Re: [edk2-devel] [PATCH] BaseTools: Fix an incremental build issue caused by macro in #include

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Hi Derek,

On 10/16/19 8:17 AM, Lin, Derek (HPS SW) wrote:
> When c/h file use macro after #include, for example,

Apparently you forgot to write your example.

> In this case, GenMake is not able to create a healthy dependency for the c
> file. GenMake used to add $(FORCE_REBUILD) dependency in the c file, this
> guarantee the c file is always compiled in incremental build. But, this
> function is broken since 05217d210e8da37b47d0be58ec363f7af2fa1c18 which
> enable /MP for MSVC compiler, in order to compile multiple c files in one
> command multi-processing. The fix here is adding '$(FORCE_REBUILD)' back to
> retain the original function.
> 
> Line number 1728 and 978 are the code pieces which handle this logic.
> 
> Signed-off-by: Derek Lin <derek.lin2@hpe.com>
> ---
>   BaseTools/Source/Python/AutoGen/GenMake.py | 18 +++++++++++-------
>   1 file changed, 11 insertions(+), 7 deletions(-)
> 
> diff --git a/BaseTools/Source/Python/AutoGen/GenMake.py b/BaseTools/Source/Python/AutoGen/GenMake.py
> index 97ba158ff2..59a01a7f24 100755
> --- a/BaseTools/Source/Python/AutoGen/GenMake.py
> +++ b/BaseTools/Source/Python/AutoGen/GenMake.py
> @@ -1080,13 +1080,17 @@ cleanlib:
>                       else:
>                           CmdCppDict[item.Target.SubDir] = ['$(MAKE_FILE)', Path]
>                       if CppPath.Path in DependencyDict:
> -                        for Temp in DependencyDict[CppPath.Path]:
> -                            try:
> -                                Path = self.PlaceMacro(Temp.Path, self.Macros)
> -                            except:
> -                                continue
> -                            if Path not in (self.CommonFileDependency + CmdCppDict[item.Target.SubDir]):
> -                                CmdCppDict[item.Target.SubDir].append(Path)
> +                        if '$(FORCE_REBUILD)' in DependencyDict[CppPath.Path]:
> +                            if '$(FORCE_REBUILD)' not in (self.CommonFileDependency + CmdCppDict[item.Target.SubDir]):
> +                                CmdCppDict[item.Target.SubDir].append('$(FORCE_REBUILD)')
> +                        else:
> +                            for Temp in DependencyDict[CppPath.Path]:
> +                                try:
> +                                    Path = self.PlaceMacro(Temp.Path, self.Macros)
> +                                except:
> +                                    continue
> +                                if Path not in (self.CommonFileDependency + CmdCppDict[item.Target.SubDir]):
> +                                    CmdCppDict[item.Target.SubDir].append(Path)
>           if T.Commands:
>               CommandList = T.Commands[:]
>               for Item in CommandList[:]:
>