ld/x86: skip p_align-1 tests with unsuitable compiler

When the compiler doesn't properly arrange for foo's alignment, there's
no point even trying these tests. Report the situation as a single
"unsupported" test.

ld/testsuite/ld-elf/linux-x86.exp

@@ -185,6 +185,13 @@ run_ld_link_exec_tests [list \
 	"" \
 	"tmpdir/indirect-extern-access-2.so" \
     ] \
+]
+
+# Old gcc silently ignores __attribute__ ((aligned())) with too big alignment.
+ld_compile $CC_FOR_TARGET $srcdir/$subdir/p_align-1.c tmpdir/p_align-1.o
+set output [run_host_cmd "$READELF" "-SW tmpdir/p_align-1.o"]
+if { [regexp { [.]data *PROGBITS .* 8388608[\n]} $output] } then {
+    run_ld_link_exec_tests [list \
 	[list \
 	    "Run p_align-1a without PIE" \
 	    "$NOPIE_LDFLAGS" \
@@ -222,6 +229,9 @@ run_ld_link_exec_tests [list \
 	    "-fpie" \
 	] \
     ]
+} else {
+    unsupported "p_align-1"
+}
 
 proc elfedit_test { options test output } {
     global ELFEDIT