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List:       cmake
Subject:    Re: [CMake] Custom compile command?
From:       Bill Hoffman <bill.hoffman () kitware ! com>
Date:       2009-06-04 20:57:22
Message-ID: 4A283532.8010305 () kitware ! com
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Bob Tanner wrote:
> I'm moving an open source project (netrek) to cmake. Things are going 
> great except for 1 fairly convoluted Makefile snippet listed below:
> 

Cool!

I used to love Xtrek!  I wasted many hours playing that at GE in the 
early 90's.

> 
> commands_mars.o: $(PMAKE) ${srcdir}/../ntserv/commands.c
>        $(CC) $(CFLAGS) $(DEP) -DDOG -c ${srcdir}/../ntserv/commands.c -o 
> commands_mars.o
> 
> commands_puck.o: $(PMAKE) ${srcdir}/../ntserv/commands.c
>        $(CC) $(CFLAGS) $(DEP) -DPUCK -c ${srcdir}/../ntserv/commands.c 
> -o commands_puck.o
> 
> commands.o: $(PMAKE) ${srcdir}/../ntserv/commands.c
>        $(CC) $(CFLAGS) $(DEP) -c ${srcdir}/../ntserv/commands.c -o 
> commands.o
> 
> commands_basep.o: $(PMAKE) ${srcdir}/../ntserv/commands.c
>        $(CC) $(CFLAGS) $(DEP) -DBASEP -c ${srcdir}/../ntserv/commands.c 
> -o commands_basep.o
> 
You could use configure_file to do this.

Something like this:

set(COMMANDS_TYPE DOG)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/commands.c.in
                ${CMAKE_CURRENT_BINARY_DIR}/commands_mars.c)
set(COMMANDS_TYPE PUCK)
configure_file(${CMAKE_CURRENT_SOURCE_DIR}/commands.c.in
                ${CMAKE_CURRENT_BINARY_DIR}/commands_puck.c)

Where commands.c.in looks like this:
#define ${COMMANDS_TYPE}
#include "${CMAKE_CURRENT_SOURCE_DIR}/commands.c"

add_library(mylib
            ${CMAKE_CURRENT_BINARY_DIR}/commands_mars.c
            ${CMAKE_CURRENT_BINARY_DIR}/commands_puck.c)


-Bill
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