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Re: Clang c++ include path

From: Ricardo Wurmus
Subject: Re: Clang c++ include path
Date: Mon, 28 Oct 2019 18:58:38 +0100
User-agent: mu4e 1.2.0; emacs 26.3

Hi Mathieu,

> When running clang on a c++ program, it cannot find c++ std libraries.
> That's because, those libraries path are hardcoded inside g++ compiler
> and clang cannot find them.

Does this patch help?

--8<---------------cut here---------------start------------->8---
diff --git a/gnu/packages/llvm.scm b/gnu/packages/llvm.scm
index 9efb4a4841..3c59e8d26d 100644
--- a/gnu/packages/llvm.scm
+++ b/gnu/packages/llvm.scm
@@ -204,7 +204,7 @@ compiler.  In LLVM this library is called \"compiler-rt\".")
                            (compiler-rt (assoc-ref inputs "clang-runtime")))
                        (case (string->number ,(version-major
-                         ((or 6 7)
+                         ((or 6 7 8)
                           ;; Link to libclang_rt files from clang-runtime.
                           (substitute* "lib/Driver/ToolChain.cpp"
@@ -363,16 +363,15 @@ requirements according to version 1.1 of the OpenCL 
               (file-name (string-append "libomp-" version ".tar.xz"))))
     (build-system cmake-build-system)
-    ;; XXX: Note this gets built with GCC because building with Clang itself
-    ;; fails (missing <atomic>, even when libcxx is added as an input.)
      '(#:configure-flags '("-DLIBOMP_USE_HWLOC=ON"
-                           "-DOPENMP_TEST_C_COMPILER=clang"
-                           "-DOPENMP_TEST_CXX_COMPILER=clang++")
+                           "-DCMAKE_C_COMPILER=clang"
+                           "-DCMAKE_CXX_COMPILER=clang++")
        #:test-target "check-libomptarget"))
      `(("clang" ,clang)
        ("llvm" ,llvm)
+       ("libcxx" ,libcxx)
        ("perl" ,perl)
        ("pkg-config" ,pkg-config)))
--8<---------------cut here---------------end--------------->8---


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