libunwind: Fix build against compiler-rt-using clang

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

@@ -17,6 +17,7 @@
 , isGNU ? false, isClang ? cc.isClang or false, gnugrep ? null
 , buildPackages ? {}
 , libcxx ? null
+, isCompilerRT ? false
 }:
 
 with lib;
@@ -145,7 +146,7 @@ stdenv.mkDerivation {
     # Binutils, and Apple's "cctools"; "bintools" as an attempt to find an
     # unused middle-ground name that evokes both.
     inherit bintools;
-    inherit libc nativeTools nativeLibc nativePrefix isGNU isClang;
+    inherit libc nativeTools nativeLibc nativePrefix isGNU isClang isCompilerRT;
 
     emacsBufferSetup = pkgs: ''
       ; We should handle propagation here too

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

@@ -168,6 +168,7 @@ let
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoLibcxx = wrapCCWith rec {
@@ -182,6 +183,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
         echo "-nostdlib++" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoLibc = wrapCCWith rec {
@@ -195,6 +197,7 @@ let
         echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoCompilerRt = wrapCCWith rec {

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

@@ -17,7 +17,9 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
-  cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
+  cmakeFlags =
+     lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF"
+  ++ lib.optional (stdenv.cc.isCompilerRT) "-DLIBUNWIND_USE_COMPILER_RT=TRUE";
 
   meta = llvm_meta // {
     # Details: https://github.com/llvm/llvm-project/blob/main/libunwind/docs/index.rst

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

@@ -168,6 +168,7 @@ let
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoLibcxx = wrapCCWith rec {
@@ -182,6 +183,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
         echo "-nostdlib++" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoLibc = wrapCCWith rec {
@@ -195,6 +197,7 @@ let
         echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoCompilerRt = wrapCCWith rec {

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

@@ -31,7 +31,9 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
-  cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
+  cmakeFlags =
+     lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF"
+  ++ lib.optional (stdenv.cc.isCompilerRT) "-DLIBUNWIND_USE_COMPILER_RT=TRUE";
 
   meta = llvm_meta // {
     # Details: https://github.com/llvm/llvm-project/blob/main/libunwind/docs/index.rst

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

@@ -168,6 +168,7 @@ let
       '' + lib.optionalString stdenv.targetPlatform.isWasm ''
         echo "-fno-exceptions" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoLibcxx = wrapCCWith rec {
@@ -182,6 +183,7 @@ let
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
         echo "-nostdlib++" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoLibc = wrapCCWith rec {
@@ -195,6 +197,7 @@ let
         echo "-rtlib=compiler-rt" >> $out/nix-support/cc-cflags
         echo "-B${targetLlvmLibraries.compiler-rt}/lib" >> $out/nix-support/cc-cflags
       '' + mkExtraBuildCommands cc;
+      isCompilerRT = true;
     };
 
     clangNoCompilerRt = wrapCCWith rec {

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

@@ -31,7 +31,9 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
-  cmakeFlags = lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF";
+  cmakeFlags =
+     lib.optional (!enableShared) "-DLIBUNWIND_ENABLE_SHARED=OFF"
+  ++ lib.optional stdenv.cc.isCompilerRT "-DLIBUNWIND_USE_COMPILER_RT=TRUE";
 
   meta = llvm_meta // {
     # Details: https://github.com/llvm/llvm-project/blob/main/libunwind/docs/index.rst