[PATCH v2] S390: Always enable static PIE if build with lld.

[Stefan Liebler]

LLVM ld.lld now	also supports s390x and avoids unnecessary TPOFF
relocations for position independent executables.  Both recent
commits were also cherry-picked to LLVM 18.

This patch just enables static PIE if build with supported lld.
---
 sysdeps/s390/s390-64/configure    | 80 ++++++++++++++++++++++++++++++-
 sysdeps/s390/s390-64/configure.ac | 16 ++++++-
 2 files changed, 92 insertions(+), 4 deletions(-)

diff --git a/sysdeps/s390/s390-64/configure b/sysdeps/s390/s390-64/configure
index 824ae9c129..d79a25ecf7 100644
--- a/sysdeps/s390/s390-64/configure
+++ b/sysdeps/s390/s390-64/configure
@@ -12,8 +12,84 @@ case $($LD --version) in
     libc_cv_s390x_staticpie_req_version=no
     ;;
   "LLD"*)
-    # As of 2023-08-07, there is no lld which supports s390x.
-    libc_cv_s390x_staticpie_req_version=no
+    # The required lld patches are available with LLVM 18:
+    # - [lld] Add target support for SystemZ (s390x) #75643
+    # https://github.com/llvm/llvm-project/pull/75643
+    # 2024-02-13: https://github.com/llvm/llvm-project/commit/fe3406e349884e4ef61480dd0607f1e237102c74
+    # - [lld/ELF] Avoid unnecessary TPOFF relocations in GOT for -pie #81739
+    # https://github.com/llvm/llvm-project/pull/81739
+    # 2024-02-14: https://github.com/llvm/llvm-project/commit/6f907733e65d24edad65f763fb14402464bd578b
+    libc_cv_s390x_staticpie_req_version=yes
+    # Skip AC_CHECK_PROGS and just use the result from main configure.ac.
+    libc_cv_s390x_staticpie_req_LD=$LD
+    for ac_prog in $LD
+do
+  # Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog; ac_word=$2
+{ printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+printf %s "checking for $ac_word... " >&6; }
+if test ${ac_cv_prog_libc_cv_s390x_staticpie_req_LD+y}
+then :
+  printf %s "(cached) " >&6
+else $as_nop
+  if test -n "$libc_cv_s390x_staticpie_req_LD"; then
+  ac_cv_prog_libc_cv_s390x_staticpie_req_LD="$libc_cv_s390x_staticpie_req_LD" # Let the user override the test.
+else
+as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  case $as_dir in #(((
+    '') as_dir=./ ;;
+    */) ;;
+    *) as_dir=$as_dir/ ;;
+  esac
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir$ac_word$ac_exec_ext"; then
+    ac_cv_prog_libc_cv_s390x_staticpie_req_LD="$ac_prog"
+    printf "%s\n" "$as_me:${as_lineno-$LINENO}: found $as_dir$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+fi
+fi
+libc_cv_s390x_staticpie_req_LD=$ac_cv_prog_libc_cv_s390x_staticpie_req_LD
+if test -n "$libc_cv_s390x_staticpie_req_LD"; then
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $libc_cv_s390x_staticpie_req_LD" >&5
+printf "%s\n" "$libc_cv_s390x_staticpie_req_LD" >&6; }
+else
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+fi
+
+
+  test -n "$libc_cv_s390x_staticpie_req_LD" && break
+done
+
+if test -z "$libc_cv_s390x_staticpie_req_LD"; then
+  ac_verc_fail=yes
+else
+  # Found it, now check the version.
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking version of $libc_cv_s390x_staticpie_req_LD" >&5
+printf %s "checking version of $libc_cv_s390x_staticpie_req_LD... " >&6; }
+  ac_prog_version=`$libc_cv_s390x_staticpie_req_LD --version 2>&1 | sed -n 's/^.*LLD.* \([0-9][0-9]*\.[0-9.]*\).*$/\1/p'`
+  case $ac_prog_version in
+    '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;;
+    1[8-9].*|[2-9][0-9].*)
+       ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;;
+    *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;;
+
+  esac
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: $ac_prog_version" >&5
+printf "%s\n" "$ac_prog_version" >&6; }
+fi
+if test $ac_verc_fail = yes; then
+  libc_cv_s390x_staticpie_req_version=no
+fi
+
     ;;
   *)
     # The required binutils patches are available with bintuils 2.39
diff --git a/sysdeps/s390/s390-64/configure.ac b/sysdeps/s390/s390-64/configure.ac
index 4657de0d37..0c1b276086 100644
--- a/sysdeps/s390/s390-64/configure.ac
+++ b/sysdeps/s390/s390-64/configure.ac
@@ -12,8 +12,20 @@ case $($LD --version) in
     libc_cv_s390x_staticpie_req_version=no
     ;;
   "LLD"*)
-    # As of 2023-08-07, there is no lld which supports s390x.
-    libc_cv_s390x_staticpie_req_version=no
+    # The required lld patches are available with LLVM 18:
+    # - [lld] Add target support for SystemZ (s390x) #75643
+    # https://github.com/llvm/llvm-project/pull/75643
+    # 2024-02-13: https://github.com/llvm/llvm-project/commit/fe3406e349884e4ef61480dd0607f1e237102c74
+    # - [lld/ELF] Avoid unnecessary TPOFF relocations in GOT for -pie #81739
+    # https://github.com/llvm/llvm-project/pull/81739
+    # 2024-02-14: https://github.com/llvm/llvm-project/commit/6f907733e65d24edad65f763fb14402464bd578b
+    libc_cv_s390x_staticpie_req_version=yes
+    # Skip AC_CHECK_PROGS and just use the result from main configure.ac.
+    libc_cv_s390x_staticpie_req_LD=$LD
+    AC_CHECK_PROG_VER(libc_cv_s390x_staticpie_req_LD, $LD, --version,
+		      [LLD.* \([0-9][0-9]*\.[0-9.]*\)],
+		      [1[8-9].*|[2-9][0-9].*],
+		      libc_cv_s390x_staticpie_req_version=no)
     ;;
   *)
     # The required binutils patches are available with bintuils 2.39
-- 
2.43.0