Support Solaris.

[trivialfis]

Related: #6542

I ran a test on https://builder.r-hub.io/ mentioned by @hcho3 . The rabit issue is fixed, but the toolchain itself on the test machine seems a bit weird.

os: Oracle Solaris 10, x86, 32 bit, R-release. A snippet of log is copied here, complete log is uploaded at the end.

./dmlc-core/include/dmlc/./base.h:207:65: note: #pragma message: Warning: FILE OFFSET BITS defined to be 32 bit
 #pragma message("Warning: FILE OFFSET BITS defined to be 32 bit")
                                                                 ^
In file included from /opt/csw/include/c++/5.5.0/tr1/random:46:0,
                 from /opt/csw/include/c++/5.5.0/parallel/random_number.h:36,
                 from /opt/csw/include/c++/5.5.0/parallel/partition.h:38,
                 from /opt/csw/include/c++/5.5.0/parallel/quicksort.h:36,
                 from /opt/csw/include/c++/5.5.0/parallel/sort.h:48,
                 from /opt/csw/include/c++/5.5.0/parallel/algo.h:45,
                 from /opt/csw/include/c++/5.5.0/parallel/algorithm:37,
                 from ./include/xgboost/base.h:59,
                 from ./include/xgboost/logging.h:14,
                 from xgboost_custom.cc:5:
/opt/csw/include/c++/5.5.0/tr1/cmath: In function ‘float std::tr1::acosh(float)’:
/opt/csw/include/c++/5.5.0/tr1/cmath:424:18: error: ‘float std::tr1::acosh(float)’ conflicts with a previous declaration
   acosh(float __x)
                  ^
In file included from /opt/csw/lib/gcc/i386-pc-solaris2.10/5.5.0/include-fixed/math.h:23:0,
                 from /opt/csw/include/c++/5.5.0/cmath:44,
                 from ./include/xgboost/base.h:11,
                 from ./include/xgboost/logging.h:14,
                 from xgboost_custom.cc:5:
/usr/include/iso/math_c99.h:754:15: note: previous declaration ‘float std::acosh(float)’
  inline float acosh(float __X) { return __acoshf(__X); }
               ^
In file included from /opt/csw/include/c++/5.5.0/tr1/random:46:0,
                 from /opt/csw/include/c++/5.5.0/parallel/random_number.h:36,
                 from /opt/csw/include/c++/5.5.0/parallel/partition.h:38,
                 from /opt/csw/include/c++/5.5.0/parallel/quicksort.h:36,
                 from /opt/csw/include/c++/5.5.0/parallel/sort.h:48,
                 from /opt/csw/include/c++/5.5.0/parallel/algo.h:45,
                 from /opt/csw/include/c++/5.5.0/parallel/algorithm:37,
                 from ./include/xgboost/base.h:59,
                 from ./include/xgboost/logging.h:14,
                 from xgboost_custom.cc:5:
/opt/csw/include/c++/5.5.0/tr1/cmath: In function ‘long double std::tr1::acosh(long double)’:
/opt/csw/include/c++/5.5.0/tr1/cmath:428:24: error: ‘long double std::tr1::acosh(long double)’ conflicts with a previous declaration
   acosh(long double __x)
                        ^
In file included from /opt/csw/lib/gcc/i386-pc-solaris2.10/5.5.0/include-fixed/math.h:23:0,
                 from /opt/csw/include/c++/5.5.0/cmath:44,
                 from ./include/xgboost/base.h:11,
                 from ./include/xgboost/logging.h:14,
                 from xgboost_custom.cc:5:
/usr/include/iso/math_c99.h:796:21: note: previous declaration ‘long double std::acosh(long double)’
  inline long double acosh(long double __X) { return __acoshl(__X); }

log.zip

[hcho3]

This line is pulling in TR1, which is likely the culprit of the error:

xgboost/include/xgboost/base.h

Lines 57 to 59 in b2246ae

	#if defined(__GNUC__) && ((__GNUC__ == 4 && __GNUC_MINOR__ >= 8) || __GNUC__ > 4) && \
	!defined(__CUDACC__)
	#include <parallel/algorithm>

I will try to patch that line and re-submit to r-hub.

[hcho3]

We need to check both __sun and sun, according to dmlc/dmlc-core#549

[trivialfis]

Glad that you found the test site!

[hcho3]

After the patch, XGBoost built successfully on R-Hub Solaris:

[hcho3]

Let's backport this patch to the release_1.3.0 branch as well.

[trivialfis]

After the patch, XGBoost built successfully on R-Hub Solaris:

Awesome!

Let's backport this patch to the release_1.3.0 branch as well.

Will list it.

[codecov-io]

Codecov Report

Merging #6578 (2a20e66) into master (b2246ae) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #6578      +/-   ##
==========================================
+ Coverage   80.10%   80.16%   +0.05%     
==========================================
  Files          13       13              
  Lines        3604     3604              
==========================================
+ Hits         2887     2889       +2     
+ Misses        717      715       -2     

Impacted Files	Coverage Δ
python-package/xgboost/tracker.py	93.98% <0.00%> (-1.13%)	⬇️
python-package/xgboost/dask.py	81.38% <0.00%> (+0.84%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b2246ae...5857804. Read the comment docs.