gnu: qtbase: Add variant that fixes file name handling in CMake macros.

* gnu/packages/patches/qtbase-QTBUG-81715.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/qt.scm (qtbase-patched): New public variable.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu/local.mk

@@ -1355,6 +1355,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/qrcodegen-cpp-make-install.patch		\
   %D%/packages/patches/qt4-ldflags.patch			\
   %D%/packages/patches/qtbase-use-TZDIR.patch			\
+  %D%/packages/patches/qtbase-QTBUG-81715.patch			\
   %D%/packages/patches/qtscript-disable-tests.patch		\
   %D%/packages/patches/quagga-reproducible-build.patch          \
   %D%/packages/patches/quickswitch-fix-dmenu-check.patch	\

gnu/packages/patches/qtbase-QTBUG-81715.patch

@@ -0,0 +1,40 @@
+From 8a3fde00bf53d99e9e4853e8ab97b0e1bcf74915 Mon Sep 17 00:00:00 2001
+From: Joerg Bornemann <joerg.bornemann@qt.io>
+Date: Wed, 29 Jan 2020 11:06:35 +0100
+Subject: [PATCH] Fix qt5_make_output_file macro for paths containing dots
+
+Commit 89bd5a7e broke CMake projects that use dots in their build
+paths, because the used regular expression matches the directory part
+of the path as well.
+
+The regex wants to achieve the same as get_filename_component(...
+NAME_WLE) which is available since CMake 3.14. Re-implement the
+NAME_WLE functionality for older CMake versions by using multiple
+get_filename_component calls.
+
+Fixes: QTBUG-81715
+Task-number: QTBUG-80295
+Change-Id: I2ef053300948f6e1b2c0c5eafac35105f193d4e6
+Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
+---
+
+diff --git a/src/corelib/Qt5CoreMacros.cmake b/src/corelib/Qt5CoreMacros.cmake
+index 7735e51..b3da640 100644
+--- a/src/corelib/Qt5CoreMacros.cmake
++++ b/src/corelib/Qt5CoreMacros.cmake
+@@ -59,7 +59,14 @@
+     set(_outfile "${CMAKE_CURRENT_BINARY_DIR}/${rel}")
+     string(REPLACE ".." "__" _outfile ${_outfile})
+     get_filename_component(outpath ${_outfile} PATH)
+-    string(REGEX REPLACE "\\.[^.]*$" "" _outfile ${_outfile})
++    if(CMAKE_VERSION VERSION_LESS "3.14")
++        get_filename_component(_outfile_ext ${_outfile} EXT)
++        get_filename_component(_outfile_ext ${_outfile_ext} NAME_WE)
++        get_filename_component(_outfile ${_outfile} NAME_WE)
++        string(APPEND _outfile ${_outfile_ext})
++    else()
++        get_filename_component(_outfile ${_outfile} NAME_WLE)
++    endif()
+     file(MAKE_DIRECTORY ${outpath})
+     set(${outfile} ${outpath}/${prefix}${_outfile}.${ext})
+ endmacro()

gnu/packages/qt.scm

@@ -598,6 +598,19 @@ (define-public qtbase
 developers using C++ or QML, a CSS & JavaScript like language.")
     (license (list license:lgpl2.1 license:lgpl3))))
 
+;; This variant fixes a problem with the CMake macros shipped by qtbase.  See
+;; discussion at <https://lists.gnu.org/archive/html/guix-devel/2020-02/msg00308.html>.
+(define-public qtbase-patched
+  (let ((src (package-source qtbase)))
+    (hidden-package
+     (package
+       (inherit qtbase)
+       (source
+        (origin
+          (inherit src)
+          (patches
+           (append (search-patches "qtbase-QTBUG-81715.patch")
+                   (origin-patches src)))))))))
 
 ;; qt used to refer to the monolithic Qt 5.x package
 (define-deprecated qt qtbase)