+if test "${enable_lto}" != "no"; then
+ opt="-flto"
+ AX_CHECK_COMPILE_FLAG(${opt}, [have_lto=yes], [have_lto=no])
+fi
+test "${enable_lto}" = "yes" -a "${have_lto}" != "yes" && \
+ AC_MSG_ERROR([LTO is required but is not available.])
+AC_MSG_CHECKING([if LTO should be enabled])
+if test "${enable_lto}" != "no" -a "${have_lto}" = "yes"; then
+ enable_lto="yes"
+ CFLAGS="${CFLAGS} -flto"
+else
+ enable_lto="no"
+fi
+AC_MSG_RESULT([${enable_lto}])
+
+if test "${GCC}" = "yes"; then
+ AC_DEFINE_UNQUOTED([likely(x)], [__builtin_expect(!!(x), 1)], [gcc branch optimization])
+ AC_DEFINE_UNQUOTED([unlikely(x)], [__builtin_expect(!!(x), 0)], [gcc branch optimization])
+else
+ AC_DEFINE_UNQUOTED([likely(x)], [(x)], [gcc branch optimization])
+ AC_DEFINE_UNQUOTED([unlikely(x)], [(x)], [gcc branch optimization])
+fi
+
+if test "${enable_pedantic}" = "yes"; then
+ enable_strict="yes"
+ CFLAGS="${CFLAGS} -pedantic -Wall -Wextra -Wno-long-long"
+fi
+
+
+# -----------------------------------------------------------------------------
+# memory allocation library
+
+AC_MSG_CHECKING([for memory allocator])
+TS_CHECK_JEMALLOC
+if test "$has_jemalloc" = "1"; then
+ AC_DEFINE([ENABLE_JEMALLOC], [1], [compile and link with jemalloc])
+ AC_MSG_RESULT([jemalloc])
+else
+ TS_CHECK_TCMALLOC
+ if test "$has_tcmalloc" = "1"; then
+ AC_DEFINE([ENABLE_TCMALLOC], [1], [compile and link with tcmalloc])
+ AC_MSG_RESULT([tcmalloc])
+ else
+ AC_MSG_RESULT([system])
+ AC_C_MALLOPT
+ AC_C_MALLINFO
+ fi
+fi
+
+
+# -----------------------------------------------------------------------------
+# libm
+