[CMake] trouble with quotation marks (cmake 2.6 for WinCE)

[Ris Misner]

Hi,

I am new to using cmake, and trying to get a custom build command to embed quotes for a project that I'm compiling in MS visual studio on a windows machine.

I have this in my cmake file:

COMMAND ${FLEX_EXECUTABLE} -t ${WEBCORE_DIR}/css/tokenizer.flex | "${PERL_EXECUTABLE}" ${MAKE_TOKENIZER} > ${DERIVED_SOURCES_DIR}/tokenizer.cpp

I need to achieve this custom build step in my generated vcproj file:

C:\cygwin\bin\flex.exe -t E:\Wolverine\git-Jason\git-WebKit\WebCore\css\tokenizer.flex | "C:\cygwin\bin\perl.exe" E:\Wolverine\git-Jason\git-WebKit\WebCore\css\maketokenizer > E:\Wolverine\git-Jason\git-WebKit\WebKitBuild\DerivedSources\tokenizer.cpp

Please note the wrapping quotes around "C:\cygwin\bin\perl.exe".  That's critical, or the DOS shell complains that 'C:' is not a valid command.

Cmake is removing the quotes and giving me this:

C:\cygwin\bin\flex.exe -t E:\Wolverine\git-Jason\git-WebKit\WebCore\css\tokenizer.flex | C:\cygwin\bin\perl.exe E:\Wolverine\git-Jason\git-WebKit\WebCore\css\maketokenizer > E:\Wolverine\git-Jason\git-WebKit\WebKitBuild\DerivedSources\tokenizer.cpp

Which fails like I said.  DOS complains that 'C:' is not a valid command, and doesn't parse it correctly without the quotes around the path to perl.exe.

When I try to escape the quotes, like this:

COMMAND ${FLEX_EXECUTABLE} -t ${WEBCORE_DIR}/css/tokenizer.flex | \"${PERL_EXECUTABLE}\" ${MAKE_TOKENIZER} > ${DERIVED_SOURCES_DIR}/tokenizer.cpp

Cmake preserves the backslashes, and generates this:

C:\cygwin\bin\flex.exe -t E:\Wolverine\git-Jason\git-WebKit\WebCore\css\tokenizer.flex | \"C:\cygwin\bin\perl.exe\" E:\Wolverine\git-Jason\git-WebKit\WebCore\css\maketokenizer > E:\Wolverine\git-Jason\git-WebKit\WebKitBuild\DerivedSources\tokenizer.cpp


I have also tried to work around it by performing a double macro expansion like this:

SET(cmd "${FLEX_EXECUTABLE} -t ${WEBCORE_DIR}/css/tokenizer.flex | \"${PERL_EXECUTABLE}\" ${MAKE_TOKENIZER} > ${DERIVED_SOURCES_DIR}/tokenizer.cpp")
COMMAND ${cmd}

It doesn't help... I get this:

"C:\cygwin\bin\flex.exe -t E:\Wolverine\git-Jason\git-WebKit\WebCore\css\tokenizer.flex | \"C:\cygwin\bin\perl.exe\" E:\Wolverine\git-Jason\git-WebKit\WebCore\css\maketokenizer > E:\Wolverine\git-Jason\git-WebKit\WebKitBuild\DerivedSources\tokenizer.cpp"

The backslashes to escape the quotes were preserved (breaking it) and the wrapping quotes around the outside of the whole command string were also preserved, which makes the DOS shell think this is one long file name.

Whatever I try, the quotes are either completely removed, or the backslashes to escape them are preserved as \" instead of becoming a simple "

I also tried putting the quotes in their own escaped substrings like this: "\""${PERL_EXECUTABLE}"\""

COMMAND ${FLEX_EXECUTABLE} -t ${WEBCORE_DIR}/css/tokenizer.flex | "\""${PERL_EXECUTABLE}"\"" ${MAKE_TOKENIZER} > ${DERIVED_SOURCES_DIR}/tokenizer.cpp

And I was surprised to see this output:


C:\cygwin\bin\flex.exe -t E:/Wolverine/git-Jason/git-WebKit/WebCore/css/tokenizer.flex | \" C:/cygwin/bin/perl.exe\"\"\" E:/Wolverine/git-Jason/git-WebKit/WebCore/css/maketokenizer > E:/Wolverine/git-Jason/git-WebKit/WebKitBuild/DerivedSources/tokenizer.cpp


So then I tried to put just the " into its own expansion like this:

SET(QUOTE \")
COMMAND ${FLEX_EXECUTABLE} -t ${WEBCORE_DIR}/css/tokenizer.flex | ${QUOTE}${PERL_EXECUTABLE}${QUOTE} ${MAKE_TOKENIZER} > ${DERIVED_SOURCES_DIR}/tokenizer.cpp

But the backslash to escape the quote is still preserved that way too, and I get this:


C:\cygwin\bin\flex.exe -t E:/Wolverine/git-Jason/git-WebKit/WebCore/css/tokenizer.flex | \"C:/cygwin/bin/perl.exe\" E:/Wolverine/git-Jason/git-WebKit/WebCore/css/maketokenizer > E:/Wolverine/git-Jason/git-WebKit/WebKitBuild/DerivedSources/tokenizer.cpp



Is there any way to make this generate the output that I need?  Is this a bug in the version of cmake that I'm using (2.6 for windows ce) or is there a trick to the cmake syntax?


For reference details, the complete context of my custom command comes from this macro:

SET(MAKE_TOKENIZER ${WEBCORE_DIR}/css/maketokenizer)
# - Create ${DERIVED_SOURCES_DIR}/tokenizer.cpp
# GENERATE_TOKENIZER()
MACRO(GENERATE_TOKENIZER)
  # do a little dance to embed quotes around perl.exe, or cmake messes them up
  ADD_CUSTOM_COMMAND(
    OUTPUT ${DERIVED_SOURCES_DIR}/tokenizer.cpp
    DEPENDS ${WEBCORE_DIR}/css/tokenizer.flex ${MAKE_TOKENIZER}
    COMMAND ${FLEX_EXECUTABLE} -t ${WEBCORE_DIR}/css/tokenizer.flex | "${PERL_EXECUTABLE}" ${MAKE_TOKENIZER} > ${DERIVED_SOURCES_DIR}/tokenizer.cpp
    VERBATIM)
ENDMACRO()
GENERATE_TOKENIZER() # this is called out in a separate file

I am using cmake 2.6 for Windows CE because that's the version that was branched to support builds for Windows CE (so unfortunately if this is a bug that has been fixed, I can't update to cmake 2.8 - was there a work-around in cmake 2.6?)



Ris Misner
Sr. Software Engineer I
d: 1.330.864.2300 x229
m: 1.330.329.2843
email: rism at bsquare.com
www.bsquare.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.cmake.org/pipermail/cmake/attachments/20100813/803aadb8/attachment.htm>