Bob:
This is a fundamental change. It needs more review and test.
But now, 201911 stable tag softfreeze will be coming on 11-15. So, I don't
think this change will catch 201911 stable tag. Right?
Thanks
Liming
>-Original Message-
>From: devel@edk2.groups.io [mailto:devel@edk2.groups.io] On Behalf Of
>Bob Feng
>Sent: Monday, November 11, 2019 5:40 PM
>To: devel@edk2.groups.io
>Subject: [edk2-devel] [Patch 0/4] Enhance Incremental Build
>
>Incremental build reduces the build time by only building
>the module that need to update. Edk2 Build system is a Makefile
>based build system. The incrememtal build ability is provided by
>the Make program. But Edk2 build tool need to generate correct makefile
>to have Make program do incremental build correctly.
>
>The current solution in build tool to support incremental build is that build
>tool find out the include file list for each source file of a module, and in
>module's
>makefile, build tool add the include file list as the source file's dependency.
>In this way Make program can decide if it need to rebuild a source code by
>checking
>its dependency. This solution has 2 shortcommings, one is the process of
>finding
>include list is slow, the other is this method can't handle case that
>a MACRO in #include statement so the related source file is always built.
>
>This patch provides another method to support incremental build. That is to
>use
>c preprocessor and trim tool to generate dependency files for the source file.
>This method will save much time in AutoGen phase and handle MACRO in
>#include correctly.
>
>For C files:
>1. MSVS.
>cl.exe has a build option /showIncludes to display include files on
> stdout.
>Build tool captures
>that messages and generate dependency files, .deps files.
>2. CLANG and GCC
>-MMD -MF build option are used to generate dependency files by
>preprocessor. Build tool updates the
> .deps files.
>For ASL files:
>1. Trim find out all the included files, which are asl specific include
> format,
>and generate .trim.deps file.
>2. ASL PP use c preprocessor to find out all included files with #include
>format and generate a .deps file
>3. build tool updates the .deps file
>For ASM files (.asm, .s or .nasm):
>1. Trim find out all the included files, which are asm specific include
> format,
>and generate .trim.deps file.
>2. ASM PP use c preprocessor to find out all included files with #include
>format and generate a deps file
>3. build tool updates the .deps file
>
>Build tool add "include" instruction for those deps files in the Makefile.
>
>This patch does not support RVCT tool chain for the BZ
>https://bugzilla.tianocore.org/show_bug.cgi?id=1750
>
>Feng, Bob C (4):
> BaseTools: Add build option for dependency file generation
> BaseTools: Generate dependent files for ASL and ASM files
> BaseTools: Update build_rule.txt to generate dependent files.
> BaseTools: Enhance Basetool for incremental build
>
> BaseTools/Conf/build_rule.template| 94 ---
> BaseTools/Conf/tools_def.template | 173 ++--
> BaseTools/Source/Python/AutoGen/GenMake.py| 83 ++
> .../Source/Python/AutoGen/IncludesAutoGen.py | 255
>++
> .../Source/Python/AutoGen/ModuleAutoGen.py| 23 ++
> BaseTools/Source/Python/Trim/Trim.py | 115 ++--
> BaseTools/Source/Python/build/build.py| 63 -
> 7 files changed, 588 insertions(+), 218 deletions(-)
> create mode 100644
>BaseTools/Source/Python/AutoGen/IncludesAutoGen.py
>
>--
>2.20.1.windows.1
>
>
>
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