[CMake] Ninja: Avoiding unnecessary rebuilds with generated files

[Miller, Frank]

This has been fixed.

http://www.cmake.org/Bug/view.php?id=13592

Frank

> -----Original Message-----
> From: cmake-bounces at cmake.org [mailto:cmake-bounces at cmake.org] On
> Behalf Of Florian Weimer
> Sent: Sunday, May 05, 2013 7:17 AM
> To: cmake at cmake.org
> Subject: [CMake] Ninja: Avoiding unnecessary rebuilds with generated files
>
> I've got a custom command which mangles a text file so that it can be linked
> into the program:
>
> add_custom_command (
>   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/schema.sql.inc
>   COMMAND xxd -i < ${PROJECT_SOURCE_DIR}/schema.sql >
> ${CMAKE_CURRENT_BINARY_DIR}/schema.sql.inc
>   DEPENDS schema.sql
> )
>
> The generated file is then referenced from a library:
>
> add_library (SymbolDB
>   lib/symboldb/database.cpp
>   lib/symboldb/download.cpp
>   ... (more *.cpp files)
>   ${CMAKE_CURRENT_BINARY_DIR}/schema.sql.inc
> )
>
> Full CMakeLists.txt is here:
> <https://github.com/fweimer/symboldb/blob/master/CMakeLists.txt>
>
> With cmake 2.8.10, this triggers a rebuild of all the the *.cpp files listed above
> when schema.sql changes.  But only lib/symboldb/database.cpp includes
> schema.sql.inc and therefore needs rebuilding.
>
> It seems that these unnecessary rebuilds only happen with the Ninja
> generator.  I don't see it with the make generator.  Could this be a bug in the
> Ninja generator?
> --
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