问题描述
我使用 cmake 进行交叉编译.在我的工具链文件中有一行
I use cmake for cross compiling. In my toolchain file there is a line
SET(CMAKE_C_FLAGS "-std=gnu99")
CMakeLists.txt 中不再设置此变量.
This variable is not set in CMakeLists.txt again.
当我运行 cmake -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake .. 这个标志被忽略.
When I run cmake -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake .. this flag is ignored.
更详细:flags.cmake 行显示了一个空的 C_FLAGS = 行.但是在 CMakeOutput.log 中，我可以找到一行 Build flags: -std=gnu99.
To be more detailed: The line of flags.cmake shows an empty C_FLAGS = line.But in CMakeOutput.log I can find a line Build flags: -std=gnu99.
我发现第二次运行 cmake ..(无论是否指定工具链文件都一样)修复了这个问题.
I found out that a second run of cmake .. (same with or without toolchain file specified) fixes this problem.
但是为什么我第一次运行 cmake 时没有设置??
But why is it not set the first time i run cmake ??
添加了 MNWE
CMakeLists.txt:
cmake_minimum_required(VERSION 2.6)
project(myproject)
SET(files src/main.c)
add_executable(myexec ${files})
avr.cmake:
SET(CMAKE_SYSTEM_NAME Generic)
SET(CMAKE_C_COMPILER avr-gcc)
SET(CMAKE_C_FLAGS "-std=gnu99")
推荐答案
我找到了一个临时解决方案，通过替换该行
I've found a temporary solution by replacing the line
SET(CMAKE_C_FLAGS "-std=gnu99")
由
SET(CMAKE_C_FLAGS "-std=gnu99" CACHE STRING "" FORCE)
这篇关于CMake 交叉编译:忽略工具链文件中的 C 标志的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！