gnu: qtbase: Fix build with glibc >= 2.28.

* gnu/packages/patches/qtbase-glibc-compat.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/qt.scm (qtbase)[source](patches): Use it.
[arguments]: Remove "--no-feature-renameat2" from #:configure-flags.

gnu/local.mk

@@ -1097,6 +1097,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/python-waitress-fix-tests.patch		\
   %D%/packages/patches/qemu-glibc-2.27.patch 			\
   %D%/packages/patches/qt4-ldflags.patch			\
+  %D%/packages/patches/qtbase-glibc-compat.patch		\
   %D%/packages/patches/qtbase-use-TZDIR.patch			\
   %D%/packages/patches/qtscript-disable-tests.patch		\
   %D%/packages/patches/quagga-reproducible-build.patch          \

gnu/packages/patches/qtbase-glibc-compat.patch

@@ -0,0 +1,50 @@
+Fix qmake build with glibc 2.28.
+
+Taken from upstream:
+https://code.qt.io/cgit/qt/qtbase.git/commit/?id=25feee4e061b99edab79503d81f5bd045c6c8e3d
+
+diff --git a/src/corelib/global/qconfig-bootstrapped.h b/src/corelib/global/qconfig-bootstrapped.h
+index 3469ebe5e6..c5585ea32a 100644
+--- a/src/corelib/global/qconfig-bootstrapped.h
++++ b/src/corelib/global/qconfig-bootstrapped.h
+@@ -98,10 +98,18 @@
+ #define QT_NO_QOBJECT
+ #define QT_FEATURE_process -1
+ #define QT_FEATURE_regularexpression -1
+-#define QT_FEATURE_renameat2 -1
++#ifdef __GLIBC_PREREQ
++# define QT_FEATURE_renameat2 (__GLIBC_PREREQ(2, 28) ? 1 : -1)
++#else
++# define QT_FEATURE_renameat2 -1
++#endif
+ #define QT_FEATURE_sharedmemory -1
+ #define QT_FEATURE_slog2 -1
+-#define QT_FEATURE_statx -1
++#ifdef __GLIBC_PREREQ
++# define QT_FEATURE_statx (__GLIBC_PREREQ(2, 28) ? 1 : -1)
++#else
++# define QT_FEATURE_statx -1
++#endif
+ #define QT_FEATURE_syslog -1
+ #define QT_NO_SYSTEMLOCALE
+ #define QT_FEATURE_systemsemaphore -1
+diff --git a/src/corelib/io/qfilesystemengine_unix.cpp b/src/corelib/io/qfilesystemengine_unix.cpp
+index 0c9cdb8667..deb4a9f220 100644
+--- a/src/corelib/io/qfilesystemengine_unix.cpp
++++ b/src/corelib/io/qfilesystemengine_unix.cpp
+@@ -91,7 +91,6 @@ extern "C" NSString *NSTemporaryDirectory();
+ #  include <sys/syscall.h>
+ #  include <sys/sendfile.h>
+ #  include <linux/fs.h>
+-#  include <linux/stat.h>
+ 
+ // in case linux/fs.h is too old and doesn't define it:
+ #ifndef FICLONE
+@@ -112,6 +111,7 @@ static int renameat2(int oldfd, const char *oldpath, int newfd, const char *newp
+ #    endif
+ 
+ #    if !QT_CONFIG(statx) && defined(SYS_statx)
++#      include <linux/stat.h>
+ static int statx(int dirfd, const char *pathname, int flag, unsigned mask, struct statx *statxbuf)
+ { return syscall(SYS_statx, dirfd, pathname, flag, mask, statxbuf); }
+ #    elif !QT_CONFIG(statx) && !defined(SYS_statx)

gnu/packages/qt.scm

@@ -494,7 +494,8 @@ system, and the core design of Django is reused in Grantlee.")
               (base32
                "0ipv18ypbgpxhh49rfplqmflskmnhhwj1bjr5hrwi0jpvar4gl50"))
              ;; Use TZDIR to avoid depending on package "tzdata".
-             (patches (search-patches "qtbase-use-TZDIR.patch"))
+             (patches (search-patches "qtbase-use-TZDIR.patch"
+                                      "qtbase-glibc-compat.patch"))
              (modules '((guix build utils)))
              (snippet
                ;; corelib uses bundled harfbuzz, md4, md5, sha3
@@ -608,7 +609,6 @@ system, and the core design of Django is reused in Grantlee.")
                  ;; kernels that the glibc supports, including the RHEL6
                  ;; (2.6.32) and RHEL7 (3.10) kernels.
                  "-no-feature-getentropy"  ; requires Linux 3.17
-                 "-no-feature-renameat2"   ; requires Linux 3.16
 
                  ;; Do not build examples; if desired, these could go
                  ;; into a separate output, but for the time being, we