sysdeps/ieee754/ldbl-opt/configure.ac

   1 sinclude(./aclocal.m4)dnl Autoconf lossage
   2 GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
   3 # Local configure fragment for sysdeps/ieee754/ldbl-opt/.
   4
   5 AC_CACHE_CHECK(whether $CC $CFLAGS supports -mlong-double-128,
   6                libc_cv_mlong_double_128, [dnl
   7 save_CFLAGS="$CFLAGS"
   8 CFLAGS="$CFLAGS -mlong-double-128"
   9 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[
  10 #ifndef __LONG_DOUBLE_128__
  11 # error "compiler did not predefine __LONG_DOUBLE_128__ as expected"
  12 #endif
  13 long double foobar (long double x) { return x; }]])],
  14                [libc_cv_mlong_double_128=yes],
  15                [libc_cv_mlong_double_128=no])
  16 CFLAGS="$save_CFLAGS"])
  17 if test "$libc_cv_mlong_double_128" = no; then
  18   AC_MSG_ERROR([this configuration requires -mlong-double-128 support])
  19 fi