Skip a test if LD_PRELOAD doesn't work

May be related to the following issues:

  #1305
  #1309

test/elf/shared-abs-sym.sh

@@ -1,31 +1,52 @@
 #!/bin/bash
 . $(dirname $0)/common.inc
 
-cat <<EOF | $CC -B. -fPIC -shared -o $t/a.so -xassembler -
+# LD_PRELOAD may not work in some environments, so try to test it
+# with the default linker first
+cat <<EOF | $CC -fPIC -shared -o $t/a.so -xc -
+int foo() { return 3; }
+EOF
+
+cat <<EOF | $CC -fPIC -shared -o $t/b.so -xc -
+int foo() { return 5; }
+EOF
+
+cat <<EOF | $CC -fPIC -c -o $t/c.o -xc -
+#include <stdio.h>
+int foo();
+int main() { printf("foo=%d\n", foo()); }
+EOF
+
+$CC -o $t/exe1 -pie $t/c.o $t/a.so
+$QEMU $t/exe1 | grep -q 'foo=3'
+LD_PRELOAD=$t/b.so $QEMU $t/exe1 | grep -q 'foo=5' || skip
+
+# If LD_PRELOAD works, continue
+cat <<EOF | $CC -B. -fPIC -shared -o $t/d.so -xassembler -
 .globl foo
 foo = 3;
 EOF
 
-cat <<EOF | $CC -B. -fPIC -shared -o $t/b.so -xassembler -
+cat <<EOF | $CC -B. -fPIC -shared -o $t/e.so -xassembler -
 .globl foo
 foo = 5;
 EOF
 
-cat <<EOF | $CC -fPIC -c -o $t/c.o -xc -
+cat <<EOF | $CC -fPIC -c -o $t/f.o -xc -
 #include <stdio.h>
 extern char foo;
 int main() { printf("foo=%p\n", &foo); }
 EOF
 
 # This test fails with older glibc
-$CC -B. -o $t/exe1 -pie $t/c.o $t/a.so 2> /dev/null || skip
-$QEMU $t/exe1 | grep -q 'foo=0x3' || skip
-LD_PRELOAD=$t/b.so $QEMU $t/exe1 | grep -q 'foo=0x5'
-
-$CC -B. -o $t/exe2 -pie $t/c.o $t/a.so
-$QEMU $t/exe2 | grep -q 'foo=0x3'
-LD_PRELOAD=$t/b.so $QEMU $t/exe2 | grep -q 'foo=0x5'
+$CC -B. -o $t/exe2 -pie $t/f.o $t/d.so 2> /dev/null || skip
+$QEMU $t/exe2 | grep -q 'foo=0x3' || skip
+LD_PRELOAD=$t/e.so $QEMU $t/exe2 | grep -q 'foo=0x5'
 
-$CC -B. -o $t/exe3 -no-pie $t/c.o $t/a.so
+$CC -B. -o $t/exe3 -pie $t/f.o $t/d.so
 $QEMU $t/exe3 | grep -q 'foo=0x3'
-LD_PRELOAD=$t/b.so $QEMU $t/exe3 | grep -q 'foo=0x5'
+LD_PRELOAD=$t/e.so $QEMU $t/exe3 | grep -q 'foo=0x5'
+
+$CC -B. -o $t/exe4 -no-pie $t/f.o $t/d.so
+$QEMU $t/exe4 | grep -q 'foo=0x3'
+LD_PRELOAD=$t/e.so $QEMU $t/exe4 | grep -q 'foo=0x5'