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<p class=MsoNormal style='margin-left:36.0pt'><b><span lang=EN-US
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> David
Cole [mailto:david.cole@kitware.com] <br>
<b>Sent:</b> 27 June 2010 16:39<br>
<b>To:</b> Hicham Mouline<br>
<b>Cc:</b> cmake@cmake.org<br>
<b>Subject:</b> Re: [CMake] maximum length of a list<o:p></o:p></span></p>
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<p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:36.0pt'>On Sun, Jun 27, 2010 at 11:05 AM,
Hicham Mouline <<a href="mailto:hicham@mouline.org">hicham@mouline.org</a>>
wrote:<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'>hello<br>
<br>
I assign the list of all directories the names of which starts with a<br>
pattern like pattern_.... to a cmake variable which I then pass as a<br>
preprocessor macro:<br>
<br>
FILE(GLOB MYPROJECT_LIST_SYSTEMS RELATIVE ${CMAKE_SOURCE_DIR} system_*)<br>
<br>
MYPROJECT_LIST_SYSTEMS is then a cmake "list", a string with
semicolon<br>
separators.<br>
<br>
What is the maximum number of entries in the list that cmake handles?<br>
Or what is the maximum length of a cmake string?<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'>In theory, it should be around 2G
for 32-bit build of CMake.<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'>In practice, I bet you'll run
into the beginnings of performance issues if you start to have strings that are
10s or 100s of megabytes large.<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'>There's no hard-coded or
stack-based limits in CMake that I'm aware of -- it should be simply based on
how much memory CMake can allocate... so: hopefully, larger than anything you
can throw at it... :-)<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'><o:p> </o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'>HTH,<o:p></o:p></p>
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<p class=MsoNormal style='margin-left:36.0pt'>David<o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='color:#1F497D'>That's totally all right then. I
will probably never have more than 100 directories, ie a string of 100 max
20char length strings separated by semi colon.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>By the way, if I wish to replace the ; in the string by a ,
(comma)<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>should I just use STRING(REPLACE ";" "," ...
) ?<o:p></o:p></span></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><o:p> </o:p></p>
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