llvmPackages: use libcxxrt on FreeBSD

FreeBSD doesn't use LLVM's cxxabi implementation, for backwards
compatibility reasons.  Software expects the libcxxrt API when
building on FreeBSD.  This fixes the build of
pkgsCross.x86_64-freebsd.boost.

pkgs/build-support/cc-wrapper/default.nix

@@ -372,11 +372,11 @@ stdenv.mkDerivation {
         echo "-isystem $dir" >> $out/nix-support/libcxx-cxxflags
       done
     ''
-    + optionalString (libcxx.isLLVM or false) (''
+    + optionalString (libcxx.isLLVM or false) ''
       echo "-isystem ${lib.getDev libcxx}/include/c++/v1" >> $out/nix-support/libcxx-cxxflags
       echo "-stdlib=libc++" >> $out/nix-support/libcxx-ldflags
-      echo "-lc++abi" >> $out/nix-support/libcxx-ldflags
+      echo "-l${libcxx.cxxabi.libName}" >> $out/nix-support/libcxx-ldflags
-    '')
+    ''
 
     ##
     ## Initial CFLAGS

pkgs/development/compilers/llvm/10/default.nix

@@ -110,7 +110,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -147,7 +147,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/10/libcxx/default.nix

@@ -1,7 +1,11 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, python3, libcxxabi, fixDarwinDylibNames, version
+{ lib, stdenv, llvm_meta, fetch, cmake, python3, fixDarwinDylibNames, version
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation {
   pname = "libcxx";
   inherit version;
@@ -37,13 +41,13 @@ stdenv.mkDerivation {
     ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) python3
     ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ libcxxabi ];
+  buildInputs = [ cxxabi ];
 
   cmakeFlags = [
-    "-DLIBCXX_LIBCXXABI_LIB_PATH=${libcxxabi}/lib"
     "-DLIBCXX_LIBCPPABI_VERSION=2"
-    "-DLIBCXX_CXX_ABI=libcxxabi"
+    "-DLIBCXX_CXX_ABI=${cxxabi.pname}"
   ] ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
+    ++ lib.optional (cxxabi.pname == "libcxxabi") "-DLIBCXX_LIBCXXABI_LIB_PATH=${cxxabi}/lib"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optionals stdenv.hostPlatform.isWasm [
       "-DLIBCXX_ENABLE_THREADS=OFF"
@@ -60,13 +64,14 @@ stdenv.mkDerivation {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/10/libcxxabi/default.nix

@@ -67,6 +67,10 @@ stdenv.mkDerivation {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/11/default.nix

@@ -125,7 +125,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -162,7 +162,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/11/libcxx/default.nix

@@ -1,7 +1,11 @@
-{ lib, stdenv, llvm_meta, fetch, fetchpatch, cmake, python3, libcxxabi, llvm, fixDarwinDylibNames, version
+{ lib, stdenv, llvm_meta, fetch, fetchpatch, cmake, python3, llvm, fixDarwinDylibNames, version
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation {
   pname = "libcxx";
   inherit version;
@@ -42,10 +46,10 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake python3 ]
     ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ libcxxabi ];
+  buildInputs = [ cxxabi ];
 
   cmakeFlags = [
-    "-DLIBCXX_CXX_ABI=libcxxabi"
+    "-DLIBCXX_CXX_ABI=${cxxabi.pname}"
   ] ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optionals stdenv.hostPlatform.isWasm [
@@ -76,13 +80,14 @@ stdenv.mkDerivation {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/11/libcxxabi/default.nix

@@ -71,6 +71,10 @@ stdenv.mkDerivation {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/12/default.nix

@@ -113,7 +113,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -154,7 +154,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/12/libcxx/default.nix

@@ -1,7 +1,11 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, python3, libcxxabi, llvm, fixDarwinDylibNames, version
+{ lib, stdenv, llvm_meta, fetch, cmake, python3, llvm, fixDarwinDylibNames, version
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation {
   pname = "libcxx";
   inherit version;
@@ -30,10 +34,10 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ cmake python3 ]
     ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ libcxxabi ];
+  buildInputs = [ cxxabi ];
 
   cmakeFlags = [
-    "-DLIBCXX_CXX_ABI=libcxxabi"
+    "-DLIBCXX_CXX_ABI=${cxxabi.pname}"
   ] ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optionals stdenv.hostPlatform.isWasm [
@@ -51,13 +55,14 @@ stdenv.mkDerivation {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/12/libcxxabi/default.nix

@@ -69,6 +69,10 @@ stdenv.mkDerivation {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/13/default.nix

@@ -114,7 +114,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -154,7 +154,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/13/libcxx/default.nix

@@ -1,5 +1,6 @@
 { lib, stdenv, llvm_meta, src, cmake, python3, fixDarwinDylibNames, version
-, libcxxabi
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 
 # If headersOnly is true, the resulting package would only include the headers.
@@ -10,6 +11,8 @@
 , headersOnly ? false
 }:
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation rec {
   pname = if headersOnly then "cxx-headers" else "libcxx";
   inherit version;
@@ -32,9 +35,9 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake python3 ]
     ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
-  buildInputs = lib.optionals (!headersOnly) [ libcxxabi ];
+  buildInputs = lib.optionals (!headersOnly) [ cxxabi ];
 
-  cmakeFlags = [ "-DLIBCXX_CXX_ABI=libcxxabi" ]
+  cmakeFlags = [ "-DLIBCXX_CXX_ABI=${cxxabi.pname}" ]
     ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optionals stdenv.hostPlatform.isWasm [
@@ -55,7 +58,7 @@ stdenv.mkDerivation rec {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
@@ -71,6 +74,7 @@ stdenv.mkDerivation rec {
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/13/libcxxabi/default.nix

@@ -66,6 +66,10 @@ stdenv.mkDerivation rec {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/14/default.nix

@@ -114,7 +114,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -154,7 +154,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/14/libcxx/default.nix

@@ -1,7 +1,8 @@
 { lib, stdenv, llvm_meta
 , monorepoSrc, runCommand
 , cmake, python3, fixDarwinDylibNames, version
-, libcxxabi
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 
 # If headersOnly is true, the resulting package would only include the headers.
@@ -16,6 +17,8 @@ let
   basename = "libcxx";
 in
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation rec {
   pname = basename + lib.optionalString headersOnly "-headers";
   inherit version;
@@ -48,9 +51,9 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake python3 ]
     ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
-  buildInputs = lib.optionals (!headersOnly) [ libcxxabi ];
+  buildInputs = lib.optionals (!headersOnly) [ cxxabi ];
 
-  cmakeFlags = [ "-DLIBCXX_CXX_ABI=libcxxabi" ]
+  cmakeFlags = [ "-DLIBCXX_CXX_ABI=${cxxabi.pname}" ]
     ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optionals stdenv.hostPlatform.isWasm [
@@ -71,13 +74,14 @@ stdenv.mkDerivation rec {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/14/libcxxabi/default.nix

@@ -85,6 +85,10 @@ stdenv.mkDerivation rec {
       ln -s libc++abi.so.1.0 $out/lib/libc++abi.so.1
     '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/5/default.nix

@@ -86,7 +86,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;

pkgs/development/compilers/llvm/5/libcxx/default.nix

@@ -1,4 +1,9 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, python3, libcxxabi, fixDarwinDylibNames, version }:
+{ lib, stdenv, llvm_meta, fetch, cmake, python3, fixDarwinDylibNames, version
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
+}:
+
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
 
 stdenv.mkDerivation {
   pname = "libcxx";
@@ -33,13 +38,13 @@ stdenv.mkDerivation {
     ++ lib.optional stdenv.hostPlatform.isMusl python3
     ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ libcxxabi ];
+  buildInputs = [ cxxabi ];
 
   cmakeFlags = [
-    "-DLIBCXX_LIBCXXABI_LIB_PATH=${libcxxabi}/lib"
     "-DLIBCXX_LIBCPPABI_VERSION=2"
-    "-DLIBCXX_CXX_ABI=libcxxabi"
+    "-DLIBCXX_CXX_ABI=${cxxabi.pname}"
-  ] ++ lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1";
+  ] ++ lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1"
+    ++ lib.optional (cxxabi.pname == "libcxxabi") "-DLIBCXX_LIBCXXABI_LIB_PATH=${cxxabi}/lib";
 
   preInstall = lib.optionalString (stdenv.isDarwin) ''
     for file in lib/*.dylib; do
@@ -50,13 +55,14 @@ stdenv.mkDerivation {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/5/libcxxabi/default.nix

@@ -52,6 +52,10 @@ stdenv.mkDerivation {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/6/default.nix

@@ -87,7 +87,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;

pkgs/development/compilers/llvm/6/libcxx/default.nix

@@ -1,4 +1,9 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, python3, libcxxabi, fixDarwinDylibNames, version }:
+{ lib, stdenv, llvm_meta, fetch, cmake, python3, fixDarwinDylibNames, version
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
+}:
+
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
 
 stdenv.mkDerivation {
   pname = "libcxx";
@@ -39,13 +44,13 @@ stdenv.mkDerivation {
     ++ lib.optional stdenv.hostPlatform.isMusl python3
     ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ libcxxabi ];
+  buildInputs = [ cxxabi ];
 
   cmakeFlags = [
-    "-DLIBCXX_LIBCXXABI_LIB_PATH=${libcxxabi}/lib"
     "-DLIBCXX_LIBCPPABI_VERSION=2"
-    "-DLIBCXX_CXX_ABI=libcxxabi"
+    "-DLIBCXX_CXX_ABI=${cxxabi.pname}"
-  ] ++ lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1";
+  ] ++ lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1"
+    ++ lib.optional (cxxabi.pname == "libcxxabi") "-DLIBCXX_LIBCXXABI_LIB_PATH=${cxxabi}/lib";
 
   preInstall = lib.optionalString (stdenv.isDarwin) ''
     for file in lib/*.dylib; do
@@ -56,13 +61,14 @@ stdenv.mkDerivation {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/6/libcxxabi/default.nix

@@ -52,6 +52,10 @@ stdenv.mkDerivation {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/7/default.nix

@@ -117,7 +117,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -154,7 +154,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/7/libcxx/default.nix

@@ -1,7 +1,11 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, python3, libcxxabi, fixDarwinDylibNames, version
+{ lib, stdenv, llvm_meta, fetch, cmake, python3, fixDarwinDylibNames, version
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation {
   pname = "libcxx";
   inherit version;
@@ -42,13 +46,13 @@ stdenv.mkDerivation {
     ++ lib.optional stdenv.hostPlatform.isMusl python3
     ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ libcxxabi ];
+  buildInputs = [ cxxabi ];
 
   cmakeFlags = [
-    "-DLIBCXX_LIBCXXABI_LIB_PATH=${libcxxabi}/lib"
     "-DLIBCXX_LIBCPPABI_VERSION=2"
-    "-DLIBCXX_CXX_ABI=libcxxabi"
+    "-DLIBCXX_CXX_ABI=${cxxabi.pname}"
   ] ++ lib.optional stdenv.hostPlatform.isMusl "-DLIBCXX_HAS_MUSL_LIBC=1"
+    ++ lib.optional (cxxabi.pname == "libcxxabi") "-DLIBCXX_LIBCXXABI_LIB_PATH=${cxxabi}/lib"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optional (!enableShared) "-DLIBCXX_ENABLE_SHARED=OFF" ;
 
@@ -61,13 +65,14 @@ stdenv.mkDerivation {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/7/libcxxabi/default.nix

@@ -71,6 +71,10 @@ stdenv.mkDerivation {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/8/default.nix

@@ -118,7 +118,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -155,7 +155,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/8/libcxx/default.nix

@@ -1,7 +1,11 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, python3, libcxxabi, fixDarwinDylibNames, version
+{ lib, stdenv, llvm_meta, fetch, cmake, python3, fixDarwinDylibNames, version
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation {
   pname = "libcxx";
   inherit version;
@@ -41,13 +45,13 @@ stdenv.mkDerivation {
     ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) python3
     ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ libcxxabi ];
+  buildInputs = [ cxxabi ];
 
   cmakeFlags = [
-    "-DLIBCXX_LIBCXXABI_LIB_PATH=${libcxxabi}/lib"
     "-DLIBCXX_LIBCPPABI_VERSION=2"
-    "-DLIBCXX_CXX_ABI=libcxxabi"
+    "-DLIBCXX_CXX_ABI=${cxxabi.pname}"
   ] ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
+    ++ lib.optional (cxxabi.pname == "libcxxabi") "-DLIBCXX_LIBCXXABI_LIB_PATH=${cxxabi}/lib"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optionals stdenv.hostPlatform.isWasm [
       "-DLIBCXX_ENABLE_THREADS=OFF"
@@ -64,13 +68,14 @@ stdenv.mkDerivation {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/8/libcxxabi/default.nix

@@ -67,6 +67,10 @@ stdenv.mkDerivation {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/9/default.nix

@@ -118,7 +118,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -155,7 +155,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/9/libcxx/default.nix

@@ -1,7 +1,11 @@
-{ lib, stdenv, llvm_meta, fetch, cmake, python3, libcxxabi, fixDarwinDylibNames, version
+{ lib, stdenv, llvm_meta, fetch, cmake, python3, fixDarwinDylibNames, version
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 }:
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation {
   pname = "libcxx";
   inherit version;
@@ -37,13 +41,13 @@ stdenv.mkDerivation {
     ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) python3
     ++ lib.optional stdenv.hostPlatform.isDarwin fixDarwinDylibNames;
 
-  buildInputs = [ libcxxabi ];
+  buildInputs = [ cxxabi ];
 
   cmakeFlags = [
-    "-DLIBCXX_LIBCXXABI_LIB_PATH=${libcxxabi}/lib"
     "-DLIBCXX_LIBCPPABI_VERSION=2"
-    "-DLIBCXX_CXX_ABI=libcxxabi"
+    "-DLIBCXX_CXX_ABI=${cxxabi.pname}"
   ] ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
+    ++ lib.optional (cxxabi.pname == "libcxxabi") "-DLIBCXX_LIBCXXABI_LIB_PATH=${cxxabi}/lib"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optionals stdenv.hostPlatform.isWasm [
       "-DLIBCXX_ENABLE_THREADS=OFF"
@@ -60,13 +64,14 @@ stdenv.mkDerivation {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/9/libcxxabi/default.nix

@@ -67,6 +67,10 @@ stdenv.mkDerivation {
     install -m 644 ../include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/compilers/llvm/git/default.nix

@@ -113,7 +113,7 @@ let
       cc = tools.clang-unwrapped;
       libcxx = targetLlvmLibraries.libcxx;
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ];
       extraBuildCommands = mkExtraBuildCommands cc;
@@ -153,7 +153,7 @@ let
       libcxx = targetLlvmLibraries.libcxx;
       bintools = bintools';
       extraPackages = [
-        targetLlvmLibraries.libcxxabi
+        libcxx.cxxabi
         targetLlvmLibraries.compiler-rt
       ] ++ lib.optionals (!stdenv.targetPlatform.isWasm) [
         targetLlvmLibraries.libunwind

pkgs/development/compilers/llvm/git/libcxx/default.nix

@@ -1,7 +1,8 @@
 { lib, stdenv, llvm_meta
 , monorepoSrc, runCommand
 , cmake, python3, fixDarwinDylibNames, version
-, libcxxabi
+, cxxabi ? if stdenv.hostPlatform.isFreeBSD then libcxxrt else libcxxabi
+, libcxxabi, libcxxrt
 , enableShared ? !stdenv.hostPlatform.isStatic
 
 # If headersOnly is true, the resulting package would only include the headers.
@@ -16,6 +17,8 @@ let
   basename = "libcxx";
 in
 
+assert stdenv.isDarwin -> cxxabi.pname == "libcxxabi";
+
 stdenv.mkDerivation rec {
   pname = basename + lib.optionalString headersOnly "-headers";
   inherit version;
@@ -59,12 +62,12 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ cmake python3 ]
     ++ lib.optional stdenv.isDarwin fixDarwinDylibNames;
 
-  buildInputs = lib.optionals (!headersOnly) [ libcxxabi ];
+  buildInputs = lib.optionals (!headersOnly) [ cxxabi ];
 
   cmakeFlags = [
     "-DLLVM_ENABLE_RUNTIMES=libcxx"
-    "-DLIBCXX_CXX_ABI=${lib.optionalString (!headersOnly) "system-"}libcxxabi"
+    "-DLIBCXX_CXX_ABI=${lib.optionalString (!headersOnly) "system-"}${cxxabi.pname}"
-  ] ++ lib.optional (!headersOnly) "-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${libcxxabi.dev}/include/c++/v1"
+  ] ++ lib.optional (!headersOnly && cxxabi.pname == "libcxxabi") "-DLIBCXX_CXX_ABI_INCLUDE_PATHS=${cxxabi.dev}/include/c++/v1"
     ++ lib.optional (stdenv.hostPlatform.isMusl || stdenv.hostPlatform.isWasi) "-DLIBCXX_HAS_MUSL_LIBC=1"
     ++ lib.optional (stdenv.hostPlatform.useLLVM or false) "-DLIBCXX_USE_COMPILER_RT=ON"
     ++ lib.optionals stdenv.hostPlatform.isWasm [
@@ -85,13 +88,14 @@ stdenv.mkDerivation rec {
       abiName=$(echo "$baseName" | sed -e 's/libc++/libc++abi/')
 
       for other in $(${stdenv.cc.targetPrefix}otool -L $file | awk '$1 ~ "/libc\\+\\+abi" { print $1 }'); do
-        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${libcxxabi}/lib/$abiName $file
+        ${stdenv.cc.targetPrefix}install_name_tool -change $other ${cxxabi}/lib/$abiName $file
       done
     done
   '';
 
   passthru = {
     isLLVM = true;
+    inherit cxxabi;
   };
 
   meta = llvm_meta // {

pkgs/development/compilers/llvm/git/libcxxabi/default.nix

@@ -95,6 +95,10 @@ stdenv.mkDerivation rec {
     install -m 644 ../../${pname}/include/${if stdenv.isDarwin then "*" else "cxxabi.h"} "$dev/include"
   '';
 
+  passthru = {
+    libName = "c++abi";
+  };
+
   meta = llvm_meta // {
     homepage = "https://libcxxabi.llvm.org/";
     description = "Provides C++ standard library support";

pkgs/development/libraries/libcxxrt/default.nix

@@ -20,6 +20,7 @@ stdenv.mkDerivation {
   '';
 
   passthru = {
+    libName = "cxxrt";
     updateScript = unstableGitUpdater { };
   };
 

pkgs/stdenv/darwin/default.nix

@@ -339,6 +339,7 @@ rec {
           '';
           passthru = {
             isLLVM = true;
+            cxxabi = self."${finalLlvmPackages}".libcxxabi;
           };
         };
 
@@ -348,6 +349,9 @@ rec {
             mkdir -p $out/lib
             ln -s ${bootstrapTools}/lib/libc++abi.dylib $out/lib/libc++abi.dylib
           '';
+          passthru = {
+            libName = "c++abi";
+          };
         };
 
         compiler-rt = stdenv.mkDerivation {