sys-block/gparted: fix build with musl-1.2.3

Closes: https://bugs.gentoo.org/838466
Signed-off-by: Sam James <sam@gentoo.org>

3 files changed, 60 insertions, 1 deletions

diff --git a/sys-block/gparted/files/gparted-1.3.1-musl-nullptr.patch b/sys-block/gparted/files/gparted-1.3.1-musl-nullptr.patch
new file mode 100644
index 000000000000..2a4f648db609
--- /dev/null
+++ b/sys-block/gparted/files/gparted-1.3.1-musl-nullptr.patch
@@ -0,0 +1,51 @@
+https://gitlab.gnome.org/GNOME/gparted/-/commit/3d4b1c1e7b33f229efd254fb0cc06660af627ea0
+https://bugs.gentoo.org/838466
+
+From: Dominika Liberda <ja@sdomi.pl>
+Date: Sun, 10 Apr 2022 21:09:56 +0200
+Subject: [PATCH] Fix NULL == 0 assumption in call to ped_partition_flag_next()
+ (!100)
+
+GParted fails to build on Alpine Linux Edge (development tree for the
+next release) like this:
+
+    GParted_Core.cc: In constructor 'GParted::GParted_Core::GParted_Core()':
+    GParted_Core.cc:75:64: error: invalid 'static_cast' from type 'std::nullptr_t' to type 'PedPartitionFlag'
+       75 |     for ( PedPartitionFlag flag = ped_partition_flag_next( static_cast<PedPartitionFlag>( NULL ) ) ;
+          |                                                            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+The code is failing to compile now because musl libc 1.2.3 has became
+more C++11 strict [1][2] by defining NULL [3] as nullptr [4] rather than
+as 0.  The parameter to ped_partition_flag_next() [5] should always have
+been numeral 0 cast to an enumeration and never the NULL pointer.
+
+Fixes this commit [6] from 2004-12-27 which changed the parameter from 0
+to NULL.
+
+[1] define NULL as nullptr when used in C++11 or later
+    https://git.musl-libc.org/cgit/musl/commit?id=98e688a9da5e7b2925dda17a2d6820dddf1fb28
+[2] NULL vs nullptr (Why was it replaced?) [duplicate]
+    https://stackoverflow.com/questions/20509734/null-vs-nullptr-why-was-it-replaced
+[3] C++ reference, NULL
+    https://en.cppreference.com/w/cpp/types/NULL
+[4] C++ reference, nullptr
+    https://en.cppreference.com/w/cpp/language/nullptr
+[5] libparted Documentation, ped_partition_flag_next()
+    https://www.gnu.org/software/parted/api/group__PedPartition.html#g0ce9ce4247b320011bc8e9d957c8cdbb
+[6] Added cylsize to Device and made Operation contain a Device instead
+    commit 174f0cff77c5799a713954a22b2c54306d03036c
+
+Closes !100 - Fix NULL == 0 assumption in call to
+              ped_partition_flag_next()
+--- a/src/GParted_Core.cc
++++ b/src/GParted_Core.cc
+@@ -72,7 +72,7 @@ GParted_Core::GParted_Core()
+ 	ped_exception_set_handler( ped_exception_handler ) ; 
+ 
+ 	//get valid flags ...
+-	for ( PedPartitionFlag flag = ped_partition_flag_next( static_cast<PedPartitionFlag>( NULL ) ) ;
++	for ( PedPartitionFlag flag = ped_partition_flag_next( static_cast<PedPartitionFlag>( 0 ) ) ;
+ 	      flag ;
+ 	      flag = ped_partition_flag_next( flag ) )
+ 		flags .push_back( flag ) ;
+GitLab
diff --git a/sys-block/gparted/gparted-1.3.1.ebuild b/sys-block/gparted/gparted-1.3.1.ebuild
index 1368424f32cc..1119005c1bb3 100644
--- a/sys-block/gparted/gparted-1.3.1.ebuild
+++ b/sys-block/gparted/gparted-1.3.1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -35,6 +35,10 @@ BDEPEND="
 	virtual/pkgconfig
 "
 
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.3.1-musl-nullptr.patch
+)
+
 src_configure() {
 	gnome2_src_configure \
 		--enable-doc \
diff --git a/sys-block/gparted/gparted-1.4.0.ebuild b/sys-block/gparted/gparted-1.4.0.ebuild
index 1a1cd973c18d..a209f0a714db 100644
--- a/sys-block/gparted/gparted-1.4.0.ebuild
+++ b/sys-block/gparted/gparted-1.4.0.ebuild
@@ -35,6 +35,10 @@ BDEPEND="
 	virtual/pkgconfig
 "
 
+PATCHES=(
+	"${FILESDIR}"/${PN}-1.3.1-musl-nullptr.patch
+)
+
 src_configure() {
 	gnome2_src_configure \
 		--enable-doc \