Upgrade cctools unexpectedly failing

[Chris Jones]

On 08/10/2019 6:52 am, Ken Cunningham wrote:
>> I wonder if the SDK path is
>> baked into llvm-config-mp-7.0?
> 
> 
> Yep -- sheesh. Is there no end to this?
> 
> Ken
> 
> $ llvm-config-mp-7.0 --cflags
> -I/opt/universalnew/libexec/llvm-7.0/include -pipe -Os -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk -fPIC -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wmissing-field-initializers -pedantic -Wno-long-long -Wcovered-switch-default -Wdelete-non-virtual-dtor -Wstring-conversion -DNDEBUG -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS
> 


There seems to be a lack of rhyme or reason to what you get from 
llvm-config, as it appears to vary by OS and also clang version.

For instance, on 10.14 with 7.0 I see the same

MacVM1014 ~ > llvm-config-mp-7.0 --cflags
-I/opt/local/libexec/llvm-7.0/include -pipe -Os 
-isysroot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk 
-fPIC -Werror=date-time -Werror=unguarded-availability-new -Wall -Wextra 
-Wno-unused-parameter -Wwrite-strings -Wmissing-field-initializers 
-pedantic -Wno-long-long -Wcovered-switch-default 
-Wdelete-non-virtual-dtor -Wstring-conversion -DNDEBUG 
-D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS

whereas clang 8.0 on the same system gives,

MacVM1014 ~ > llvm-config-mp-8.0 --cflags
-I/opt/local/libexec/llvm-8.0/include  -D__STDC_CONSTANT_MACROS 
-D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS

which also does not see fully correct, for different reasons. Why so 
short compared to 7.0 ?

Also, clang 7.0 on mac 10.13 gives

Titan ~ > llvm-config-mp-7.0 --cflags
-I/opt/local/libexec/llvm-7.0/include -pipe -Os -fPIC -Werror=date-time 
-Werror=unguarded-availability-new -Wall -Wextra -Wno-unused-parameter 
-Wwrite-strings -Wmissing-field-initializers -pedantic -Wno-long-long 
-Wcovered-switch-default -Wdelete-non-virtual-dtor -Wstring-conversion 
-DNDEBUG -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS 
-D__STDC_LIMIT_MACROS


so there the SDK is seemingly not baked in..

Any idea then Ken why we get such different results from llvm-confg, 
depending on the OS or clang version ? Seems like something is not quite 
right here ....

Chris