i686: Do not build ifunc tests if compiler does not generate supported relocations

clang with --target i668 might not produce supported relocations
that ld.bfd can use for -static-pie without -fPIC, which are used
on some tests.  Disable them for now.

aclocal.m4

@@ -148,7 +148,7 @@ AC_SUBST(NM)
 ])
 
 dnl Run a static link test with -nostdlib -nostartfiles.
-dnl LIBC_TRY_LINK_STATIC([code], [action-if-true], [action-if-false])
+dnl LIBC_TRY_LINK_STATIC([code], [opts], [action-if-true], [action-if-false])
 AC_DEFUN([LIBC_TRY_LINK_STATIC],
 [cat > conftest.c <<EOF
 int _start (void) { return 0; }
@@ -156,9 +156,9 @@ int __start (void) { return 0; }
 $1
 EOF
 AS_IF([AC_TRY_COMMAND([${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -o conftest
-		       conftest.c -static -nostartfiles -nostdlib
+		       conftest.c $2 -static -nostartfiles -nostdlib
 		       1>&AS_MESSAGE_LOG_FD])],
-      [$2], [$3])
+      [$3], [$4])
 rm -f conftest*])
 
 dnl Test a compiler option or options with an empty input file.

configure

@@ -8885,6 +8885,7 @@ libc_cv_localstatedir=$localstatedir
 libc_cv_gcc_unwind_find_fde=no
 libc_cv_idn=no
 pthread_in_libc=yes
+libc_cv_ifunc_static_pie=yes
 
 # Iterate over all the sysdep directories we will use, running their
 # configure fragments.
@@ -8900,6 +8901,9 @@ printf "%s\n" "running configure fragment for $dir" >&6; }
   fi
 done
 
+config_vars="$config_vars
+ifunc-static-pie = $libc_cv_ifunc_static_pie"
+
 if test x"$build_mathvec" = xnotset; then
   build_mathvec=no
 fi

configure.ac

@@ -1922,6 +1922,7 @@ libc_cv_localstatedir=$localstatedir
 libc_cv_gcc_unwind_find_fde=no
 libc_cv_idn=no
 pthread_in_libc=yes
+libc_cv_ifunc_static_pie=yes
 
 # Iterate over all the sysdep directories we will use, running their
 # configure fragments.
@@ -1936,6 +1937,8 @@ for dir in $sysnames; do
   fi
 done
 
+LIBC_CONFIG_VAR([ifunc-static-pie], [$libc_cv_ifunc_static_pie])
+
 if test x"$build_mathvec" = xnotset; then
   build_mathvec=no
 fi

elf/Makefile

@@ -1211,16 +1211,20 @@ tests += $(tests-static)
 ifeq (yes,$(have-ifunc))
 tests-ifuncstatic := \
   ifuncmain1picstatic \
-  ifuncmain1static \
   ifuncmain2picstatic \
   ifuncmain2static \
   ifuncmain4picstatic \
-  ifuncmain4static \
   ifuncmain5picstatic \
   ifuncmain5static \
+  # tests-ifuncstatic
+ifeq (yes,$(ifunc-static-pie))
+tests-ifuncstatic += \
+  ifuncmain1static \
+  ifuncmain4static \
   ifuncmain7picstatic \
   ifuncmain7static \
   # tests-ifuncstatic
+endif
 ifeq (yes,$(have-gcc-ifunc))
 tests-ifuncstatic += ifuncmain9static ifuncmain9picstatic
 endif
@@ -1240,11 +1244,15 @@ tests-internal += \
   ifuncmain2 \
   ifuncmain2pic \
   ifuncmain3 \
-  ifuncmain4 \
   ifuncmain5staticpic \
+  # tests-internal
+ifeq (yes,$(ifunc-static-pie))
+tests-internal += \
+  ifuncmain4 \
   ifuncmain7 \
   ifuncmain7pic \
   # tests-internal
+endif
 ifeq (no,$(with-lld))
 tests-internal += \
   ifuncmain1 \
@@ -1273,9 +1281,13 @@ ifunc-pie-tests = \
   ifuncmain1pie \
   ifuncmain1staticpie \
   ifuncmain1vispie \
+  # ifunc-pie-tests
+ifeq (yes,$(ifunc-static-pie))
+ifunc-pie-tests += \
   ifuncmain6pie \
   ifuncmain7pie \
   # ifunc-pie-tests
+endif
 ifeq (yes,$(have-gcc-ifunc))
 ifunc-pie-tests += ifuncmain9pie
 endif

sysdeps/i386/configure

@@ -90,6 +90,37 @@ printf "%s\n" "$libc_cv_ld_static_pie" >&6; }
   fi
 fi
 
+if test "$libc_cv_static_pie" == "yes"; then
+  cat > conftest.c <<EOF
+int _start (void) { return 0; }
+int __start (void) { return 0; }
+int foo (void) __attribute__ ((ifunc ("foo_ifunc")));
+void *
+foo_ifunc (void)
+{
+  return 0;
+}
+int main (void)
+{
+  return foo ();
+}
+EOF
+if { ac_try='${CC-cc} $CFLAGS $CPPFLAGS $LDFLAGS $no_ssp -o conftest
+		       conftest.c -fPIE -static-pie -static -nostartfiles -nostdlib
+		       1>&5'
+  { { eval echo "\"\$as_me\":${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_ifunc_static_pie=yes
+else $as_nop
+  libc_cv_ifunc_static_pie=no
+fi
+rm -f conftest*
+fi
+
 if test x"$multi_arch" != xno; then
   printf "%s\n" "#define NO_HIDDEN_EXTERN_FUNC_IN_PIE 1" >>confdefs.h
 

sysdeps/i386/configure.ac

@@ -58,6 +58,21 @@ rm -f conftest*])
   fi
 fi
 
+if test "$libc_cv_static_pie" == "yes"; then
+  LIBC_TRY_LINK_STATIC([dnl
+int foo (void) __attribute__ ((ifunc ("foo_ifunc")));
+void *
+foo_ifunc (void)
+{
+  return 0;
+}
+int main (void)
+{
+  return foo ();
+}],
+    [-fPIE -static-pie], libc_cv_ifunc_static_pie=yes, libc_cv_ifunc_static_pie=no)
+fi
+
 dnl When multi-arch is enabled, all external functions must be called
 dnl via PIC PLT in PIE, which requires setting up EBX register.
 if test x"$multi_arch" != xno; then