<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:rtc="http://microsoft.com/officenet/conferencing" xmlns:D="DAV:" xmlns:Repl="http://schemas.microsoft.com/repl/" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ppda="http://www.passport.com/NameSpace.xsd" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40">
<head>
<meta http-equiv=Content-Type content="text/html; charset=us-ascii">
<meta name=Generator content="Microsoft Word 12 (filtered medium)">
<style>
<!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri","sans-serif";
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page Section1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.Section1
{page:Section1;}
-->
</style>
<!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=EN-US link=blue vlink=purple>
<div class=Section1>
<p class=MsoNormal>Hi Everyone,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>I’m currently having a problem with generated headers
in a Visual Studio 2005/2008 project generated with CMake. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Visual Studio is regenerating the headers even when nothing
has changed.<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>The project requires headers generated by a tool called ‘tracewpp’,
which is part of the Windows DDK. In short, it generates a header from a given
C/CPP source file and the header is included in the original source file. I don’t
know if this is important but it appears to me that this is a circular
dependency.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>For example, in ‘foo.cpp’, there will be an
include directive that says:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>#include <foo.cpp.tmh><o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>and I have written CMake code to generate ‘foo.cpp.tmh’:<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>---8<---------------Wpp.cmake------<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>function ( tracewpp OUTPUT_VAR INI OUTPUT_DIR SOURCE )<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> #
[mlr] list of .tmh files to be generated -> TMH<o:p></o:p></p>
<p class=MsoNormal> get_filename_component
( FILEN ${SOURCE} NAME )<o:p></o:p></p>
<p class=MsoNormal> set
( TMH_FILEN ${FILEN}.tmh )<o:p></o:p></p>
<p class=MsoNormal> set
( TMH ${CMAKE_CURRENT_BINARY_DIR}/${TMH_FILEN} )<o:p></o:p></p>
<p class=MsoNormal> set
( EXTENSIONS ".h.H.c.C.hpp.HPP.cpp.CPP" )<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> #
[mlr] cmake only converts the command name to the native path format. the<o:p></o:p></p>
<p class=MsoNormal> #
path names to be used in arguments must be converted manually.<o:p></o:p></p>
<p class=MsoNormal> file
( TO_NATIVE_PATH ${SOURCE} NATIVE_SOURCE )<o:p></o:p></p>
<p class=MsoNormal> file
( TO_NATIVE_PATH ${WPP_DIR} NATIVE_WPP_DIR )<o:p></o:p></p>
<p class=MsoNormal> file
( TO_NATIVE_PATH ${INI} NATIVE_INI )<o:p></o:p></p>
<p class=MsoNormal> file
( TO_NATIVE_PATH ${OUTPUT_DIR} NATIVE_OUTPUT_DIR )<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> #
[mlr] note that if -preserveext: occurs after the source file specification, it
has<o:p></o:p></p>
<p class=MsoNormal> #
no effect.<o:p></o:p></p>
<p class=MsoNormal> add_custom_command(<o:p></o:p></p>
<p class=MsoNormal> OUTPUT
${TMH}<o:p></o:p></p>
<p class=MsoNormal> COMMAND<o:p></o:p></p>
<p class=MsoNormal> ${WPP_DIR}/bin/tracewpp.exe
-ext:${EXTENSIONS} -preserveext:${EXTENSIONS} -cfgdir:${NATIVE_WPP_DIR}
-ini:${NATIVE_INI} -odir:${NATIVE_OUTPUT_DIR} ${NATIVE_SOURCE} <o:p></o:p></p>
<p class=MsoNormal> DEPENDS
${SOURCE}<o:p></o:p></p>
<p class=MsoNormal> )<o:p></o:p></p>
<p class=MsoNormal> #
[mlr] export the value of TMH into OUTPUT_VAR.<o:p></o:p></p>
<p class=MsoNormal> set
( ${OUTPUT_VAR} ${TMH} PARENT_SCOPE )<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>endfunction ()<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal># [mlr] TODO: INI should be an optional argument.<o:p></o:p></p>
<p class=MsoNormal>function ( wpp OUTPUT_VAR INI OUTPUT_DIR SOURCES )<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal> #
[mlr] invoke tracewpp() for each source file, adding the resulting file to a
list <o:p></o:p></p>
<p class=MsoNormal> #
named TMH.<o:p></o:p></p>
<p class=MsoNormal> foreach
( I ${SOURCES} )<o:p></o:p></p>
<p class=MsoNormal> tracewpp
( J ${INI} ${OUTPUT_DIR} ${I} )<o:p></o:p></p>
<p class=MsoNormal> list
( APPEND TMH ${J} )<o:p></o:p></p>
<p class=MsoNormal> endforeach
()<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> source_group(
"WPP Files (generated)" REGULAR_EXPRESSION ".+\\.tmh$" )<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal> #
[mlr] export the value of TMH into OUTPUT_VAR.<o:p></o:p></p>
<p class=MsoNormal> set
( ${OUTPUT_VAR} ${TMH} PARENT_SCOPE )<o:p></o:p></p>
<p class=MsoNormal> <o:p></o:p></p>
<p class=MsoNormal>endfunction ()<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>---8<---------------Wpp.cmake------<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The list created by wpp() is added to the source file
listing that’s passed into add_library() in CMakeList.txt files elsewhere,
as described in the CMake FAQ.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The result is that Visual Studio will regenerate ‘foo.cpp.tmh’
regardless of whether ‘foo.cpp’ has been modified or not. This has
the effect of producing a full rebuild since all files in the project are
integrated with ‘tracewpp’.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Is there something I’m doing wrong? What can I do to
prevent full rebuilds when they’re unnecessary?<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Thanks,<o:p></o:p></p>
<p class=MsoNormal>Mike<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
</div>
</body>
</html>