Dear experts,
my O2 build fails at GMP@v6.0.0 (on MacOS 10.15.6 (19G2021)).
According to the log it fails during configuration of GMP and can’t find a working compiler (?):
configure: error: could not find a working compiler, see config.log for details
Looking at the config file it seems like the symbol:
__builtin_alloca
is not available.
Both the log and the config file can be found here:
https://cernbox.cern.ch/index.php/s/BGld5zJ5iNg6QxN
During the O2 build Clang@llvmorg-10.0.1 was already built succesfully and my system gcc --version yields
Configured with: --prefix=/Applications/Xcode.app/Contents/Developer/usr --with-gxx-include-dir=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/usr/include/c++/4.2.1
Apple clang version 12.0.0 (clang-1200.0.32.2)
Target: x86_64-apple-darwin19.6.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
This problem started to appear after my XCode (Version 12.0 (12A7209)) and most likely also the commandline-tools were updated yesterday.
I already fully removed O2 and reinstalled from scratch but this did not help.
I would appreciate any help.
Thanks in advance,
Mario