From ad3366e1d489b6796bd7385f35bcc19e0c8f4a43 Mon Sep 17 00:00:00 2001
From: Ken Cunningham <ken.cunningham.webuse@gmail.com>
Date: Sat, 29 Apr 2017 11:52:19 -0700
Subject: [PATCH] ImageMagick: add openmp variant

Closes: https://trac.macports.org/ticket/54050
---
 graphics/ImageMagick/Portfile | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/graphics/ImageMagick/Portfile b/graphics/ImageMagick/Portfile
index 897893cd7b093..940c028737ad3 100644
--- a/graphics/ImageMagick/Portfile
+++ b/graphics/ImageMagick/Portfile
@@ -10,6 +10,7 @@ PortGroup                   conflicts_build 1.0
 
 name                        ImageMagick
 version                     6.9.8-4
+revision                    1
 set reasonable_version      [lindex [split ${version} -] 0]
 homepage                    http://www.imagemagick.org/
 categories                  graphics devel
@@ -110,6 +111,7 @@ configure.args              --enable-shared \
                             --without-rsvg \
                             --without-lqr \
                             --without-pango \
+                            --disable-openmp \
                             --without-x \
                             --with-gs-font-dir=${prefix}/share/fonts/urw-fonts
 
@@ -120,6 +122,23 @@ test.env                    DYLD_LIBRARY_PATH=${worksrcpath}/magick/.libs
 # ImageMagick uses .la files at runtime to find its coder modules.
 destroot.delete_la_files    no
 
+variant openmp description {Enable OpenMP} {
+    configure.args-replace  --disable-openmp --enable-openmp
+
+    # Clang >3.8 supports OpenMP - support is best in newest clang versions
+    # leave older systems alone - they can't build new clangs, but get openmp via gcc
+    if {${os.platform} eq "darwin" && ${os.major} > 9} {
+        depends_lib-append    port:libomp
+        compiler.whitelist    macports-clang-3.9  macports-clang-4.0
+    }
+
+    notes-append "
+Using ImageMagick with OpenMP can require specific tuning. \
+See the following page for an exhaustive list of the consequences of this feature:
+https://www.imagemagick.org/script/architecture.php
+"
+}
+
 variant graphviz description {Support Graphviz} {
     depends_lib-append      path:bin/dot:graphviz
     configure.args-replace  --without-gvc --with-gvc