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I'm on Ubuntu 18.04 and seeing the extra -fPIC flag added by Qt 5.9.5, as reported in #1753 #1813. Upgrading to cmake 3.26 does not help. I think that it's safer to remove the flag regardless of the Qt version.

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Are you stuck with 18.04? I was planning to not support 18.04 going forward, as its outdated default compiler/packages hold development back due to lack of C++14, etc.

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Nope I indeed need to update very soon... But I don't think that this issue is specific to Ubuntu 18.04.

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I would rather add the 5.9.5 version explicitly, as it does appear to be fixed for the Qt version under 20.04 and 22.04. It sounds a little dangerous to mess with the default flags across all versions.

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Looked at the cmake bug again and also the special casing here. I think we can go ahead as proposed by you. Apologies , didn't have time to look with necessary detail yesterday. Thanks.

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