diff --git a/lld/ELF/Arch/PPC.cpp b/lld/ELF/Arch/PPC.cpp
--- a/lld/ELF/Arch/PPC.cpp
+++ b/lld/ELF/Arch/PPC.cpp
@@ -20,6 +20,9 @@
 using namespace lld;
 using namespace lld::elf;
 
+// Undefine the macro predefined by GCC powerpc32.
+#undef PPC
+
 namespace {
 class PPC final : public TargetInfo {
 public: