dev-libs/libsecp256k1: drop "precompute-ecmult" USE flag

And change the ecmult window size for USE="lowmem" from 2 to 4.

Suggested-by: Tim Ruffing <[email protected]>
See: bitcoin-core/secp256k1#1159 (comment)
See: https://gitlab.com/bitcoin/gentoo/-/commit/6e39601a748f3465f66a38e7989e7414a4a1d9c0
Signed-off-by: Matt Whitlock <[email protected]>

Author: whitslack

dev-libs/libsecp256k1/libsecp256k1-0.1_pre20201028.ebuild dev-libs/libsecp256k1/libsecp256k1-0.1_pre20201028-r1.ebuild

@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2023 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -14,13 +14,12 @@ SRC_URI="https://github.com/bitcoin-core/${MyPN}/archive/${COMMITHASH}.tar.gz ->
 LICENSE="MIT"
 SLOT="0"
 KEYWORDS="amd64 ~arm ~arm64 ~mips ~ppc ~ppc64 x86 ~amd64-linux ~x86-linux"
-IUSE="+asm ecdh +experimental +extrakeys gmp lowmem precompute-ecmult +schnorr +recovery test test-openssl valgrind"
+IUSE="+asm ecdh +experimental +extrakeys gmp lowmem +recovery +schnorr test test-openssl valgrind"
 RESTRICT="!test? ( test )"
 
 REQUIRED_USE="
 	asm? ( || ( amd64 arm ) arm? ( experimental ) )
 	extrakeys? ( experimental )
-	?? ( lowmem precompute-ecmult )
 	schnorr? ( experimental extrakeys )
 	test-openssl? ( test )
 "
@@ -63,8 +62,7 @@ src_configure() {
 		--with-bignum=$(usex gmp gmp no) \
 		$(use_enable recovery module-recovery) \
 		$(use_enable schnorr module-schnorrsig) \
-		$(usex lowmem '--with-ecmult-window=2 --with-ecmult-gen-precision=2' '') \
-		$(usex precompute-ecmult '--with-ecmult-window=24 --with-ecmult-gen-precision=8' '') \
+		$(usex lowmem '--with-ecmult-window=4 --with-ecmult-gen-precision=2' '') \
 		$(use_with valgrind) \
 		--disable-static
 }

dev-libs/libsecp256k1/libsecp256k1-0.2.0-r1.ebuild dev-libs/libsecp256k1/libsecp256k1-0.2.0-r2.ebuild

@@ -13,11 +13,10 @@ SRC_URI="https://github.com/bitcoin-core/secp256k1/archive/v${PV}.tar.gz -> ${P}
 LICENSE="MIT"
 SLOT="0/1"  # subslot is "$((_LIB_VERSION_CURRENT-_LIB_VERSION_AGE))" from configure.ac
 KEYWORDS="~amd64 ~arm ~arm64 ~mips ~ppc ~ppc64 ~x86 ~amd64-linux ~x86-linux"
-IUSE="+asm +ecdh experimental +extrakeys lowmem precompute-ecmult +schnorr +recovery test valgrind"
+IUSE="+asm +ecdh experimental +extrakeys lowmem +recovery +schnorr test valgrind"
 RESTRICT="!test? ( test )"
 
 REQUIRED_USE="
-	?? ( lowmem precompute-ecmult )
 	asm? ( || ( amd64 arm ) arm? ( experimental ) )
 	schnorr? ( extrakeys )
 "
@@ -46,8 +45,7 @@ src_configure() {
 		$(use_enable {,module-}extrakeys)
 		$(use_enable {,module-}recovery)
 		$(use_enable schnorr module-schnorrsig)
-		$(usev lowmem '--with-ecmult-window=2 --with-ecmult-gen-precision=2')
-		$(usev precompute-ecmult '--with-ecmult-window=24 --with-ecmult-gen-precision=8')
+		$(usev lowmem '--with-ecmult-window=4 --with-ecmult-gen-precision=2')
 		$(use_with valgrind)
 	)
 	if use asm; then

dev-libs/libsecp256k1/metadata.xml

@@ -15,8 +15,7 @@
     <flag name="endomorphism">Enable endomorphism</flag>
     <flag name="experimental">Allow experimental USE flags</flag>
     <flag name="extrakeys">Enable extrakeys module</flag>
-    <flag name="lowmem">Reduce runtime memory usage at the expense of performance (ecmult window size 2, gen precision 2)</flag>
-    <flag name="precompute-ecmult">Use over 512 MB memory at runtime for better performance (ecmult window size 24, gen precision 8)</flag>
+    <flag name="lowmem">Reduce runtime memory usage at the expense of performance (ecmult window size 4, gen precision 2)</flag>
     <flag name="recovery">Enable ECDSA pubkey recovery module</flag>
     <flag name="schnorr">Enable Schnorr signature module</flag>
     <flag name="test-openssl">Enable OpenSSL comparison tests</flag>