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configure: Remove for redirection of built-in functions 

The check was initially used to define HAVE_BUILTIN_REDIRECTION, which
enables or not libc_hidden_builtin_proto support. It was later removed
with 3ce1f29594, making the feature
mandatory. The configure check was kept as a transition knob.

Current minimum gcc/linker always supports this, as well as clang with
some extra care. Also, missing hidden_proto/hidden_def support is
already flagged in the check-localplt test.

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
This commit is contained in:
Adhemerval Zanella 2025-11-10 10:29:02 -03:00
parent 1abdb38135
commit 03db446659
2 changed files with 0 additions and 53 deletions
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33
configure vendored
View File

@ -7702,39 +7702,6 @@ if test "$libc_cv_gcc_builtin_memset" = yes ; then
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for redirection of built-in functions" >&5
printf %s "checking for redirection of built-in functions... " >&6; }
if test ${libc_cv_gcc_builtin_redirection+y}
then :
printf %s "(cached) " >&6
else case e in #(
e) cat > conftest.c <<\EOF
extern char *strstr (const char *, const char *) __asm ("my_strstr");
char *foo (const char *a, const char *b)
{
return __builtin_strstr (a, b);
}
EOF
if { ac_try='${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null'
{ { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
(eval $ac_try) 2>&5
ac_status=$?
printf "%s\n" "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
test $ac_status = 0; }; };
then
libc_cv_gcc_builtin_redirection=yes
else
libc_cv_gcc_builtin_redirection=no
fi
rm -f conftest* ;;
esac
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_gcc_builtin_redirection" >&5
printf "%s\n" "$libc_cv_gcc_builtin_redirection" >&6; }
if test "$libc_cv_gcc_builtin_redirection" = no; then
as_fn_error $? "support for the symbol redirection needed" "$LINENO" 5
fi
{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for compiler option to disable generation of FMA instructions" >&5
printf %s "checking for compiler option to disable generation of FMA instructions... " >&6; }
if test ${libc_cv_cc_nofma+y}

20
configure.ac
View File

@ -1493,26 +1493,6 @@ if test "$libc_cv_gcc_builtin_memset" = yes ; then
AC_DEFINE(HAVE_BUILTIN_MEMSET)
fi
AC_CACHE_CHECK(for redirection of built-in functions, libc_cv_gcc_builtin_redirection, [dnl
cat > conftest.c <<\EOF
extern char *strstr (const char *, const char *) __asm ("my_strstr");
char *foo (const char *a, const char *b)
{
return __builtin_strstr (a, b);
}
EOF
dnl
if AC_TRY_COMMAND([${CC-cc} -O3 -S conftest.c -o - | grep -F "my_strstr" > /dev/null]);
then
libc_cv_gcc_builtin_redirection=yes
else
libc_cv_gcc_builtin_redirection=no
fi
rm -f conftest* ])
if test "$libc_cv_gcc_builtin_redirection" = no; then
AC_MSG_ERROR([support for the symbol redirection needed])
fi
dnl Determine how to disable generation of FMA instructions.
AC_CACHE_CHECK([for compiler option to disable generation of FMA instructions],
libc_cv_cc_nofma, [dnl