[llvm-dev] [CMake] Re-configuring Debug and Release builds

[via llvm-dev]

> -----Original Message-----
> From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of David
> Greene via llvm-dev
> Sent: Friday, March 08, 2019 10:49 AM
> To: llvm-dev at lists.llvm.org
> Subject: [llvm-dev] [CMake] Re-configuring Debug and Release builds
> 
> If I've configured a Release build, build it and then go back and re-run
> cmake with -DCMAKE_BUILD_TYPE=Debug (and nothing else changed), almost
> nothing gets rebuilt when I try to build.  Is this expected?  I know I
> can edit CMakeCache.txt directly and trigger an essentially full
> rebuild.

IME rerunning CMake with new options really does nothing; CMakeCache.txt
appears to override the command line, which is not intuitive but seems
to be how it actually works.

I would hope that this is not a choice made by the LLVM project but a
bug/feature of CMake itself.  But I haven't ever had the energy to 
pursue it.
--paulr

> 
>                              -David
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