Richard Biener <richard.guent...@gmail.com> writes: On Mon, Jul 1, 2019 at 11:13 PM Torbjörn Granlund <t...@gmplib.org> wrote: > > Vincent Lefevre <vinc...@vinc17.net> writes: > > Yes, with LTO, the object file does not contain the structure as is. > Thus the detection from "od -b conftest.$OBJEXT" does not work. > > That could be solved by generating a final executable, right? > Yes.
Does the patch below make sense? The main funcion is needed as we create an executable, its references to foo are needed, else LTO will remove foo altogether. *** /tmp/extdiff.MsIr0g/gmp-main.3300fbb5d615/acinclude.m4 Mon Jun 17 00:11:50 2019 --- /home/tege/prec/gmp-main/acinclude.m4 Tue Jul 2 12:37:53 2019 *************** *** 3307,3313 **** -123456789.0, { '\376', '\334', '\272', '\230', '\166', '\124', '\062', '\020' }, ! };] EOF ! gmp_compile="$CC $CFLAGS $CPPFLAGS -c conftest.c >&AC_FD_CC 2>&1" if AC_TRY_EVAL(gmp_compile); then cat >conftest.awk <<\EOF --- 3307,3320 ---- -123456789.0, { '\376', '\334', '\272', '\230', '\166', '\124', '\062', '\020' }, ! }; ! int main(){ ! int i; ! for (i = 0; i < 8; i++) { ! printf ("%d %d %f\n", foo.before[i] + foo.after[i], foo.x); ! } ! return 0; ! }] EOF ! gmp_compile="$CC $CFLAGS $CPPFLAGS conftest.c -o conftest >&AC_FD_CC 2>&1" if AC_TRY_EVAL(gmp_compile); then cat >conftest.awk <<\EOF *************** *** 3462,3470 **** ] EOF ! gmp_cv_c_double_format=`od -b conftest.$OBJEXT | $AWK -f conftest.awk` case $gmp_cv_c_double_format in unknown*) ! echo "cannot match anything, conftest.$OBJEXT contains" >&AC_FD_CC ! od -b conftest.$OBJEXT >&AC_FD_CC ;; esac --- 3469,3477 ---- ] EOF ! gmp_cv_c_double_format=`od -b conftest | $AWK -f conftest.awk` case $gmp_cv_c_double_format in unknown*) ! echo "cannot match anything, conftest contains" >&AC_FD_CC ! od -b conftest >&AC_FD_CC ;; esac -- Torbjörn Please encrypt, key id 0xC8601622 _______________________________________________ gmp-bugs mailing list gmp-bugs@gmplib.org https://gmplib.org/mailman/listinfo/gmp-bugs