The pedantically correct way to check that a .so exports a symbol is nm –demangle –dynamic –defined-only –extern-only <lib.so> | grep <symbol>. Without –defined-only your command also shows undefined symbols. Without –extern-only it also shows symbols with internal linkage which are unavailable for linking. It looks like you need to link another library because Gps_Ephemeris::Gps_Ephermeris() … Read more
This is core issue 1343 “Sequencing of non-class initialization”, which was accepted as a Defect Report in November 2016 by paper P0570R0. The resolution proposed is part of C++17 but not therefore part of C++14, so (unless the committee decide to publish a corrigendum to C++14) this is a point of difference between C++17 and … Read more
You can’t have non-default parameters after your default parameters begin. Put another way, how would you specify a value for b leaving word to the default of “hello” ?
The GCC documentation describes what these options do very explicitly. -O3 tries to optimize code very heavily for performance. It includes all of the optimizations -O2 includes, plus some more. -Os, on the other hand, instructs GCC to “optimize for size.” It enables all -O2 optimizations which do not increase the size of the executable, … Read more
-fprofile-generate will instrument the application with profiling code. The application will, while actually running, log certain events that could improve performance if this usage pattern was known at compile time. Branches, possibility for inlining, etc, can all be logged, but I’m not sure in detail how GCC implements this. After the program exits, it will … Read more
Since c is of type const Cache *, you can only call const member functions on it. You have two options: (1) remove const from the declaration of c; (2) change Cache::write() like so: bool write(const MemoryAccess &memory_access, CacheLine &cl) const; (Note the added const at the end.)
GCC 9 has them but you have to install TBB separately In Ubuntu 19.10, all components have finally aligned: GCC 9 is the default one, and the minimum required version for TBB TBB (Intel Thread Building Blocks) is at 2019~U8-1, so it meets the minimum 2018 requirement so you can simply do: sudo apt install … Read more
The declaration and definition of insertLike are different In your header file: void insertLike(const char sentence[], const int lengthTo, const int length, const char writeTo[]); In your ‘function file’: void insertLike(const char sentence[], const int lengthTo, const int length,char writeTo[]); C++ allows function overloading, where you can have multiple functions/methods with the same name, as … Read more
The files are being removed because make considers them “intermediate”. When make forms a chain of rules to produce a prerequisite, it treats all files created by the intermediate chains as “intermediate” and removes then when the target is created. See Chained Rules in the manual for GNU make. In your case, you can prevent … Read more
As of Fri, 7 Aug 2015 01:44:49 -0400 (05:44 +0000) concepts support has been merged into gcc’s trunk. Using a build from after that point, you can enable concepts support with the -std=c++1z flag. As of gcc 6.1 (27-04-2016), concepts are enabled by -fconcepts as they are unlikely to be included in C++17, so they … Read more