我正在尝试在基于ARM-linux的系统上编译OPENCV。为此,我创建了一个带有以下选项的工具链cmake文件

SET (CMAKE_SYSTEM_NAME Linux)
SET (CMAKE_SYSTEM_VERSION 1)
SET (CMAKE_SYSTEM_PROCESSOR arm)

SET (CMAKE_C_COMPILER "/usr/local/arm/4.3.1-eabi-armv6/usr/bin/arm-linux-gcc")
SET (CMAKE_CXX_COMPILER "/usr/local/arm/4.3.1-eabi-armv6/usr/bin/arm-linux-g++")

SET (CMAKE_FIND_ROOT_PATH "/usr/local/arm/4.3.1-eabi-armv6/")
SET (CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
SET (CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
SET (CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)

SET (LIBRARY_OUTPUT_PATH "/home/xxx/OpenCV-2.4.3/lib")
SET (OPENCV_CONFIG_FILE_INCLUDE_DIR "/home/xxx/OpenCV-2.4.3")
SET (OPENCV_WARNINGS_ARE_ERRORS OFF)

运行cmake命令和make命令后,出现以下错误:
In file included from /usr/local/arm/4.3.1-eabi-armv6/usr/bin-ccache/../lib/gcc/arm-samsung-linux-gnueabi/4.3.1/../../../../arm-samsung-linux-gnueabi/include/c++/4.3.1/bits/postypes.h:47,
             from /usr/local/arm/4.3.1-eabi-armv6/usr/bin-ccache/../lib/gcc/arm-samsung-linux-gnueabi/4.3.1/../../../../arm-samsung-linux-gnueabi/include/c++/4.3.1/iosfwd:47,
             from /usr/local/arm/4.3.1-eabi-armv6/usr/bin-ccache/../lib/gcc/arm-samsung-linux-gnueabi/4.3.1/../../../../arm-samsung-linux-gnueabi/include/c++/4.3.1/ios:44,
             from /usr/local/arm/4.3.1-eabi-armv6/usr/bin-ccache/../lib/gcc/arm-samsung-linux-gnueabi/4.3.1/../../../../arm-samsung-linux-gnueabi/include/c++/4.3.1/ostream:45,
             from /usr/local/arm/4.3.1-eabi-armv6/usr/bin-ccache/../lib/gcc/arm-samsung-linux-gnueabi/4.3.1/../../../../arm-samsung-linux-gnueabi/include/c++/4.3.1/iostream:45,
             from /home/zwang/OpenCV-2.4.3/3rdparty/openexr/Half/half.h:88,
             from /home/zwang/OpenCV-2.4.3/3rdparty/openexr/Half/half.cpp:48:
/usr/local/arm/4.3.1-eabi-armv6/usr/bin-ccache/../lib/gcc/arm-samsung-linux-gnueabi/4.3.1/../../../../arm-samsung-linux-gnueabi/include/c++/4.3.1/cwchar:52:24: error: wchar.h: No such file or directory

总结:编译器无法找到wchar.h,stdio.h,wctype.h,ctype.h。这些 header 位于/usr/local/arm/4.3.1-eabi-armv6/usr/include中。我想我需要使用cmake选项包括该文件夹。我怎样才能做到这一点?

最佳答案

您可以通过 include_directories 命令执行此操作:

include_directories(SYSTEM /usr/local/arm/4.3.1-eabi-armv6/usr/include)

一个更可靠的解决方案是在此路径中搜索 header ,如果找到该 header ,则包括目录,否则将失败。除了比将本地路径硬编码到CMakeLists.txt中更强大之外,另一个好处是它在CMake运行时而不是以后的构建时失败。最好使用 find_path 完成。

例如,您可以这样做:

find_path(WcharPath wchar.h PATHS /usr/local/arm/4.3.1-eabi-armv6/usr/include)
if(WcharPath)
  include_directories(SYSTEM ${WcharPath})
else()
  message(FATAL_ERROR "Failed to find wchar.h")
endif()

关于c++ - CMAKE选项包括一个目录,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/15209201/

10-13 09:41
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