include/linux/hidden.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 /*
0003  * When building position independent code with GCC using the -fPIC option,
0004  * (or even the -fPIE one on older versions), it will assume that we are
0005  * building a dynamic object (either a shared library or an executable) that
0006  * may have symbol references that can only be resolved at load time. For a
0007  * variety of reasons (ELF symbol preemption, the CoW footprint of the section
0008  * that is modified by the loader), this results in all references to symbols
0009  * with external linkage to go via entries in the Global Offset Table (GOT),
0010  * which carries absolute addresses which need to be fixed up when the
0011  * executable image is loaded at an offset which is different from its link
0012  * time offset.
0013  *
0014  * Fortunately, there is a way to inform the compiler that such symbol
0015  * references will be satisfied at link time rather than at load time, by
0016  * giving them 'hidden' visibility.
0017  */
0018
0019 #pragma GCC visibility push(hidden)