[CMake] Status of escaped characters in cmake?

[Chris Green]

Hi,

I've hit another problem with escaped characters: I wish to do a custom 
command which calls perl with -e '<here-script>'. I'm still bashing around 
with it, but what I have so far appears to confuse perl with lots of 
escaped spaces that I didn't ask for.

For instance:

 	  SET ( perl_cmd
 	    "'m%defined_in\\s+\\\"?([^\\\";]+)[\\\";]% and do \\
             {my @a = grep { -r \"$_/$1\" } split(\";\", 
\"${include_directories}\"); \\
             if ($a[0]) { $a[0]=\"$a[0]/$a[1]\"; \\
             s%(defined_in\\s+)\\\"?([^\\\";]+)\\\"?%$1$a[0];%}};'"
 	    )
 	  MESSAGE ( STATUS "perl_cmd = ${perl_cmd}" )
 	  ADD_CUSTOM_COMMAND (
 	    OUTPUT ${linkdef_h_file}
 	    MAIN_DEPENDENCY ${linkdef_h_in_file}
 	    COMMAND ${PERL}
 	    ARGS -wpe ${perl_cmd}
             ${linkdef_h_in_file} > ${linkdef_h_file}
 	    )

produces:

# CMAKE generated file: DO NOT EDIT!
# Generated by "Unix Makefiles" Generator, CMake Version 2.2
# Custom command rule file for PlotFile_linkdef.h.
VLAND_root_util/src/PlotFile_linkdef.h: 
../../../afs/fnal.gov/files/home/room3/greenc/VLAND/VLAND-test/VLAND_root_util/src/PlotFile_linkdef.h.in
VLAND_root_util/src/PlotFile_linkdef.h: 
VLAND_root_util/src/VLAND_root_util.dir/PlotFile_linkdef.h.build.make
         @echo "Generating PlotFile_linkdef.h"
         cd /scratch1/greenc/VLAND-test_build/VLAND_root_util/src && 
/usr/local/bin/perl -wpe 'm%defined_in\s+\"?([^\";]+)[\";]%\ and\ do\ \
\ \ \ \ \ \ \ \ \ \ \ \ {my\ @a\ =\ grep\ {\ -r\ "$_/$1"\ }\ split(" ",\ "/afs/fnal.gov/files/home/room3/greenc/VLAND/VLAND-test/VLAND_root_util /scratch1/greenc/VLAND-test_build/include /afs/fnal.gov/files/code/e898/code17/BooNE_products/prd/root/v4_00_08g/Linux-2-4-2-3-2-GCC_3_4_1--opt/include") \ \
\ \ \ \ \ \ \ \ \ \ \ \ if\ ($a[0])\ {\ $a[0]="$a[0]/$a[1]" \ \
\ \ \ \ \ \ \ \ \ \ \ \ s%(defined_in\s+)\"?([^\";]+)\"?%$1$a[0] %}} ' /afs/fnal.gov/files/home/room3/greenc/VLAND/VLAND-test/VLAND_root_util/src/PlotFile_linkdef.h.in > /scratch1/greenc/VLAND-test_build/VLAND_root_util/src/PlotFile_linkdef.h

(apologies for the inevitable mail-client wrapping).

Am I doing something obviously wrong? How can I get this to work?

Thanks,
Chris.

-- 
Chris Green, MiniBooNE / LANL. Email greenc at fnal.gov
Tel: (630) 840-2167. Fax: (630) 840-3867