[CMake] avoid rebuilding targets depending on generated source files

[Ajay Panyala]

Try "cmake -E copy_if_different ..."

cmake -E copy_if_different build/test1.c build/tests/test1.c

That would work when make is run atleast once.
When running make for the 1st time test1.c was never
copied to build/tests before. So I would be comparing a file with
another non-existant file and that would result in an error halting
the make process.

Thanks
Ajay

On Sat, Mar 3, 2012 at 1:20 PM, Hendrik Sattler <post at hendrik-sattler.de>wrote:

> Am Samstag, 3. März 2012, 21:41:49 schrieb Ajay Panyala:
> > I have a custom target which runs a command to generate
> > a C source file say test1.c
> >
> > ADD_CUSTOM_TARGET(TestGen ALL
> > COMMAND genExec ${PROJECT_SOURCE_DIR}/Main.java
> > DEPENDS ${PROJECT_SOURCE_DIR}/Main.java
> > )
> >
> > And I have a custom command that moves the generated *test1.c *
> > to a new directory inside the build directory.
> >
> > ADD_CUSTOM_COMMAND(
> > TARGET TestGen
> > POST_BUILD
> > COMMAND mv
> > ARGS ${PROJECT_BINARY_DIR}/test1.c ${PROJECT_BINARY_DIR}/tests/
> > )
> >
> > Each time I run make, the custom target is run (since custom targets are
> > always
> > out-of-date). But I want to avoid moving the new test1.c generated each
> > time if build/test1.c is the same as build/tests/test1.c since there are
> > other targets
> > like add_executable and add_library later in the CMakelists file that are
> >  re-built
> > each time since they depend on test1.c
>
> Try "cmake -E copy_if_different ..."
>
> HS
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