qt5 build dependency on clang

[Ken Cunningham]

> On Apr 22, 2017, at 11:56 AM, db <iamsudo at gmail.com> wrote:
> 
> On a 10.8.5-system with default compiler qt5 @5.7.1 and qt56 @5.6.2 require clang-4.0 to build, while another whose compiler is set to clang-3.9 shows this as dependency. Can anyone confirm the former?


The clang-4.0 dependency on a stock unmodified 10.8.5 system comes from the cxx11 1.1 portgroup being include in qt5, which whitelists this compiler for you.

if {${cxx_stdlib} eq "libstdc++" } {

    compiler.blacklist-append   {macports-clang-3.[0-8]} clang

    compiler.whitelist-append  \
        macports-clang-4.0     \



The full file is here:
/opt/macports-ports/_resources/port1.0/group/cxx11-1.1.tcl


For your other situation where the cxx_stdlib has been set to libc++, this whitelisting will not be forced, and you’ll go back to default to clang-3.9, which has been set in your macports.conf default_compilers setting.

Best,

Ken
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