Ticket #47808: jpeg.diff

graphics/jpeg/Portfile

@@ -4 +4 @@
 PortSystem          1.0
 
 name                jpeg
-conflicts           libjpeg-turbo mozjpeg
 version             9a
-revision            1
+revision            2
 categories          graphics
 platforms           darwin freebsd sunos
 maintainers         ryandesign openmaintainer
@@ -32 +31 @@
 
 configure.ldflags-delete    -L${prefix}/lib
 configure.cppflags-delete   -I${prefix}/include
-configure.args      --disable-silent-rules
+configure.args              --disable-silent-rules --disable-dependency-tracking
+
+# install libjpeg into its own prefix, to allow it to co-exist with libjpeg-turbo or mozjpeg
+# which provide an earlier ABI version (jpeg8):
+set jpeg_dir                libexec/jpeg
+configure.pre_args-delete   --prefix=${prefix}
+configure.pre_args-append   --prefix=${prefix}/${jpeg_dir}
+
+# libjpeg as provided port:jpeg is slated for replacement by either libjpeg-turbo or mozjpeg;
+# to prepare for that change, port:jpeg installs into its own prefix, ${prefix}/libexec/jpeg .
+# During a grace period, provide a means to make the change in install location fully transparent
+# so that no ports need to be rebuilt because of it
+variant transitional description {make the change in install location fully transparent} {
+    # using this variant reintroduces the conflict with the libjpeg alternatives
+    conflicts           libjpeg-turbo mozjpeg
+}
+# this variant is the default for the time being
+default_variants    +transitional
+
+if {![variant_exists transitional]} {
+    # after the grace period, the transitional variant will disappear and port:jpeg
+    # *could* be marked as having been replaced by libjpeg-turbo ... if there's a
+    # guarantee that it will never be required anymore.
+#     replaced_by     libjpeg-turbo
+#     PortGroup       obsolete 1.0
+}
 
 test.run            yes
 
@@ -42 +66 @@
     xinstall -m 644 -W ${worksrcpath} \
         README change.log libjpeg.txt structure.txt usage.txt wizard.txt \
         ${destroot}${docdir}
+
+    if {[variant_exists transitional]} {
+        if {[variant_isset transitional]} {
+            # symlink the port's payload to the usual locations in ${prefix}
+            foreach f [glob ${destroot}/${prefix}/${jpeg_dir}/bin/*] {
+                set fn [lindex [split ${f} /] end]
+                ln -s ../${jpeg_dir}/bin/${fn} ${destroot}${prefix}/bin
+            }
+            foreach f [glob ${destroot}/${prefix}/${jpeg_dir}/include/*] {
+                set fn [lindex [split ${f} /] end]
+                ln -s ../${jpeg_dir}/include/${fn} ${destroot}${prefix}/include
+            }
+            foreach f [glob ${destroot}/${prefix}/${jpeg_dir}/lib/*] {
+                set fn [lindex [split ${f} /] end]
+                ln -s ../${jpeg_dir}/lib/${fn} ${destroot}${prefix}/lib
+            }
+            foreach f [glob ${destroot}/${prefix}/${jpeg_dir}/share/man/man1/*] {
+                set fn [lindex [split ${f} /] end]
+                ln -s ../${jpeg_dir}/share/man/man1/${fn} ${destroot}${prefix}/share/man/man1
+            }
+        } else {
+            # even during the grace period, a user could decide to install, say, libjpeg-turbo
+            # in addition to port:jpeg . The minimal requirement for not having to rebuild all
+            # ports in that case is to provide libjpeg.9.dylib where it is expected.
+            ln -s ../${jpeg_dir}/lib/libjpeg.9.dylib ${destroot}${prefix}/lib
+        }
+    }
 }
 
 livecheck.type      regex
 livecheck.url       [lindex ${master_sites} 0]
-livecheck.regex     ${name}src.v(.*?)${extract.suffix}
+livecheck.regex     ${name}src.v(.*?)${extract.suffix}
+ No newline at end of file