configure: Check for static PIE support

Add SUPPORT_STATIC_PIE that targets can define if they support
static PIE. This requires PI_STATIC_AND_HIDDEN support and various
linker features as described in

  commit 9d7a3741c9
  Add --enable-static-pie configure option to build static PIE [BZ #19574]

Currently defined on x86_64, i386 and aarch64 where static PIE is
known to work.

config.h.in

@@ -259,6 +259,9 @@
 /* Build glibc with tunables support.  */
 #define HAVE_TUNABLES 0
 
+/* Define if static PIE is supported.  */
+#undef SUPPORT_STATIC_PIE
+
 /* Define if static PIE is enabled.  */
 #define ENABLE_STATIC_PIE 0
 

configure

@@ -6814,6 +6814,19 @@ libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
 
 
 if test "$static_pie" = yes; then
+  # Check target support for static PIE
+  cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h.  */
+#ifndef SUPPORT_STATIC_PIE
+# error static PIE is not supported
+#endif
+_ACEOF
+if ac_fn_c_try_compile "$LINENO"; then :
+
+else
+  as_fn_error $? "the architecture does not support static PIE" "$LINENO" 5
+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

configure.ac

@@ -1831,6 +1831,10 @@ libc_cv_multidir=`${CC-cc} $CFLAGS $CPPFLAGS -print-multi-directory`
 AC_SUBST(libc_cv_multidir)
 
 if test "$static_pie" = yes; then
+  # Check target support for static PIE
+  AC_COMPILE_IFELSE([AC_LANG_SOURCE([[#ifndef SUPPORT_STATIC_PIE
+# error static PIE is not supported
+#endif]])], , AC_MSG_ERROR([the architecture does not support static PIE]))
   # The linker must support --no-dynamic-linker.
   if test "$libc_cv_no_dynamic_linker" != yes; then
     AC_MSG_ERROR([linker support for --no-dynamic-linker needed])

sysdeps/aarch64/configure

@@ -6,6 +6,10 @@
 $as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h
 
 
+# Static PIE is supported.
+$as_echo "#define SUPPORT_STATIC_PIE 1" >>confdefs.h
+
+
 # We check to see if the compiler and flags are
 # selecting the big endian ABI and if they are then
 # we set libc_cv_aarch64_be to yes which causes

sysdeps/aarch64/configure.ac

@@ -5,6 +5,9 @@ GLIBC_PROVIDES dnl See aclocal.m4 in the top level source directory.
 # The exception is -mcmodel=large which is unsupported with PIC/PIE.
 AC_DEFINE(PI_STATIC_AND_HIDDEN)
 
+# Static PIE is supported.
+AC_DEFINE(SUPPORT_STATIC_PIE)
+
 # We check to see if the compiler and flags are
 # selecting the big endian ABI and if they are then
 # we set libc_cv_aarch64_be to yes which causes

sysdeps/i386/configure

@@ -117,3 +117,6 @@ if test x"$multi_arch" != xno; then
   $as_echo "#define NO_HIDDEN_EXTERN_FUNC_IN_PIE 1" >>confdefs.h
 
 fi
+
+$as_echo "#define SUPPORT_STATIC_PIE 1" >>confdefs.h
+

sysdeps/i386/configure.ac

@@ -77,3 +77,6 @@ dnl via PIC PLT in PIE, which requires setting up EBX register.
 if test x"$multi_arch" != xno; then
   AC_DEFINE(NO_HIDDEN_EXTERN_FUNC_IN_PIE)
 fi
+
+dnl Static PIE is supported.
+AC_DEFINE(SUPPORT_STATIC_PIE)

sysdeps/x86_64/configure

@@ -143,5 +143,8 @@ fi
 $as_echo "#define PI_STATIC_AND_HIDDEN 1" >>confdefs.h
 
 
+$as_echo "#define SUPPORT_STATIC_PIE 1" >>confdefs.h
+
+
 test -n "$critic_missing" && as_fn_error $? "
 *** $critic_missing" "$LINENO" 5

sysdeps/x86_64/configure.ac

@@ -82,5 +82,8 @@ dnl It is always possible to access static and hidden symbols in an
 dnl position independent way.
 AC_DEFINE(PI_STATIC_AND_HIDDEN)
 
+dnl Static PIE is supported.
+AC_DEFINE(SUPPORT_STATIC_PIE)
+
 test -n "$critic_missing" && AC_MSG_ERROR([
 *** $critic_missing])