[R-SIG-Mac] bzip2 configure error

[Prof Brian Ripley]

On 29/08/2020 19:38, Duncan Murdoch wrote:
> I seem to have got past this error by reinstalling Xcode.  I'm not sure 
> what went wrong with the old install; I'm pretty sure I did an R-devel 
> build since installing Catalina.

This seems to come from a CLT update: my Catalina box updated to 12.0 
beta 5 overnight.  And that has defaulted the SDK to 11.0.

I wish they would not do that -- it is not the first time they have 
installed a beta CLT without asking and set the SDK for a future OS.

I have tweaked configure for R-devel and R-patched so they install, but 
likely the better answer for me is to downgrade the CLT to 11.5 or set 
an SDK.

> 
> Duncan Murdoch
> 
> On 28/08/2020 10:41 a.m., Duncan Murdoch wrote:
>> I'm trying to build R-devel in Catalina for the first time in a few
>> weeks, and configure is dying with this error:
>>
>>    checking whether bzip2 support suffices... configure: error: bzip2
>> library and headers are required
>>
>> I tried a Homebrew install of bzip2, and it didn't help.
>>
>> When I look in config.log, I see this:
>>
>>
>> configure:45424: checking if bzip2 version >= 1.0.6
>> configure:45452: gcc -o conftest  -g -O2 -I/usr/local/opt/libffi/include
>>    -L/usr/local/opt/libffi/lib conftest.c -lbz2 -lz -licucore -ldl -lm
>> -liconv >&5
>> conftest.c:250:11: warning: initializing 'char *' with an expression of
>> type 'const char *' discards qualifiers
>> [-Wincompatible-pointer-types-discards-qualifiers]
>>       char *ver = BZ2_bzlibVersion();
>>             ^     ~~~~~~~~~~~~~~~~~~
>> conftest.c:251:5: error: implicitly declaring library function 'exit'
>> with type 'void (int) __attribute__((noreturn))'
>> [-Werror,-Wimplicit-function-declaration]
>>       exit(strcmp(ver, "1.0.6") < 0);
>>       ^
>> conftest.c:251:5: note: include the header <stdlib.h> or explicitly
>> provide a declaration for 'exit'
>> conftest.c:251:10: error: implicitly declaring library function 'strcmp'
>> with type 'int (const char *, const char *)'
>> [-Werror,-Wimplicit-function-declaration]
>>       exit(strcmp(ver, "1.0.6") < 0);
>>            ^
>> conftest.c:251:10: note: include the header <string.h> or explicitly
>> provide a declaration for 'strcmp'
>> 1 warning and 2 errors generated.
>>
>>
>> Suggestions for fixing this?
>>
>> Duncan Murdoch
>>
> 
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-- 
Brian D. Ripley,                  ripley using stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford