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我有一个带有 automake 构建系统的项目,那里有 flex/bison 文件。现在我不明白如何将它们包含到 cmake 构建系统中。我正在尝试手动执行此操作。这是项目树:

+ROOT
|---CMakeLists.txt
|---Sources/
|   |---Flex
|   |---Main
|   |---CMakeLists.txt
|---Includes/

文件夹中Flex有 2 个文件:player_command_parser.ypp; player_command_tok.lpp. 这些文件来自RoboCup 足球服务器

我真的不知道如何在新的构建系统中使用它们,所以我决定手动生成所有文件:

flex --c++ player_command_tok.lpp 

此命令生成lex.RCSSPCom.cc以以下代码开头:

#line 3 "lex.RCSSPCom.cc"

#define  YY_INT_ALIGNED short int

/* A lexical scanner generated by flex */

#define FLEX_SCANNER
#define YY_FLEX_MAJOR_VERSION 2
#define YY_FLEX_MINOR_VERSION 5
#define YY_FLEX_SUBMINOR_VERSION 35
#if YY_FLEX_SUBMINOR_VERSION > 0
#define FLEX_BETA
#endif

    /* The c++ scanner is a mess. The FlexLexer.h header file relies on the
     * following macro. This is required in order to pass the c++-multiple-scanners
     * test in the regression suite. We get reports that it breaks inheritance.
     * We will address this in a future release of flex, or omit the C++ scanner
     * altogether.
     */
    #define yyFlexLexer RCSSPComFlexLexer

下一步是:bison -d player_command_parser.ypp

我有:player_command_parser.tab.cpp; player_command_parser.tab.hpp

现在我正在尝试将所有生成的文件复制到相关文件夹:*.tab.hpp -> 包含,并将 cc&cpp 文件添加到Sources/CMakeLists.txt

set (FlexSources
    Server/Flex/lex.RCSSPCom.cc
    Server/Flex/player_command_parser.tab.cpp
)

和编译输出:

[  1%] Building CXX object Sources/Flex/lex.RCSSPCom.cc.o
In file included from /Includes/player_command_tok.h:31:0,
                 from player_command_tok.lpp:28:
/usr/include/FlexLexer.h:112:7: error: redefinition of ‘class RCSSPComFlexLexer’
/usr/include/FlexLexer.h:112:7: error: previous definition of ‘class RCSSPComFlexLexer’

有什么问题?

4

1 回答 1

2

您的编译错误似乎是由于某些标头被包含两次。您可能需要制作一个仅是包含保护的额外文件:

player_command_tok_guarded.hpp:

#ifndef PLAYER_COMMAND_TOK_GUARDED
#define PLAYER_COMMAND_TOK_GUARDED
#include "player_command_tok.hpp"
#endif

并将您的#include文件改为这个新文件。至于将 flex 和 bison 集成到您的 CMake 系统中,请尝试以下操作:

# Find flex and bison.
find_program(FLEX flex DOC "Path to the flex lexical analyser generator.")
if(NOT ${FLEX})
  message(SEND_ERROR "Flex not found.")
endif
find_program(BISON bison DOC "Path to the bison parser generator.")
if(NOT ${BISON})
  message(SEND_ERROR "Bison not found.")
endif

# Custom commands to invoke flex and bison.
add_custom_command(OUTPUT lex.RCSSPCom.cc
                   COMMAND ${FLEX} --c++ player_command_tok.lpp 
                   MAIN_DEPENDENCY player_command_tok.lpp
                   COMMENT "Generating lexer"
                   VERBATIM)
add_custom_command(OUTPUT player_command_parser.tab.cpp player_command_parser.tab.hpp
                   COMMAND ${BISON} -d player_command_parser.ypp
                   MAIN_DEPENDENCY player_command_parser.ypp
                   COMMENT "Generating parser"
                   VERBATIM)

并像往常一样将文件添加到您的文件列表中。

于 2012-06-12T11:01:47.463 回答