheckIncludeFileCXX)
CHECK_INCLUDE_FILE_CXX("gsl/gsl" GSL_LIBRARY)
if(NOT GSL_LIBRARY)
    message(FATAL_ERROR "GSL not found")
endif(NOT GSL_LIBRARY)
add_executable(
    cpp-binaries
    "main.cpp"
)

Answer 1

好吧，我更多地研究了CheckIncludeFileCXX，您基本上必须用CMAKE_REQUIRED_INCLUDES指定一些内容，否则它不知道在哪里搜索。为了给它一些东西，它会悄悄地搜索包含find_path的包含，但如果什么也找不到。

project(gsl_t)
cmake_minimum_required(VERSION 3.2)
find_path(
    gsl_location
    gsl
    HINTS ENV GSLDIR
)
if(gsl_location)
    get_filename_component(gsl_include_dir ${gsl_location} DIRECTORY)
    list(APPEND CMAKE_INCLUDE_PATH ${gsl_include_dir})
endif(gsl_location)
include(CheckIncludeFileCXX)
set(CMAKE_REQUIRED_INCLUDES ${CMAKE_INCLUDE_PATH})
CHECK_INCLUDE_FILE_CXX("gsl/gsl" gsl_found)
if(NOT gsl_found)
    message(FATAL_ERROR "GSL not found. 
                        Try setting the GSLDIR environment variable")
endif(NOT gsl_found)
add_executable(
    gsl_t
    "main.cpp"
)