hdf5: fix build for Xcode 15.x

science/hdf5/Portfile

@@ -72,6 +72,16 @@ configure.args \
                     --with-szlib=${prefix}/lib/libaec \
                     --with-zlib=yes
 
+if { [vercmp ${xcodeversion} >= 15.0] || [vercmp ${xcodecltversion} >= 15.0] } {
+    # On macOS13 and newer ensure the 'legacy' linker is used as GCC currently has problems
+    # with the new default linker in Xcode 15. See e.g.
+    # https://developer.apple.com/documentation/xcode-release-notes/xcode-15-release-notes#Linking
+    # https://discussions.apple.com/thread/255137447
+    # https://developer.apple.com/forums/thread/737707
+    # https://github.com/Homebrew/homebrew-core/issues/145991
+    configure.env   LDFLAGS=-ld_classic
+}
+
 # Actively checks how to get clang to warn on implicit functions with this.
 configure.checks.implicit_function_declaration.whitelist-append strchr