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Questions tagged [gcc5]

Version 5.x of GCC (GNU Compiler Collection).

76 questions
115
votes
5 answers

How to Install gcc 5.3 with yum on CentOS 7.2?

I am using CentOS 7.2 When I use yum groupinstall "Development Tools", gcc version is 4.8.5, like this: I would like to install gcc 5.3 How to approach this with yum?
sunshine
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2 answers

Valgrind Unrecognised instruction

I have the following code: #include #include int main() { std::mt19937_64 rng(std::random_device{}()); std::cout << std::uniform_int_distribution<>(0, 100)(rng) << '\n'; } I try to profile it using valgrind, but it…
nwp
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2 answers

The program runs 3 times slower when compiled with g++ 5.3.1 than the same program compiled with g++ 4.8.4, the same command

Recently, I've started to use Ubuntu 16.04 with g++ 5.3.1 and checked that my program runs 3 times slower. Before that I've used Ubuntu 14.04, g++ 4.8.4. I built it with the same commands: CFLAGS = -std=c++11 -Wall -O3. My program contains cycles,…
Alex Novikov
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15
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1 answer

New option in GCC 5.3: -fno-semantic-interposition

GCC 5.3 has added a new option: -fno-semantic-interposition A new -fno-semantic-interposition option can be used to improve code quality of shared libraries where interposition of exported symbols is not allowed. This sounds like this is…
DevShark
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12
votes
1 answer

Is my fma() broken?

In using double fma(double x, double y, double z); I'd expect a non-zero d in the output lines below marked with '?'. It appears to internally only use long double precision rather than infinite precision as specified. The fma functions compute (x…
chux - Reinstate Monica
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12
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2 answers

Is C++17 std::shared_mutex not available yet?

Looking at C++ compiler support, it appears that the untimed version of std::shared_mutex is available in GCC 5.0+. However, even with gcc version 5.3.0 20151204 (Ubuntu 5.3.0-3ubuntu1~14.04), and compiling with -std=c++1z, a simple initialization…
alextoind
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11
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1 answer

Output data type of sizeof() operator

I am using Ubuntu 16.04.5 and GCC version 5.4.0. I was playing with sizeof() operator, wrote the code below: #include int main(int argc, char *argv[]){ long int mylint = 31331313131.1313; printf("size of long int is…
Adhamzhon Shukurov
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9
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3 answers

uint8_t not rollover to 0 after reaching 255 not working properly

I am new to the C-Headers - stdint.h and inttypes.h. I was trying out some code to get an inkling of how uint8_t works. But, it seems to have encountered a problem. I have declared 4 uint8_t integers with the boundary values 0, 255, 256, -1…
TejasKhajanchee
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9
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1 answer

How to install GCC 5.1 on Linux (Ubuntu)

I'd like to experiment with the new GCC 5.1 C++ compiler on Ubuntu. How can I install GCC 5.1 on Ubuntu? I'd prefer some form of pre-built executable that I could just download and install, instead of downloading GCC's sources and building the whole…
MikePro
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8
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1 answer

Build Proxygen under Ubuntu 16.04

I would like to build Facebook's Proxygen c++ http libraries out of github with Ubuntu 16.04. Here's the environment I set up along with the deps.sh command to install dependencies: gcc --version gcc (Ubuntu 5.4.0-6ubuntu1~16.04.1) 5.4.0…
moodboom
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8
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0 answers

Undefined reference in clang when linking to a library compiled with GCC5

I try to use the ubuntu 15.10 repository version of libmuparser (package libmuparser2v5). Compiling with gcc works fine, but not with clang. I dug deeper into this to come up with the following minimal (not) working example and a few…
John
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8
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1 answer

Can't compile C++11 source using GCC 5.1 toolchain

I'm trying to compile a library written with C++11 features using GCC 5.1 on Ubuntu. However, it complains std::unique_ptr is not defined. gcc (Ubuntu 5.1.0-0ubuntu11~14.04.1) 5.1.0 g++ (Ubuntu 5.1.0-0ubuntu11~14.04.1) 5.1.0 CXX flags: -std=c++11…
Thijs
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7
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1 answer

std::string class inheritance and tedious c++ overload resolution

I need to extend std::basic_string to work over path strings and different operator+: #include template class path_basic_string : public std::basic_string { public: …
Andry
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7
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1 answer

Why does g++5 deduces object instead of initializer_list in auto type deduction

I recently came upon this code: struct Foo{}; int main() { Foo a; // clang++ deduces std::initializer_list // g++5.1 deduces Foo auto b{a}; a = b; } It compiles fine with g++5.1, but fails in clang++ (used both -std=c++11 and…
vsoftco
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6
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1 answer

Invoking constructors during virtual inheritance with C++

This is a question I encountered while reading this section on learncpp.com. I used the code listed here, then made slight alterations for testing. Background Virtual inheritance creates a common reference to the base class, which has two…
Ryan B
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