dev-lang/python: add valgrind support

When the valgrind useflag is enabled, Python performs a runtime check if
it is run in the Valgrind VM, and adjusts its memory allocator to not
use pymalloc. Valgrind then does a much better job in tracking the
memory reachability.

Closes: https://bugs.gentoo.org/610816
Signed-off-by: Jonas Jelten <jj@sft.lol>
Closes: https://github.com/gentoo/gentoo/pull/11012
Signed-off-by: Michał Górny <mgorny@gentoo.org>

7 files changed, 26 insertions, 6 deletions

diff --git a/dev-lang/python/metadata.xml b/dev-lang/python/metadata.xml
index c123a9ef4e61..648562ff2106 100644
--- a/dev-lang/python/metadata.xml
+++ b/dev-lang/python/metadata.xml
@@ -24,6 +24,11 @@
 		<flag name="lto">
 			Optimize the build using Link Time Optimization (LTO)
 		</flag>
+		<flag name="valgrind">
+			Disable pymalloc when running under
+			<pkg>dev-util/valgrind</pkg> is detected (may incur minor
+			performance penalty even when valgrind is not used)
+		</flag>
 		<flag name="wininst">
 			Install Windows executables required to create an executable
 			installer for MS Windows
diff --git a/dev-lang/python/python-2.7.18_p16.ebuild b/dev-lang/python/python-2.7.18_p16.ebuild
index 051f660f8f9b..ee49cd0dfcda 100644
--- a/dev-lang/python/python-2.7.18_p16.ebuild
+++ b/dev-lang/python/python-2.7.18_p16.ebuild
@@ -30,8 +30,9 @@ SLOT="${PYVER}"
 KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86"
 IUSE="
 	berkdb bluetooth build examples gdbm hardened +ncurses +readline
-	+sqlite +ssl tk wininst +xml
+	+sqlite +ssl tk valgrind wininst +xml
 "
+RESTRICT="test"
 
 # Do not add a dependency on dev-lang/python to this ebuild.
 # If you need to apply a patch which requires python for bootstrapping, please
@@ -65,6 +66,7 @@ RDEPEND="
 DEPEND="
 	${RDEPEND}
 	bluetooth? ( net-wireless/bluez )
+	valgrind? ( dev-util/valgrind )
 "
 BDEPEND="
 	virtual/awk
@@ -196,6 +198,8 @@ src_configure() {
 		--without-ensurepip
 		--with-system-expat
 		--with-system-ffi
+
+		$(use_with valgrind)
 	)
 
 	# disable implicit optimization/debugging flags
diff --git a/dev-lang/python/python-3.10.8_p3.ebuild b/dev-lang/python/python-3.10.8_p3.ebuild
index f7df03edfe54..ca2055bc531c 100644
--- a/dev-lang/python/python-3.10.8_p3.ebuild
+++ b/dev-lang/python/python-3.10.8_p3.ebuild
@@ -31,7 +31,7 @@ SLOT="${PYVER}"
 KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86"
 IUSE="
 	bluetooth build +ensurepip examples gdbm hardened libedit lto
-	+ncurses pgo +readline +sqlite +ssl test tk +xml
+	+ncurses pgo +readline +sqlite +ssl test tk valgrind +xml
 "
 RESTRICT="!test? ( test )"
 
@@ -71,6 +71,7 @@ RDEPEND="
 DEPEND="
 	${RDEPEND}
 	bluetooth? ( net-wireless/bluez )
+	valgrind? ( dev-util/valgrind )
 	test? ( app-arch/xz-utils[extra-filters(+)] )
 "
 # autoconf-archive needed to eautoreconf
@@ -222,6 +223,7 @@ src_configure() {
 		$(use_with lto)
 		$(use_enable pgo optimizations)
 		$(use_with readline readline "$(usex libedit editline readline)")
+		$(use_with valgrind)
 	)
 
 	# disable implicit optimization/debugging flags
diff --git a/dev-lang/python/python-3.11.0_p2.ebuild b/dev-lang/python/python-3.11.0_p2.ebuild
index 34cae611b846..eedf9c768a85 100644
--- a/dev-lang/python/python-3.11.0_p2.ebuild
+++ b/dev-lang/python/python-3.11.0_p2.ebuild
@@ -31,7 +31,7 @@ SLOT="${PYVER}"
 KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86"
 IUSE="
 	bluetooth build +ensurepip examples gdbm hardened libedit lto
-	+ncurses pgo +readline +sqlite +ssl test tk
+	+ncurses pgo +readline +sqlite +ssl test tk valgrind
 "
 RESTRICT="!test? ( test )"
 
@@ -72,6 +72,7 @@ DEPEND="
 	${RDEPEND}
 	bluetooth? ( net-wireless/bluez )
 	test? ( app-arch/xz-utils[extra-filters(+)] )
+	valgrind? ( dev-util/valgrind )
 "
 # autoconf-archive needed to eautoreconf
 BDEPEND="
@@ -211,6 +212,7 @@ src_configure() {
 		$(use_with lto)
 		$(use_enable pgo optimizations)
 		$(use_with readline readline "$(usex libedit editline readline)")
+		$(use_with valgrind)
 	)
 
 	# disable implicit optimization/debugging flags
diff --git a/dev-lang/python/python-3.12.0_alpha2.ebuild b/dev-lang/python/python-3.12.0_alpha2.ebuild
index e10b1c493b27..9d0d10adab0b 100644
--- a/dev-lang/python/python-3.12.0_alpha2.ebuild
+++ b/dev-lang/python/python-3.12.0_alpha2.ebuild
@@ -31,7 +31,7 @@ SLOT="${PYVER}"
 KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~loong ~m68k ~mips ~ppc ~ppc64 ~riscv ~s390 ~sparc ~x86"
 IUSE="
 	bluetooth build +ensurepip examples gdbm hardened libedit lto
-	+ncurses pgo +readline +sqlite +ssl test tk
+	+ncurses pgo +readline +sqlite +ssl test tk valgrind
 "
 RESTRICT="!test? ( test )"
 
@@ -72,6 +72,7 @@ DEPEND="
 	${RDEPEND}
 	bluetooth? ( net-wireless/bluez )
 	test? ( app-arch/xz-utils[extra-filters(+)] )
+	valgrind? ( dev-util/valgrind )
 "
 # autoconf-archive needed to eautoreconf
 BDEPEND="
@@ -207,6 +208,7 @@ src_configure() {
 		$(use_with lto)
 		$(use_enable pgo optimizations)
 		$(use_with readline readline "$(usex libedit editline readline)")
+		$(use_with valgrind)
 	)
 
 	# disable implicit optimization/debugging flags
diff --git a/dev-lang/python/python-3.8.15_p3.ebuild b/dev-lang/python/python-3.8.15_p3.ebuild
index d2a1816f893b..1c522eb3b332 100644
--- a/dev-lang/python/python-3.8.15_p3.ebuild
+++ b/dev-lang/python/python-3.8.15_p3.ebuild
@@ -31,7 +31,7 @@ SLOT="${PYVER}"
 KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86"
 IUSE="
 	bluetooth build +ensurepip examples gdbm hardened lto +ncurses pgo
-	+readline +sqlite +ssl test tk wininst +xml
+	+readline +sqlite +ssl test tk valgrind wininst +xml
 "
 RESTRICT="!test? ( test )"
 
@@ -68,6 +68,7 @@ DEPEND="
 	${RDEPEND}
 	bluetooth? ( net-wireless/bluez )
 	test? ( app-arch/xz-utils[extra-filters(+)] )
+	valgrind? ( dev-util/valgrind )
 "
 # autoconf-archive needed to eautoreconf
 BDEPEND="
@@ -175,6 +176,8 @@ src_configure() {
 		--with-system-expat
 		--with-system-ffi
 		--with-wheel-pkg-dir="${EPREFIX}"/usr/lib/python/ensurepip
+
+		$(use_with valgrind)
 	)
 
 	# disable implicit optimization/debugging flags
diff --git a/dev-lang/python/python-3.9.15_p3.ebuild b/dev-lang/python/python-3.9.15_p3.ebuild
index 7b5a4be382ea..65e32a706fd5 100644
--- a/dev-lang/python/python-3.9.15_p3.ebuild
+++ b/dev-lang/python/python-3.9.15_p3.ebuild
@@ -31,7 +31,7 @@ SLOT="${PYVER}"
 KEYWORDS="~alpha amd64 arm arm64 hppa ~ia64 ~loong ~m68k ~mips ppc ppc64 ~riscv ~s390 sparc x86"
 IUSE="
 	bluetooth build +ensurepip examples gdbm hardened lto +ncurses pgo
-	+readline +sqlite +ssl test tk +xml
+	+readline +sqlite +ssl test tk valgrind +xml
 "
 RESTRICT="!test? ( test )"
 
@@ -68,6 +68,7 @@ DEPEND="
 	${RDEPEND}
 	bluetooth? ( net-wireless/bluez )
 	test? ( app-arch/xz-utils[extra-filters(+)] )
+	valgrind? ( dev-util/valgrind )
 "
 # autoconf-archive needed to eautoreconf
 BDEPEND="
@@ -216,6 +217,7 @@ src_configure() {
 
 		$(use_with lto)
 		$(use_enable pgo optimizations)
+		$(use_with valgrind)
 	)
 
 	# disable implicit optimization/debugging flags