[R-SIG-Mac] Xcode 9

[Prof Brian Ripley]

On 27/09/2017 03:28, Kasper Daniel Hansen wrote:
> I don't see this with
>    Xcode 9
>    OS X Sierra (10.12.6)
> 
> and either
> 
> R Under development (unstable) (2017-09-26 r73351) -- "Unsuffered
> Consequences"
> Copyright (C) 2017 The R Foundation for Statistical Computing
> Platform: x86_64-apple-darwin16.7.0 (64-bit)
> 
> or
> 
> R version 3.4.2 RC (2017-09-26 r73351) -- "Short Summer"
> Copyright (C) 2017 The R Foundation for Statistical Computing
> Platform: x86_64-apple-darwin16.7.0 (64-bit)
> 
> Specifically I can compile R and it passes make check.  Perhaps it got
> fixed since the post.

It did (look at the logs for r73347 and r73351), but also we have 
discovered that not all upgrades to Xcode 9 had the problem.

While we are at it, there is a problem with finding the default time 
zone on High Sierra.  This is worked around already in R-devel and will 
be in 3.4.2 patched: until then setting TZ is a good workaround (and 
that is in the R-admin manual for 3.4.2 RC).

> 
> On Fri, Sep 22, 2017 at 4:47 AM, peter dalgaard <pdalgd at gmail.com> wrote:
> 
>> Just a quick note: Xcode 9 will not presently create a working R on Sierra
>> or earlier.

(I don't believe Xcode 9 is available for 'earlier'.)

>>
>> This is because it ships with an SDK for 10.13 (unreleased) and defines an
>> entry for utimensat(), which is not actually in the system library for
>> earlier versions.
>>
>> There is no way we can fix this reliably for the upcoming 3.4.2 release,
>> so if you intend to build R from sources, either
>>
>> - just do not upgrade, stay on Xcode 8.3.3
>>
>> or
>>
>> - manually remove the line from config.h saying
>>
>> #define HAVE_UTIMENSAT 1
>>
>>
>> ----
>>
>> The slightly longer story is that Apple decided to have their include
>> files generate a _warning_ that utimensat() is only available in 10.13,
>> like this:
>>
>> gcc -I../../../R/src/extra  -I. -I../../src/include
>> -I../../../R/src/include  -I/usr/local/include -I../../../R/src/nmath
>> -DHAVE_CONFIG_H     -g -O2  -c ../../../R/src/main/platform.c -o platform.o
>> ../../../R/src/main/platform.c:2474:5: warning: 'utimensat' is only
>> available on
>>        macOS 10.13 or newer [-Wunguarded-availability-new]
>>      utimensat(AT_FDCWD, to, times, 0);
>>      ^~~~~~~~~
>> /Applications/Xcode.app/Contents/Developer/Platforms/
>> MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include/sys/stat.h:374:5:
>> note:
>>        'utimensat' has been explicitly marked partial here
>> int     utimensat(int __fd, const char *__path, const struct timespec __...
>>          ^
>> ../../../R/src/main/platform.c:2474:5: note: enclose 'utimensat' in a
>>        __builtin_available check to silence this warning
>>      utimensat(AT_FDCWD, to, times, 0);
>>      ^~~~~~~~~
>> ../../../R/src/main/platform.c:2890:11: warning: 'utimensat' is only
>> available
>>        on macOS 10.13 or newer [-Wunguarded-availability-new]
>>      res = utimensat(AT_FDCWD, fn, times, 0) == 0;
>>            ^~~~~~~~~
>> /Applications/Xcode.app/Contents/Developer/Platforms/
>> MacOSX.platform/Developer/SDKs/MacOSX10.13.sdk/usr/include/sys/stat.h:374:5:
>> note:
>>        'utimensat' has been explicitly marked partial here
>> int     utimensat(int __fd, const char *__path, const struct timespec __...
>>          ^
>> ../../../R/src/main/platform.c:2890:11: note: enclose 'utimensat' in a
>>        __builtin_available check to silence this warning
>>      res = utimensat(AT_FDCWD, fn, times, 0) == 0;
>>            ^~~~~~~~~
>> 2 warnings generated.
>>
>> Because of dynamic linking, we do not see the effect of this until we
>> actually try running the binary:
>>
>> begin installing recommended package MASS
>> dyld: lazy symbol binding failed: Symbol not found: _utimensat
>>    Referenced from: /Users/pd/r-release-branch/BUILD-dist/bin/exec/x86_64/R
>>    Expected in: /usr/lib/libSystem.B.dylib
>>
>> dyld: Symbol not found: _utimensat
>>    Referenced from: /Users/pd/r-release-branch/BUILD-dist/bin/exec/x86_64/R
>>    Expected in: /usr/lib/libSystem.B.dylib
>>
>> /Users/pd/r-release-branch/BUILD-dist/bin/INSTALL: line 34: 59149 Done
>>                  echo 'tools:::.install_packages()'
>>       59150 Abort trap: 6           | R_DEFAULT_PACKAGES= LC_COLLATE=C
>> "${R_HOME}/bin/R" $myArgs --slave --args ${args}
>>
>>
>> Same warning also happens during the configure checks, but as it is not an
>> error the test program compiles and links OK (but is never run), and we get
>>
>> checking whether utimensat exists and is declared... yes
>>
>> Ugh!...
>>
>>
>> - Peter D.
>>
>>
>> --
>> Peter Dalgaard, Professor,
>> Center for Statistics, Copenhagen Business School
>> Solbjerg Plads 3, 2000 Frederiksberg, Denmark
>> Phone: (+45)38153501
>> Office: A 4.23
>> Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com
>>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Emeritus Professor of Applied Statistics, University of Oxford