graphics/jpeg-xl: enable LTO by default

3% faster at least with -s 9 (tortoise) and 2100x2800 input.

Beware of dragons on non-amd64 e.g.,

  $ cjxl -s 9 foo.png foo.jxl
    J P E G   \/ |
	      /\ |_   e n c o d e r    [v0.3.2 | SIMD supported: SSE4,Scalar]

  Read 2100x2800 image, 47.7 MP/s
  Encoding [VarDCT, d1.000, tortoise], 8 threads.
  lib/jxl/butteraugli/butteraugli.cc:99: JXL_CHECK: out->xsize() == in.ysize()
  Illegal instruction

graphics/jpeg-xl/Makefile

@@ -3,6 +3,7 @@
 PORTNAME=	jpeg-xl
 DISTVERSIONPREFIX=	v
 DISTVERSION=	0.3.2
+PORTREVISION=	1
 CATEGORIES=	graphics
 
 MAINTAINER=	jbeich@FreeBSD.org
@@ -31,8 +32,10 @@ CMAKE_OFF=	JPEGXL_WARNINGS_AS_ERRORS ${BENCHMARK FUZZERS TCMALLOC:L:S/^/JPEGXL_E
 CMAKE_OFF+=	${OpenGL GLUT:L:S/^/CMAKE_DISABLE_FIND_PACKAGE_/} # sjpeg
 LDFLAGS+=	-Wl,--as-needed # brotlicommon, GIMP/OPENEXR/PNG deps
 
-OPTIONS_DEFINE=	GIF GIMP JPEG OPENEXR PIXBUF PNG TEST
-OPTIONS_DEFAULT=GIF GIMP JPEG OPENEXR PIXBUF PNG
+OPTIONS_DEFINE=	GIF GIMP JPEG LTO OPENEXR PIXBUF PNG TEST
+OPTIONS_DEFAULT=GIF GIMP JPEG LTO OPENEXR PIXBUF PNG
+OPTIONS_EXCLUDE_i386=	LTO # ConvolutionWithTranspose(): JXL_CHECK: out->xsize() == in.ysize()
+OPTIONS_EXCLUDE_powerpc64=	${"${/usr/bin/ld:L:tA}"==/usr/bin/ld.lld:?LTO:} # LLVM bug 47353
 OPTIONS_SUB=	yes
 
 GIF_LIB_DEPENDS=	libgif.so:graphics/giflib
@@ -46,6 +49,13 @@ GIMP_LIB_DEPENDS=	libgegl-0.4.so:graphics/gegl \
 JPEG_USES=		jpeg
 JPEG_CMAKE_BOOL_OFF=	CMAKE_DISABLE_FIND_PACKAGE_JPEG
 
+LTO_CMAKE_BOOL=		CMAKE_INTERPROCEDURAL_OPTIMIZATION
+LTO_CMAKE_ON=		-DCMAKE_POLICY_DEFAULT_CMP0069:STRING=NEW
+.if exists(/usr/bin/ld.lld) && ${/usr/bin/ld:L:tA} != /usr/bin/ld.lld
+# --plugin isn't supported by old GNU ld.bfd in base
+LTO_LDFLAGS=		-fuse-ld=lld
+.endif
+
 OPENEXR_LIB_DEPENDS=	libHalf.so:graphics/ilmbase \
 			libIlmImf.so:graphics/openexr
 OPENEXR_CMAKE_BOOL=	JPEGXL_ENABLE_OPENEXR