[R-SIG-Mac] bzip2 configure error

[Simon Urbanek]

Duncan,

We have a bunch of bugs in configure (on all platforms) when used with -Werror which is default for some Apple compiler builds recently, the one below is just one for them (failing to include stdlib.h and string.h in the test). It may be worth filing a bug report, this should be a reasonably straight-forward task for someone to supply a patch to go through with -Werror and fix them.

Cheers,
Simon



> On Aug 30, 2020, at 06:38, Duncan Murdoch <murdoch.duncan using gmail.com> 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.
> 
> 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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