FLEX/BISON 在不同文件夹中生成 location.hh、position.hh、stack.hh

Question

我有这样的文件夹结构

include/
src/
 | parser.yy
 | scanner.ll

并在

src/CMakeLists.txt

：

SET(BisonOutput ${CMAKE_SOURCE_DIR}/src/_parser.cpp)

IF(BISON_FOUND)
    ADD_CUSTOM_COMMAND(
      OUTPUT ${BisonOutput}
      COMMAND ${BISON_EXECUTABLE}
              --defines=${CMAKE_SOURCE_DIR}/include/_parser.hpp
              --output=${BisonOutput}
              ${CMAKE_SOURCE_DIR}/src/parser.yy
      COMMENT "Generating parser"
    )
ENDIF()

SET(FlexOutput ${CMAKE_SOURCE_DIR}/src/_scanner.cpp)

IF(FLEX_FOUND)
    ADD_CUSTOM_COMMAND(
      OUTPUT ${FlexOutput}
      COMMAND ${FLEX_EXECUTABLE}
              --outfile=${FlexOutput}
              ${CMAKE_SOURCE_DIR}/src/scanner.ll
      COMMENT "Generating scanner"
    )
ENDIF()

但是，文件locations.hh、position.hh 和stack.hh 是在

src

目录内生成的。是否可以以某种方式指定我希望在

include

目录中生成这些文件？

我正在使用 Bison 3.0.4 和 Flex 2.6.4

Answer 1

我不确定 Bison/Flex 是否允许您在单独的位置生成它们，但生成后您可以使用 CMake 将它们复制到

include

目录。使用 add_custom_command

 添加另一个 

PRE_BUILD 调用，以确保它们在构建目标之前被复制：

ADD_CUSTOM_COMMAND(
    TARGET MyTarget PRE_BUILD
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_SOURCE_DIR}/src/locations.hh ${CMAKE_SOURCE_DIR}/include
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_SOURCE_DIR}/src/position.hh ${CMAKE_SOURCE_DIR}/include
    COMMAND ${CMAKE_COMMAND} -E copy ${CMAKE_SOURCE_DIR}/src/stack.hh ${CMAKE_SOURCE_DIR}/include
)

Answer 2

CMake 确实添加了对 Flex 和 Bison 的支持。

这是一个例子：

...

find_package(BISON)

bison_target(name_of_my_parser
${CMAKE_CURRENT_SOURCE_DIR}/parser.ypp
${CMAKE_CURRENT_BINARY_DIR}/parser.cpp
DEFINES_FILE
${CMAKE_CURRENT_BINARY_DIR}/parser.hpp)


find_package(FLEX)

bison_target(name_of_my_lexer
${CMAKE_CURRENT_SOURCE_DIR}/lexer.l
${CMAKE_CURRENT_BINARY_DIR}/lexer.cpp
DEFINES_FILE
${CMAKE_CURRENT_BINARY_DIR}/lexer.h)

include_directories( ${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR} )

add_executable(a_program
...#include other source files
${BISON_name_of_my_parser_OUTPUTS}  # macro defined by cmake
${LEXER_name_of_my_lexer_OUTPUTS})  # macro defined by cmake

...

这假设

src/
 | parser.ypp
 | lexer.l