gcc – Page 2 – IT Nursery

Why does the order in which libraries are linked sometimes cause errors in GCC?

May 2, 2022 by IT Nursery

Why does the order in which libraries are linked sometimes cause errors in GCC? 9 s 9 (See the history on this answer to get the more elaborate text, but I now think it’s easier for the reader to see real command lines). Common files shared by all below commands $ cat a.cpp extern int … Read more

Why doesn’t GCC optimize aaaaaa to (aaa)(aaa)?

April 10, 2022 by IT Nursery

I am doing some numerical optimization on a scientific application. One thing I noticed is that GCC will optimize the call pow(a,2) by compiling it into a*a, but the call pow(a,6) is not optimized and will actually call the library function pow, which greatly slows down the performance. (In contrast, Intel C++ Compiler, executable icc, … Read more