我最近决定尝试在 iOS 设备上运行我的一些图形代码，但我使用 FreeImage 来加载纹理。因此，我需要为 iOS 5.0 构建它。
我目前在尝试使用 FreeImage 库时遇到链接错误。链接错误都与标准 C++ 库相关。例如...
Undefined symbols for architecture i386:
"std::basic_string<char, std::char_traits<char>, std::allocator<char>>::~basic_string()", referenced from:
_FreeImage_GetMetadata in libfreeimage-iphonesimulator.a(BitmapAccess.o-i386)
_FreeImage_SetMetadata in libfreeimage-iphonesimulator.a(BitmapAccess.o-i386)
_FreeImage_CloneMetadata in libfreeimage-iphonesimulator.a(BitmapAccess.o-i386)
_FreeImage_Clone in libfreeimage-iphonesimulator.a(BitmapAccess.o-i386)
std::pair<std::string const, FITAG*>::~pair() in libfreeimage-iphonesimulator.a(BitmapAccess.o-i386)
Load(FreeImageIO*, void*, int, int, void*) in libfreeimage-iphonesimulator.a(PluginEXR.o-i386)
C_OStream::write(char const*, int) in libfreeimage-iphonesimulator.a(PluginEXR.o-i386)
...
不幸的是，为 iOS 构建 FreeImage 提供的 makefile 有点过时，所以我被迫更新它。此外，在我的 XCode 项目中，我切换了编译器以支持 C++11 功能并使用 libc++（如此处所述我可以将 C++11 与 Xcode 一起使用吗？）
所以我试图在 FreeImage 的 makefile 中镜像这些更改，但我仍然收到这些错误。
我的 makefile 看起来像这样（我发现这篇文章有些帮助http://sourceforge.net/p/freeimage/discussion/36110/thread/51445acc）
# Configuration for iPhone OS, making static libs
# this will generate both iPhone (arm) and iPhoneSimulator (i686) libs
include Makefile.srcs
CFLAGS = -g -O2 -Wall -Wmissing-prototypes -std=c99 -ffast-math -fno-strict-aliasing
CXXFLAGS = -g -O2 -Wall -fno-strict-aliasing -std=c++0x -stdlib=libc++
GCC_VERSION = 4.2
IPHONEOS_DEPLOYMENT_TARGET = 5.0
MACOSX_DEPLOYMENT_TARGET = 10.6
PLATFORM_SIM = iPhoneSimulator
PLATFORM_PHONE = iPhoneOS
ARCH_SIM = i386
ARCH_PHONE = armv7
PLATFORM_SIM_DEVELOPER_BIN_DIR = /Developer/Platforms/$(PLATFORM_SIM).platform/Developer/usr/bin
PLATFORM_PHONE_DEVELOPER_BIN_DIR = /Developer/Platforms/$(PLATFORM_PHONE).platform/Developer/usr/bin
SDKROOT_SIM = /Developer/Platforms/$(PLATFORM_SIM).platform/Developer/SDKs/$(PLATFORM_SIM)$(IPHONEOS_DEPLOYMENT_TARGET).sdk
SDKROOT_PHONE = /Developer/Platforms/$(PLATFORM_PHONE).platform/Developer/SDKs/$(PLATFORM_PHONE)$(IPHONEOS_DEPLOYMENT_TARGET).sdk
EXTRA_CFLAGS_SIM += -arch $(ARCH_SIM) -pipe -mdynamic-no-pic -fvisibility=hidden $(INCLUDE) -isysroot $(SDKROOT_SIM)
EXTRA_LDFLAGS_SIM += -arch $(ARCH_SIM) -isysroot $(SDKROOT_SIM) -Wl,-dead_strip
EXTRA_CFLAGS_SIM += -D__IPHONE_OS_VERSION_MIN_REQUIRED=20000 -mmacosx-version-min=$(MACOSX_DEPLOYMENT_TARGET)
EXTRA_LDFLAGS_SIM += -mmacosx-version-min=$(MACOSX_DEPLOYMENT_TARGET)
EXTRA_CFLAGS_PHONE += -arch $(ARCH_PHONE) -pipe -mdynamic-no-pic -fvisibility=hidden $(INCLUDE) -isysroot $(SDKROOT_PHONE)
EXTRA_LDFLAGS_PHONE += -arch $(ARCH_PHONE) -isysroot $(SDKROOT_PHONE) -Wl,-dead_strip
EXTRA_CFLAGS_PHONE += -miphoneos-version-min=$(IPHONEOS_DEPLOYMENT_TARGET)
EXTRA_LDFLAGS_PHONE += -miphoneos-version-min=$(IPHONEOS_DEPLOYMENT_TARGET)
AR_SIM = $(PLATFORM_SIM_DEVELOPER_BIN_DIR)/ar
AR_PHONE = $(PLATFORM_PHONE_DEVELOPER_BIN_DIR)/ar
CC_SIM = $(PLATFORM_SIM_DEVELOPER_BIN_DIR)/llvm-gcc-$(GCC_VERSION)
CC_PHONE = $(PLATFORM_PHONE_DEVELOPER_BIN_DIR)/llvm-gcc-$(GCC_VERSION)
CFLAGS_SIM = $(CFLAGS) $(EXTRA_CFLAGS_SIM)
LDFLAGS_SIM = $(EXTRA_LDFLAGS_SIM)
CXX_SIM = $(PLATFORM_SIM_DEVELOPER_BIN_DIR)/clang++
CXXFLAGS_SIM += $(EXTRA_CFLAGS_SIM) -fvisibility-inlines-hidden
LIBTOOL_SIM = /Developer/Platforms/$(PLATFORM_SIM).platform/Developer/usr/bin/libtool
CFLAGS_PHONE = $(CFLAGS) $(EXTRA_CFLAGS_PHONE)
LDFLAGS_PHONE += $(EXTRA_LDFLAGS_PHONE)
CXX_PHONE = $(PLATFORM_PHONE_DEVELOPER_BIN_DIR)/clang++
CXXFLAGS_PHONE += $(EXTRA_CFLAGS_PHONE) -fvisibility-inlines-hidden
LIBTOOL_PHONE = /Developer/Platforms/$(PLATFORM_PHONE).platform/Developer/usr/bin/libtool
TARGET = freeimage
STATICLIB_SIM = lib$(TARGET)-iphonesimulator.a
STATICLIB_PHONE = lib$(TARGET)-iphone.a
HEADER = Source/FreeImage.h
.SUFFIXES: .o-i386 .o-arm
MODULES_ARM = $(SRCS:.c=.o-arm)
MODULES_ARM := $(MODULES_ARM:.cpp=.o-arm)
MODULES_i386 = $(SRCS:.c=.o-i386)
MODULES_i386 := $(MODULES_i386:.cpp=.o-i386)
default: all
all: dist
dist: FreeImage
cp *.a Dist
cp Source/FreeImage.h Dist
FreeImage: $(STATICLIB_SIM) $(STATICLIB_PHONE)
$(STATICLIB_SIM): $(MODULES_i386)
$(LIBTOOL_SIM) -arch_only $(ARCH_SIM) -o $@ $(MODULES_i386)
.c.o-i386:
$(CC_SIM) $(CFLAGS_SIM) -c $< -o $@
.cpp.o-i386:
$(CXX_SIM) $(CXXFLAGS_SIM) -c $< -o $@
$(STATICLIB_PHONE): $(MODULES_ARM)
$(LIBTOOL_PHONE) -arch_only $(ARCH_PHONE) -o $@ $(MODULES_ARM)
.c.o-arm:
$(CC_PHONE) $(CFLAGS_PHONE) -c $< -o $@
.cpp.o-arm:
$(CXX_PHONE) $(CXXFLAGS_PHONE) -c $< -o $@
clean:
rm -f core Dist/*.* u2dtmp* $(MODULES_i386) $(MODULES_ARM) $(STATICLIB_SIM) $(STATICLIB_PHONE)
也许有人可以指出我哪里出错了
编辑：我修复了一个问题，它没有重建 i386 目标文件，希望这是解决方案，但是它仍然有相同的链接错误。
编辑：我调整了我的makefile以使用clang++
我还在链接的框架中添加了 libc++
这是我对 XCode 项目的 C++ 设置
我的 XCode 项目中也有 .cpp 文件。然而，错误仍然存在。
编辑3：
请求查询的结果：
nm libfreeimage-iphonesimulator.a | c++filt | grep '~basic_string()' | sort -u
nm: no name list
nm: no name list
U std::basic_string<char, std::char_traits<char>, std::allocator<char> >::~basic_string()
完整的链接器错误输出可以在这里找到：http: //pastebin.com/wjbWgE4S