sci-mathematics/octave: new revision fixing some dependency issues.

This revision adds a new flag, USE=imagemagick, to pull in
media-gfx/graphicsmagick. That's not a typo -- the global USE flag
descriptions for "imagemagick" and "graphicsmagick" make this awkward.
In any case, Octave upstream doesn't really support imagemagick, only
graphicsmagick. Thanks to Fabio Rossi for reporting the issue and
suggesting the fix.

Furthermore,

  1. media-gfx/graphicsmagick was moved to DEPEND because Octave
     links with it.

  2. The "static-libs" USE flag was dropped.

  3. A new flag, USE=fltk, was factored out of USE=opengl. The Qt
     GUI can make use of OpenGL on its own.

  4. An old hack for linking with fltk was dropped.

  5. A new REQUIRED_USE prevents some nonsense combinations of the
     X, gui, fltk, and opengl USE flags.

  6. Local descriptions for the fltk, gnuplot, and imagemagick flags
     were added to metadata.xml to explain more accurately what they
     actually do.

Closes: https://bugs.gentoo.org/864785
Signed-off-by: Michael Orlitzky <mjo@gentoo.org>

sci-mathematics/octave/metadata.xml

@@ -9,7 +9,10 @@
   Octave is a high-level language, primarily intended for numerical computations. It provides a convenient command line interface for solving linear and nonlinear problems numerically, and for performing other numerical experiments. It may also be used as a batch-oriented language.
   </longdescription>
   <use>
+    <flag name="fltk">Use <pkg>x11-libs/fltk</pkg> as the backend for the OpenGL renderer in the absence of the Qt GUI</flag>
     <flag name="glpk">Add support for <pkg>sci-mathematics/glpk</pkg> for linear programming</flag>
+    <flag name="gnuplot">Use <pkg>sci-visualization/gnuplot</pkg> to render plots if OpenGL is unavailable</flag>
+    <flag name="imagemagick">Use <pkg>media-gfx/graphicsmagick</pkg> to read and write images</flag>
     <flag name="json">Allow using jsonencode and jsondecode commands via <pkg>dev-libs/rapidjson</pkg></flag>
     <flag name="qhull">Add support for <pkg>media-libs/qhull</pkg>, to allow `delaunay', `convhull', and related functions</flag>
     <flag name="qrupdate">Add support for <pkg>sci-libs/qrupdate</pkg>for QR and Cholesky update functions</flag>

sci-mathematics/octave/octave-7.3.0-r1.ebuild

@@ -3,7 +3,7 @@
 
 EAPI=8
 
-inherit autotools flag-o-matic fortran-2 java-pkg-opt-2 pax-utils qmake-utils toolchain-funcs xdg
+inherit autotools fortran-2 java-pkg-opt-2 pax-utils qmake-utils toolchain-funcs xdg
 
 DESCRIPTION="High-level interactive language for numerical computations"
 HOMEPAGE="https://www.gnu.org/software/octave/"
@@ -11,7 +11,7 @@ SRC_URI="mirror://gnu/${PN}/${P}.tar.xz"
 
 LICENSE="GPL-3"
 SLOT="0/${PV}"
-IUSE="curl doc fftw +glpk gnuplot gui hdf5 java json opengl portaudio postscript +qhull +qrupdate readline sndfile +sparse ssl static-libs sundials X zlib"
+IUSE="curl doc fftw fltk +glpk gnuplot gui hdf5 imagemagick java json opengl portaudio postscript +qhull +qrupdate readline sndfile +sparse ssl sundials X zlib"
 KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~ppc64 ~riscv ~x86 ~amd64-linux ~x86-linux"
 
 # Although it is listed in INSTALL.OCTAVE as a build tool, Octave runs
@@ -20,6 +20,11 @@ KEYWORDS="~amd64 ~arm ~arm64 ~ppc ~ppc64 ~riscv ~x86 ~amd64-linux ~x86-linux"
 #
 # (un)zip isn't mentioned, but there's a test that uses it (bug #775254).
 #
+# The use of USE=imagemagick to pull in media-gfx/graphicsmagick is not
+# ideal, but both "graphicsmagick" and "imagemagick" are global USE
+# flags whose existing descriptions conflict with the obvious way we
+# would want to use them in octave. In any case, upstream doesn't really
+# support imagemagick, only graphicsmagick (bug 864785).
 RDEPEND="
 	app-arch/bzip2
 	app-arch/unzip
@@ -33,6 +38,7 @@ RDEPEND="
 	virtual/lapack
 	curl? ( net-misc/curl:= )
 	fftw? ( sci-libs/fftw:3.0= )
+	fltk? ( >=x11-libs/fltk-1.3:1=[opengl,xft] )
 	glpk? ( sci-mathematics/glpk:= )
 	gnuplot? ( sci-visualization/gnuplot )
 	gui? (
@@ -46,13 +52,13 @@ RDEPEND="
 		x11-libs/qscintilla:=
 	)
 	hdf5? ( sci-libs/hdf5:= )
+	imagemagick? ( media-gfx/graphicsmagick:=[cxx] )
 	java? ( >=virtual/jre-1.8:* )
 	json? ( dev-libs/rapidjson )
 	opengl? (
 		media-libs/freetype:=
 		media-libs/fontconfig:=
 		virtual/glu
-		>=x11-libs/fltk-1.3:1=[opengl,xft]
 		x11-libs/gl2ps:=
 	)
 	portaudio? ( media-libs/portaudio )
@@ -83,7 +89,6 @@ RDEPEND="
 DEPEND="${RDEPEND}"
 BDEPEND="
 	dev-util/gperf
-	virtual/imagemagick-tools
 	virtual/pkgconfig
 	doc? (
 		dev-texlive/texlive-fontsrecommended
@@ -97,6 +102,30 @@ BDEPEND="
 	sparse? ( app-misc/pax-utils )
 "
 
+# There are three ways to plot in Octave:
+#
+#   1. The old gnuplot renderer
+#   2. The OpenGL renderer using the FLTK backend
+#   3. The OpenGL renderer using the Qt backend
+#
+# It's possible to use the Qt GUI without OpenGL, but OpenGL rendering
+# is all that FLTK is used for, so it doesn't make sense to enable
+# USE=fltk without USE=opengl.
+#
+# Building without either USE=gnuplot or USE=opengl is technically legal,
+# but will leave you unable to plot anything.
+#
+# Octave's FLTK support is unofficially deprecated, in the sense that
+# you'll often get "why are you using FLTK?" in response to
+# bugs. (Upstream bug 59321 for a random example.) In the future, it
+# will probably make sense to merge USE=opengl and USE=X into USE=gui,
+# dropping USE=fltk entirely.
+REQUIRED_USE="
+	fltk? ( opengl X )
+	gui? ( X )
+	opengl? ( || ( fltk gui ) )
+"
+
 PATCHES=(
 	"${FILESDIR}"/${PN}-5.1.0-pkgbuilddir.patch
 	"${FILESDIR}"/${PN}-4.2.2-ncurses-pkgconfig.patch
@@ -107,11 +136,6 @@ PATCHES=(
 src_prepare() {
 	default
 
-	# nasty prefix hacks for fltk:1 linking
-	if use prefix; then
-		use opengl && append-ldflags -Wl,-rpath,"${EPREFIX}/usr/$(get_libdir)/fltk-1"
-	fi
-
 	# occasional fail on install, force regeneration (bug #401189)
 	rm doc/interpreter/contributors.texi || die
 
@@ -147,7 +171,6 @@ src_configure() {
 		--enable-shared \
 		--with-z \
 		--with-bz2 \
-		$(use_enable static-libs static) \
 		$(use_enable doc docs) \
 		$(use_enable java) \
 		$(use_enable json rapidjson) \
@@ -158,8 +181,9 @@ src_configure() {
 		$(use_enable fftw fftw-threads) \
 		$(use_with glpk) \
 		$(use_with hdf5) \
+		$(use_with imagemagick magick GraphicsMagick++) \
 		$(use_with opengl) \
-		$(use_with opengl fltk) \
+		$(use_with fltk) \
 		$(use_with ssl openssl) \
 		$(use_with portaudio) \
 		$(use_with qhull qhull_r) \