ios - 如何为 armv6、armv7 和 i386 构建胖静态库

Question

我遵循了 Build fat static library (device + simulator) using Xcode and SDK 4+ 的指南构建 libmms ( https://github.com/kosher-penguin/xcode-libmms )，并得到一个胖静态库，但它似乎不起作用。将库添加到我的项目时出现错误(xCode4.2+iOS5.0):

Undefined symbols for architecture armv7:
  "_iconv_close", referenced from:
      _mms_connect in libMMS.a(mms.o)
  "_Status_GetNewStatusByKey", referenced from:
      _report_progress in libMMS.a(mms.o)
  "_Status_SetNewStatusByKey", referenced from:
      _report_progress in libMMS.a(mms.o)
  "_iconv", referenced from:
      _string_utf16 in libMMS.a(mms.o)
  "_iconv_open", referenced from:
      _mms_connect in libMMS.a(mms.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

首先，我从 https://github.com/kosher-penguin/xcode-libmms.git 克隆代码 其次，我用xCode4.2打开，在Run Script(Build Phases)中添加如下脚本，然后运行项目。 第三，我将名为 libmms.a 的文件复制到名为 Release-universal 的文件夹中，然后将库添加到新项目中。 第四，在新工程中，添加xcode-libmms工程的头文件，导入mms.h和mms_config.h，调用mms_connect函数，然后build，报错。

DEBUG_THIS_SCRIPT="false"

if [ $DEBUG_THIS_SCRIPT = "true" ]
then
echo "########### TESTS #############"
echo "Use the following variables when debugging this script; note that they may change on recursions"
echo "BUILD_DIR = $BUILD_DIR"
echo "BUILD_ROOT = $BUILD_ROOT"
echo "CONFIGURATION_BUILD_DIR = $CONFIGURATION_BUILD_DIR"
echo "BUILT_PRODUCTS_DIR = $BUILT_PRODUCTS_DIR"
echo "CONFIGURATION_TEMP_DIR = $CONFIGURATION_TEMP_DIR"
echo "TARGET_BUILD_DIR = $TARGET_BUILD_DIR"
fi

#####################[ part 1 ]##################
# First, work out the BASESDK version number (NB: Apple ought to report this, but they hide it)
#    (incidental: searching for substrings in sh is a nightmare! Sob)

SDK_VERSION=$(echo ${SDK_NAME} | grep -o '.\{3\}$')

# Next, work out if we're in SIM or DEVICE

if [ ${PLATFORM_NAME} = "iphonesimulator" ]
then
OTHER_SDK_TO_BUILD=iphoneos${SDK_VERSION}
else
OTHER_SDK_TO_BUILD=iphonesimulator${SDK_VERSION}
fi

echo "XCode has selected SDK: ${PLATFORM_NAME} with version: ${SDK_VERSION} (although back-targetting: ${IPHONEOS_DEPLOYMENT_TARGET})"
echo "...therefore, OTHER_SDK_TO_BUILD = ${OTHER_SDK_TO_BUILD}"
#
#####################[ end of part 1 ]##################

#####################[ part 2 ]##################
#
# IF this is the original invocation, invoke WHATEVER other builds are required
#
# Xcode is already building ONE target...
#
# ...but this is a LIBRARY, so Apple is wrong to set it to build just one.
# ...we need to build ALL targets
# ...we MUST NOT re-build the target that is ALREADY being built: Xcode WILL CRASH YOUR COMPUTER if you try this (infinite recursion!)
#
#
# So: build ONLY the missing platforms/configurations.

if [ "true" == ${ALREADYINVOKED:-false} ]
then
echo "RECURSION: I am NOT the root invocation, so I'm NOT going to recurse"
else
# CRITICAL:
# Prevent infinite recursion (Xcode sucks)
export ALREADYINVOKED="true"

echo "RECURSION: I am the root ... recursing all missing build targets NOW..."
echo "RECURSION: ...about to invoke: xcodebuild -configuration \"${CONFIGURATION}\" -target \"${TARGET_NAME}\" -sdk \"${OTHER_SDK_TO_BUILD}\" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO"
xcodebuild -configuration "${CONFIGURATION}" -target "${TARGET_NAME}" -sdk "${OTHER_SDK_TO_BUILD}" ${ACTION} RUN_CLANG_STATIC_ANALYZER=NO BUILD_DIR="${BUILD_DIR}" BUILD_ROOT="${BUILD_ROOT}"

ACTION="build"

#Merge all platform binaries as a fat binary for each configurations.

# Calculate where the (multiple) built files are coming from:
CURRENTCONFIG_DEVICE_DIR=${SYMROOT}/${CONFIGURATION}-iphoneos
CURRENTCONFIG_SIMULATOR_DIR=${SYMROOT}/${CONFIGURATION}-iphonesimulator

echo "Taking device build from: ${CURRENTCONFIG_DEVICE_DIR}"
echo "Taking simulator build from: ${CURRENTCONFIG_SIMULATOR_DIR}"

CREATING_UNIVERSAL_DIR=${SYMROOT}/${CONFIGURATION}-universal
echo "...I will output a universal build to: ${CREATING_UNIVERSAL_DIR}"

# ... remove the products of previous runs of this script
#      NB: this directory is ONLY created by this script - it should be safe to delete!

rm -rf "${CREATING_UNIVERSAL_DIR}"
mkdir "${CREATING_UNIVERSAL_DIR}"

#
echo "lipo: for current configuration (${CONFIGURATION}) creating output file: ${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}"
lipo -create -output "${CREATING_UNIVERSAL_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_DEVICE_DIR}/${EXECUTABLE_NAME}" "${CURRENTCONFIG_SIMULATOR_DIR}/${EXECUTABLE_NAME}"

#########
#
# Added: StackOverflow suggestion to also copy "include" files
#    (untested, but should work OK)
#
if [ -d "${CURRENTCONFIG_DEVICE_DIR}/usr/local/include" ]
then
mkdir -p "${CREATING_UNIVERSAL_DIR}/usr/local/include"
# * needs to be outside the double quotes?
cp "${CURRENTCONFIG_DEVICE_DIR}/usr/local/include/"* "${CREATING_UNIVERSAL_DIR}/usr/local/include"
fi
fi

请给我一些帮助，谢谢。

更新: 添加libiconv库后，报错如下:

Undefined symbols for architecture armv7:
  "_Status_GetNewStatusByKey", referenced from:
      _report_progress in libMMS.a(mms.o)
  "_Status_SetNewStatusByKey", referenced from:
      _report_progress in libMMS.a(mms.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Answer 1

其中一个问题是您的库依赖于 libiconv。当您使用您的库时，您不应该只添加 libMMS，还应该添加 libiconv，它随任何 XCode 安装一起提供。参见 libiconv not linking to iOS project了解如何将其添加到项目中。

我不知道什么依赖_Status_GetNewStatusByKey和_Status_SetNewStatusByKey。它们可能相似。

更新:

第二个问题是 mms.c 中的函数 report_progress() 使用了函数 Status_GetNewStatusByKey 和 Status_SetNewStatusByKey，似乎没有在任何地方定义(编译库时没有收到警告吗？)。删除声明、定义或使用 report_progress() 的所有内容。无论如何，它已在最新版本的 libmms 中删除。