media-plugins/gmsynth-lv2: new package, add 0.6.3

Closes: https://bugs.gentoo.org/966074
Signed-off-by: Nicolas PARLANT <nicolas.parlant@parhuet.fr>
Part-of: https://github.com/gentoo/gentoo/pull/44943
Signed-off-by: Miroslav Šulc <fordfrog@gentoo.org>

media-plugins/gmsynth-lv2/Manifest

@@ -0,0 +1 @@
+DIST gmsynth-lv2-0.6.3.tar.gz 29724144 BLAKE2B db6d79731d42888e9709730e24acc8be123cc52d69f82c369d9e0f0d962cf825e9e86825a51563bffd5cd8a16ea4e632de3038963bf3236f712803cf66311030 SHA512 96b7491ebd8f83dfb9e3289c6736ca5518e8513b472733feb91f16199be00e2a7fc433800bcc44fe7dd3d490382492e0b2403a3efaafe8fd219a999ae813d198

media-plugins/gmsynth-lv2/files/gmsynth-lv2-0.6.3-makefile.patch

@@ -0,0 +1,34 @@
+respect userflags
+--- a/Makefile
++++ b/Makefile
+@@ -17,18 +17,12 @@ gmsynth_VERSION?=$(shell git describe --tags HEAD 2>/dev/null | sed 's/-g.*$$//;
+ 
+ ###############################################################################
+ 
+-MACHINE=$(shell uname -m)
+-ifneq (,$(findstring x64,$(MACHINE)))
+-  HAVE_SSE=yes
+-endif
+-ifneq (,$(findstring 86,$(MACHINE)))
+-  HAVE_SSE=yes
+-endif
++HAVE_SSE ?= yes
+ 
+ ifeq ($(HAVE_SSE),yes)
+-  OPTIMIZATIONS ?= -msse -msse2 -mfpmath=sse -ffast-math -fomit-frame-pointer -O3 -fno-finite-math-only -DNDEBUG
++  OPTIMIZATIONS ?= -msse -msse2 -mfpmath=sse -ffast-math -fomit-frame-pointer -fno-finite-math-only -DNDEBUG
+ else
+-  OPTIMIZATIONS ?= -fomit-frame-pointer -O3 -fno-finite-math-only -DNDEBUG
++  OPTIMIZATIONS ?= -fomit-frame-pointer -fno-finite-math-only -DNDEBUG
+ endif
+ 
+ ###############################################################################
+@@ -166,7 +160,7 @@ DSP_DEPS = $(DSP_SRC)
+ 
+ $(BUILDDIR)$(LV2NAME)$(LIB_EXT): $(DSP_DEPS) Makefile
+ 	@mkdir -p $(BUILDDIR)
+-	$(CC) $(CPPFLAGS) $(CFLAGS) -std=gnu99 \
++	$(CC) $(CPPFLAGS) -std=gnu99 $(CFLAGS) \
+ 	  -o $(BUILDDIR)$(LV2NAME)$(LIB_EXT) $(DSP_SRC) \
+ 	  -shared $(LV2LDFLAGS) $(LDFLAGS) $(LOADLIBES)
+	$(STRIP) $(STRIPFLAGS) $(BUILDDIR)$(LV2NAME)$(LIB_EXT)

media-plugins/gmsynth-lv2/gmsynth-lv2-0.6.3.ebuild

@@ -0,0 +1,47 @@
+# Copyright 2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+inherit toolchain-funcs
+
+DESCRIPTION="General MIDI Sample Player Plugin"
+HOMEPAGE="https://x42-plugins.com/x42/x42-gmsynth"
+SRC_URI="https://github.com/x42/gmsynth.lv2/archive/refs/tags/v${PV}.tar.gz -> ${P}.tar.gz"
+S="${WORKDIR}/${P/-lv2/.lv2}"
+
+LICENSE="GPL-2+"
+SLOT="0"
+KEYWORDS="~amd64 ~x86"
+IUSE="cpu_flags_x86_sse2"
+
+DEPEND="
+	dev-libs/glib:2
+	>=media-libs/lv2-1.18.6
+"
+RDEPEND="${DEPEND}"
+BDEPEND="
+	virtual/pkgconfig
+"
+
+PATCHES=(
+	"${FILESDIR}"/${PN}-0.6.3-makefile.patch
+)
+
+src_compile() {
+	tc-export PKG_CONFIG CC
+	MYEMAKEARGS=(
+		gmsynth_VERSION="${PV}"
+		HAVE_SSE="$(usex cpu_flags_x86_sse2)"
+		# not standard but aligned with the path used by ardour
+		# https://lv2plug.in/pages/filesystem-hierarchy-standard.html
+		LV2DIR="${EPREFIX}/usr/$(get_libdir)/lv2"
+		PREFIX="${EPREFIX}/usr"
+		STRIP="true"
+	)
+	emake "${MYEMAKEARGS[@]}"
+}
+
+src_install() {
+	emake "${MYEMAKEARGS[@]}" DESTDIR="${D}" install
+}

media-plugins/gmsynth-lv2/metadata.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+  <maintainer type="project">
+    <email>proaudio@gentoo.org</email>
+    <name>Gentoo ProAudio Project</name>
+  </maintainer>
+  <upstream>
+    <remote-id type="github">x42/gmsynth.lv2</remote-id>
+  </upstream>
+</pkgmetadata>