cmake: Command substitution work around for VERBATIM flag.

extras/buildsystem/cmake/CMakeLists/src_CMakeLists.txt

@@ -194,10 +194,12 @@ endif(APPLE)
 # revision.c
 
 set(rev "${CMAKE_BINARY_DIR}/src/misc/revision.c")
+exec_program(dirname ARGS ${rev} OUTPUT_VARIABLE rev_dir)
+
 add_custom_command(
 OUTPUT ${rev}
 COMMAND    rm -f ${rev} ${rev}.tmp
-COMMAND    mkdir -p `dirname ${rev}`
+COMMAND    mkdir -p ${rev_dir}
 COMMAND    echo "/* AUTOGENERATED FILE - DO NOT EDIT */" > ${rev}.tmp
 COMMAND    printf "const char psz_vlc_changeset[] = \"" >> ${rev}.tmp
 COMMAND    sh -c "printf `LANG=C svnversion ${CMAKE_SOURCE_DIR} || printf \"exported\"`" >> ${rev}.tmp
@@ -212,10 +214,11 @@ set(rev)
 # No real use for this one, we just used to need it.
 # We should really remove that.
 set(builtin "${CMAKE_BINARY_DIR}/src/modules/builtin.h")
+exec_program(dirname ARGS ${builtin} OUTPUT_VARIABLE builtin_dir)
 
 add_custom_command(
 OUTPUT ${builtin}
-COMMAND    mkdir -p `dirname ${builtin}`
+COMMAND    mkdir -p ${builtin_dir}
 COMMAND    echo "/* Auto generated by ${CMAKE_CURRENT_BUILD_DIR}/CMakeLists.txt */" > ${builtin}
 COMMAND    echo "int vlc_entry__main( module_t* );" >> ${builtin}
 COMMAND    echo "#define ALLOCATE_ALL_BUILTINS() do {} while(0)" >> ${builtin}
@@ -226,11 +229,12 @@ set(should)
 ##########################################################
 # vlc_about.h
 set(about "${CMAKE_BINARY_DIR}/include/vlc_about.h")
+exec_program(dirname ARGS ${about} OUTPUT_VARIABLE about_dir)
 
 add_custom_command(
 OUTPUT ${about}
 COMMAND rm -f "${about}.tmp"
-COMMAND mkdir -p `dirname ${about}`
+COMMAND mkdir -p ${about_dir}
 COMMAND echo "/* Automatically generated file - DO NOT EDIT */" > "${about}.tmp"
 COMMAND echo "static const char psz_license[] =" >> "${about}.tmp"
 COMMAND cat ${CMAKE_SOURCE_DIR}/COPYING | sed s/\"/''/g | awk "{ print \"\\\"\"$0\"\\\\n\\\"\" }" >> "${about}.tmp"