std::packaged_task should have deleted copy c'tor with const parameter
Link https://cplusplus.github.io/LWG/issue2067 provides the following discussion:Class template packaged_task is a move-only type with the following form of the deleted copy operations:...
View Articlesetup script exited with error: command 'x86_64-linux-gnu-gcc' failed with...
When I try to install odoo-server, I got the following error: error: Setup script exited with error: command 'x86_64-linux-gnu-gcc' failed with exit status 1 Could anyone help me to solve this issue?
View ArticleWhy is %f working incorrectly for large double numbers in print statement?...
double a = 1E100 printf("%f", a); It seems to be printing a different value other than 1 followed by a 100...
View ArticleGCC: ld.exe cannot find file
I have a C++ project with external libraries, but I don't manage to make it work. When I try to specify a certain external library file, it seems that ld.exe cannot find it; I tried relative path,...
View Articlefatal error: limits.h: No such file or directory
On OSX, I can't compile simple programs from the command-line when I use an externally-provided compiler (e.g. gcc, or a custom clang install). System headers like limits.h cannot be found.Example...
View ArticleOptimization of copying with an explicit byte order in arm-none-eabi-gcc
In writing part of a deserializer for a data structure in C, I needed a way to read 16-bit and 32-bit integers. Given that there is a possibility that this code may be compiled for and used on an...
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Trying to skip vtable and inline call in a case where type is known
Update: This seems to be specific to gcc < 4.9, which improved devirtualization. On a polymorphic class hierarchy I have a non-virtual interface function (let's call her algorithm) that calls some...
View ArticleHow to specify -march=native using pragmas (or otherwise) in gcc
I would like to specify the compiler options for my C code that will be compiled in gcc. I need to do this from within the code because of the way the code will be deployed. This is the code currently...
View ArticleWhen is it necessary to use the flag -stdlib=libstdc++?
When is it necessary to use use the flag -stdlib=libstdc++ for the compiler and linker when compiling with gcc?Does the compiler automatically use libstdc++? I am using gcc4.8.2 on Ubuntu 13.10 and I...
View ArticleWhat's the difference among cflgs sse options of -msse, -msse2, -mssse3,...
For the GCC CFLAGS options: -msse, -msse2, -mssse3, -msse4, -msse4.1, -msse4.2. Are they exclusive in their use or can they be used together?My understanding is that the choosing which to set depends...
View ArticleRunning Boost library but getting clang error when using gcc on Mac
I am trying to run this example (from: https://theboostcpplibraries.com/boost.serialization-archive#ex.serialization_01):#include <boost/archive/text_oarchive.hpp> #include <iostream> using...
View Articleundefined reference to `_GLOBAL_OFFSET_TABLE_' in gcc 32-bit code for a...
I have a small c code file(function.c):int function() { return 0x1234abce; } I am using a 64 bit machine. However, I want to write a small 32 bit OS. I want to compile the code into a 'pure'...
View ArticleHow to assert if a std::mutex is locked?
With GCC 4.8.2 (on Linux/Debian/Sid 64 bits) -or GCC 4.9 when available - in C++11- I have some mutexstd::mutex gmtx; actually, it is a static member in some class Foo containing both alpha and beta...
View Articlegcc: error: unrecognized command line option...
During build of Firefox (older versions including 56.0, 57.0), I encountered the following error a lot of times:gcc: error: unrecognized command line option ‘-fsanitize-coverage=trace-pc-guard’; did...
View ArticleGCC: Should undefined behavior of overflows preserve logical consistency?
The following code produces strange things on my system:#include <stdio.h> void f (int x) { int y = x + x; int v = !y; if (x == (1 << 31)) printf ("y: %d, !y: %d\n", y, !y); } int main () {...
View ArticleGCC and installing C so I can run VSCode on my MacOS
I'm a very new programmer and I've been using VSCode for running HTML with no problem. However, I need to run C for my CS class but I get an error whenever I type "gcc". How can I solve this? How it looks
View Articleexplicit specialization of template class member function
I need to specialize template member function for some type (let's say double). It works fine while class X itself is not a template class, but when I make it template GCC starts giving compile-time...
View ArticleCompiler change msvc 2019 vs. 2017 and gcc (mingw32) and error C2039
This is a request for feedback from anyone who would like to respond. Otherwise, since I already have a fix, this request can be closed very fast. My question:Why does MSVC flag this as an error, while...
View ArticleSetting up Linux-C-DB2 environment
I'm trying to set up an environment for learning: writing and testing simple C programs to perform DB2 database operations on an Ubuntu 18.04. system.I installed DB2 with help of web tutorials and IBM...
View ArticleWhy does GCC aggregate initialization of an array fill the whole thing with...
Why does gcc fill the whole array with zeros instead of only the remaining 96 integers? The non-zero initializers are all at the start of the array.void *sink; void bar() { int a[100]{1,2,3,4}; sink =...
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