x265 @1.7 fails building using llvm-gcc-4.2 on 10.6.8

[udbraumann]

As I have XCode 4.2 installed on my Snow Leopard 64 bit system, the preset compiler is llvm-gcc-4.2. While building x265 the compiler crashes at this point>

...
:info:build /opt/local/bin/cmake -E cmake_progress_report /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_x265/x265/work/build/CMakeFiles 16
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_x265/x265/work/x265_1.7/source/encoder/analysis.cpp: In member function ‘void x265::Analysis::checkBidir2Nx2N(x265::Mode&, x265::Mode&, const x265::CUGeom&)’:
:info:build /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_ports_multimedia_x265/x265/work/x265_1.7/source/encoder/analysis.cpp:1553: internal compiler error: Segmentation fault
:info:build Please submit a full bug report,
:info:build with preprocessed source if appropriate.
:info:build See <URL:http://developer.apple.com/bugreporter> for instructions.
:info:build make[2]: *** [encoder/CMakeFiles/encoder.dir/analysis.cpp.o] Error 1
...

As building using the call

sudo port install x265 configure.compiler=gcc-4.2

has worked fine, I propose to blacklist llvm-gcc-4.2.

[ays388@…]

Agreed. Here is a patch that does it.

[ays388@…]

Blacklist llvm-gcc-4.2, as it crashes during build

[udbraumann]

Thanks, after blacklisting llvm-gcc-4.2 now it automatically selects /usr/bin/clang, (version 3.0, apparently it was also shipped with Xcode 4.2), which had no problems to build x265 @1.7. Don't know what happens on other 10.6.8 platforms using Xcode 3.2.6.

[dbevans (David B. Evans)]

Apple clang 3.0 was introduced in Xcode 4.2. Earlier versions of clang are often found to be problematic and can be blacklisted by version using the compiler_blacklist_versions portgroup

PortGroup compiler_blacklist_versions 1.0
...
compiler.blacklist  *llvm-gcc-4.2 {clang < 300}

or such depending on what testing with earlier Xcode versions reveals.

See XcodeVersionInfo for details of what compilers are available by OS X and Xcode version.

Which compilers are selected after black listing is determined by compiler.fallback, the default values of which are set based on Xcode version. See code in base/src/port1.0/portconfigure.tcl​ for details.

[dbevans (David B. Evans)]

Patch committed in r138603.