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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...

经过数小时的调试后，我希望能在StackOverflow上找到一些帮助。 我目前正在接受PTP培训，由于我只使用Linux，因此我也想在本地计算机上练习第一个Labs。 我要做的是通过缓冲区溢出利用一个非常简单的程序。只是给出了来源： goodpwd.cpp： #include <iostream> #include <cstring> int bf_overflow(char *str){ char buffer[10]; //our buffer strcp...

I've got some code that gcc (4.8.5, if it matters) compiles into nearly identical binary on two different machines except for one spot, where something in the toolchain on one machine decides to use a "near" JE instruction while the toolchain on the other ...