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004ff59828
This is needed to ensure that the pointer is not removed by an optimization pass. Theoretically, we'd have to add both 'used' and 'retain' attributes, however for PE targets 'used' includes the effect of 'retain' [1], and GCC warns if 'retain' is used in PE targets. Fixes the constructor test in LTO builds. [1] https://reviews.llvm.org/D96838
70 lines
2.5 KiB
C
70 lines
2.5 KiB
C
/*
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* Copyright © 2023 Luca Bacci
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "gconstructor.h"
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#ifdef _WIN32
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#include <windows.h>
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#endif
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#ifdef _WIN32
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#ifdef __cplusplus
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/* const defaults to static (internal visibility) in C++,
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* but we want extern instead */
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#define G_EXTERN_CONST extern const
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#else
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/* Using extern const in C is perfectly valid, but triggers
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* a warning in GCC and CLANG, therefore we avoid it */
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#define G_EXTERN_CONST const
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#endif
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#ifdef _MSC_VER
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#define G_HAS_TLS_CALLBACKS 1
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#define G_DEFINE_TLS_CALLBACK(func) \
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__pragma (section (".CRT$XLCE", long, read)) \
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\
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static void NTAPI func (PVOID, DWORD, PVOID); \
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\
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G_BEGIN_DECLS \
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__declspec (allocate (".CRT$XLCE")) \
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G_EXTERN_CONST PIMAGE_TLS_CALLBACK _ptr_##func = func; \
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G_END_DECLS \
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\
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__pragma (comment (linker, "/INCLUDE:" G_MSVC_SYMBOL_PREFIX "_tls_used")) \
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__pragma (comment (linker, "/INCLUDE:" G_MSVC_SYMBOL_PREFIX "_ptr_" #func))
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#else
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#define G_HAS_TLS_CALLBACKS 1
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#define G_DEFINE_TLS_CALLBACK(func) \
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static void NTAPI func (PVOID, DWORD, PVOID); \
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\
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G_BEGIN_DECLS \
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__attribute__ ((section (".CRT$XLCE"), used)) \
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G_EXTERN_CONST PIMAGE_TLS_CALLBACK _ptr_##func = func; \
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G_END_DECLS
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#endif /* _MSC_VER */
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#endif /* _WIN32 */
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