CODEWITHSUNDEEP
cmakefilecmakebisonflex-lexer
Niklas Rosencrantz
Niklas Rosencrantz

Reputation: 26647

CMake with flex/bison in CLion

I'm trying to translate a Makefile into CMakeLists.txt.

Makefile which works

fb1-5:  fb1-5.l fb1-5.y
    bison -d fb1-5.y
    flex fb1-5.l
    cc -o $@ fb1-5.tab.c lex.yy.c -lfl

CMakeLists.txt attempt

cmake_minimum_required(VERSION 3.7)
project(calc)

set(CMAKE_C_STANDARD 99)

FIND_PACKAGE(BISON REQUIRED)
SET(BisonOutput ${CMAKE_SOURCE_DIR}/parser.c)
IF(BISON_FOUND)
    ADD_CUSTOM_COMMAND(
            OUTPUT ${BisonOutput}
            COMMAND ${BISON_EXECUTABLE}
            -d
            ${CMAKE_SOURCE_DIR}/fb1-5.y
            COMMENT "Generating parser.c"
    )
ENDIF()

FIND_PACKAGE(FLEX REQUIRED)
SET(FlexOutput ${CMAKE_SOURCE_DIR}/scanner.c)
IF(FLEX_FOUND)
    ADD_CUSTOM_COMMAND(
            OUTPUT ${FlexOutput}
            COMMAND ${FLEX_EXECUTABLE}
            ${CMAKE_SOURCE_DIR}/fb1-5.l
            COMMENT "Generating fb1-5.l"
    )
ENDIF()

ADD_LIBRARY(calc ${BisonOutput} ${FlexOutput})

It says it finds bison and flex in 

-- Found BISON: /usr/bin/bison (found version "3.0.4") 
-- Found FLEX: /usr/bin/flex (found version "2.6.0")

But my CMake script won't generate an executable. How should I define "executable" and how can I make the CMake build script work in CLion?

Upvotes: 1

Views: 3332

Answers (1)

Dr. Alex RE
Dr. Alex RE

Reputation: 1698

But my CMake script won't generate an executable. How should I define "executable" and how can I make the CMake build script work in CLion?

I think you should at least do something like this:

add_executable(fb1-5
  ${BisonOutput}
  ${FlexOutput}
)

See add_executable.

Upvotes: 3

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