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https://git.kernel.org/pub/scm/network/wireless/iwd.git
synced 2024-10-06 11:28:38 +02:00
fa1c12453b
LLD 13 and GNU ld 2.37 support -z start-stop-gc which allows garbage collection of C identifier name sections despite the __start_/__stop_ references. GNU ld before 2015-10 had the behavior as well. Simply set the retain attribute so that GCC 11 (if configure-time binutils is 2.36 or newer)/Clang 13 will set the SHF_GNU_RETAIN section attribute to prevent garbage collection. Without the patch, there are linker errors with -z start-stop-gc (LLD default) when -Wl,--gc-sections is used: ``` ld.lld: error: undefined symbol: __start___eap >>> referenced by eap.c >>> src/eap.o:(eap_init) ``` The remain attribute will not be needed if the metadata sections are referenced by code directly.
58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2019 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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struct iwd_module_desc {
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const char *name;
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int (*init)(void);
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void (*exit)(void);
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bool active;
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} __attribute__((aligned(8)));
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struct iwd_module_depends {
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const char *self;
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const char *target;
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};
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#define IWD_MODULE(name, init, exit) \
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_Pragma("GCC diagnostic push") \
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_Pragma("GCC diagnostic ignored \"-Wattributes\"") \
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static struct iwd_module_desc __iwd_module_ ## name \
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__attribute__((used, retain, section("__iwd_module"), \
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aligned(8))) = { \
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#name, init, exit \
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}; \
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_Pragma("GCC diagnostic pop")
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#define IWD_MODULE_DEPENDS(name, dep) \
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_Pragma("GCC diagnostic push") \
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_Pragma("GCC diagnostic ignored \"-Wattributes\"") \
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static struct iwd_module_depends __iwd_module__##name##_##dep \
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__attribute__((used, retain, \
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section("__iwd_module_dep"), aligned(8))) = { \
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.self = #name, \
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.target = #dep, \
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}; \
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_Pragma("GCC diagnostic pop")
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int iwd_modules_init(void);
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void iwd_modules_exit(void);
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