On Mon, May 3, 2021 at 9:51 AM Eric Botcazou <botca...@adacore.com> wrote: > > Hi, > > the test for the presence of variables (really symbols) does not work when you > add -Ox -flto to CFLAGS: > > for v in $vars; do > AC_MSG_CHECKING([for $v]) > AC_CACHE_VAL(libiberty_cv_var_$v, > [AC_LINK_IFELSE([AC_LANG_PROGRAM([[int *p;]],[[extern int $v []; p = > $v;]])], > [eval "libiberty_cv_var_$v=yes"], > [eval "libiberty_cv_var_$v=no"])]) > if eval "test \"`echo '$libiberty_cv_var_'$v`\" = yes"; then > AC_MSG_RESULT(yes) > n=HAVE_`echo $v | tr 'abcdefghijklmnopqrstuvwxyz' > 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'` > AC_DEFINE_UNQUOTED($n) > else > AC_MSG_RESULT(no) > fi > done > > because the assignment to 'p' is optimized away by LTO. This is visible on > MinGW platforms in the form of a link failure for sys_siglist. > > Tested on x86-64/Linux, x86-64/Windows and x86/Windows, OK for the mainline?
OK. > > 2021-05-03 Eric Botcazou <ebotca...@adacore.com> > > * configure.ac: Make test for variables more robust. > * configure: Regenerate. > > -- > Eric Botcazou
