[PATCH v2 1/2] MIPS: dec: Only check -msym32 when need compiler

[WangYuli]

During make modules_install, the need-compiler variable becomes null,
so Makefile.compiler isn't included.

This results in call cc-option-yn returning nothing.

To get rid of spurious "CONFIG_CPU_DADDI_WORKAROUNDS unsupported
without -msym32" error, just wrap it into `ifdef need-compiler'.

Link: https://lore.kernel.org/all/alpine.DEB.2.21.2502120612000.65342@xxxxxxxxxxxxxxxxx/
Link: https://lore.kernel.org/all/alpine.DEB.2.21.2307180025120.62448@xxxxxxxxxxxxxxxxx/
Fixes: 805b2e1d427a ("kbuild: include Makefile.compiler only when compiler is needed")
Fixes: 18ca63a2e23c ("MIPS: Probe toolchain support of -msym32")
Reported-by: Maciej W. Rozycki <macro@xxxxxxxxxxx>
Closes: https://lore.kernel.org/all/alpine.DEB.2.21.2501030535080.49841@xxxxxxxxxxxxxxxxx/
Co-developed-by: Chen Linxuan <chenlinxuan@xxxxxxxxxxxxx>
Signed-off-by: Chen Linxuan <chenlinxuan@xxxxxxxxxxxxx>
Signed-off-by: WangYuli <wangyuli@xxxxxxxxxxxxx>
---
 arch/mips/Makefile | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/mips/Makefile b/arch/mips/Makefile
index be8cb44a89fd..4d8339d2f20f 100644
--- a/arch/mips/Makefile
+++ b/arch/mips/Makefile
@@ -304,8 +304,12 @@ ifdef CONFIG_64BIT
   ifeq ($(KBUILD_SYM32), y)
     cflags-$(KBUILD_SYM32) += -msym32 -DKBUILD_64BIT_SYM32
   else
-    ifeq ($(CONFIG_CPU_DADDI_WORKAROUNDS), y)
-      $(error CONFIG_CPU_DADDI_WORKAROUNDS unsupported without -msym32)
+# Do not fiddle with the compilation flags when no compiler is
+# going to be used. To get rid of spurious errors.
+    ifdef need-compiler
+      ifeq ($(CONFIG_CPU_DADDI_WORKAROUNDS), y)
+        $(error CONFIG_CPU_DADDI_WORKAROUNDS unsupported without -msym32)
+      endif
     endif
   endif
 endif
-- 
2.47.2