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我最近決定嘗試在iOS設備上運行一些圖形代碼，但我使用FreeImage來加載紋理。因此我需要爲iOS 5.0構建它。編譯/鏈接FreeImage for iOS 5.0
當我嘗試使用FreeImage庫時，我正在收到鏈接錯誤。鏈接錯誤都是標準C++庫相關的。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，建築的FreeImage爲iOS提供的makefile文件是有點過時了，所以我被迫更新。此外，在我的XCode項目中，我將編譯器切換爲支持C++ 11功能並使用libC++（如此處所述Can I use C++11 with Xcode?）
所以我試圖在FreeImage的makefile中對這些更改進行鏡像，但我仍然收到這些錯誤。
我的makefile文件看起來像這樣（我發現這個職位有點用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 [email protected] $(MODULES_i386)
.c.o-i386:
$(CC_SIM) $(CFLAGS_SIM) -c $< -o [email protected]
.cpp.o-i386:
$(CXX_SIM) $(CXXFLAGS_SIM) -c $< -o [email protected]
$(STATICLIB_PHONE): $(MODULES_ARM)
$(LIBTOOL_PHONE) -arch_only $(ARCH_PHONE) -o [email protected] $(MODULES_ARM)
.c.o-arm:
$(CC_PHONE) $(CFLAGS_PHONE) -c $< -o [email protected]
.cpp.o-arm:
$(CXX_PHONE) $(CXXFLAGS_PHONE) -c $< -o [email protected]
clean:
rm -f core Dist/*.* u2dtmp* $(MODULES_i386) $(MODULES_ARM) $(STATICLIB_SIM) $(STATICLIB_PHONE)
也許有人能指出我要去哪裏錯了
編輯： 我固定一個問題，即它是不重建希望成爲解決方案的i386目標文件，但它仍然具有相同的鏈接錯誤。
編輯： 我調整好自己的Makefile使用鐺++
我還添加了的libC++到鏈接的框架
這裏是關於C++
我的XCode項目設置
我也有.cpp文件在我的XCode項目中。然而，錯誤仍然存在。
EDIT3：
結果請查詢：
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()
完整鏈接錯誤輸出可以在這裏找到：http://pastebin.com/wjbWgE4S
兩個庫和二進制編譯正在使用相同版本的libC++編譯（即要麼的libC++或stdlibC++，但不是混合） - 這可能會導致鏈接錯誤。另外，如果你只用clang進行編譯，那麼默認情況下它不會鏈接到C++庫中。鏗鏘++將鏈接在C++庫中默認。這是一個典型的c/C++編譯gotcha – Petesh
不要忘記明確地將libC++/libstdC++添加到框架/庫來鏈接。默認情況下，它們在Objective-C項目中沒有鏈接 – Petesh
所有我不知道的東西，謝謝你的幫助。 – Tocs