Brew: openblas failed to build on 10.13.6

[nadavrap]

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• [x] ran brew update and can still reproduce the problem?
• [x] ran brew doctor, fixed all issues and can still reproduce the problem?
• [x] ran brew gist-logs <formula> (where <formula> is the name of the formula that failed) and included the output link?
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To help us debug your issue please explain:

• What you were trying to do (and why)
  Updating openblas from 0.3.4 -> 0.3.5 as part of upgrading R from 3.5.2 -> 3.5.2_1
• What happened (include command output)
  Compilation errors:
  cc1: error: bad value ('penryn') for '-march=' switch cc1: note: valid arguments to '-march=' switch are: nocona core2 nehalem corei7 westmere sandybridge corei7-avx ivybridge core-avx-i haswell core-avx2 broadwell skylake skylake-avx512 cannonlake icelake-client icelake-server bonnell atom silvermont slm knl knm x86-64 eden-x2 nano nano-1000 nano-2000 nano-3000 nano-x2 eden-x4 nano-x4 k8 k8-sse3 opteron opteron-sse3 athlon64 athlon64-sse3 athlon-fx amdfam10 barcelona bdver1 bdver2 bdver3 bdver4 znver1 btver1 btver2 native cc1: error: bad value ('penryn') for '-march=' switch cc1: note: valid arguments to '-march=' switch are: nocona core2 nehalem corei7 westmere sandybridge corei7-avx ivybridge core-avx-i haswell core-avx2 broadwell skylake skylake-avx512 cannonlake icelake-client icelake-server bonnell atom silvermont slm knl knm x86-64 eden-x2 nano nano-1000 nano-2000 nano-3000 nano-x2 eden-x4 nano-x4 k8 k8-sse3 opteron opteron-sse3 athlon64 athlon64-sse3 athlon-fx amdfam10 barcelona bdver1 bdver2 bdver3 bdver4 znver1 btver1 btver2 native make: *** [getarch] Error 1 Makefile.system:201: Makefile.conf: No such file or directory Makefile.system:1069: Makefile.: No such file or directory make: *** No rule to make targetMakefile.'. Stop.
  `

• What you expected to happen
  Successful installation.
• Step-by-step reproduction instructions (by running brew install commands)
  brew upgrade openblas
  The failure.

See gist here

[fxcoudert]

Thanks for reporting this issue. The problem is that brew is passing -march=penryn to the compiler, but the compiler in this case is GCC 8 (latest version), which does not accept this flag.

gcc-8 called with: -DGEMM_MULTITHREAD_THRESHOLD=4 -DNO_PARALLEL_MAKE=0 -o getarch getarch.c cpuid.S
superenv added:    -pipe -w -Os -march=penryn -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -isystem/usr/local/include -isystem/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -isystem/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers -L/usr/local/lib -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/OpenGL.framework/Versions/Current/Libraries -Wl,-headerpad_max_install_names
superenv executed: gcc-8 -pipe -w -Os -march=penryn -DGEMM_MULTITHREAD_THRESHOLD=4 -DNO_PARALLEL_MAKE=0 -o getarch getarch.c cpuid.S -isysroot /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk --sysroot=/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk -isystem/usr/local/include -isystem/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/usr/include/libxml2 -isystem/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/OpenGL.framework/Versions/Current/Headers -L/usr/local/lib -L/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk/System/Library/Frameworks/OpenGL.framework/Versions/Current/Libraries -Wl,-headerpad_max_install_names

[MikeMcQuaid]

@fxcoudert @claui @sjackman Any idea what the closest GCC-supported equivalent is? Could either set this to that just for GCC, set to the same for both or remove the Penryn flag entirely and go back to Core 2.

[claui]

@MikeMcQuaid We should be able to use -march=core2, which I believe has the exact same effect as -march=penryn (source).

[sjackman]

Here's the relevant GCC docs:
https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html

‘core2’ Intel Core 2 CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3 and SSSE3 instruction set support.
‘nehalem’ Intel Nehalem CPU with 64-bit extensions, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2 and POPCNT instruction set support.