使用 Xcode 调试链接器错误 - sdl 静态库

Question

我正在尝试按照此处的指南为 iOS 构建 SDL2：

http://lazyfoo.net/tutorials/SDL/52_hello_mobile/ios_mac/index.php

我能够构建 libSDL2.a 静态库，但是当我尝试构建使用它的示例 hello world 应用程序时，出现 linker 错误。

Ld /Users/testuser/Library/Developer/Xcode/DerivedData/___PROJECTNAME___-egvszvnfjpicgqdtaazpczjuebut/Build/Products/Debug-iphonesimulator/___PROJECTNAME___.app/___PROJECTNAME___ normal x86_64
    cd "/Users/testuser/Documents/iosBuild/SDL iOS Application"
    export IPHONEOS_DEPLOYMENT_TARGET=10.0
    export PATH="/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/usr/bin:/Applications/Xcode.app/Contents/Developer/usr/bin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
    /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/clang -arch x86_64 -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.0.sdk -L/Users/testuser/Library/Developer/Xcode/DerivedData/___PROJECTNAME___-egvszvnfjpicgqdtaazpczjuebut/Build/Products/Debug-iphonesimulator -F/Users/testuser/Library/Developer/Xcode/DerivedData/___PROJECTNAME___-egvszvnfjpicgqdtaazpczjuebut/Build/Products/Debug-iphonesimulator -filelist /Users/testuser/Library/Developer/Xcode/DerivedData/___PROJECTNAME___-egvszvnfjpicgqdtaazpczjuebut/Build/Intermediates/___PROJECTNAME___.build/Debug-iphonesimulator/___PROJECTNAME___.build/Objects-normal/x86_64/___PROJECTNAME___.LinkFileList -mios-simulator-version-min=10.0 -Xlinker -object_path_lto -Xlinker /Users/testuser/Library/Developer/Xcode/DerivedData/___PROJECTNAME___-egvszvnfjpicgqdtaazpczjuebut/Build/Intermediates/___PROJECTNAME___.build/Debug-iphonesimulator/___PROJECTNAME___.build/Objects-normal/x86_64/___PROJECTNAME____lto.o -Xlinker -export_dynamic -Xlinker -no_deduplicate -Xlinker -objc_abi_version -Xlinker 2 -lSDL2 -framework GameController -framework Foundation -framework UIKit -framework OpenGLES -framework QuartzCore -framework CoreAudio -framework AudioToolbox -framework CoreGraphics -framework CoreMotion -Xlinker -dependency_info -Xlinker /Users/testuser/Library/Developer/Xcode/DerivedData/___PROJECTNAME___-egvszvnfjpicgqdtaazpczjuebut/Build/Intermediates/___PROJECTNAME___.build/Debug-iphonesimulator/___PROJECTNAME___.build/Objects-normal/x86_64/___PROJECTNAME____dependency_info.dat -o /Users/testuser/Library/Developer/Xcode/DerivedData/___PROJECTNAME___-egvszvnfjpicgqdtaazpczjuebut/Build/Products/Debug-iphonesimulator/___PROJECTNAME___.app/___PROJECTNAME___

ld: library not found for -lSDL2
clang: error: linker command failed with exit code 1 (use -v to see invocation)

按照他的指示，我复制了项目模板并添加了 libSDL2.a 我在 Build Phases -> link binary with libraries 菜单下构建的库：

关于如何调试这个问题有什么建议吗？

编辑：我在使用库的项目中的构建目标配置：

Answer 1

您构建的静态库可能不包含您构建应用程序所针对的体系结构。您需要构建一个静态库，其中包含您要构建的平台的体系结构。

此外，请记住，实际上不支持为不同平台（例如 iOS 和 tvOS，甚至 iOS 和 iOS 模拟器放置架构——模拟器是单独的平台）在一个二进制文件中。您将需要针对每个目标平台的单独库或框架，尽管每个平台当然都可以包含该平台支持的所有架构的切片。

Answer 2

尝试使用此脚本构建您的库。最终产品将放在您的主目录 ~/SDL 目录中。

#!/bin/sh

PREFIX=$HOME/SDL
SYMROOT="SYMROOT=$PREFIX/release"

SDK_DEVICE="-sdk iphoneos"
SDK_SIMULATOR="-sdk iphonesimulator"
CONF_DEBUG="-configuration Debug"
CONF_RELEASE="-configuration Release"

mkdir -p $PREFIX
cd $PREFIX

wget https://www.libsdl.org/release/SDL2-2.0.4.zip
unzip SDL2-2.0.4.zip
rm -f SDL2-2.0.4.zip

# ------------------------------------------------------------------------
# SDL
# ------------------------------------------------------------------------
cd $PREFIX/SDL2-2.0.4/Xcode-iOS/SDL
SCHEME="libSDL"
PROJ="-project SDL.xcodeproj"

#xcodebuild OTHER_CFLAGS="-fembed-bitcode" OTHER_LDFLAGS="-lobjc"   ONLY_ACTIVE_ARCH=NO -arch i386 -arch x86_64 $PROJ $SDK_SIMULATOR      $CONF_DEBUG   -scheme='$SCHEME' build      $SYMROOT
xcodebuild OTHER_CFLAGS="-fembed-bitcode"  ONLY_ACTIVE_ARCH=NO -arch i386 -arch x86_64 $PROJ $SDK_SIMULATOR  $CONF_RELEASE -scheme='$SCHEME' build      $SYMROOT
#xcodebuild OTHER_CFLAGS="-fembed-bitcode" OTHER_LDFLAGS="-lobjc" ONLY_ACTIVE_ARCH=NO -arch arm64 -arch armv7 $PROJ $SDK_DEVICE      $CONF_DEBUG   -scheme='$SCHEME' build      $SYMROOT
xcodebuild OTHER_CFLAGS="-fembed-bitcode"  ONLY_ACTIVE_ARCH=NO -arch arm64 -arch armv7 $PROJ $SDK_DEVICE     $CONF_RELEASE -scheme='$SCHEME' build      $SYMROOT

lipo $PREFIX/release/Release-iphonesimulator/libSDL2.a $PREFIX/release/Release-iphoneos/libSDL2.a -create -output $PREFIX/libSDL2.a

使用 Xcode 调试链接器错误 - sdl 静态库

Debugging linker error with Xcode - sdl static library

xcode

sdl