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2026-02-24MdePkg: Replace include guards with #pragma onceMichael Kubacki1-4/+1
Replace traditional `#ifndef`/`#define`/`#endif` include guards with `#pragma` once. `#pragma once` is a widely supported preprocessor directive that prevents header files from being included multiple times. It is supported by all toolchains used to build edk2: GCC, Clang/LLVM, and MSVC. Compared to macro-based include guards, `#pragma once`: - Eliminates the risk of macro name collisions or copy/paste errors where two headers inadvertently use the same guard macro. - Eliminate inconsistency in the way include guard macros are named (e.g., some files use `__FILE_H__`, others use `FILE_H_`, etc.). - Reduces boilerplate (three lines replaced by one). - Avoids polluting the macro namespace with guard symbols. - Can improve build times as the preprocessor can skip re-opening the file entirely, rather than re-reading it to find the matching `#endif` ("multiple-include optimization"). - Note that some compilers may already optimize traditional include guards, by recognzining the idiomatic pattern. This change is made acknowledging that overall portability of the code will technically be reduced, as `#pragma once` is not part of the C/C++ standards. However, this is considered acceptable given: 1. edk2 already defines a subset of supported compilers in BaseTools/Conf/tools_def.template, all of which have supported `#pragma once` for over two decades. 2. There have been concerns raised to the project about inconsistent include guard naming and potential macro collisions. Approximate compiler support dates: - MSVC: Supported since Visual C++ 4.2 (1996) - GCC: Supported since 3.4 (2004) (http://gnu.ist.utl.pt/software/gcc/gcc-3.4/changes.html) - Clang (LLVM based): Since initial release in 2007 Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com>
2021-12-07MdePkg: Apply uncrustify changesMichael Kubacki1-2/+2
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3737 Apply uncrustify changes to .c/.h files in the MdePkg package Cc: Andrew Fish <afish@apple.com> Cc: Leif Lindholm <leif@nuviainc.com> Cc: Michael D Kinney <michael.d.kinney@intel.com> Signed-off-by: Michael Kubacki <michael.kubacki@microsoft.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn>
2019-04-09MdePkg: Replace BSD License with BSD+Patent LicenseMichael D Kinney1-7/+1
https://bugzilla.tianocore.org/show_bug.cgi?id=1373 Replace BSD 2-Clause License with BSD+Patent License. This change is based on the following emails: https://lists.01.org/pipermail/edk2-devel/2019-February/036260.html https://lists.01.org/pipermail/edk2-devel/2018-October/030385.html RFCs with detailed process for the license change: V3: https://lists.01.org/pipermail/edk2-devel/2019-March/038116.html V2: https://lists.01.org/pipermail/edk2-devel/2019-March/037669.html V1: https://lists.01.org/pipermail/edk2-devel/2019-March/037500.html Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com> Reviewed-by: Liming Gao <liming.gao@intel.com>
2018-06-28MdePkg: Clean up source filesLiming Gao1-8/+8
1. Do not use tab characters 2. No trailing white space in one line 3. All files must end with CRLF Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Liming Gao <liming.gao@intel.com>
2010-04-23Update the copyright notice formathhtian1-2/+2
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@10403 6f19259b-4bc3-4df7-8a09-765794883524
2009-06-04Second set of changes based on a review of the code comments in the Include ↵pkandel1-1/+1
directory for typos, grammar issues, and language clarity. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8467 6f19259b-4bc3-4df7-8a09-765794883524
2008-12-29Update copyright for files modified in this yearqhuang81-1/+1
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7148 6f19259b-4bc3-4df7-8a09-765794883524
2008-12-16Clean up to update the reference of the these macros:qhuang81-1/+1
EFI_SIGNATURE_16 -> SIGNATURE_16 EFI_SIGNATURE_32 -> SIGNATURE_32 EFI_SIGNATURE_64 -> SIGNATURE_64 EFI_FIELD_OFFSET -> OFFSET_OF EFI_MAX_BIT -> MAX_BIT EFI_MAX_ADDRESS -> MAX_ADDRESS These macros are not defined in UEFI spec. It makes more sense to use the equivalent macros in Base.h to avoid alias. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@7055 6f19259b-4bc3-4df7-8a09-765794883524
2008-12-09Add the detailed descriptions for the structure data member in these protocol.lgao41-9/+4
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6935 6f19259b-4bc3-4df7-8a09-765794883524
2008-12-08Remove undefined comments for status PCD.lgao41-4/+6
Add comments for DebugImageInfoTable, FileInfo, FileSystemInfo and FileSystemVolumeLabelInfo Guid structure. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@6914 6f19259b-4bc3-4df7-8a09-765794883524
2007-11-22Clean up: update "EFI" to "UEFI" if applicable.qhuang81-1/+1
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@4317 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-28Updated headers to follow coding standardAJFISH1-2/+0
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2815 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-19Checked in the GUIDs introduced in UEFI/PI.yshang11-0/+42
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2675 6f19259b-4bc3-4df7-8a09-765794883524
2007-06-01Moved the MdePkg to OldMdePkg so that new code in MdePkg does not break ↵lhauch1-42/+0
existing builds. Also updated the SPD and FPD files UiNames git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2616 6f19259b-4bc3-4df7-8a09-765794883524
2006-11-29Output DxeCore Entrypoint in DxeIpl module, and make dxecore module can ↵lgao41-1/+1
correctly output >4G module entry point address. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@2033 6f19259b-4bc3-4df7-8a09-765794883524
2006-08-07Move FileInfo.h, FileSystemInfo.h, FileSystemVolumeLabelInfo.h from protocol ↵lgao41-0/+42
directory to guid directory, because these three files define the related GUID not protcol. git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1204 6f19259b-4bc3-4df7-8a09-765794883524
generated by cgit v1.2.3 (git 2.39.0) at 2026-10-01 19:47:00 +0300