GCC 7 is a major release of the GNU Compiler collection first released in 2017.
Version 7.1. was released on 2017-05-02. Version 7.5 was released on 2019-11-14.
See also:
Questions tagged [gcc7]
74 questions
4
votes
1 answer
GCC 7 compilation error when using std::addressof
I am observing some strange behavior that I can't quite explain myself.
The code looks like this:
#include
#include
#include
int main(){
std::vector t1(10, 5.0);
std::vector t2(10);
…
hassec
- 686
- 4
- 18
3
votes
1 answer
Does GCC 7.3 contain all c++17 features?
I'm trying to build CMake project that use c++17 dialect with the CMake command:
set_target_properties(${PROJECT_NAME} PROPERTIES
CXX_STANDARD 17
CXX_EXTENSIONS OFF
)
I see that it set the compiler flag "-std=c++1z", but I still getting…
Nadav Sagie
- 31
- 2
3
votes
2 answers
Why I'm getting std::bad_variant_access with std::variant?
Consider:
#include
#include
int main()
{
double foo = 666.666;
std::variant v = foo;
std::cout << std::get(v) << std::endl;
return 0;
}
This results in:
terminate called after…
juzzlin
- 45,029
- 5
- 38
- 50
3
votes
1 answer
Will std::basic_string destroy null termination every time?
Recently, I update my compiler from gcc-4.3.x to gcc-7.x, and then meet an Assert exception for one of my tester.
The code looks like:
struct data {
data() : _c(0) { ++CREATED; std::cout<<"data CREATED +1"<<_c<<" addres: "<<&_c<
Maolin Tu
- 33
- 3
3
votes
0 answers
C++ support of _Float16
I want to do half-precision floating-point computations on Jetson AGX Xavier(with armv8.2 architecture) which supports half-precision floating-point natively. As _Float16 data type is an arithmetic data type for half-precision floating-point, I…
Sooora
- 171
- 9
3
votes
1 answer
Cannot use C libraries that include math.h with g++ 7 (Raspberry PI)
I've built GCC 7.2.0 for Raspberry PI, and installed it with prefix /usr/local/gcc-7.2.0 (using this tutorial). Whenever I try to compile a source that includes a C library that in turn includes math.h I get strange errors. Below is a minimal…
Azad Salahli
- 876
- 3
- 14
- 30
3
votes
1 answer
gcc gives no warning for comparing unsigned integer < 0 even with Wextra enabled
Take the following code
#include
template
T f(T x, unsigned y) {
if (y < 0) return x;
return static_cast(0);
}
using namespace std;
int main() {
int a = f(2, 3);
std::cout << a << std::endl;
return…
jureslak
- 195
- 2
- 9
3
votes
1 answer
How does `std::mem_fn` detect noexceptness in gcc 7.1.0
With gcc 7.1.0 std::mem_fn is able to detect noexcept-ness on a member function pointer. How does it do this? I thought the noexcept specifier was not a part of the function type?
What is even more confusing is when I remove the noexcept…
Curious
- 20,870
- 8
- 61
- 146
2
votes
2 answers
Is there a technique for named instances of an anonymous struct to reference functions inside the enclosing class?
I have a CRTP class where for API clarity during refactoring, I want to have a named anonymous struct containing methods, instead of having all methods at class scope. The problem is, these methods need access to the outer scope. For…
Chuu
- 4,301
- 2
- 28
- 54
2
votes
1 answer
Can't compile with gcc-7
I am trying to compile some code with GCC-7 on MacOS Catalina.
The GCC-7 was installed using homebrew brew install gcc@7
The code is the following:
#include
#include
double distance(double *a, double *b, int d) {
double…
sted
- 83
- 9
2
votes
1 answer
clang version 6.0.0 : clang++ "no member named 'make_optional' in namespace 'std' "
Till now I've been using gcc for compiling my C++ code in Ubuntu 16.04 server edition. But since the latest features of C++17 (mainly concurrency and parallelism) are not convered by the latest gcc, while in clang many of them are, I've been…
user2315094
- 759
- 3
- 16
- 29
2
votes
1 answer
Linking error with gcc/g++ 7.3.0 on ubuntu 18.04
I have a project where I link to the BLAS library using the -lcblas flag. It used to compile fine, until after upgrading my system to Ubuntu 18.04 and GCC 7.3.0. Anyway, the compile command is
g++ -o @$ benchmark.o mine.o -lcblas
which yields the…
Adrian
- 25
- 1
- 3
2
votes
0 answers
Building Gktmm 3.91 from source using gcc 7
OS : Ubuntu 16.04 LTS
Compiler : Gcc7.2
I want to add Gtkmm3.9 as a third party dependency for one of my project and I try to compile from the source. I'm not familiar with autoconf or automake toolset.
Going through the documentation…
Janakiraman Kannan
- 46
- 5
2
votes
1 answer
std::async with gcc 7.2 need pthread link option
The following code need pthread link option to compile, and i don't understand why. Do you have any idea?
I'm using gcc 7.2.0
#include
int sum = 0;
void func()
{
for(int i=0; i < 10; ++i)
sum +=i;
}
int main()
{
…
bonpiedlaroute
- 173
- 1
- 9
2
votes
1 answer
libstdc++ static linking & System V ABI
When I compile with -static-libstdc++, compiled binary uses UNIX - GNU ABI, but I need to get a binary with UNIX - System V ABI. (I need a compatibility with FreeBSD)
I also tried Compile libstdc++ with hash style SYSV, but it doesn't help.
$…
Artem
- 91
- 8