RakeExampleBuildDirectory

Keybinding Markup

---
title: RakeExampleBuildDirectory
---

An example Rakefile which compiles a source tree in SRC\_DIR and outputs all objects to a build tree in OBJ\_DIR.

The OBJ_DIR can depend on arguments passed to rake, e.g.:

$ rake build
    
    gcc -c "src/foo/bar.c" -o "build/x86-gnuabi-Release/foo/bar.o"
    gcc -c "src/printf.c" -o "build/x86-gnuabi-Release/printf.o"
    mkdir -p dist/x86-gnuabi-Release
    gcc -o "dist/x86-gnuabi-Release/raketest.exe" build/x86-gnuabi-Release/foo/bar.o build/x86-gnuabi-Release/printf.o

$ rake CONFIG=Test build
    
    gcc -c "src/foo/bar.c" -o "build/x86-gnuabi-Test/foo/bar.o"
    gcc -c "src/printf.c" -o "build/x86-gnuabi-Test/printf.o"
    mkdir -p dist/x86-gnuabi-Test
    gcc -o "dist/x86-gnuabi-Test/raketest.exe" build/x86-gnuabi-Test/foo/bar.o build/x86-gnuabi-Test/printf.o

# Rakefile for output directory mapping example
    #
    require 'rake/clean'
    
    ## Tasks
    Dir['tasks/*.rake'].each { |f| import f }
    
    ##### Config ######
    PROJ = "raketest"
    CONFIG = ENV["CONFIG"] || "Release"
    
    ## Arch-ABI-Configuration
    ARCH = "x86"
    ABI = "abi"
    AAC = [ARCH, ABI, CONFIG].join('-')
    
    ##### Tools #####
    CC = "gcc"
    
    ##### Inputs ######
    SRC_DIR = "src"
    OBJ_DIR = File.join("build", AAC)
    DIST_DIR = File.join("dist", AAC)
    
    DIST_EXE = File.join(DIST_DIR, PROJ).ext('exe')
    
    
    C_SRCS = FileList["#{SRC_DIR}/*\*/\*.c"]
    
    ##### Outputs ######
    
    # Map sources to objects
    C\_OBJS = C\_SRCS.map { |f|
      f.sub(/^#{SRC\_DIR}/, OBJ\_DIR).ext('.o')
    }
    
    ##### Targets ######
    CLEAN.include C_OBJS
    CLEAN.include DIST_DIR
    
    directory OBJ_DIR
    directory DIST_DIR
    
    # Create output dirs for each include dir
    C_OBJS.each do |f|
      directory f.pathmap('%d')
    end
    
    task :default => :build
    
    desc "Build"
    task :build => DIST_EXE
    
    task :info do
      p C_SRCS
      p C_OBJS
      p DIST_EXE
    end
    
    ##### Rules ######
    
    ## CC
    rule '.o' => [
        proc { |tn| tn.sub(/#{OBJ\_DIR}/, SRC\_DIR).ext('.c') },
        '%d'
      ] do |t|
      sh %Q{#{CC} -c "#{t.source}" -o "#{t.name}"}
    end
    
    ## LD
    rule '.exe' => [*C_OBJS, '%d'] do |t|
      sh %Q{#{CC} -o "#{t.name}" #{C_OBJS}}
    end

# Notes

*   The example above does not handle object filepaths with spaces. See [RakeForMakeUsers][2].

[1]: RakeExampleBuildDirectory?action=sourceblock&num=1
 [2]: RakeForMakeUsers

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