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-rw-r--r--arch/um/Makefile5
1 files changed, 4 insertions, 1 deletions
diff --git a/arch/um/Makefile b/arch/um/Makefile
index dbeab15e7bb7..01b97c19a8ba 100644
--- a/arch/um/Makefile
+++ b/arch/um/Makefile
@@ -77,7 +77,10 @@ include $(srctree)/$(ARCH_DIR)/Makefile-os-$(OS)
KERNEL_DEFINES = $(strip -Derrno=kernel_errno -Dsigprocmask=kernel_sigprocmask \
-Dmktime=kernel_mktime $(ARCH_KERNEL_DEFINES))
KBUILD_CFLAGS += $(KERNEL_DEFINES)
-KBUILD_CFLAGS += $(call cc-option,-fno-unit-at-a-time,)
+# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
+# a lot more stack due to the lack of sharing of stacklots:
+KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
+ echo $(call cc-option,-fno-unit-at-a-time); fi ;)
PHONY += linux