File:  [NetBSD Developer Wiki] / wikisrc / tutorials / clang.mdwn
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Sat Dec 30 18:34:03 2017 UTC (2 years, 7 months ago) by gdt
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move clang page to tutorials

    1: This page explainsse how to use clang with the NetBSD base system.
    2: See also [how to use clang to build packages](tutorials/pkgsrc/clang/).
    3: 
    4: \todo: review this entire page.
    5: 
    6: Since NetBSD 6, the base system has included clang, but it is not
    7: built or used by default.
    8: 
    9: \todo Explain if there are or aren't plans to enable it by default, or
   10: to switch, keeping in mind that compiler support varies by architecture.
   11: 
   12: There are three steps that can be taken with clang; each depends on the previous.
   13: 
   14: # Building clang
   15: 
   16: To build clang as part of the build, set
   17: 
   18:     MKLLVM=yes
   19: 
   20: in mk.conf before running "build.sh release".
   21: 
   22: This will build clang, which will appear in /usr/bin/clang and also
   23: build libraries that clang needs.  NetBSD itself will not be built
   24: with clang, but you will be able to use clang to build programs.
   25: 
   26: # Using clang to build the NetBSD base system
   27: 
   28: In addition, set
   29: 
   30:     HAVE_LLVM=yes
   31: 
   32: to cause clang to be used instead of gcc.
   33: 
   34: \todo It is not 100% clear if this stage works, vs having to set
   35: MKGCC=no also.
   36: 
   37: # Not building gcc
   38: 
   39: On a system that builds clang and uses it to build the base system,
   40: you can refrain from building gcc, by additionally adding:
   41: 
   42:     MKGCC=no

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