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Qt4Macros: Make QT4_CREATE_MOC_COMMAND a function 

QT4_CREATE_MOC_COMMAND is given a moc_flags argument that contains the
COMPILE_DEFINITIONS and a potentially large list of include directories.
Since it is a macro, the ${moc_flags} reference is replaced with this
content and sent through cmMakefile::ExpandVariablesInString (EVIS).
Since commit v3.0.0-rc1~138^2 (Qt4: Use generator expression in
COMPILE_DEFINITIONS, 2014-01-13) the COMPILE_DEFINITIONS value contains
a '$' so the EVIS fast-path is no longer used.  Instead the full
cmCommandArgumentParserHelper is now used on the large input, which is
very slow (since it was originally created for hand-written code).

Change QT4_CREATE_MOC_COMMAND to a function instead of a macro to avoid
passing large content through EVIS.  This makes it significantly faster.
This commit is contained in:
Robert Maynard 2014-04-03 11:27:58 -04:00 committed by Brad King
parent a48de7d850
commit 7beba98652
1 changed files with 2 additions and 2 deletions
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4
Modules/Qt4Macros.cmake
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@ -103,7 +103,7 @@ endmacro()
# helper macro to set up a moc rule
macro (QT4_CREATE_MOC_COMMAND infile outfile moc_flags moc_options moc_target)
function (QT4_CREATE_MOC_COMMAND infile outfile moc_flags moc_options moc_target)
# For Windows, create a parameters file to work around command line length limit
# Pass the parameters in a file. Set the working directory to
# be that containing the parameters file and reference it by
@ -144,7 +144,7 @@ macro (QT4_CREATE_MOC_COMMAND infile outfile moc_flags moc_options moc_target)
DEPENDS ${infile}
${_moc_working_dir}
VERBATIM)
endmacro ()
endfunction ()
macro (QT4_GENERATE_MOC infile outfile )