From 302247c89121e8d4c7629e589edbb4974fff6edb Mon Sep 17 00:00:00 2001
From: Fangrui Song <maskray@google.com>
Date: Tue, 10 Aug 2021 11:04:56 -0700
Subject: elf: Unconditionally use __ehdr_start

We can consider __ehdr_start (from binutils 2.23 onwards)
unconditionally supported, since configure.ac requires binutils>=2.25.

The configure.ac check is related to an ia64 bug fixed by binutils 2.24.
See https://sourceware.org/pipermail/libc-alpha/2014-August/053503.html

Tested on x86_64-linux-gnu. Tested build-many-glibcs.py with
aarch64-linux-gnu and s390x-linux-gnu.

Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
---
 configure | 52 ----------------------------------------------------
 1 file changed, 52 deletions(-)

(limited to 'configure')

diff --git a/configure b/configure
index 9619c10991..7272fbf6ea 100755
--- a/configure
+++ b/configure
@@ -6636,58 +6636,6 @@ if test $libc_cv_predef_fortify_source = yes; then
 fi
 
 
-# Some linkers on some architectures support __ehdr_start but with
-# bugs.  Make sure usage of it does not create relocations in the
-# output (as the linker should resolve them all for us).
-{ $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the linker provides working __ehdr_start" >&5
-$as_echo_n "checking whether the linker provides working __ehdr_start... " >&6; }
-if ${libc_cv_ehdr_start+:} false; then :
-  $as_echo_n "(cached) " >&6
-else
-
-old_CFLAGS="$CFLAGS"
-old_LDFLAGS="$LDFLAGS"
-old_LIBS="$LIBS"
-CFLAGS="$CFLAGS -fPIC"
-LDFLAGS="$LDFLAGS -nostdlib -nostartfiles -shared $no_ssp"
-LIBS=
-cat confdefs.h - <<_ACEOF >conftest.$ac_ext
-/* end confdefs.h.  */
-
-typedef struct {
-  char foo;
-  long val;
-} Ehdr;
-extern const Ehdr __ehdr_start __attribute__ ((visibility ("hidden")));
-long ehdr (void) { return __ehdr_start.val; }
-
-_ACEOF
-if ac_fn_c_try_link "$LINENO"; then :
-  if $READELF -r conftest | grep -F __ehdr_start >/dev/null; then
-		  libc_cv_ehdr_start=broken
-		else
-		  libc_cv_ehdr_start=yes
-		fi
-else
-  libc_cv_ehdr_start=no
-fi
-rm -f core conftest.err conftest.$ac_objext \
-    conftest$ac_exeext conftest.$ac_ext
-CFLAGS="$old_CFLAGS"
-LDFLAGS="$old_LDFLAGS"
-LIBS="$old_LIBS"
-
-fi
-{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_ehdr_start" >&5
-$as_echo "$libc_cv_ehdr_start" >&6; }
-if test "$libc_cv_ehdr_start" = yes; then
-  $as_echo "#define HAVE_EHDR_START 1" >>confdefs.h
-
-elif test "$libc_cv_ehdr_start" = broken; then
-  { $as_echo "$as_me:${as_lineno-$LINENO}: WARNING: linker is broken -- you should upgrade" >&5
-$as_echo "$as_me: WARNING: linker is broken -- you should upgrade" >&2;}
-fi
-
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether the assembler requires one version per symbol" >&5
 $as_echo_n "checking whether the assembler requires one version per symbol... " >&6; }
 if ${libc_cv_symver_needs_alias+:} false; then :
-- 
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