relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol may bind externally can not be used 【ARM64平台编译】

报错：
/usr/bin/ld: ./obj/libtest.o: relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol _ZNSt8ios_base4InitD1Ev@@GLIBCXX_3.4 which may bind externally can not be used when making a shared object; recompile with -fPIC

/usr/bin/ld: ./obj/libtest.o(.text.startup+0x34): unresolvable R_AARCH64_ADR_PREL_PG_HI21 relocation against symbol _ZNSt8ios_base4InitD1Ev@@GLIBCXX_3.4

make -f LibMakefile_aarch64
make[1]: 进入目录“/home/huanghe/Desktop/WSDK_Linux/samples”
g++ -std=c++11 -c  -I../include  ./src/libtest.cpp  -Os -D_FX_OS_=_FX_LINUX_DESKTOP_
./src/libtest.cpp: In function ‘int scan_image()’:
./src/libtest.cpp:177:43: warning: ISO C++ forbids converting a string constant to ‘GCH_LPSTR’ {aka ‘char*’} -Wwrite-strings]char *devlist = gch_GetDevicesList(";"); //返回 型号1；型号2； 需要自行分隔^
./src/libtest.cpp:315:1: warning: control reaches end of non-void function [-Wreturn-type]}^
g++ -fPIC -shared -o .//libtest.so ./obj/*.o  -L../lib/aarch64  -Xlinker "-(" -Wl,-rpath=../lib/aarch64/ -lScanImagesdk[aarch64] -Xlinker "-)" -lz -ldl # -fopenmp -lfontconfig
/usr/bin/ld: ./obj/libtest.o: relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol `_ZNSt8ios_base4InitD1Ev@@GLIBCXX_3.4' which may bind externally can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: ./obj/libtest.o(.text.startup+0x34): unresolvable R_AARCH64_ADR_PREL_PG_HI21 relocation against symbol `_ZNSt8ios_base4InitD1Ev@@GLIBCXX_3.4'
/usr/bin/ld: 最后的链结失败: bad value
collect2: error: ld returned 1 exit status
make[1]: *** [LibMakefile_aarch64:42：all] 错误 1
make[1]: 离开目录“/home/huanghe/Desktop/WSDK_Linux/samples”
make: *** [Makefile:20：default] 错误 2

解决:

加上-mcmodel=large编译选项
-mcmodel=large 使可执行文件使用64位绝对地址访问数据段，这会减慢内核速度并使其更大。
加上 -O2

#Winmage WSDK project DEMO for aarch64 CPU
## Tools.
CC          =  gcc
LD          =  gcc
RM          =  -/bin/rm -f#
# Parameters for tools.
REL_FLAGS   =  -Os -D_FX_OS_=_FX_LINUX_DESKTOP_# Parameters for the current project.
SRC_DIR     =  ./srcSOURCES         =       $(SRC_DIR)/libtest.cpp $(SRC_DIR)/json.hppOBJ_DIR     =  ./obj
REL_BIN_DIR =  ./
LIB_DIR     =  ../lib/aarch64
INC_DIRS    =       -I../include #-I/usr/local/Trolltech/Qt-4.8.7/includeREL_DIRS  =  -L$(LIB_DIR)REL_LIBS    =   -Xlinker "-(" -Wl,-rpath=../lib/aarch64/ -lScanImagesdk[aarch64] -Xlinker "-)"REL_OBJ_DIR =  $(OBJ_DIR)REL_BIN         =    libtest.so#
all: $(SOURCES)$(CC) -O2 -mcmodel=large -c $(CFLAGS) $(INC_DIRS) $(SOURCES)  $(REL_FLAGS)@-mkdir -p $(REL_OBJ_DIR)@mv *.o $(REL_OBJ_DIR)@-mkdir -p $(REL_BIN_DIR)$(LD) -O2 -mcmodel=large -fPIC -shared -o $(REL_BIN_DIR)/$(REL_BIN) $(REL_OBJ_DIR)/*.o  $(REL_DIRS)  $(REL_LIBS) -lz -ldl # -fopenmp -lfontconfig #clean:$(RM) $(REL_BIN_DIR)/$(REL_BIN) $(REL_OBJ_DIR)/*.o  *.o

参考：
http://ilinuxkernel.com/?p=1738
https://www.itdaan.com/blog/2017/11/28/fae8cf800fd5f697387fe6889fd93e42.html

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relocation R_AARCH64_ADR_PREL_PG_HI21 against symbol may bind externally can not be used 【ARM64平台编译】

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