media-libs/libpano13: fix build with gcc 15 for bug #956590

Bug: https://bugs.gentoo.org/956590
Signed-off-by: Markus Meier <maekke@gentoo.org>

media-libs/libpano13/files/libpano13-2.9.22-fabs-sqrt.patch

@@ -0,0 +1,19 @@
+diff '--color=auto' -ru libpano13-2.9.22.orig/lmdif.c libpano13-2.9.22/lmdif.c
+--- libpano13-2.9.22.orig/lmdif.c	2025-05-25 09:57:52.790672552 +0200
++++ libpano13-2.9.22/lmdif.c	2025-05-25 09:58:26.444542495 +0200
+@@ -1222,7 +1222,6 @@
+ static double zero = 0.0;
+ static double p25 = 0.25;
+ static double p5 = 0.5;
+-double fabs(), sqrt();
+ 
+ /*
+ *     copy r and (q transpose)*b to preserve input and initialize s.
+@@ -1416,7 +1415,6 @@
+ static double rgiant = 1.304e19;
+ static double zero = 0.0;
+ static double one = 1.0;
+-double fabs(), sqrt();
+ 
+ s1 = zero;
+ s2 = zero;

media-libs/libpano13/files/libpano13-2.9.22-gcc15.patch

@@ -0,0 +1,50 @@
+
+
+Fix for gcc15 breakage (Lukas Wirz)
+
+https://bugs.launchpad.net/bugs/2096612
+
+abi-compliance-checker:
+Problems with Data Types
+High 0
+Medium 0
+Low 1
+filter.h
+[+] typedef lmfunc 1
+Change Effect
+1 Base type has been changed from int(*)(...) to int(*)(int, int, double*, double*, int*). Recompilation of a client program may be broken.
+[+] affected symbols: 26 (4.7%)
+
+--- a/filter.h
++++ b/filter.h
+@@ -410,7 +410,7 @@
+ 
+ // function to minimize in Levenberg-Marquardt solver
+ 
+-typedef		int (*lmfunc)();	
++typedef int (*lmfunc)(int m, int n, double x[], double fvec[], int *iflag);
+ 
+ struct triangle
+ {
+@@ -774,13 +774,19 @@
+ PANO13_IMPEX void 	matrix_inv_mult		( double m[3][3], double vector[3] );
+ PANO13_IMPEX double 	smallestRoot		( double *p );
+ PANO13_IMPEX void 	SetCorrectionRadius	( cPrefs *cP );
+-PANO13_IMPEX int		lmdif				();
++PANO13_IMPEX int    lmdif(int m, int n, double x[], double fvec[],
++                          double ftol, double xtol, double gtol,
++                          int maxfev, double epsfcn, double diag[],
++                          int mode, double factor, int nprint,
++                          int *info, int *nfev, double fjac[],
++                          int ldfjac, int ipvt[], double qtf[],
++                          double wa1[], double wa2[], double wa3[], double wa4[]);
+ PANO13_IMPEX void	fourier				( TrformStr *TrPtr, cPrefs *cP );
+ PANO13_IMPEX unsigned short 	gamma_correct( double pix );
+ PANO13_IMPEX int 	EqualCPrefs( cPrefs *c1, cPrefs *c2 );
+ PANO13_IMPEX double 	OverlapRMS			( MultiLayerImage *mim );
+ PANO13_IMPEX double 	distSquared			( int num ); 
+-PANO13_IMPEX int		fcnPano();
++PANO13_IMPEX int    fcnPano(int m, int n, double x[], double fvec[], int *iflag);
+ PANO13_IMPEX int		EvaluateControlPointError ( int num, double *errptr, double errComponent[2]);
+ PANO13_IMPEX void 	doCoordinateTransform( CoordInfo *c, tMatrix *t );
+ PANO13_IMPEX void 	findOptimumtMatrix( transformCoord *tP, tMatrix *tM, lmfunc f);

media-libs/libpano13/libpano13-2.9.22-r1.ebuild

@@ -0,0 +1,53 @@
+# Copyright 1999-2025 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI="8"
+
+inherit java-pkg-opt-2 cmake
+
+DESCRIPTION="Helmut Dersch's panorama toolbox library"
+HOMEPAGE="http://panotools.sourceforge.net/"
+SRC_URI="https://downloads.sourceforge.net/panotools/${P}.tar.gz"
+S="${WORKDIR}/${PN}-$(ver_cut 1-3)"
+
+LICENSE="GPL-2"
+SLOT="0/3"
+KEYWORDS="~amd64 ~arm64 ~x86 ~amd64-linux ~x86-linux ~ppc-macos"
+IUSE="java static-libs suitesparse"
+
+DEPEND="media-libs/libpng:=
+	media-libs/tiff:=
+	media-libs/libjpeg-turbo:=
+	sys-libs/zlib
+	java? ( >=virtual/jdk-1.8:* )
+	suitesparse? ( sci-libs/suitesparse )"
+RDEPEND="${DEPEND}"
+
+PATCHES=(
+	"${FILESDIR}/${P}-gcc15.patch"
+	"${FILESDIR}/${P}-fabs-sqrt.patch"
+)
+
+pkg_setup() {
+	java-pkg-opt-2_pkg_setup
+}
+
+src_configure() {
+	local mycmakeargs=(
+		-DSUPPORT_JAVA_PROGRAMS=$(usex java)
+		-DUSE_SPARSE_LEVMAR=$(usex suitesparse)
+	)
+	cmake_src_configure
+}
+
+src_install() {
+	cmake_src_install
+
+	if ! use static-libs ; then
+		find "${D}" -name "*.a" -type f -delete || die
+	fi
+}
+
+pkg_preinst() {
+	java-pkg-opt-2_pkg_preinst
+}