osmocore: error: invalid cpu feature string for builtin

[ryandesign (Ryan Carsten Schmidt)]

Build failure on OS X 10.11 at least:

conv_acc.c:658:21: error: invalid cpu feature string for builtin
                ssse3_supported = __builtin_cpu_supports("ssse3");
                                  ^                      ~~~~~~~
1 error generated.
make[3]: *** [conv_acc.lo] Error 1

[michaelld (Michael Dickens)]

Hmmm ... no idea. Will boot up a buildbot on 10.11 & see if I can replicate the issue.

[michaelld (Michael Dickens)]

I have replicated this issue on 10.11 ... and it seems like only 10.11 Xcode clang for some reason. No issues with 10.9, 10.10, or 10.12+; just 10.11. Strange.

The issue is that the compiler (/usr/bin/clang++) accepts the "-mssse3" (and "-mavx2") flag without erroring out, but doesn't in fact support compiling with those features enabled even if the hardware does support them. They use standard GNU Autotools calls, so they should work ... and, clearly they do for the most part; just not on 10.11's Xcode clang LOL.

[kencu (Ken)]

Could it be a matter of telling Xcode to turn them on? <​https://pewpewthespells.com/blog/buildsettings.html#clang_x86_vector_instructions>

[michaelld (Michael Dickens)]

Probably not ... I need to tell autotools to be verbose so I can see the actual code being tested & then debug ...