从makefile到CMake的通用规则

Question

我试图将流动的vanilla makefile行"转换"为CMake语法.

SRCS = $(wildcard *.foo)
OBJS = $(SRCS:.foo=.bar)

my_rule: $(OBJS)

%.bar: %.foo
    make_bar_from_foo  $@  $<

工作丑陋的尝试

FILE(GLOB SRCS "*.foo")
SET(outFiles)
FOREACH(SRC ${SRCS})
    SET(OUTPUT_FILE_NAME "${SRC}.bar")

    ADD_CUSTOM_COMMAND(
      OUTPUT "${OUTPUT_FILE_NAME}"
      COMMAND make_bar_from_foo ${SRC} ${OUTPUT_FILE_NAME}
      DEPENDS "${SRC}")

    SET(outFiles ${outFiles} "${OUTPUT_FILE_NAME}")
ENDFOREACH(SRC)
ADD_CUSTOM_TARGET(my_rule ALL DEPENDS ${outFiles})

我知道它会为每个文件生成一个命令而不是通用的.最简单/最干净的方法吗？

Answer 1

在CMake中,您始终可以声明自己的编译器语言.所以在你的情况下你可以这样做:

cmake_minimum_required(VERSION 2.8)

project(MakeBarFromFoo NONE)

set(
   CMAKE_FOO_COMPILE_OBJECT 
       "make_bar_from_foo <SOURCE> <OBJECT>"
)

file(GLOB SRCS "*.foo")
add_library(my_rule OBJECT ${SRCS})
set_source_files_properties(${SRCS} PROPERTIES LANGUAGE FOO)

然后,您可以像使用其他对象库目标一样使用它.但是.bar如果你enable_language(FOO)(这需要更多的工作,请参见下文),你只会得到像扩展名这样的东西.

通过CMake自身提供的例子是ASM或RC编译器.

该enable_language(FOO)版本

这需要另外四个文件,例如项目的CMake文件夹:

CMake的\ CMakeDetermineFOOCompiler.cmake

# Find the compiler
find_program(
    CMAKE_FOO_COMPILER 
        NAMES "make_bar_from_foo" 
        HINTS "${CMAKE_SOURCE_DIR}"
        DOC "FOO compiler" 
)
mark_as_advanced(CMAKE_FOO_COMPILER)

set(CMAKE_FOO_SOURCE_FILE_EXTENSIONS foo;FOO)
set(CMAKE_FOO_OUTPUT_EXTENSION .bar)
set(CMAKE_FOO_COMPILER_ENV_VAR "FOO")

# Configure variables set in this file for fast reload later on
configure_file(${CMAKE_CURRENT_LIST_DIR}/CMakeFOOCompiler.cmake.in
               ${CMAKE_PLATFORM_INFO_DIR}/CMakeFOOCompiler.cmake)

CMake的\ CMakeFOOCompiler.cmake.in

set(CMAKE_FOO_COMPILER "@CMAKE_FOO_COMPILER@")
set(CMAKE_FOO_COMPILER_LOADED 1)
set(CMAKE_FOO_SOURCE_FILE_EXTENSIONS @CMAKE_FOO_SOURCE_FILE_EXTENSIONS@)
set(CMAKE_FOO_OUTPUT_EXTENSION @CMAKE_FOO_OUTPUT_EXTENSION@)
set(CMAKE_FOO_COMPILER_ENV_VAR "@CMAKE_FOO_COMPILER_ENV_VAR@")

CMake的\ CMakeFOOInformation.cmake

# This file sets the basic flags for the FOO compiler
if(NOT CMAKE_FOO_COMPILE_OBJECT)
    set(CMAKE_FOO_COMPILE_OBJECT "<CMAKE_FOO_COMPILER> <SOURCE> <OBJECT>")
endif()
set(CMAKE_FOO_INFORMATION_LOADED 1)

CMake的\ CMakeTestFOOCompiler.cmake

# For now just do nothing in here
set(CMAKE_FOO_COMPILER_WORKS 1 CACHE INTERNAL "")

然后你的CMakeLists.txt文件看起来像这样:

的CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

project(MakeBarFromFoo NONE)

list(APPEND CMAKE_MODULE_PATH "${CMAKE_SOURCE_DIR}/CMake")
enable_language(FOO)

file(GLOB SRCS "*.foo")
add_library(my_rule OBJECT ${SRCS})