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Questions tagged [gcc9]

GCC 9 is a major release of the GNU Compiler collection first released in 2019.

Version 9.1 was released on 2019-05-03. Version 9.3 was released on 2020-03-12.

See also:

46 questions
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Can this incomplete type be improved to work with this C++ concept?

The following code works as designed with g++ 9.3.1 and the old concepts TS. But I haven't gotten it to work with g++ 10.3.1 and the C++ core language version of concepts: #if __cpp_concepts < 201707 # define CONCEPT concept bool #else # define…
dave_k_smith
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Offset of a member from a member object pointer in gcc 9

I previously used this to extract a size_t offset to a member of an object based on passing in the member object pointer. template constexpr size_t memberOffset(U T::*member) { return (char*)&((T*)nullptr->*member) -…
Daniel Moodie
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Where can I find the GCC 9 implementation of std::chrono::system_clock::now()?

The chrono system header (/usr/include/c++/9/chrono) declares, but does not define, the static now() functions of its clocks. I also do not see an include that looks relevant. Where are these functions implemented?
Felix Dombek
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Forcing instantiation of all of a template classes member functions

During initial development of a template class, before I've written full test cases, I am finding that I would like the ability to force the compiler to generate the code for every member (including non-static ones) of a template class for a…
Jason C
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C++17, string + string_view gives compilation error

As per the C++17 book from "Nicolai M. Josuttis" the following code should compile. #include #include int main() { std::string_view sv1 = "hello"; std::string_view sv2 = "world"; auto s =…
Amit Mishra
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It is possible to getting stuck in the compare_exchange's loop?

Consider this code (from 'C++ concurrency in action' [Second edition]: page 212): void LockFreeStack::pop (stack_data& result) { Node* old_head = head.load(); while(!head.compare_exchange_weak(old_head, old_head->next)) ; result…
Ghasem Ramezani
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__FLT_MAX__ and __DBL_MAX__ to 0?

With GCC 9.1, when calling std::numeric_limits's functions with floating-point types, they return 0 in most cases. This happens in a project I'm working on, and there is no issue with MSVC, GCC 8.3 or Clang 8.0. ::epsilon() sometimes has a…
Razakhel
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Get warning for left shifting a negative number

I am trying to generate a warning for undefined behavior on left shifting a negative number. According to this answer, left shift of a negative number in C is undefined. The result of E1 << E2 is E1 left-shifted E2 bit positions; vacated bits are…
abjoshi - Reinstate Monica
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using coverity 2019.03

I m using coverity 2019.03 After the configuration I have the message the Successfully generated configuration for the compilers: g++ g++-3 g++-4 gcc gcc-3 gcc-4 ld but when trying to build , I have : [WARNING] No files were emitted. This may be due…
abirb
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coredump when calling virtual method of a dynamic allocated object

The snippet below will coredumped in fun() method. Why calling c->b.f() works in main() but failed in the function call? class A { public: inline virtual void f() const {printf("A\n");} }; class B : public A { public: inline void f() const…
brayden
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c++ unorderd_map insert fails for value_type with atomic member

class strategy { int id; std::atomic strategyStarted; int startTime; int endTime; void getStartTime() { return startTime; } void setStartTime(int sTime) { startTime = sTime; } }; class strategyImpl{ …
Prabal Kajla
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Build gcc-9.1.0 error with libgfortran.so

I tried to install gcc-9.1.0 version with gcc-5 and the following configure options: ../gcc-9.1.0/configure --prefix=local/gcc/9.1.0-all \ --program-suffix='-10' \ --without-included-gettext \ --enable-threads=posix \ …
MakeUbuntu
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Why is GCC complaining with Wstringop-overflow?

I have code which looks like this: char* newChar = new char[strlen(inputCharArray)+1]; if (NULL == newChar) { return; } strncpy(newChar, inputCharArray, strlen(inputCharArray)); newChar[strlen(inputCharArray)] = '\0'; This seems for me like…
Sir2B
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Link with -rpath=/usr/local/lib works, -rapth=$ORIGIN does not

I am working on an embedded Linux target, gcc 9.2. If I link with -rpath=/usr/local/lib, the readelf utility shows me the RPATH entry, as expected. If I link with -rpath=$ORIGIN, readelf shows no RAPTH, and nothing involving ORIGIN. The link command…
Phillip
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