<div dir="ltr"><div>Thanks Eric! That worked perfectly.</div><div><br></div><div>I had looked at generator expressions yesterday, but didn't understand at which point during makefile generation they were evaluated, and had falsely assumed that they were evaluated too early. Happy to learn new tricks! :)</div><div><br></div><div>Josh</div></div><br><div class="gmail_quote"><div dir="ltr">On Thu, Mar 15, 2018 at 2:56 AM Eric Noulard <<a href="mailto:eric.noulard@gmail.com">eric.noulard@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Joshua,<div><br></div><div class="gmail_extra"><br><div class="gmail_quote"></div></div></div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">2018-03-15 4:18 GMT+01:00 Joshua Baergen <span dir="ltr"><<a href="mailto:joshuabaergen@gmail.com" target="_blank">joshuabaergen@gmail.com</a>></span>:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hello,<div><br></div><div>I'm attempting to implement link-time dependency injection. In brief, what this means is that, for a library A that depends on B, we would normally have:</div><div><br></div><div> target_link_libraries(A B)</div><div><br></div><div>However, when building unittests for A (done in a subdirectory), we instead want:</div><div><br></div><div> target_link_libraries(A MockB)</div><div><br></div><div>I've spent a bunch of time looking through CMake documentation and I'm not sure how to express this without resorting to manually specifying the link line when A is in use. Could someone give me some guidance?</div></div></blockquote><div><br></div><div><br></div></div></div></div><div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><div>Since you want link-time choice I bet you should have a look to some kind of generator expression </div><div>see doc here: <a href="https://cmake.org/cmake/help/latest/manual/cmake-generator-expressions.7.html" target="_blank">https://cmake.org/cmake/help/latest/manual/cmake-generator-expressions.7.html</a></div><div><br></div><div>genex may be used in target_link_libraries.</div><div><br></div></div>for example if you can set some property on (all) your unit test target</div><div class="gmail_extra">(I personnally do that globally by defining my own mytest_add_executable macro)</div><div class="gmail_extra"><br></div><div class="gmail_extra">set_target_properties(<YourTestTarget> PROPERTIES <span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">UNITTEST 1)</span></div><div class="gmail_extra"><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"><br></span></div><div class="gmail_extra">then may be you can use some genex which check whether an executable if a unitest:</div><div class="gmail_extra"><br></div><div class="gmail_extra">set(GenEx_IsTest $<STREQUAL:$<TARGET_PROPERTY:<span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline">UNITTEST</span>>,1>)<br clear="all"><div><br></div><div>and then use some other genex using the previous one in target_link_libraries</div><div><br></div><div>like here for automatic instantiation of source:</div><div><a href="https://cmake.org/pipermail/cmake/2015-January/059669.html" target="_blank">https://cmake.org/pipermail/cmake/2015-January/059669.html</a><br class="m_1479142077188366366gmail-Apple-interchange-newline"><br></div><div>I lack time to craft the complete example but I think it's doable with genex.</div><div><br></div><div>It seems that others already played along this line:</div><div><a href="https://developer.blender.org/T46725" target="_blank">https://developer.blender.org/T46725</a><br></div></div></div><div dir="ltr"><div class="gmail_extra"><div><br></div>-- <br><div class="m_1479142077188366366gmail_signature"><div dir="ltr"><div><div dir="ltr"><div>Eric<br></div></div></div></div></div>
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