如何为armv6、armv7和i386构建脂肪静态库

Question

我按照Build fat static library (device + simulator) using Xcode and SDK 4+的指南构建了libmms ( https://github.com/kosher-penguin/xcode-libmms )，得到了一个很好的静态库，但它似乎不起作用。将库添加到我的项目(xCode4.2+iOS5.0)时出现了错误：

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，然后用xCode4.2打开它，然后添加下面的脚本来运行脚本(构建阶段)，然后运行项目。第三，我在名为的文件夹中复制名为libmms.a的文件，然后将库添加到一个新项目中。第四，在新项目中，从xcode-libmms项目中添加头文件，导入mms.h和mms_config.h，并调用函数mms_connect，然后构建它，但得到错误。

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，错误如下：

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，您不应该仅仅添加libMMS，还应该添加libiconv，这与任何XCode安装一起提供。有关如何将其添加到项目中，请参见libiconv not linking to iOS project。

我不知道什么是依赖_Status_GetNewStatusByKey和_Status_SetNewStatusByKey。他们可能是相似的。

更新：

第二个问题是mms.c中的函数Status_GetNewStatusByKey和Status_SetNewStatusByKey，它们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，它已经在最新版本的libmms中被删除了。