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e544ea57 AB |
1 | /* SPDX-License-Identifier: GPL-2.0 */ |
2 | /* | |
3 | * When building position independent code with GCC using the -fPIC option, | |
4 | * (or even the -fPIE one on older versions), it will assume that we are | |
5 | * building a dynamic object (either a shared library or an executable) that | |
6 | * may have symbol references that can only be resolved at load time. For a | |
7 | * variety of reasons (ELF symbol preemption, the CoW footprint of the section | |
8 | * that is modified by the loader), this results in all references to symbols | |
9 | * with external linkage to go via entries in the Global Offset Table (GOT), | |
10 | * which carries absolute addresses which need to be fixed up when the | |
11 | * executable image is loaded at an offset which is different from its link | |
12 | * time offset. | |
13 | * | |
14 | * Fortunately, there is a way to inform the compiler that such symbol | |
15 | * references will be satisfied at link time rather than at load time, by | |
16 | * giving them 'hidden' visibility. | |
17 | */ | |
18 | ||
19 | #pragma GCC visibility push(hidden) |