#44917: Qt: -fPIC & -fPIE conflict
Open Date: 2022-06-23 15:33
Last Update: 2022-06-25 11:09
URL for this Ticket:
https://osdn.net//projects/freeciv/ticket/44917
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Last Changes/Comment on this Ticket:
2022-06-25 11:09 Updated by: cazfi
Comment:
Reply To cazfi
Clang doesn't like this:
clang: error: argument unused during compilation: '-no-pie' [-Werror,-Wunused-command-line-argument!]
That configure check runs without "-Werror" even on --enable-debug, while the actual compilation has "-Werror"
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Ticket Status:
Reporter: cazfi
Owner: cazfi
Type: Bugs
Status: Open [Owner assigned]
Priority: 5 - Medium
MileStone: 3.0.3
Component: Bootstrap
Severity: 5 - Medium
Resolution: None
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Ticket details:
I looked at the debian freeciv package build failure at x32: https://buildd.debian.org/status/logs.php?pkg=freeciv&ver=2.6.6-1
The problem seems to be that Qt headers there both require pic, and disallow pie. Freeciv m4/qt5.m4 correctly detects the need to add -fPIC. I think -fPIE comes from debian build hardening.
I got the build go through all right by adding logic to qt5.m4 to try to disable pie in cases where it adds pic (but in such a way that there should be no regression for any builds that require pic, but cannot disable pie for some reason)
I'll attach the patch I used in that testing (for S2_6, but likely applies to S3_0 as is - likely not to later branches with qt6 support)
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