#include <stdio.h> #include <dirent.h> #include <string.h> int main(void) { int i=0,yr[2],mth[2],dy[2],hr[2],min[2]; unsigned long len; float sec[2]; fpos_t pos; DIR *folder; FILE* file, *pfile; char filename[256],line[256]={'\0'},end[256],...

I was compiling the final gcc-9.2.0 build while following this article with make && make install when I came across the following error messages: In file included from ../../../../libsanitizer/sanitizer_common/sanitizer _platform_limits_posix.cc:193: ../.....

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我们的内部程序是用C编写的，在很多方面都广泛使用snprintf（），我注意到在进行perf记录/报告调试期间，它在以下方面花费了大量时间： │ _IO_vfprintf_internal(): ...

I am trying to use core-coupled memory (CCMRAM) of my cortex-m4 (STM32F407). It works fine with Keil MDK-ARM but gcc-arm-none-eabi ignores __attribute__((section("CCMRAM"))). #define configTOTAL_HEAP_SIZE 1000*1024 #define region1_HEAP_SIZE (40*1024) #...

考虑以下代码： #include <iostream> #include <functional> std::function<void ()> f() { int x = 666; return [&] { std::cout << x << std::endl; }; } int main() { f()(); return 0; } 在Ubuntu 18.04 bionic（WSL）上使用GCC 7.5.0进行编译： 没有优化 $ g++ -o main -std...

When ARM gcc 9.2.1 is given command line options -O3 -xc++ -mcpu=cortex-m0 [compile as C++] and the following code: unsigned short adjust(unsigned short *p) { unsigned short temp = *p; temp -= temp>>15; return temp; } 它产生合理的机器代码： ldrh r...

使用dpdk时，标题有一个奇怪的问题， 当我使用rte_pktmbuf_alloc（struct rte_mempool *）并已经验证rte_pktmbuf_pool_create（）的返回值不为NULL时，该进程接收到分段错误。 跟随 ing message is output of gdb in dpdk source code: Thread 1 "osw" received signal SIGSEGV, Segmentation fault. 0x00000000005e9f41 in __...

I have a template class called Basis, instantiated like this: Basis<std::function<sla::col<3>(const sla::col<2>&)>> basis; 并定义如下： template<typename V> struct Basis { std::vector<V> vectors; Basis() {} explicit Basis(std::vector<V>&& vect...

我可以在不添加文件的情​​况下很好地进行调试，但是，我不知道如何在添加文件后对其进行处理。 命令如下： g ++ -g --std = c ++ 11 lab1.cpp -o lab1 ./lab1 ./tests/extracredit-test-0.txt The following are my task.json and launch.json. I wonder how to modify it to support debugging with the file added. launch.j...

This question already has answers here: Should we generally use float literals for floats instead of the simpler double literals? ...

My server has GCC4 and I need newer version, so I built GCC7.3.0 and added the path to the $PATH variable. After this, gcc -v and g++ -v points to the correct version: Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/users/home/m/GCC-7.3.0/bin/.....

我正在尝试将这些递归函数与openMP任务并行化， 当我用gcc编译时，它只能在1个线程上运行。当我用clang编译时，它可以在多个线程上运行 void excalibur(unsigned long long int neuron,float pd_chain,unsigned long long int tstep){ for(unsigned long long int x = 0; x < W1i[neuron].size();x++){ pp1[neuro...

当我执行pip3 install imread时，出现以下错误： Collecting imread Using cached imread-0.7.4.tar.gz (151 kB) Requirement already satisfied: numpy in ./Library/Python/3.7/lib/python/site-packages (from imread) (1.17.4) Building wheels for collected packages: imread Bui...

我最近在一个用GCC 8编译的软件中研究了段错误。代码如下所示（这只是一个草图） struct Point { int64_t x, y; }; struct Edge { // some other fields // ... Point p; // <- at offset `0xC0` Edge(const Point &p) p(p) {} }; Edge *create_edge(const Point &p) { void raw_memory = my_custo...

这是我的Makefile： CC = gcc SRC = $(wildcard src/*.c) \ $(wildcard src/utils/*.c) obj = $(SRC:.c=.o) LDFLAGS = output: $(obj) $(CC) $^ -o $@ $(LDFLAGS) $(obj): $(SRC) $(CC) $^ -o $@ $(LDFLAGS) .PHONY: clean clean: rm -f $(o...

我正在尝试使用make来构建静态库。如果从虚拟机（在VirtualBox上使用CentOS 7）或在我们公司的一台Linux服务器上运行此操作，则该操作成功，但是从运行Ubuntu的Windows Subsystem Linux Bash shell运行该程序时，出现以下错误： /usr/include/stdio.h:276:43: error: missing binary operator before token "(" #if defined __USE_XOPEN2K8 || __GL...

我认为代码可以说明一切： ➜ project cat branch_prediction_victim.cpp #include <algorithm> #include <ctime> #include <iostream> int main(int argc, char* argv[]) { const size_t array_length = 32768; int array_aka[array_length]; std::srand(std::time(nullptr...

我为C ++中的运算符重载制作了以下最小示例。我想按如下所示打印矢量。 #include <iostream> #include <vector> using namespace std; ostream& operator<< (ostream& out, const vector<int>& v) { for(size_t i = 0; i < v.size(); i++) { out << v[i] << " "; } ...

When I compile this snippet (with -Ofast -fnest-loop-optimize) gcc generates assembly which traverses the array in source order. However if I uncomment the line // n = 32767 and assign any number to n, it interchanges the index order to x[i * n + j]. Trav...