macports-libcxx + llvm 18 (on Mavericks)

macports-libcxx-llvm18.patch

# Updates macports-libcxx to to support C++20.

diff --git a/lang/macports-libcxx/Portfile b/lang/macports-libcxx/Portfile
index 2648853..f152a2a 100644
--- a/lang/macports-libcxx/Portfile
+++ b/lang/macports-libcxx/Portfile
@@ -16,10 +16,10 @@ long_description    This port installs a recent libc++ from llvm \
 # for now, we will leverage the already-built libc++ in the appropriate clang port
 # later, we can build this independently if we choose to do so, much like libtapi
 
-# the clang-11 version in use when this port is updated will be used
-version             11.1.0
-set clangversion    11
-revision            0
+# the clang-18 version in use when this port is updated will be used
+version             18.1.8
+set clangversion    18
+revision            1
 
 depends_build       port:clang-${clangversion}
 
@@ -48,28 +48,30 @@ variant universal {}
 destroot {
 
     xinstall -d ${destroot}${prefix}/include/libcxx
-    copy  ${prefix}/libexec/llvm-${clangversion}/lib/c++/v1 ${destroot}${prefix}/include/libcxx/
+    copy  ${prefix}/libexec/llvm-${clangversion}/include/c++/v1 ${destroot}${prefix}/include/libcxx/
 
     # disable Apple libc++ availability tests, as we're using a new libc++ with these headers
     system -W ${destroot}${prefix}/include/libcxx/v1 "patch -p0 < ${filespath}/patch-disable-availabilty.diff"
 
     xinstall -d ${destroot}${prefix}/lib/libcxx
-    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++.1.0.dylib ${destroot}${prefix}/lib/libcxx/libc++.1.0.dylib
+    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++/libc++.1.0.dylib ${destroot}${prefix}/lib/libcxx/libc++.1.0.dylib
     system -W  ${destroot}${prefix}/lib/libcxx/  "install_name_tool -id ${prefix}/lib/libcxx/libc++.1.0.dylib libc++.1.0.dylib"
-    system -W  ${destroot}${prefix}/lib/libcxx/  "install_name_tool -delete_rpath @loader_path/../lib libc++.1.0.dylib"
+    # LLVM 18's libc++ may not have rpaths to delete
+    catch {system -W  ${destroot}${prefix}/lib/libcxx/  "install_name_tool -delete_rpath @loader_path/../lib libc++.1.0.dylib"}
     system -W  ${destroot}${prefix}/lib/libcxx/  "install_name_tool -change @rpath/libc++abi.1.dylib ${prefix}/lib/libcxx/libc++abi.1.dylib libc++.1.0.dylib"
     system -W  ${destroot}${prefix}/lib/libcxx/  "ln -s libc++.1.0.dylib libc++.1.dylib"
     system -W  ${destroot}${prefix}/lib/libcxx/  "ln -s libc++.1.dylib libc++.dylib"
 
-    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++abi.1.0.dylib ${destroot}${prefix}/lib/libcxx/libc++abi.1.0.dylib
+    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++/libc++abi.1.0.dylib ${destroot}${prefix}/lib/libcxx/libc++abi.1.0.dylib
     system -W  ${destroot}${prefix}/lib/libcxx/  "install_name_tool -id ${prefix}/lib/libcxx/libc++abi.1.0.dylib libc++abi.1.0.dylib"
-    system -W  ${destroot}${prefix}/lib/libcxx/  "install_name_tool -delete_rpath @loader_path/../lib libc++abi.1.0.dylib"
+    # LLVM 18's libc++abi may not have rpaths to delete
+    catch {system -W  ${destroot}${prefix}/lib/libcxx/  "install_name_tool -delete_rpath @loader_path/../lib libc++abi.1.0.dylib"}
     system -W  ${destroot}${prefix}/lib/libcxx/  "ln -s libc++abi.1.0.dylib libc++abi.1.dylib"
     system -W  ${destroot}${prefix}/lib/libcxx/  "ln -s libc++abi.1.dylib libc++abi.dylib"
 
-    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++.a ${destroot}${prefix}/lib/libcxx/libc++.a
-    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++abi.a ${destroot}${prefix}/lib/libcxx/libc++abi.a
-    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++experimental.a ${destroot}${prefix}/lib/libcxx/libc++experimental.a
+    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++/libc++.a ${destroot}${prefix}/lib/libcxx/libc++.a
+    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++/libc++abi.a ${destroot}${prefix}/lib/libcxx/libc++abi.a
+    copy  ${prefix}/libexec/llvm-${clangversion}/lib/libc++/libc++experimental.a ${destroot}${prefix}/lib/libcxx/libc++experimental.a
 
 }
 

@Wowfunhappy hi, did you ever figure out how to fix the issue with the forced link to libunwind (https://trac.macports.org/ticket/74318)?

@aeiouaeiouaeiouaeiouaeiouaeiou No, I think I must have never run into that? But I only used this to build https://github.com/Wowfunhappy/Node-24-Mavericks, in a virtual machine that I did not use for anything else, so not very much of the MacPorts ecosystem was exercised.

@Wowfunhappy in that Node.js build script, I see a reference to libc++ located in /opt/local/libexec/*, so everything ran without errors.
There's I see that files are being copied to /opt/local/lib/*, and because of the dependency on libunwind.1.dylib, the libc++ library cannot be used in a location other than the default one (I tried removing it, but that didn't help).
I'm asking because this issue has left me stuck using LLVM 16 in macports-libcxx, but I can't build Ladybug without libc++ from LLVM 18.

@aeiouaeiouaeiouaeiouaeiouaeiou Sorry, I don't know!

@aeiouaeiouaeiouaeiouaeiouaeiou Also, it looks like you're on 10.8? I'm on 10.9.