if (A_Base == B_Base && A_Base)
report_fatal_error("unsupported relocation with identical base", false);
- // A subtraction expression where both symbols are undefined is a
+ // A subtraction expression where either symbol is undefined is a
// non-relocatable expression.
- if (A->isUndefined() && B->isUndefined())
- report_fatal_error("unsupported relocation with subtraction expression",
- false);
+ if (A->isUndefined() || B->isUndefined()) {
+ StringRef Name = A->isUndefined() ? A->getName() : B->getName();
+ Asm.getContext().FatalError(Fixup.getLoc(),
+ "unsupported relocation with subtraction expression, symbol '" +
+ Name + "' can not be undefined in a subtraction expression");
+ }
Value += Writer->getSymbolAddress(&A_SD, Layout) -
(!A_Base ? 0 : Writer->getSymbolAddress(A_Base, Layout));
--- /dev/null
+// RUN: not llvm-mc -triple x86_64-apple-darwin10 %s -filetype=obj -o - 2> %t.err > %t
+// RUN: FileCheck --check-prefix=CHECK-ERROR < %t.err %s
+
+_Z:
+.long (_Z+4)-_b
+// CHECK-ERROR: error: unsupported relocation with subtraction expression, symbol '_b' can not be undefined in a subtraction expression
--- /dev/null
+// RUN: not llvm-mc -triple x86_64-apple-darwin10 %s -filetype=obj -o - 2> %t.err > %t
+// RUN: FileCheck --check-prefix=CHECK-ERROR < %t.err %s
+
+_Z:
+.long (_a+4)-_Z
+// CHECK-ERROR: error: unsupported relocation with subtraction expression, symbol '_a' can not be undefined in a subtraction expression