linker

问题 I am trying to create an user defined block in INSEL which requires C++ to program and I link it using gfortran. I have the following code in my program // Setting seed for random number generators unsigned seed = static_cast<int> (std::chrono::system_clock::now().time_since_epoch().count()); to set as a seed to my random number generator. When i compile it using g++ (gcc v.5.1.0) it shows no error or warning. My compiling command is g++ -O0 -Wall -c -g3 -std=c++14 -fmessage-length=0 $

问题 I need to include a header file that contains some global variables (not mine so I cannot change it). How do I do this so that the variables within the included file are considered 'extern' in all but one case? 回答1: You cannot. Copy the header and add extern yourself. 回答2: If the variables are only declared in the header, but aren't assigned a value, then you might be able to do this, depending on the compiler. GCC, for example, has the -fno-common flag to control this behavior. 来源： https:/

问题 I have this: a.cpp int localfunction () { return 1; } int local_symbol = localfunction(); b.cpp void thirdfunction () {}; main.cpp void main () { thirdfunction (); } When I compile this in a main executable everything works (even with optimizations), and the localfunction is executed at startup even if I don't call it directly. Now, in Visual C++ and GCC , I put a.cpp and b.cpp in a static library (.lib). localfunction is no more executed/defined. From what I understand the symbol is detected

问题 I'm working on an application where there's a 'core' and multiple plugins. I'm using Qt on Linux, and I use Qt's plugin loader system. Plugins are created as shared object files (*.so) and loaded dynamically. If I link to a library with a plugin, and that library links to additional libraries, I often get an 'undefined symbol' error from the application. To get around it, I need to link the plugin to the additional libraries as well... Plugin links to LibA LibA links to LibB, LibC LibA is

问题 I'm trying to compile the following code by Joe Stam (convolutionapproaches, project with vs2005, I am using VS2010 but compiling with 9.0 engine) 1>ConvolutionCudaFunctions.obj : error LNK2019: unresolved external symbol _cudaEventDestroy@4 referenced in function "float _cdecl NaiveGlobalConvolution(unsigned char *,unsigned char *,unsigned int,unsigned int,unsigned int,int,int)" (?NaiveGlobalConvolution@@YAMPAE0IIIHH@Z) 1>main.obj : error LNK2001: unresolved external symbol _cudaEventDestroy

问题 In my work, we have a variety of large tables storing data used for a set of multidimensional nonparametric models. Each table is a float array with a size of typically 200,000 to 5,000,000 elements. Today, I was going about a normally trivial update to this codebase, updating a set of the lookup tables, when I found the compiling and linking of the project was resulting in a Microsoft Incremental Linker has Stopped Working , something I had not seen before. Note that the tables I was

问题 This question already has answers here : Trying to include a library, but keep getting 'undefined reference to' messages (3 answers) Closed 5 years ago . I am trying to include this file in my project: http://cairo.sourcearchive.com/documentation/1.9.4/backtrace-symbols_8c-source.html But it requires linking against BFD. I have both binutils and binutils-devel installed. I have tried linking with -lbfd as well as directly to /usr/lib64/libbfd.so and /usr/lib64/libbfd.a (which both do exist).

问题 // SomeCls.h class SomeCls { static const int PERIOD_ALARM_NORMAL = 5; static const int PERIOD_ALARM_THRESH = 1; void method() { bool b = true; const int d = b ? PERIOD_ALARM_THRESH : PERIOD_ALARM_NORMAL; } } obj; It is going to build ok. Now take out the method() implementation and place it in a cpp file: //SomeCls.cpp #include "SomeCls.h" void SomeCls::method() { bool b = true; const int d = b ? PERIOD_ALARM_THRESH : PERIOD_ALARM_NORMAL; } Why does mr. linker say undefined reference to

问题 I've seen this article and learned that: Directories specified on the command line with -L option are searched before the default directories. The directories specified in -L are searched in the order in which they are specified on the command line. The question is: Is there an search order for the default directories? For example, if I run this command: $ gcc -Xlinker --verbose 2>/dev/null | grep SEARCH | sed 's/SEARCH_DIR("=\?\([^"]\+\)"); */\1\n/g' | grep -vE '^$' (command copied from this

问题 I want to compile a program using makefile which is linked against the zlib shared libraries which it is different from the one installed on my system. But I don't want them to be permanently added to the library pool of my system. The path of custom zlib is /usr/work/libxlsxwriter-master/zlib-1.2.8 I have tried to use something like: ZLIBDIR=/usr/work/libxlsxwriter-master/zlib-1.2.8 # The static library. $(LIBXLSXWRITER_A) : $(OBJS) export LD_LIBRARY_PATH=$(ZLIBDIR):$(DEPENDENCIES); \ $(Q)$