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<div class="moz-cite-prefix">On 05.03.2015 18:50, Pere Mato Vila
wrote:<br>
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<blockquote cite="mid:85F4BE57-2CB0-442A-B645-AE26CD094F67@cern.ch"
type="cite">
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<div class="">On 04 Mar 2015, at 19:40, Nils Gladitz <<a
moz-do-not-send="true" href="mailto:nilsgladitz@gmail.com"
class="">nilsgladitz@gmail.com</a>> wrote:</div>
<br class="Apple-interchange-newline">
<div class=""><span style="font-family: Helvetica; font-size:
12px; font-style: normal; font-variant: normal;
font-weight: normal; letter-spacing: normal; line-height:
normal; orphans: auto; text-align: start; text-indent:
0px; text-transform: none; white-space: normal; widows:
auto; word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255); float: none;
display: inline !important;" class="">cmake_minimum_required()
resets all policies according to the given version.</span><br
style="font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
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text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255);" class="">
<br style="font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255);" class="">
<span style="font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255); float: none;
display: inline !important;" class="">CMP0005 was
introduced in 2.6.0 so requiring 2.8.8 sets it to NEW.</span><br
style="font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255);" class="">
<span style="font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255); float: none;
display: inline !important;" class="">CMP0054 was
introduced in 3.1 so requiring 2.8.8 clears the policy
(since it did not exist in 2.8.8).</span><br
style="font-family: Helvetica; font-size: 12px;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: auto; text-align: start; text-indent: 0px;
text-transform: none; white-space: normal; widows: auto;
word-spacing: 0px; -webkit-text-stroke-width: 0px;
background-color: rgb(255, 255, 255);" class="">
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Thanks very much for the explanation. Nevertheless I do not
understand the logic. Running with 3.1 with the exactly the same
code generates warnings that were not there in 2.8.8. In order to
switch them off I need to set the policy to NEW, which gets
cleared by requiring somehow a less restrictive condition.
</blockquote>
<br>
Setting individual policies before a call to
cmake_minimum_required() doesn't make sense given that it resets
them all but you can set them after.<br>
<br>
The warnings are there so you as a developer of a project that
conforms to CMake 2.8.8 know that the behavior will change as soon
as you convert your project to 3.1.<br>
You can get rid of the warnings by working around the if() ambiguity
so that behavior before and after CMake 3.1 is identical or by
requiring 3.1.<br>
<br>
If you do switch to requiring 3.1 make sure the new behavior works
for you.<br>
<br>
Nils<br>
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