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.

3 files changed, 14 insertions, 6 deletions

diff --git a/pkgs/development/compilers/llvm/14/default.nix b/pkgs/development/compilers/llvm/14/default.nix
index 722603bb70628..5d14c2f5f933e 100644
--- a/pkgs/development/compilers/llvm/14/default.nix
+++ b/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
diff --git a/pkgs/development/compilers/llvm/14/libcxx/default.nix b/pkgs/development/compilers/llvm/14/libcxx/default.nix
index c623d41f92f61..3e42a8b1e43c7 100644
--- a/pkgs/development/compilers/llvm/14/libcxx/default.nix
+++ b/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 // {
diff --git a/pkgs/development/compilers/llvm/14/libcxxabi/default.nix b/pkgs/development/compilers/llvm/14/libcxxabi/default.nix
index 3be2f964abcd2..30cc34a8c0e6c 100644
--- a/pkgs/development/compilers/llvm/14/libcxxabi/default.nix
+++ b/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";