Thanks for your update. I verify this enhancement. It is great. Now, I have 
some minor comments. Can you help check them?

1. This change requires tools_def and build_rule be updated together. If they 
are not updated, what will happen? Can build tool report the error and let user 
update them?
2. C compiler will generate the include file list for all other files except 
for ASL and Nasm,, and output the include file into the screen. Build tool 
catches them, and creates the file xxx.deps. Can Build tool generate xxx.deps 
in the same output directory with the output file? For example, if C source 
output file is generated into OUTPUT\X64 directory, its deps file is also 
generated into OUTPUT\X64 directory. 
3. Do you verify the error case? For example, if C source file doesn't pass 
compile, its deps will still be generated or not?

> -----Original Message-----
> From: <> On Behalf Of Bob Feng
> Sent: Tuesday, December 3, 2019 4:53 PM
> To:
> Subject: [edk2-devel] [Patch 0/4 V4] Enhance Incremental Build
> V4: Add $(DEPS_FLAGS) for rule [C-Code-File.BASE.AARCH64 ...]
> V3: Change CLANG9 to CLANGPDB according to commit 14672c34bd
> V2: Fixed a bug in patch 4/4.
> 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 
> 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/    |  83 ++----
>  .../Source/Python/AutoGen/  | 255 ++++++++++++++++++
>  .../Source/Python/AutoGen/    |  23 ++
>  BaseTools/Source/Python/Trim/          | 115 ++++++--
>  BaseTools/Source/Python/build/        |  63 ++++-
>  7 files changed, 588 insertions(+), 218 deletions(-)
>  create mode 100644 BaseTools/Source/Python/AutoGen/
> --

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