CMake的交叉编译:从工具链文件C标志忽略 [英] CMake cross-compiling: C flags from toolchain file ignored
问题描述
我使用的CMake进行交叉编译。在我的工具链文件中有一条线
SET(CMAKE_C_FLAGS-std = gnu99)
此变量没有设置的CMakeLists.txt一次。
当我运行 cmake的-DCMAKE_TOOLCHAIN_FILE = toolchain.cmake ..
此标志将被忽略。
要更加细化: flags.cmake
的行显示一个空的 C_FLAGS =
行。
但在 CMakeOutput.log
我能找到一个行构建标志:-std = gnu99
我发现 cmake的..
的第二次运行(与相同或不指定工具链文件)修复了这个问题。
但它为什么不设置我第一次运行cmake ??
编辑:添加MNWE
的CMakeLists.txt:
cmake_minimum_required(版本2.6)
项目(MyProject的)SET(文件的src / main.c中)add_executable(myexec $ {}文件)
avr.cmake:
SET(CMAKE_SYSTEM_NAME通用)SET(CMAKE_C_COMPILER AVR-GCC)SET(CMAKE_C_FLAGS-std = gnu99)
我发现通过更换就行了临时的解决方案
SET(CMAKE_C_FLAGS-std = gnu99)
按
SET(CMAKE_C_FLAGS-std = gnu99CACHE字符串FORCE)
I use cmake for cross compiling. In my toolchain file there is a line
SET(CMAKE_C_FLAGS "-std=gnu99")
This variable is not set in CMakeLists.txt again.
When I run cmake -DCMAKE_TOOLCHAIN_FILE=toolchain.cmake ..
this flag is ignored.
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
.
I found out that a second run of cmake ..
(same with or without toolchain file specified) fixes this problem.
But why is it not set the first time i run cmake ??
EDIT: Added 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")
I've found a temporary solution by replacing the line
SET(CMAKE_C_FLAGS "-std=gnu99")
by
SET(CMAKE_C_FLAGS "-std=gnu99" CACHE STRING "" FORCE)
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