[test] Test absolute/relative relocations referencing undefined non-weak symbol

Author: MaskRay

lld/test/ELF/weak-undef-rw.s

@@ -1,11 +1,14 @@
 # REQUIRES: x86
-# RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
-# RUN: ld.lld %t.o -o %t --export-dynamic
-# RUN: llvm-readelf -r --hex-dump=.data %t | FileCheck %s --check-prefix=STATIC
-# RUN: ld.lld %t.o -o %t.pie -pie
-# RUN: llvm-readelf -r --hex-dump=.data %t.pie | FileCheck %s --check-prefix=STATIC
-# RUN: ld.lld %t.o -o %t.so -shared
-# RUN: llvm-readobj -r %t.so | FileCheck %s --check-prefix=PIC
+# RUN: rm -rf %t && split-file %s %t && cd %t
+# RUN: llvm-mc -filetype=obj -triple=x86_64 a.s -o a.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64 b.s -o b.o
+# RUN: llvm-mc -filetype=obj -triple=x86_64 c.s -o c.o
+# RUN: ld.lld a.o -o nopie --export-dynamic
+# RUN: llvm-readelf -r --hex-dump=.data nopie | FileCheck %s --check-prefix=STATIC
+# RUN: ld.lld a.o -o out.pie -pie
+# RUN: llvm-readelf -r --hex-dump=.data out.pie | FileCheck %s --check-prefix=STATIC
+# RUN: ld.lld a.o -o out.so -shared
+# RUN: llvm-readobj -r out.so | FileCheck %s --check-prefix=PIC
 
 ## gABI leaves the behavior of weak undefined references implementation defined.
 ## We choose to resolve them statically for static linking and produce dynamic relocations
@@ -23,8 +26,26 @@
 # PIC-NEXT:   R_X86_64_64 foobar 0x0
 # PIC-NEXT: }
 
+# RUN: ld.lld a.o b.o -o out1 -z undefs
+# RUN: llvm-readelf -r -x .data out1 | FileCheck %s --check-prefix=STATIC1
+# RUN: ld.lld a.o b.o -o out1.pie -pie -z undefs
+# RUN: llvm-readelf -r -x .data out1.pie | FileCheck %s --check-prefix=STATIC2
+
+# STATIC1:      no relocations
+# STATIC2:      R_X86_64_RELATIVE
+
+# RUN: ld.lld a.o b.o c.o -pie -z undefs 2>&1 | count 0
+
+#--- a.s
         .global _start
 _start:
         .data
         .weak foobar
         .quad foobar
+
+#--- b.s
+.data
+.quad undef
+
+#--- c.s
+call undef