Question

我需要替换CMake列表中的值，但似乎没有任何支持此列表操作。

我想出了这段代码：

macro (LIST_REPLACE LIST INDEX NEWVALUE)
    list (REMOVE_AT ${LIST} ${INDEX})
    list (LENGTH ${LIST} __length)

    # Cannot insert at the end
    if (${__length} EQUAL ${INDEX})
        list (APPEND ${LIST} ${NEWVALUE})
    else (${__length} EQUAL ${INDEX})
        list (INSERT ${LIST} ${INDEX} ${NEWVALUE})
    endif (${__length} EQUAL ${INDEX})
endmacro (LIST_REPLACE)

# Example
set (fubar A;B;C)
LIST_REPLACE (fubar 2 "X")
message (STATUS ${fubar})

你有更好的想法如何实现这个目标吗？

Answer 1

如果要用列表中的值替换项目，可以执行以下代码：

macro(replace_list_item LIST OLD_VALUE NEW_VALUE)
    list(FIND ${LIST} ${OLD_VALUE} OLD_VALUE_INDEX)
    if(OLD_VALUE_INDEX GREATER_EQUAL 0)
        list(REMOVE_AT ${LIST} ${OLD_VALUE_INDEX})
        list(INSERT ${LIST} ${OLD_VALUE_INDEX} ${NEW_VALUE})
    endif()
endmacro()

示例：

set(OPENCV_OPTIONS "")
list(APPEND OPENCV_OPTIONS -D WITH_ADE=ON)
list(APPEND OPENCV_OPTIONS -D WITH_CUDA=OFF)
list(APPEND OPENCV_OPTIONS -D WITH_EIGEN=ON)

# Old OPENCV_OPTIONS: -D;WITH_ADE=ON;-D;WITH_CUDA=OFF;-D;WITH_EIGEN=ON
message("Old OPENCV_OPTIONS: ${OPENCV_OPTIONS}")

replace_list_item(OPENCV_OPTIONS "WITH_CUDA=OFF" "WITH_CUDA=ON")

# New OPENCV_OPTIONS: -D;WITH_ADE=ON;-D;WITH_CUDA=ON;-D;WITH_EIGEN=ON
message("New OPENCV_OPTIONS: ${OPENCV_OPTIONS}")

替换CMake列表中的值

2 个答案: