Add a compile-time test for PR ld/22269

This compile-time test requires a target C compiler to run.  It fails
on many targets where ELF backend linkers fail to check undefined weak
symbol in static PIE via UNDEFWEAK_NO_DYNAMIC_RELOC.

	PR ld/22269
	* testsuite/ld-elf/pr22269-1.rd: New file.
	* testsuite/ld-elf/pr22269-1.c: Likewise.
	* testsuite/ld-elf/shared.exp: Run pr22269-1.

ld/ChangeLog

@@ -1,3 +1,10 @@
+2017-10-20  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR ld/22269
+	* testsuite/ld-elf/pr22269-1.rd: New file.
+	* testsuite/ld-elf/pr22269-1.c: Likewise.
+	* testsuite/ld-elf/shared.exp: Run pr22269-1.
+
 2017-10-19  Palmer Dabbelt  <palmer@dabbelt.com>
 
 	* emultempl/riscvelf.em (riscv_elf_before_allocation): Add a

ld/testsuite/ld-elf/pr22269-1.c

@@ -0,0 +1,8 @@
+extern int foo __attribute ((weak));
+
+int
+_start (void)
+{
+  if (&foo)
+    return foo;
+}

ld/testsuite/ld-elf/pr22269-1.rd

@@ -0,0 +1,5 @@
+# NONE relocs are not needed in a PIE.
+#failif
+#...
+[0-9a-f]+ +[0-9a-f]+ +R_.*_NONE.*
+#pass

ld/testsuite/ld-elf/shared.exp

@@ -465,6 +465,19 @@ set build_tests {
 
 run_cc_link_tests $build_tests
 
+run_ld_link_tests [list \
+    [list \
+	"Build pr22269-1" \
+	"-pie -e _start --no-dynamic-linker -z text" \
+	"" \
+	"" \
+	{ pr22269-1.c } \
+	{{readelf -rW pr22269-1.rd}} \
+	"pr22269-1" \
+	"-fPIE -O2" \
+    ] \
+]
+
 set run_tests [list \
     [list "Run normal with libfoo.so" \
      "-Wl,--no-as-needed tmpdir/begin.o tmpdir/libfoo.so tmpdir/end.o" "" \