Ticket #52554: libomp.patch

ports/lang/libomp/Portfile

@@ -24 +24 @@
 subport                 libomp-devel {}
 
 if {${subport} ne ${name}} {
-    if {${os.platform} eq "darwin" && ${os.major} <= 12} {
+    if {${os.platform} eq "darwin" && ${configure.cxx_stdlib} eq "libstdc++"} {
         version                 291764
         replaced_by             libomp
     } else {
@@ -45 +45 @@
     }
 } else {
     conflicts               libomp-devel
-    if {${os.platform} eq "darwin" && ${os.major} > 12} {
+    if {${os.platform} eq "darwin" && ${configure.cxx_stdlib} eq "libstdc++"} {
+        if {${os.major} <= 12} {
+            # kmp_alloc.c includes <atomic> but libc++ is not the default on these systems
+            # see https://trac.macports.org/ticket/52554
+            configure.cflags-appends -stdlib=libc++
+        }
         github.setup            llvm-mirror openmp 391 svn-tags/RELEASE_
         worksrcdir              openmp-${version}/rc1/runtime
         version                 3.9.1