nm

问题 I am trying to build libcurl with static linking to openssl. So to achieve that, I have used following configuration: OpenSSL: LDFLAGS="-static” LIBS="-ldl” cURL: LDFLAGS="-static” CPPFLAGS="-I$(CURDIR)/$(3RDPARTY_DIR)$(OPENSSL)/include LDFLAGS="-L$(CURDIR)/$(3RDPARTY_DIR)$(OPENSSL)" ./configure --disable-shared --without-zlib --without-libidn --without-librtmp --disable-ldap —-with-ssl=<path where my openssl is installed> With this, I am to generate libcurl.a and link it to my code where I

问题 I'm using some LLVM tools (like llvm-nm ) as static libraries. I.e. i copied source llvm-nm.cpp, renamed main(..) to llvm_nm(..) and compiled it as static library. I'd like to forward standard output to my file. I've tried to use the next approach: int out_fd, err_fd; fpos_t out_pos, err_pos; // redirect out fflush(stdout); fgetpos(stdout, &out_pos); out_fd = dup(fileno(stdout)); freopen(outFilename, "w", stdout); // execute int ret = llvm_nm(argc_, argv_); // restore output fflush(stdout);

问题 I'd like to provide a library that provides template code. But I would also like to keep the most possible the ownership of this code (generated code) when I can guess the usage of different usual types of my template. Here is an example of what I am trying to do: lib1.h #include <iostream> template<int N> void print_me() { std::cout << "I am function number " << N << std::endl; } lib1.cpp #include "lib1.h" /* Force symbols to be defined here. */ template void print_me<0>(); template void

问题 While I was trying to resolve a problem in static linking, I encounter a couple of _GLOBAL__sub_I_ prefixes in front of symbol names. It appears in that form although I used nm --demangle(-C) . I stumbled upon this answer (How to find global static initializations). Looking at my source code, it indeed looks like initialization of a global static variable. What I'm wondering is, where can I more information on __sub_ and other mangled names, like __cxxabiv1 ? 回答1: To prevent link rot i will

问题 I build my program like this: g++ -std=c++11 myprog.cpp -o myprog -lqpid-proton-cpp Then I run ./myprog and get this error: symbol lookup error: ./myprog: undefined symbol: _ZN6proton10event_loop6injectESt8functionIFvvEE Yet, nm reports the symbol is present in the library . . . nm -D /usr/lib/libqpid-proton-cpp.so | grep _ZN6proton10event_loop6injectESt8functionIFvvEE . . . yields: 000000000002f460 T _ZN6proton10event_loop6injectESt8functionIFvvEE What am I missing here? 回答1: Did you verify,

问题 I am having an undefined symbol error at runtime, and when I look for the symbol in the relevant library, I get the result: nm -C -D /home/farmer/anaconda3/envs/general/lib/python3.6/site-packages/pyscannerbit/libScannerBitCAPI.so | grep empty_ U YAML::detail::node_data::empty_scalar[abi:cxx11] 00000000002b5860 T YAML::detail::node_data::empty_scalar[abi:cxx11]() But how is that possible? The symbol is both undefined, and also in the library? What? Or are these actually different symbols?

问题 I'm having some problems with my iPhone app not linking for the iPhone Simulator. It tells me there are undefined symbols: Undefined symbols for architecture i386: ".objc_class_name_NSRunLoop", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o ".objc_class_name_NSDate", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o ".objc_class_name_NSAutoreleasePool", referenced from: pointer-to-literal-objc-class-name in SampleBrowser.cpp.o pointer-to

问题 I am reading the book Hacking, the art of exploitation. In the book there is a section that explain the use of .dtors and .ctors . I'm trying to reproduce one of the exercises of the book but in my executable I do not have this sections. At first I thought the problem was that I was compiling for 64-bit, but now I'm compiling for 32-bit and .dtors and .ctors are still not appearing in the section table. Here is the code: #include <stdio.h> #include <stdlib.h> static void miConstructor(void) _

问题 #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/mman.h> #include <errno.h> #include <fcntl.h> #include <elf.h> Elf64_Rela *retab; Elf64_Rela *retab_end; Elf64_Ehdr *ehdr; Elf64_Shdr *shdr; char *strtab; void elf_open(char *filename) { int fd = open(filename, O_RDONLY); struct stat sbuf; fstat(fd, &sbuf); void *maddr = mmap(NULL, sbuf.st_size, PROT_READ, MAP_SHARED, fd, 0); close(fd); ehdr = maddr; shdr =

问题 Just to give you some context, here's what I'm trying to achieve: I am embedding a const char* in a shared object file in order to have a version string in the .so file itself. I am doing data analysis and this string enables me to let the data know which version of the software produced it. This all works fine. The issue I am having is when I try to read the string out of the .so library directly. I tried to use nm libSMPselection.so | grep _version_info and get 000000000003d968 D _