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Fix compilation in modern systems with __int128 capabilities #225

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Fix compilation in modern systems with __int128 capabilities #225

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17 changes: 17 additions & 0 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,23 @@ AC_SUBST([ALL_CXXFLAGS])
AC_CHECK_LIB([pthread], [pthread_create])
AC_SEARCH_LIBS([clock_gettime], [rt], [AC_DEFINE([HAVE_CLOCK_GETTIME], [1], [Define to 1 if you have the 'clock_gettime' function])])

# Check that type __int128 is supported and if the
# std::numeric_limits<__int128> specialization exists
AC_ARG_WITH([int128],
[AS_HELP_STRING([--with-int128], [enable int128])],
[], [with_int128=yes])
AS_IF([test "x$with_int128" != xno],
[AC_CHECK_TYPE([__int128],
[AC_DEFINE([HAVE_INT128], [1], [Define if type __int128 is supported])])
AC_MSG_CHECKING([for std::numeric_limits<__int128>])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <limits>
template<bool> struct StaticAssert; template<> struct StaticAssert<true> { static void assert() { } };]],
[[StaticAssert<std::numeric_limits<__int128>::is_specialized>::assert();]])],
[AC_MSG_RESULT([yes])]
[AC_DEFINE([HAVE_NUMERIC_LIMITS128], [1], [Define if numeric limits specialization exists for __int128])],
[AC_MSG_RESULT([no])])])


# Flags for Jellyfish
AC_SUBST([JELLYFISH2_0_CFLAGS], ['-I$(includedir)/jellyfish-1'])
AC_SUBST([JELLYFISH2_0_LIBS], ['-L$(libdir) -ljellyfish-2.0'])
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