linker

问题 Here is a very simple assembly program, just return 12 after executed. $ cat a.asm global _start section .text _start: mov rax, 60 ; system call for exit mov rdi, 12 ; exit code 12 syscall It can be built and executed correctly: $ nasm -f elf64 a.asm && ld a.o && ./a.out || echo $? 12 But the size of a.out is big, it is more than 4k: $ wc -c a.out 4664 a.out I try to understand it by reading elf content: $ readelf -l a.out Elf file type is EXEC (Executable file) Entry point 0x401000 There are

问题 I'm trying to understand the dynamic linking of shared libraries on Linux. Given the following dump of Relocation section '.rela.plt': Offset Info Type Sym. Value Sym. Name + Addend 000000373f68 0f8300000007 R_X86_64_JUMP_SLO 0000000000000000 _ZN8CashFlowmIERK7Paym + 0 000000373f70 0f9800000007 R_X86_64_JUMP_SLO 0000000000000000 _Z8printCapPK3CapP8_IO + 0 000000373f78 0f9900000007 R_X86_64_JUMP_SLO 0000000000000000 _ZN13SharedBaggage16ge + 0 000000373f80 0f9c00000007 R_X86_64_JUMP_SLO

问题 Im trying to link a few files in c and im getting this erorr: "multiple definition of createStudentList" my main.c: #include "students.h" int main(void) { return 0; } students.h: #ifndef _students_h_ #define _students_h_ #include "students.c" bool createStudentList(); #endif students.c: #include <stdbool.h> typedef struct Students { int id; double average; } Student; bool createStudentList() { return true; } 回答1: Due to the includes, you have the function createStudentList() defined in both

问题 I created an app (api_tests) that uses a library (libstorage.so) that linked to oracle occi library (libocci.so.12.1) and compiled it. When I run this app, I get an error: api_tests api_tests: symbol lookup error: ./libstorage.so: undefined symbol: _ZN6oracle4occi11Environment17createEnvironmentENS1_4ModeEPvPFS3_S3_mEPFS3_S3_S3_mEPFvS3_S3_E However this library with this symbol exists in the current directory: ls | grep libocci libocci.so* libocci.so.11.1* libocci.so.12.1* nm libocci.so.12.1

问题 How do I determine whether a function exists within a library, or list out the functions in a compiled library? 回答1: You can use the nm command to list the symbols in static libraries. nm -g -C <libMylib.a> 回答2: For ELF binaries, you can use readelf: readelf -sW a.out | awk '$4 == "FUNC"' | c++filt -s : list symbols -W : don't cut too long names The awk command will then filter out all functions, and c++filt will unmangle them. That means it will convert them from an internal naming scheme so

问题 How do I determine whether a function exists within a library, or list out the functions in a compiled library? 回答1: You can use the nm command to list the symbols in static libraries. nm -g -C <libMylib.a> 回答2: For ELF binaries, you can use readelf: readelf -sW a.out | awk '$4 == "FUNC"' | c++filt -s : list symbols -W : don't cut too long names The awk command will then filter out all functions, and c++filt will unmangle them. That means it will convert them from an internal naming scheme so

问题 How do I determine whether a function exists within a library, or list out the functions in a compiled library? 回答1: You can use the nm command to list the symbols in static libraries. nm -g -C <libMylib.a> 回答2: For ELF binaries, you can use readelf: readelf -sW a.out | awk '$4 == "FUNC"' | c++filt -s : list symbols -W : don't cut too long names The awk command will then filter out all functions, and c++filt will unmangle them. That means it will convert them from an internal naming scheme so

问题 Have a library os.lib which has many objects archived like kernel.o semaphor.o..etc need to place the specific section of object file in os.lib to a flash location using gcc linker script SECTIONS { .text : { os.lib:kernel.o(.text) } } But does not seem to work! ld throws error kernel.o not found. tried this and also archive:file mentioned in this does not work tool chain: arm-none-eabi-ld 来源： https://stackoverflow.com/questions/65092280/gcc-linking-specific-file-in-archive

问题 I have already figure out how to staticly link v8 with my own GLIBC/STDC++. $(GCC_ROOT)/bin/g++ samples/bench.cpp -o bench -isystem$(GLIBC_ROOT)/include/ -I. -Iinclude -isystem$(GLIBC) -nodefaultlibs -DV8_COMPRESS_POINTERS -static $(V8_OBJ)/libv8_monolith.a -Wl,--start-group $(GCC_ROOT)/lib64/libstdc++.a $(GLIBC_ROOT)/lib/libpthread.a $(GLIBC_ROOT)/lib/libdl.a $(GLIBC_ROOT)/lib/libm.a $(GLIBC_ROOT)/lib/librt.a $(GCC_GCC)/libgcc.a $(GCC_GCC)/libgcc_eh.a $(GCC_GCC)/libcommon.a $(GLIBC_ROOT)/lib

问题 I have already figure out how to staticly link v8 with my own GLIBC/STDC++. $(GCC_ROOT)/bin/g++ samples/bench.cpp -o bench -isystem$(GLIBC_ROOT)/include/ -I. -Iinclude -isystem$(GLIBC) -nodefaultlibs -DV8_COMPRESS_POINTERS -static $(V8_OBJ)/libv8_monolith.a -Wl,--start-group $(GCC_ROOT)/lib64/libstdc++.a $(GLIBC_ROOT)/lib/libpthread.a $(GLIBC_ROOT)/lib/libdl.a $(GLIBC_ROOT)/lib/libm.a $(GLIBC_ROOT)/lib/librt.a $(GCC_GCC)/libgcc.a $(GCC_GCC)/libgcc_eh.a $(GCC_GCC)/libcommon.a $(GLIBC_ROOT)/lib