[cmake-developers] [PATCH] Use full path for all source files in ninja build.

[Brad King]

On 08/02/2016 04:42 PM, Chaoren Lin wrote:
> Our IDE uses "cmake --build /path/to/build" to invoke the build,
> so that we only have to deal with CMake and not the underlying build system.

If you know /path/to/build why not just interpret relative paths with
respect to it as a heuristic?  If the paths exist then use them.

> Maybe I can try to fix ninja to resolve paths before sending them to the compiler.

The ninja build tool itself does not have enough information to make
such a transformation.  CMake does though.  See below.

> Or maybe just add a flag to ConvertToNinjaPath or something. 

ConvertToNinjaPath is called from several places that don't all know
whether the file they are passing is a source file for compilation
or not.

Another approach is to use ConvertToNinjaPath for all the build.ninja
inputs and outputs on build statements but use something other than $in
for the source file on the compilation rule.  Using an "IN_ABS = ..."
variable could achieve this.

-Brad