How to compile PicoTCP minimal example on Windows
I was trying use picoTCP on Windows. I was following the how to compile on Windows from here. This compiled the library successfully with only notes of usleep being deprecated. The next step was to use...
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Install gcc offline Ubuntu
I got an offline Ubuntu 20.04. I wanted to use curl, but it wasn't installed. Trying to install it, needs binutils; tried to install binutils, needs make, tried to install make, needs...gcc!I seriously...
View Articlegcc-11 compiler giving error though it is already installed [closed]
I tried to compile yo.cpp file from terminal but it is giving this error on my macbook monterey air intel. I have already installed gcc-11. The file is compiling when Iuse clang compiler.Undefined...
View ArticleWhy strrev() in C is not working with char*?
Using C programming, with GCC in windows (with CodeBlocks)Why this code doesn't work (running it gives empty console window)# include <stdio.h># include <string.h>int main(){ char* str =...
View ArticleHow can I determine what architectures gcc supports?
GCC supports a -march switch that allows you to specify the architecture you are targeting - allowing it to tune instruction sequences for that platform as well as using instructions that might be...
View Articlearm-none-eabi toolchain compile from source
For my current project we are having an issue which we can solve if we are able to recompile the arm toolchain (gcc, c++stdlib, nanolibc, etc) from source.From the arm website I can download a snapshot...
View ArticleR3 register of ARM-Cortex M4F suddenly changes value right after ldr instruction
I have this really strange bug where an ldr instruction first loads in a valid value into the R3 register, then when I use the debugger to step over one instruction, it all of a sudden contains the...
View ArticleHow to write math library in C on ubuntu in VS code studio [closed]
I am just learning C and get an error. After searching on Google, I find out math.h does not work on Ubuntu using VScode. How can I see the result of math.h?
View ArticleHow to fix error or warning in C: "implicit declaration of function...
I am unable to use inet_aton() to convert an ASCII IP address such as "192.168.0.1" to a struct in_addr address in network byte order because I cannot get my code to compile.I'm working in this file:...
View ArticleDoes GCC optimize assembly source file?
I can use GCC to convert assembly code files into reallocatable files.gcc -c source.S -o object.o -O2Is the optimization option effective? Can I expect GCC to optimize my assembly code?
View Articlemultiple definition of `std::__detail::__clp2(unsigned int)', gcc-linaro
I am using gcc-linaro-12.0.1-2022.02-x86_64_arm-linux-gnueabihf arm toolchain.I could not figure out why I am getting multiple definition of standard __clp2 function. I have checked include guards in...
View ArticleWhy the syntax of linking symbols is error
I used arm-none-eabi-ld (GNU ld (2.34-4ubuntu1+13ubuntu1) 2.34) with --just-symbols=symbolfile which includes following symbols.a =0x00000050;b =0x00000054;c =0x00000058;d =0x00001000;e =0x00001004;f...
View ArticleWhy is this code using strlen heavily 6.5x slower with GCC optimizations...
I wanted to benchmark glibc's strlen function for some reason and found out it apparently performs much slower with optimizations enabled in GCC and I have no idea why.Here's my code:#include...
View ArticleHow do I temporarily disable a macro expansion in C/C++?
For some reason I need to temporarily disable some macros in a header file and the #undef MACRONAME will make the code compile but it will undef the existing macro.Is there a way of just disabling it?...
View ArticleGcc -g What happens？
The assembly file is obtained by using gcc -g -S, and the part of .s file is as follows：.L3: .loc 1 22 11 mov eax, DWORD PTR -12[rbp] mov edx, eax mov rcx, QWORD PTR .refptr._ZSt4cout[rip] call...
View ArticleInstalling g++ = 7.5.0 with support for Cilk Plus
I want to use https://github.com/yushangdi/parChain however I can't fullfil requirement:Compiler:g++ = 7.5.0 with support for Cilk PlusI have a problem with installing GCC with Cilk. I try to follow...
View ArticleWhy `memmove` function has significant difference in two different computers?
I've tried to run the following C code from two different computers.#include <string.h>int a[100000];int main(){ for(int sz = 100000; sz > 1; sz --){ memmove(a, a+1, 4*(sz - 1)); }}Computer A...
View ArticleSOLVED - boost::adaptor::filter segfault with compiler optimisations
I have some weird behaviours when using boost::adaptors::filter. Let's note that I created a small example that respects my larger project contraints. With the following short example I have a segfault...
View ArticleUsing clang-11 to cross compile for aarch64-linux-gnu on x86-64 error:...
I am trying to use clang-11 to cross compile a c++ file to aarch-linux-gnu, from my host machine which is x86-64.Here's the command :clang-11 -v -target aarch64-linux-gnu -B/usr/aarch64-linux-gnu/lib...
View ArticleLinux-ftrace: why code profiling is achieved through mcount function (gcc...
With this question I aim to do a survey about instrumentation techniques used by linux ftrace.According with ftrace.txt:If CONFIG_DYNAMIC_FTRACE is set, the system will run withvirtually no overhead...
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