Use premake4 to generate iOS .xcodeproj files

premake4.lua

solution "example"
    language "C++"
    configurations { "Debug", "Release" }
    flags { "ExtraWarnings", "StaticRuntime" }

    -- if you used Homebrew to install boost to these locations...
    if _ACTION == "xcode3" then
        includedirs { "/usr/local/include" }
        libdirs { "/usr/local/lib" }
    end

    configuration "Debug"
        defines { "DEBUG" }
        flags { "Symbols" }
        targetdir "build/Debug"

    configuration "Release"
        defines { "NDEBUG" }
        flags { "Optimize" }
        targetdir "build/Release"

    project "lib"
        kind "StaticLib"
        files { "lib/**.cpp", "lib/**.h", "lib/**.hpp" }

    project "app"
        kind "ConsoleApp"
        files { "app/*" }
        files { "app/en.lproj" }

        includedirs { "lib" }
        links { "lib" }

        linkoptions
            { "-framework OpenGLES"
            , "-framework QuartzCore"
            , "-framework UIKit"
            , "-framework Foundation"
            , "-framework CoreGraphics"
            }

Rakefile

# Usage:
# In premake4.lua use StaticLib for libraries; ConsoleApp for applications.
# Then run `rake xcode && rake xcodebuild`

ENV_DEFAULTS = {
    'CONFIGURATION' => "Debug",
    'SDK' => "iphonesimulator",
}

SDK_TO_ARCH = {
    "iphonesimulator" => "i386",
    "iphoneos" => "armv7",
}

# These projects will be converted to iOS applications. These 
# should be the ones you specified ConsoleApp in premake4.lua
APP_PROJECTS = %w(app1 app2)
APP_XCODEPROJS = APP_PROJECTS.map { |x| "#{x}.xcodeproj" }

ENV_DEFAULTS.each {|k, v| ENV[k] = v if !ENV[k] }

def xcode_to_ios pbxproj
    lines = IO.readlines(pbxproj).select do |l|
        not l =~ /PREBINDING =/ and not l =~ /GCC_ENABLE_FIX_AND_CONTINUE =/
    end.map do |l|
        l.
            gsub("$(NATIVE_ARCH_ACTUAL)", "$(ARCHS_STANDARD_32_BIT)").
            gsub("objectVersion = 45", "objectVersion = 46")
    end.map do |l|
        l =~ /PRODUCT_NAME =/ ?  [l,
            %(CODE_SIGN_IDENTITY = "iPhone Developer";),
            %(PROVISIONING_PROFILE = "";),
            %(SDKROOT = iphoneos;)] : l
    end.flatten
    open(pbxproj, 'w') {|f| f.puts lines }
end

def xcode_to_app pbxproj
    lines = IO.readlines(pbxproj).map do |l|
        l.gsub("com.apple.product-type.tool", "com.apple.product-type.application")
    end
    open(pbxproj, 'w') {|f| f.puts lines }
end

def run cmd
    puts cmd
    system cmd
end

desc "Create Xcode build files."
task :xcode do
    run "premake4 clean"
    run "premake4 xcode3"
    Dir["*.xcodeproj"].each { |xc| xcode_to_ios "#{xc}/project.pbxproj" }
    APP_XCODEPROJS.each { |xc| xcode_to_app "#{xc}/project.pbxproj" }
end

desc "Run xcodebuild command. See ENV_DEFAULTS for a list."
task :xcodebuild do
    APP_XCODEPROJS.each do |xc|
        run(%(xcodebuild -project #{xc} -configuration #{ENV['CONFIGURATION']} ) +
            %(-sdk #{ENV['SDK']} -arch #{SDK_TO_ARCH[ENV['SDK']]}))
    end
end