[CMake] Redirect stdout from COMMAND in ADD_CUSTOM_COMMAND (CMake 2.6 RC8)

[Alejandro Morell Garcí­a]

I'm trying to convert the following script into CMake add_custom_command:

    echo #include "glib-object.h" > gstmarshal.c.tmp
    echo #include "gstmarshal.h" >> gstmarshal.c.tmp
    glib-genmarshal --body --prefix=gst_marshal 
..\..\gst\gstmarshal.list >> gstmarshal.c.tmp
    move gstmarshal.c.tmp ..\..\gst\gstmarshal.c
    echo #include "gst/gstconfig.h" > gstmarshal.h.tmp
    glib-genmarshal --header --prefix=gst_marshal 
..\..\gst\gstmarshal.list >> gstmarshal.h.tmp
    move gstmarshal.h.tmp ..\..\gst\gstmarshal.h

That I translated in a more simple "cmake script":

    FILE(WRITE ${CMAKE_BINARY_DIR}/gst/gstmarshal.c.template
        "#include \"glib-object.h\"" "\n" "#include \"gstmarshal.h\"" "\n")

    ADD_CUSTOM_COMMAND(OUTPUT gstmarshal.c
        COMMAND ${CMAKE_COMMAND} -E copy gstmarshal.c.template gstmarshal.c
        COMMAND glib-genmarshal --body --prefix=gst_marshal 
${CMAKE_CURRENT_SOURCE_DIR}/gstmarshal.list >> gstmarshal.c
        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/gst/
        COMMENT "Generating flex and bison parsers" VERBATIM
    )

If I create a linux makefile, the make fails with:

(process:11394): GLib-Genmarshal-WARNING **: failed to open ">>": No 
such file or directory

and all stdout from glib-genmarshal is echoed in terminal.

Inspecting Makefile, the problem seems this (file 
gst/CMakeFiles/libgstreamer.dir/build.make):

cd /home/alejandro/Proyectos/gstreamer/gstreamer-0.10.19/build/gst/ && 
glib-genmarshal --body --prefix=gst_marshal 
/home/alejandro/Proyectos/gstreamer/gstreamer-0.10.19/gst/gstmarshal.list 
">>" gstmarshal.c

Cmake coutes >> operator, so no redirecting is done.

Someone knows how to avoid this?

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