m4/ld-O1.m4

   1 # ld-O1.m4 serial 3
   2
   3 # Test if ld supports -O1
   4
   5 AC_DEFUN([PAM_LD_O1],
   6   [
   7     AC_CACHE_CHECK(whether ld supports -O1,
   8       pam_cv_ld_O1, [ dnl
   9     cat > conftest.c <<EOF
  10 int main (void) { return 0; }
  11 EOF
  12      if AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS
  13                                  -o conftest.o conftest.c
  14                                  -Wl,-O1 1>&AS_MESSAGE_LOG_FD])
  15   then
  16     pam_cv_ld_O1=yes
  17     LDFLAGS="$LDFLAGS -Wl,-O1"
  18   else
  19     pam_cv_ld_O1=no
  20   fi
  21   rm -f conftest*])
  22   AC_SUBST(pam_cv_ld_O1)
  23   ]
  24 )