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version 1.3, 2017/12/31 13:52:57 version 1.6, 2018/11/07 06:48:32
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 This page explains how to use clang with the NetBSD base system.  This page explains how to use clang with the NetBSD base system.
 See also [how to use clang to build packages](../pkgsrc/clang/).  See also [how to use clang to build packages](../pkgsrc/clang/).
   
 \todo: review this entire page.  
   
 Since NetBSD 6, the base system has included clang, but it is not  Since NetBSD 6, the base system has included clang, but it is not
 built or used by default.  built or used by default. To use it, set in mk.conf
   
 \todo Explain if there are or aren't plans to enable it by default, or  
 to switch, keeping in mind that compiler support varies by architecture.  
   
 There are three steps that can be taken with clang; each depends on the previous.  
   
 # Building clang  
   
 To build clang as part of the build, set  
   
       MKGCC=no
     MKLLVM=yes      MKLLVM=yes
       HAVE_LLVM=yes
       CLANGBASE=/usr
   
 in mk.conf before running "build.sh release".  And run "build.sh release". This will apply for both pkgsrc and base.
   
 This will build clang, which will appear in /usr/bin/clang and also  
 build libraries that clang needs.  NetBSD itself will not be built  
 with clang, but you will be able to use clang to build programs.  
   
 # Using clang to build the NetBSD base system  This will work on ARM, PowerPC, x86, and possibly SPARC64.
   
 In addition, set  # Explanation
   
     HAVE_LLVM=yes  MKGCC=no                needed as building GCC alongside is not maintained.  
   MKLLVM=yes              builds LLVM libraries.  
   HAVE_LLVM=yes           controls clang being built  
   CLANGBASE=/usr          instructs pkgsrc where to look for the compiler
   
 to cause clang to be used instead of gcc.  # status
   
 # Not building gcc  On NetBSD-current, clang builds successfully on several architectures.
   These builds are with all three of the above flags enabled.
   
 On a system that builds clang and uses it to build the base system,  https://releng.netbsd.org/builds/HEAD-llvm/
 you can refrain from building gcc, by additionally adding:  
   
     MKGCC=no  
Removed from v.1.3  
changed lines
  Added in v.1.6

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