sys-config/ltobase: add simple lto cfg based on ltoize remnants

Signed-off-by: Stephen L Arnold <[email protected]>

sys-config/ltobase/files/env/nolto.conf

@@ -0,0 +1,5 @@
+# Env setup to disable LTO for problem builds
+CFLAGS="${CFLAGS} -fno-lto"
+CXXFLAGS="${CXXFLAGS} -fno-lto"
+FCFLAGS="${FCFLAGS} -fno-lto"
+FFLAGS="${FFLAGS} -fno-lto"

sys-config/ltobase/files/env/plus-dl.conf

@@ -0,0 +1,3 @@
+LIBS="${LIBS} -ldl"
+LDADD="${LDADD} -ldl"
+#LDFLAGS="${LDFLAGS} -ldl"

sys-config/ltobase/files/env/plus-m.conf

@@ -0,0 +1,3 @@
+LIBS="${LIBS} -lm"
+LDADD="${LDADD} -lm"
+#LDFLAGS="${LDFLAGS} -lm"

sys-config/ltobase/files/make.conf.lto

@@ -0,0 +1,8 @@
+NPROC=$(nproc)
+NUMCPUS=${NTHREADS:-$NPROC}
+
+LTO_FLAGS="-flto=${NUMCPUS} -fuse-linker-plugin"
+VEC_FLAGS="-ftree-vectorize -fvect-cost-model=cheap"
+GRAPHITE="-fgraphite-identity -floop-nest-optimize"
+TUNE_FLAGS="-fdevirtualize-at-ltrans"
+COMMON_FLAGS="${OPT_FLAGS} ${LTO_FLAGS} ${VEC_FLAGS} ${GRAPHITE} ${TUNE_FLAGS}"

sys-config/ltobase/files/package.env/link-dl

@@ -0,0 +1,2 @@
+sys-libs/ncurses-compat plus-dl.conf
+sys-libs/ncurses plus-dl.conf

sys-config/ltobase/files/package.env/link-m

@@ -0,0 +1 @@
+sys-devel/gettext plus-m.conf

sys-config/ltobase/files/package.env/noltobuild

@@ -0,0 +1,59 @@
+sys-libs/libomp nolto.conf
+sys-apps/sandbox nolto.conf
+dev-libs/gmp nolto.conf
+dev-libs/elfutils nolto.conf
+media-libs/alsa-lib nolto.conf
+media-sound/pulseaudio nolto.conf
+
+app-admin/keepassxc nolto.conf
+app-emulation/dosemu nolto.conf
+app-emulation/libguestfs nolto.conf
+app-emulation/libpod nolto.conf
+app-emulation/qemu nolto.conf
+app-emulation/virtualbox-extpack-oracle nolto.conf
+app-emulation/virtualbox nolto.conf
+app-text/texlive-core nolto.conf
+cross-arm-none-eabi/newlib nolto.conf
+
+dev-java/icedtea nolto.conf
+dev-lang/erlang nolto.conf
+dev-lang/lua nolto.conf
+dev-lang/perl nolto.conf
+dev-lang/rust nolto.conf
+dev-lang/spidermonkey nolto.conf
+dev-python/libvirt-python nolto.conf
+dev-scheme/guile nolto.conf
+dev-scheme/racket nolto.conf
+dev-util/valgrind nolto.conf
+
+net-analyzer/wireshark nolto.conf
+net-libs/nodejs nolto.conf
+net-libs/webkit-gtk:3 nolto.conf
+net-libs/webkit-gtk:4 nolto.conf
+
+sys-apps/acl nolto.conf
+sys-devel/clang nolto.conf
+sys-devel/gcc nolto.conf
+sys-devel/gdb nolto.conf
+sys-devel/llvm nolto.conf
+sys-libs/glibc nolto.conf
+sys-fs/fuse-common nolto.conf
+sys-fs/fuse nolto.conf
+sys-libs/libcxxabi nolto.conf
+
+app-crypt/gcr nolto.conf
+dev-lang/ruby nolto.conf
+dev-libs/folks nolto.conf
+dev-libs/libaio nolto.conf
+dev-libs/libbsd nolto.conf
+dev-libs/libpcre nolto.conf
+dev-libs/protobuf nolto.conf
+
+media-libs/mesa nolto.conf
+net-misc/networkmanager nolto.conf
+net-misc/openssh nolto.conf
+net-proxy/privoxy nolto.conf
+>=sys-apps/attr-2.4.48 nolto.conf
+sys-libs/libxcrypt nolto.conf
+app-misc/openrgb nolto.conf
+net-mail/mailutils nolto.conf

sys-config/ltobase/files/patches/dev-libs/gmp/arm64-lto.patch

@@ -0,0 +1,45 @@
+diff -r 575ff753614f mpn/arm64/bdiv_q_1.asm
+--- a/mpn/arm64/bdiv_q_1.asm	Fri Jan 01 14:46:22 2021 +0100
++++ b/mpn/arm64/bdiv_q_1.asm	Fri Jan 01 17:13:01 2021 +0100
+@@ -61,9 +61,15 @@
+ 	clz	cnt, x6
+ 	lsr	d, d, cnt
+
+-	LEA_HI(	x7, binvert_limb_table)
++ifdef(`PIC',`
++	adrp	x7, :got:__gmp_binvert_limb_table
+ 	ubfx	x6, d, 1, 7
+-	LEA_LO(	x7, binvert_limb_table)
++	ldr	x7, [x7, #:got_lo12:__gmp_binvert_limb_table]
++',`
++	adrp	x7, __gmp_binvert_limb_table
++	ubfx	x6, d, 1, 7
++	add	x7, x7, :lo12:__gmp_binvert_limb_table
++')
+ 	ldrb	w6, [x7, x6]
+ 	ubfiz	x7, x6, 1, 8
+ 	umull	x6, w6, w6
+@@ -75,7 +81,7 @@
+ 	mul	x6, x6, x6
+ 	msub	di, x6, d, x7
+
+-	b	GSYM_PREFIX`'mpn_pi1_bdiv_q_1
++	b	mpn_pi1_bdiv_q_1
+ EPILOGUE()
+
+ PROLOGUE(mpn_pi1_bdiv_q_1)
+diff -r 575ff753614f mpn/arm64/invert_limb.asm
+--- a/mpn/arm64/invert_limb.asm	Fri Jan 01 14:46:22 2021 +0100
++++ b/mpn/arm64/invert_limb.asm	Fri Jan 01 17:13:01 2021 +0100
+@@ -41,9 +41,9 @@
+ ASM_START()
+ PROLOGUE(mpn_invert_limb)
+ 	lsr	x2, x0, #54
+-	LEA_HI(	x1, approx_tab)
++	adrp	x1, approx_tab
+ 	and	x2, x2, #0x1fe
+-	LEA_LO(	x1, approx_tab)
++	add	x1, x1, :lo12:approx_tab
+ 	ldrh	w3, [x1,x2]
+ 	lsr	x4, x0, #24
+ 	add	x4, x4, #1

sys-config/ltobase/ltobase-0.1.0.ebuild

@@ -0,0 +1,88 @@
+# Copyright 1999-2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit toolchain-funcs
+
+DESCRIPTION="A base LTO override configuration for portage"
+HOMEPAGE="https://github.com/VCTLabs/embedded-overlay"
+
+# Note: there's nothing preventing this from working on stable
+KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~m68k ~mips ~ppc ~ppc64 ~s390 ~sparc ~x86"
+
+SRC_URI=""
+
+LICENSE="GPL-2+"
+SLOT="0"
+IUSE="clang"
+
+# portage-bashrc-mv or runtitle can be installed from mv overlay
+DEPEND="
+    sys-apps/portage
+    sys-devel/binutils-config
+    sys-devel/gcc-config
+"
+RDEPEND="${DEPEND}"
+
+S="${WORKDIR}"
+DOCS=""
+
+# Test binutils and gcc version
+pkg_setup() {
+
+    ACTIVE_GCC=$(gcc-fullversion)
+
+    if ver_test "${ACTIVE_GCC}" -lt 10.2.0; then
+        ewarn "Warning: Active GCC version '$ACTIVE_GCC' is lower then the expected version '10.2.0', it is recommended that you use the newest GCC if you want LTO."
+        if [ "${I_KNOW_WHAT_I_AM_DOING}" != "y" ]; then
+            eerror "Aborting LTObase installation due to older GCC version '$ACTIVE_GCC' -- set I_KNOW_WHAT_I_AM_DOING=y if you want to override this behaviour."
+            die
+        else
+            ewarn "I_KNOW_WHAT_I_AM_DOING=y -- continuing anyway"
+        fi
+    fi
+
+    if [ -f "${PORTAGE_CONFIGROOT%/}/etc/portage/package.env" ]; then
+        eerror "${PORTAGE_CONFIGROOT%/}/etc/portage/package.env is a file not a directory.  Please convert package.env to a directory with the current contents of package.env being moved to a file inside it."
+        die
+    fi
+}
+
+src_install() {
+    local BASE_CONFIG="env package.env patches"
+    local PKG_ENV="link-dl  link-m  noltobuild"
+    local ENV_CONF="nolto.conf  plus-dl.conf  plus-m.conf"
+    dodir /etc/ltobase
+    insinto /etc/ltobase
+    doins "${FILESDIR}/make.conf.lto"
+    for dir in $BASE_CONFIG ; do
+        doins -r "${FILESDIR}/$dir"
+    done
+
+    dodir /etc/portage/env /etc/portage/package.env
+    dosym -r /etc/ltobase/make.conf.lto /etc/portage/make.conf.lto
+    for file in $PKG_ENV ; do
+        dosym -r /etc/ltobase/package.env/$file /etc/portage/package.env/$file
+    done
+    for file in $ENV_CONF ; do
+        dosym -r /etc/ltobase/env/$file /etc/portage/env/$file
+    done
+}
+
+pkg_postinst() {
+
+    elog "If you have not done so, you will need to modify your make.conf settings to enable LTO building on your system."
+    elog "A symlink has been placed in ${PORTAGE_CONFIGROOT%/}/etc/portage/make.conf.lto that can be used as a basis for these modifications."
+    elog "See README.rst for more details."
+
+    elog "If you add an override for a particular package, please consider sending a pull request upstream so that other users of this repository can benefit."
+    ewarn "You will require a complete system rebuild in order to gain the benefits of LTO system-wide."
+    echo
+
+    BINUTILS_VER=$(binutils-config ${CHOST} -c | sed -e "s/.*-//")
+
+    if ver_test "${BINUTILS_VER}" -lt 2.34; then
+        ewarn "Warning: active binutils version < 2.34, it is recommended that you use the newest binutils for LTO."
+    fi
+}