cmake: Avoid hardcoding Qt's major version in Find module / variable names #31010

hebasto commented at 12:45 PM on October 1, 2024: member

This PR facilitates future migration to Qt 6 and is a prerequisite for #30997.

No behaviour change.

cmake: Avoid hardcoding Qt's major version in Find module

This change facilitates future migration to Qt 6.

deacf3c7cd

hebasto added the label Build system on Oct 1, 2024

DrahtBot commented at 12:45 PM on October 1, 2024: contributor

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#30997 (build: Switch to Qt 6 by hebasto)

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maflcko added the label DrahtBot Guix build requested on Oct 1, 2024

DrahtBot commented at 7:31 PM on October 1, 2024: contributor

Guix builds (on x86_64) [untrusted test-only build, possibly unsafe, not for production use]

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DrahtBot removed the label DrahtBot Guix build requested on Oct 1, 2024

hebasto added the label Refactoring on Oct 2, 2024

in CMakeLists.txt:180 in deacf3c7cd

 176 | @@ -177,7 +177,7 @@ if(BUILD_GUI)
 177 |    if(BUILD_GUI_TESTS)
 178 |      list(APPEND qt_components Test)
 179 |    endif()
 180 | -  find_package(Qt5 5.11.3 MODULE REQUIRED
 181 | +  find_package(Qt 5.11.3 MODULE REQUIRED

l0rinc commented at 2:12 PM on October 2, 2024:

It seems to me we're still hardcoding the major version - can't we change this during migration instead?

hebasto commented at 2:17 PM on October 2, 2024:

It seems to me we're still hardcoding the major version

I meant the variable names. The full minimum required version was not supposed to change.

can't we change this during migration instead?

It is done in #30997. This PR split from it to make the #30997 easier to review.

hebasto renamed this:
~~cmake: Avoid hardcoding Qt's major version in Find module~~
cmake: Avoid hardcoding Qt's major version in Find module / variable names
on Oct 2, 2024

in cmake/module/FindQt.cmake:61 in deacf3c7cd

  55 | @@ -56,11 +56,11 @@ else()
  56 |  endif()
  57 |  
  58 |  include(FindPackageHandleStandardArgs)
  59 | -find_package_handle_standard_args(Qt5
  60 | -  REQUIRED_VARS Qt5_DIR
  61 | -  VERSION_VAR Qt5_VERSION
  62 | +find_package_handle_standard_args(Qt
  63 | +  REQUIRED_VARS Qt${Qt_FIND_VERSION_MAJOR}_DIR
  64 | +  VERSION_VAR Qt${Qt_FIND_VERSION_MAJOR}_VERSION

l0rinc commented at 5:29 PM on October 2, 2024:

Do we need to keep the version variables here?

hebasto commented at 6:11 PM on October 2, 2024:

It logs the actual Qt version in the output:

-- Found Qt: /usr/lib/x86_64-linux-gnu/cmake/Qt5 (found suitable version "5.15.13", minimum required is "5.11.3")

Otherwise, the output will be less informative:

-- Found Qt: /usr/lib/x86_64-linux-gnu/cmake/Qt5 (Required is at least version "5.11.3")

in cmake/module/FindQt.cmake:44 in deacf3c7cd

  39 | @@ -40,10 +40,10 @@ endif()
  40 |  # /usr/x86_64-w64-mingw32/lib/libm.a or /usr/arm-linux-gnueabihf/lib/libm.a.
  41 |  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY BOTH)
  42 |  
  43 | -find_package(Qt5 ${Qt5_FIND_VERSION}
  44 | -  COMPONENTS ${Qt5_FIND_COMPONENTS}
  45 | +find_package(Qt${Qt_FIND_VERSION_MAJOR} ${Qt_FIND_VERSION}
  46 | +  COMPONENTS ${Qt_FIND_COMPONENTS}

l0rinc commented at 5:29 PM on October 2, 2024:

nit: is there a reason for keeping the t lowercase? Looks weird this way...

hebasto commented at 6:06 PM on October 2, 2024:

Variables such as <PackageName>_FIND_VERSION, <PackageName>_FIND_VERSION_MAJOR, and <PackageName>_FIND_COMPONENTS, are part of the Find<PackageName> module interface. In our case, <PackageName> is replaced with Qt.

l0rinc commented at 6:14 PM on October 2, 2024:

Wow, so much magic

l0rinc commented at 5:29 PM on October 2, 2024: contributor

Concept ACK

l0rinc commented at 6:13 PM on October 2, 2024: contributor

utACK deacf3c7cd68dd4ee973526740e45c7015b6433a

laanwj commented at 10:19 AM on October 3, 2024: member

Seems fine with me, we could update the Qt5 to Qt6 as well, but i imagine removing the version number saves us work when we move to Qt7 in the future 😄

promag commented at 10:28 AM on October 4, 2024: contributor

Code review ACK deacf3c7cd68dd4ee973526740e45c7015b6433a.

maflcko commented at 7:46 AM on October 7, 2024: member

lgtm ACK deacf3c7cd68dd4ee973526740e45c7015b6433a

fanquake merged this on Oct 7, 2024

fanquake closed this on Oct 7, 2024

TheCharlatan referenced this in commit 8bb47d4c2c on Nov 2, 2024

bug-castercv502 referenced this in commit 403bebd591 on Sep 28, 2025

bitcoin locked this on Oct 7, 2025