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CMake: Fix position independent code linker flags not being set

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We set CMAKE_POSITION_INDEPENDENT_CODE to ON and require CMake 3.16.
This sets CMP0083 to NEW and should pass -fPIE to linker calls as well.

However, the PIE-enabling flag is not passed to the linker unless we
call check_pie_supported(). This behavior is documented in CMake's
CMP0083 documentation page.

[ChangeLog][CMake] Qt tools are now built with position independent code
even with Unix toolchains where this is not the default, for example
clang.

Pick-to: 6.5 6.4 6.2
Change-Id: I1d98e0ea7063a76e3fddc94d6555c6eaf14c7885
Reviewed-by: Alexey Edelev <alexey.edelev@qt.io>
This commit is contained in:
Joerg Bornemann 2023-02-22 10:47:00 +01:00
parent 78f7a8c418
commit 4183768d9b
1 changed files with 4 additions and 0 deletions
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4
cmake/QtSetup.cmake
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@ -119,6 +119,10 @@ endif()
## Position independent code:
set(CMAKE_POSITION_INDEPENDENT_CODE ON)
# Does the linker support position independent code?
include(CheckPIESupported)
check_pie_supported()
# Do not relink dependent libraries when no header has changed:
set(CMAKE_LINK_DEPENDS_NO_SHARED ON)