c++ - 使用#define 和 clang 为 info.plist 创建版本号变化？

Question

多年前，当使用 GCC 编译时，#include .h 文件中的以下定义可以被预处理以用于 info.plist:

#define MAJORVERSION 2
#define MINORVERSION 6 
#define MAINTVERSION 4

<key>CFBundleShortVersionString</key> <string>MAJORVERSION.MINORVERSION.MAINTVERSION</string>

...这将变成“2.6.4”。之所以有效，是因为 GCC 支持“-traditional”标志。 (参见 Tech Note TN2175 Info.plist files in Xcode Using the C Preprocessor，在“消除宏扩展过程中标记之间的空白”下)

然而，快进到 2016 年，Clang 7.0.2 (Xcode 7.2.1) 显然不支持“-traditional”或“-traditional-cpp”(或正确支持它)，产生此字符串:

"2 . 6 . 4"

(参见 Bug 12035 - Preprocessor inserts spaces in macro expansions, comment 4)

因为有这么多不同的变体(CFBundleShortVersionString、CFBundleVersion、CFBundleGetInfoString)，最好解决这个 clang 问题，定义一次，然后将各个部分连接/串接在一起。现在普遍接受的这样做的模式是什么？ (我目前正在 MacOS 上构建，但同样的模式也适用于 IOS)

Answer 1

这是我用来增加内部版本号的 Python 脚本，只要检测到源代码更改，并更新项目中的一个或多个 Info.plist 文件。

它的创建是为了解决 this question 中提出的问题我刚才问过。

您需要在源代码树中创建如下所示的 buildnum.ver 文件:

version 1.0
build 1

(当达到某些项目里程碑时，您需要手动增加 version，但 buildnum 会自动增加)。

注意 .ver 文件的位置必须在源代码树的根目录中(参见下面的 SourceDir)作为此脚本将在此目录中查找修改过的文件。如果找到任何内容，则内部版本号会递增。修改意味着源文件在 .ver 文件最后更新后发生变化。

然后创建一个新的 Xcode 目标来运行外部构建工具并运行如下内容:

tools/bump_buildnum.py SourceDir/buildnum.ver SourceDir/Info.plist

(让它在${PROJECT_DIR}中运行)

然后使所有实际的 Xcode 目标都依赖于此目标，因此它会在构建任何目标之前运行。

#!/usr/bin/env python
#
# Bump build number in Info.plist files if a source file have changed.
#
# usage: bump_buildnum.py buildnum.ver Info.plist [ ... Info.plist ]
#
# andy@trojanfoe.com, 2014.
#

import sys, os, subprocess, re

def read_verfile(name):
    version = None
    build = None
    verfile = open(name, "r")
    for line in verfile:
        match = re.match(r"^version\s+(\S+)", line)
        if match:
            version = match.group(1).rstrip()
        match = re.match(r"^build\s+(\S+)", line)
        if match:
            build = int(match.group(1).rstrip())
    verfile.close()
    return (version, build)

def write_verfile(name, version, build):
    verfile = open(name, "w")
    verfile.write("version {0}\n".format(version))
    verfile.write("build {0}\n".format(build))
    verfile.close()
    return True

def set_plist_version(plistname, version, build):
    if not os.path.exists(plistname):
        print("{0} does not exist".format(plistname))
        return False

    plistbuddy = '/usr/libexec/Plistbuddy'
    if not os.path.exists(plistbuddy):
        print("{0} does not exist".format(plistbuddy))
        return False

    cmdline = [plistbuddy,
        "-c", "Set CFBundleShortVersionString {0}".format(version),
        "-c", "Set CFBundleVersion {0}".format(build),
        plistname]
    if subprocess.call(cmdline) != 0:
        print("Failed to update {0}".format(plistname))
        return False

    print("Updated {0} with v{1} ({2})".format(plistname, version, build))
    return True

def should_bump(vername, dirname):
    verstat = os.stat(vername)
    allnames = []
    for dirname, dirnames, filenames in os.walk(dirname):
        for filename in filenames:
            allnames.append(os.path.join(dirname, filename))

    for filename in allnames:
        filestat = os.stat(filename)
        if filestat.st_mtime > verstat.st_mtime:
            print("{0} is newer than {1}".format(filename, vername))
            return True

    return False

def upver(vername):
    (version, build) = read_verfile(vername)
    if version == None or build == None:
        print("Failed to read version/build from {0}".format(vername))
        return False

    # Bump the version number if any files in the same directory as the version file
    # have changed, including sub-directories.
    srcdir = os.path.dirname(vername)
    bump = should_bump(vername, srcdir)

    if bump:
        build += 1
        print("Incremented to build {0}".format(build))
        write_verfile(vername, version, build)
        print("Written {0}".format(vername))
    else:
        print("Staying at build {0}".format(build))

    return (version, build)

if __name__ == "__main__":
    if os.environ.has_key('ACTION') and os.environ['ACTION'] == 'clean':
        print("{0}: Not running while cleaning".format(sys.argv[0]))
        sys.exit(0)

    if len(sys.argv) < 3:
        print("Usage: {0} buildnum.ver Info.plist [... Info.plist]".format(sys.argv[0]))
        sys.exit(1)
    vername = sys.argv[1]

    (version, build) = upver(vername)
    if version == None or build == None:
        sys.exit(2)

    for i in range(2, len(sys.argv)):
        plistname = sys.argv[i]
        set_plist_version(plistname, version, build)        

    sys.exit(0)