Hi Rainer, Sean did indeed add the default_variants to the compilers portgroup in the last month or two. Perhaps you were trying before then.
David On Thu, Feb 26, 2015 at 9:30 AM, Rainer Müller <[email protected]> wrote: > On 2015-02-26 14:22, Artur Szostak wrote: > > Let me rephrase: Assuming I have to use gcc rather than clang. What > > is the standard/best way to do that in a Portfile? > > > > I have a numerical code that gives inferior results with clang > > compared to gcc. Thus, I need to make sure the port uses GCC. Also, > > the code is C99, so that should mitigate any ABI issues. > > Starting with Xcode 6, there are only clang and macports-clang-* in the > default list of usable compilers. To use gcc you explicitly need to > whitelist it. > > The simplest and least flexible would be to just use a specific version > of gcc: > > configure.compiler macports-gcc-4.9 > > > To be more flexible, you can also create variants that allow to choose > the version of gcc with +gcc49, +gcc48, etc: > > variant gcc47 description {Build with MacPorts gcc 4.7 compiler} > conflicts gcc48 gcc49 { > configure.compiler macports-gcc-4.7 > } > > variant gcc48 description {Build with MacPorts gcc 4.8 compiler} > conflicts gcc47 gcc49 { > configure.compiler macports-gcc-4.8 > } > > variant gcc49 description {Build with MacPorts gcc 4.9 compiler} > conflicts gcc47 gcc48 { > configure.compiler macports-gcc-4.9 > } > > if {![variant_isset gcc47] && ![variant_isset gcc48] && ![variant_isset > gcc49]} { > default_variants +gcc49 > } > > > Recently, there was also a new compilers port group added to the ports > tree which is supposed to generate these variants automatically. > However, as far as I was able to test it, it does not automatically > handle the selection of a default compiler yet as shown in the example > above using the variant_isset conditionals, so you still need to add > that. Manually adding this would make the construct a bit fragile as > new versions will be added to the port group in the future. > > compilers.choose cc cpp > compilers.setup -clang -llvm -dragonegg > default_variants +gcc49 > > @Sean, David: did I do something wrong or is automatic selection just > not supported yet by the compilers port group? > > Rainer >
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