[126852] trunk/dports/devel/mpfr/Portfile

[Ryan Schmidt]

> On Oct 16, 2014, at 9:24 AM, davidnichols at macports.org wrote:
> 
> Revision
> 126852
> Author
> davidnichols at macports.org
> Date
> 2014-10-16 07:24:39 -0700 (Thu, 16 Oct 2014)
> Log Message
> 
> blacklisted the Xcode 4.2 compiler so that the mpfr lib can be build with threading enabled and therefore programs (such as Qore) that require a thread-safe mpfr library no longer assert() and otherwise crash due to threading issues with the mpfr library
> Modified Paths
> 
> 	• trunk/dports/devel/mpfr/Portfile
> Diff
> 
> Modified: trunk/dports/devel/mpfr/Portfile (126851 => 126852)

> @@ -84,8 +85,10 @@
>  
>  # Due to radr://10291355 (llvm.org PR11111), the new tls support enabled in clang with Xcode 4.2
>  # miscompiles mpfr. While this was fixed in Xcode 4.2.1, as the ttls support was never used prior to
> -# Xcode 4.2, the generic fix is to pass --disable-thread-safe to configure.
> -configure.args      --disable-thread-safe
> +# Xcode 4.2, the generic fix is to pass --disable-thread-safe to configure, however this will break
> +# any project that requires a thread-safe mpfr library, therefore the Xcode 4.2 compiler is
> +# blacklisted here
> +compiler.blacklist *llvm-gcc-4.2

I'm not sure I understand the reference to "the Xcode 4.2 compiler" here. Xcode 4.2, like Xcode versions before it, comes with more than one compiler. llvm-gcc-4.2 is one of them, but it also includes clang; clang is the default even. So if the problem is, as the comment states, that Xcode 4.2's clang miscompiles mpfr, then you need to use the compiler_blacklist_versions portgroup to blacklist Xcode 4.2's version of clang.