[glibc/maskray/grte] powerpc: Use --no-tls-get-addr-optimize in test only if the linker supports it

[glibc/maskray/grte] powerpc: Use --no-tls-get-addr-optimize in test only if the linker supports it

[Fangrui Song]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=bc129fb15b826520d16656df99a29910a487c252

commit bc129fb15b826520d16656df99a29910a487c252
Author: Fangrui Song <maskray@google.com>
Date:   Tue Aug 24 09:26:44 2021 -0700

    powerpc: Use --no-tls-get-addr-optimize in test only if the linker supports it
    
    LLD doesn't support --{,no-}tls-get-addr-optimize.
    
    Reviewed-by: Tulio Magno Quites Machado Filho <tuliom@linux.ibm.com>
    (cherry picked from commit f9cd7d5d194c652e9ec31634da3fc8ef1bf06780)

Diff:
---
 sysdeps/unix/sysv/linux/powerpc/Makefile     |  2 ++
 sysdeps/unix/sysv/linux/powerpc/configure    | 34 ++++++++++++++++++++++++++++
 sysdeps/unix/sysv/linux/powerpc/configure.ac |  4 ++++
 3 files changed, 40 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/powerpc/Makefile b/sysdeps/unix/sysv/linux/powerpc/Makefile
index 19ac59d862..6ff5cc2fc1 100644
--- a/sysdeps/unix/sysv/linux/powerpc/Makefile
+++ b/sysdeps/unix/sysv/linux/powerpc/Makefile
@@ -19,8 +19,10 @@ ifeq ($(build-shared),yes)
 sysdep-dl-routines += dl-static
 endif
 # Otherwise tst-tls-dlinfo fails due to tst-tlsmod2.so using static tls.
+ifeq ($(have-tls-get-addr-optimize),yes)
 LDFLAGS-tst-tlsmod2.so += -Wl,--no-tls-get-addr-optimize
 endif
+endif
 
 ifeq ($(subdir),misc)
 sysdep_headers += bits/ppc.h
diff --git a/sysdeps/unix/sysv/linux/powerpc/configure b/sysdeps/unix/sysv/linux/powerpc/configure
index 6d2465fcac..dab587c81f 100644
--- a/sysdeps/unix/sysv/linux/powerpc/configure
+++ b/sysdeps/unix/sysv/linux/powerpc/configure
@@ -79,4 +79,38 @@ fi
 
 fi # clang
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for linker that supports --no-tls-get-addr-optimize" >&5
+$as_echo_n "checking for linker that supports --no-tls-get-addr-optimize... " >&6; }
+libc_linker_feature=no
+if test x"$gnu_ld" = x"yes"; then
+  libc_linker_check=`$LD -v --help 2>/dev/null | grep "\--no-tls-get-addr-optimize"`
+  if test -n "$libc_linker_check"; then
+    cat > conftest.c <<EOF
+int _start (void) { return 42; }
+EOF
+    if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp
+				-Wl,--no-tls-get-addr-optimize -nostdlib -nostartfiles
+				-fPIC -shared -o conftest.so conftest.c
+				1>&5'
+  { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+  (eval $ac_try) 2>&5
+  ac_status=$?
+  $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+  test $ac_status = 0; }; }
+    then
+      libc_linker_feature=yes
+    fi
+    rm -f conftest*
+  fi
+fi
+if test $libc_linker_feature = yes; then
+  libc_cv_tls_get_addr_optimize=yes
+else
+  libc_cv_tls_get_addr_optimize=no
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_linker_feature" >&5
+$as_echo "$libc_linker_feature" >&6; }
+config_vars="$config_vars
+have-tls-get-addr-optimize = $libc_cv_tls_get_addr_optimize"
+
 ldd_rewrite_script=sysdeps/unix/sysv/linux/powerpc/ldd-rewrite.sed
diff --git a/sysdeps/unix/sysv/linux/powerpc/configure.ac b/sysdeps/unix/sysv/linux/powerpc/configure.ac
index d3e12079ee..5f7eb3d05b 100644
--- a/sysdeps/unix/sysv/linux/powerpc/configure.ac
+++ b/sysdeps/unix/sysv/linux/powerpc/configure.ac
@@ -40,4 +40,8 @@ fi
 
 fi # clang
 
+LIBC_LINKER_FEATURE([--no-tls-get-addr-optimize], [-Wl,--no-tls-get-addr-optimize],
+                    [libc_cv_tls_get_addr_optimize=yes], [libc_cv_tls_get_addr_optimize=no])
+LIBC_CONFIG_VAR([have-tls-get-addr-optimize], [$libc_cv_tls_get_addr_optimize])
+
 ldd_rewrite_script=sysdeps/unix/sysv/linux/powerpc/ldd-rewrite.sed