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### configure.ac -*- Autoconf -*-
AC_PREREQ(2.69)
AC_INIT([xgboost],[0.6-3],[],[xgboost],[])
# Use this line to set CC variable to a C compiler
AC_PROG_CC
### Check whether backtrace() is part of libc or the external lib libexecinfo
AC_MSG_CHECKING([Backtrace lib])
AC_MSG_RESULT([])
AC_CHECK_LIB([execinfo], [backtrace], [BACKTRACE_LIB=-lexecinfo], [BACKTRACE_LIB=''])
### Endian detection
AC_MSG_CHECKING([endian])
AC_MSG_RESULT([])
AC_RUN_IFELSE([AC_LANG_PROGRAM([[#include <stdint.h>]], [[const uint16_t endianness = 256; return !!(*(const uint8_t *)&endianness);]])],
[ENDIAN_FLAG="-DDMLC_CMAKE_LITTLE_ENDIAN=1"],
[ENDIAN_FLAG="-DDMLC_CMAKE_LITTLE_ENDIAN=0"])
OPENMP_CXXFLAGS=""
if test `uname -s` = "Linux"
then
OPENMP_CXXFLAGS="\$(SHLIB_OPENMP_CXXFLAGS)"
fi
if test `uname -s` = "Darwin"
then
OPENMP_CXXFLAGS='-Xclang -fopenmp'
OPENMP_LIB='-lomp'
ac_pkg_openmp=no
AC_MSG_CHECKING([whether OpenMP will work in a package])
AC_LANG_CONFTEST([AC_LANG_PROGRAM([[#include <omp.h>]], [[ return (omp_get_max_threads() <= 1); ]])])
${CC} -o conftest conftest.c ${OPENMP_LIB} ${OPENMP_CXXFLAGS} 2>/dev/null && ./conftest && ac_pkg_openmp=yes
AC_MSG_RESULT([${ac_pkg_openmp}])
if test "${ac_pkg_openmp}" = no; then
OPENMP_CXXFLAGS=''
OPENMP_LIB=''
echo '*****************************************************************************************'
echo 'WARNING: OpenMP is unavailable on this Mac OSX system. Training speed may be suboptimal.'
echo ' To use all CPU cores for training jobs, you should install OpenMP by running\n'
echo ' brew install libomp'
echo '*****************************************************************************************'
fi
fi
AC_SUBST(OPENMP_CXXFLAGS)
AC_SUBST(OPENMP_LIB)
AC_SUBST(ENDIAN_FLAG)
AC_SUBST(BACKTRACE_LIB)
AC_CONFIG_FILES([src/Makevars])
AC_OUTPUT
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