[Cmake] ADD_CUSTOM_COMMAND and PRE_BUILD

[Amit Ramesh]

Hi,

     I am currently in a situation where I need a pre_build step  
under Linux. I see that CMake does not handle pre_build in the case  
of Makefiles, and the last posting I see on this topic (posted Apr  
2004, appended below) says that it may not be possible to implement  
pre_build in Makefiles. Couldn't the following strategy be used to  
achieve it though?

     If x is a pre_build condition for y, then I agree that the  
following will end up as a pre_link:

     y: x
        generate y

     However, if one ensures that x occurs before y in an initial  
build rule, like:

     all: x y

     x:
        generate x

     y: z w
        generate y

     Then x will get done before y or its dependencies (assuming no  
parallel builds).

     I agree that if one invokes 'make y' instead of 'make' or 'make  
all', then x will not get done. So this is only a partial/incomplete  
solution to the problem. However, it would still be better than not  
having any support for pre_build.

     Let me know.

Thanks
Amit


Ken Martin wrote:

PRE_BUILD and PRE_LINK are the same for Visual Studio 6 and all  
makefiles.
They both act like PRE_LINK. (Brad said they were POST_BUILD which if  
so we
need to change to PRE_LINK) Thanks for the reminder. We intended to  
modify
the rules for the Makefile to support PRE_BUILD but looking into it  
quickly
I'm not sure makefiles can handle PRE_BUILD. PRE_BUILD can be pretty  
useful
but if only Visual Studio 7 can handle it then we may have to remove it.

Thanks
Ken

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