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Annotation of wikisrc/tutorials/clang.mdwn, revision 1.4

1.3       wiz         1: This page explains how to use clang with the NetBSD base system.
1.2       gdt         2: See also [how to use clang to build packages](../pkgsrc/clang/).
1.1       gdt         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: # Not building gcc
                     35: 
                     36: On a system that builds clang and uses it to build the base system,
                     37: you can refrain from building gcc, by additionally adding:
                     38: 
                     39:     MKGCC=no
1.4     ! gdt        40: 
        !            41: # status
        !            42: 
        !            43: On NetBSD-current, clang builds successfully on several architectures.
        !            44: These builds are with all three of the above flags enabled.
        !            45: 
        !            46: https://releng.netbsd.org/builds/HEAD-llvm/