cmake：如何为野牛使用自定义可执行路径

问题描述

我想将cmake指向特定位置，以在特定平台上找到Bison可执行文件。有没有办法做到这一点？

I would like to point cmake to a specific location to find the Bison executable on a specific platform. Is there a way to do this?

if(PLATFORM STREQUAL "Darwin")
  find_package(
    BISON 3.0.0 REQUIRED
    # Would like to do something like:
    PATH "/usr/local/opt/bison/bin/bison"
    )
else()
  find_package(
    BISON 3.0.0 REQUIRED
    )
endif()
if(BISON_FOUND)
  BISON_TARGET(
    Parser
    ${CMAKE_CURRENT_LIST_DIR}/Parser.yy
    ${CMAKE_CURRENT_BINARY_DIR}/Parser.cpp
    )
  target_sources(
    MyLib PRIVATE
    ${BISON_Parser_OUTPUTS}
    )
endif()

推荐答案

根据对于模块 FindBISON.cmake ，此模块设置了变量 BISON_EXECUTABLE 指向程序的可执行文件。

According to documentation for module FindBISON.cmake, this module sets variable BISON_EXECUTABLE pointed to the program's executable.

实际上，这是缓存变量，该变量设置为具有以下内容的脚本： 调用。因此，您可以手动为修复可执行文件设置此缓存变量：

Actually, this is cached variable, which is set be the script with find_program call. So you may set this cached variable manually for fix executable:

if(PLATFORM STREQUAL "Darwin")
    set(BISON_EXECUTABLE "/usr/local/opt/bison/bin/bison" CACHE PATH "Bison executable")
endif()
...
find_package(BISON 3.0.0 REQUIRED)

---

请注意，文档中针对不同脚本列出的变量<$在

---

Note, that variables listed in documentation for different scripts FindXXX.cmake under

不需要缓存，因此设置它们会影响结果。例如，在同一文档中为 FindBISON.cmake 列出的变量 BISON_VERSION 未缓存，因此您可能无法重新定义它影响脚本。

don't need to be cached, so setting them will affect on result. E.g., variable BISON_VERSION listed in the same documentation for FindBISON.cmake is not cached, so you may not redefine it for affect on the script.

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