Replace --enable-static-pie with --disable-default-pie

Build glibc programs and tests as PIE by default and enable static-pie
automatically if the architecture and toolchain supports it.

Also add a new configuration option --disable-default-pie to prevent
building programs as PIE.

Only the following architectures now have PIE disabled by default
because they do not work at the moment.  hppa, ia64, alpha and csky
don't work because the linker is unable to handle a pcrel relocation
generated from PIE objects.  The microblaze compiler is currently
failing with an ICE.  GNU hurd tries to enable static-pie, which does
not work and hence fails.  All these targets have default PIE disabled
at the moment and I have left it to the target maintainers to enable PIE
on their targets.

build-many-glibcs runs clean for all targets.  I also tested x86_64 on
Fedora and Ubuntu, to verify that the default build as well as
--disable-default-pie work as expected with both system toolchains.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

configure

@@ -596,9 +596,6 @@ DEFINES
 static_nss
 profile
 libc_cv_multidir
-libc_cv_pie_default
-libc_cv_cc_pie_default
-libc_cv_pic_default
 shared
 static
 ldd_rewrite_script
@@ -768,7 +765,7 @@ with_timeoutfactor
 enable_sanity_checks
 enable_shared
 enable_profile
-enable_static_pie
+enable_default_pie
 enable_timezone_tools
 enable_hardcoded_path_in_tests
 enable_hidden_plt
@@ -1424,8 +1421,8 @@ Optional Features:
                           in special situations) [default=yes]
   --enable-shared         build shared library [default=yes if GNU ld]
   --enable-profile        build profiled library [default=no]
-  --enable-static-pie     enable static PIE support and use it in the
-                          testsuite [default=no]
+  --disable-default-pie   Do not build glibc programs and the testsuite as PIE
+                          [default=no]
   --disable-timezone-tools
                           do not install timezone tools [default=install]
   --enable-hardcoded-path-in-tests
@@ -3424,11 +3421,11 @@ else
   profile=no
 fi
 
-# Check whether --enable-static-pie was given.
-if test "${enable_static_pie+set}" = set; then :
-  enableval=$enable_static_pie; static_pie=$enableval
+# Check whether --enable-default-pie was given.
+if test "${enable_default_pie+set}" = set; then :
+  enableval=$enable_default_pie; default_pie=$enableval
 else
-  static_pie=no
+  default_pie=yes
 fi
 
 # Check whether --enable-timezone-tools was given.
@@ -6975,7 +6972,8 @@ rm -f conftest.*
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_pic_default" >&5
 $as_echo "$libc_cv_pic_default" >&6; }
-
+config_vars="$config_vars
+build-pic-default = $libc_cv_pic_default"
 
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking whether -fPIE is default" >&5
 $as_echo_n "checking whether -fPIE is default... " >&6; }
@@ -6995,17 +6993,37 @@ rm -f conftest.*
 fi
 { $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_cc_pie_default" >&5
 $as_echo "$libc_cv_cc_pie_default" >&6; }
-libc_cv_pie_default=$libc_cv_cc_pie_default
+config_vars="$config_vars
+cc-pie-default = $libc_cv_cc_pie_default"
 
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if we can build programs as PIE" >&5
+$as_echo_n "checking if we can build programs as PIE... " >&6; }
+if test "x$default_pie" != xno; then
+  # Disable build-pie-default if target does not support it.
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifdef PIE_UNSUPPORTED
+# error PIE is not supported
+#endif
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+  libc_cv_pie_default=yes
+else
+  libc_cv_pie_default=no
+fi
+rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_pie_default" >&5
+$as_echo "$libc_cv_pie_default" >&6; }
+config_vars="$config_vars
+build-pie-default = $libc_cv_pie_default"
 
-
-# Set the `multidir' variable by grabbing the variable from the compiler.
-# We do it once and save the result in a generated makefile.
-libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
-
-
-if test "$static_pie" = yes; then
-  # Check target support for static PIE
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking if we can build static PIE programs" >&5
+$as_echo_n "checking if we can build static PIE programs... " >&6; }
+libc_cv_static_pie=$libc_cv_pie_default
+if test "x$libc_cv_pie_default" != xno \
+   -a "$libc_cv_no_dynamic_linker" = yes; then
+  # Enable static-pie if available
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 #ifndef SUPPORT_STATIC_PIE
@@ -7013,22 +7031,25 @@ if test "$static_pie" = yes; then
 #endif
 _ACEOF
 if ac_fn_c_try_compile "$LINENO"; then :
-
+  libc_cv_static_pie=yes
 else
-  as_fn_error $? "the architecture does not support static PIE" "$LINENO" 5
+  libc_cv_static_pie=no
 fi
 rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
-  # The linker must support --no-dynamic-linker.
-  if test "$libc_cv_no_dynamic_linker" != yes; then
-    as_fn_error $? "linker support for --no-dynamic-linker needed" "$LINENO" 5
-  fi
-  # Default to PIE.
-  libc_cv_pie_default=yes
-  $as_echo "#define ENABLE_STATIC_PIE 1" >>confdefs.h
+  if test "$libc_cv_static_pie" = "yes"; then
+    $as_echo "#define ENABLE_STATIC_PIE 1" >>confdefs.h
 
+  fi
 fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $libc_cv_static_pie" >&5
+$as_echo "$libc_cv_static_pie" >&6; }
 config_vars="$config_vars
-enable-static-pie = $static_pie"
+enable-static-pie = $libc_cv_static_pie"
+
+# Set the `multidir' variable by grabbing the variable from the compiler.
+# We do it once and save the result in a generated makefile.
+libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
+