arm64: vdso: Fix compilation with clang < 8
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Message ID 20190625174316.21946-1-vincenzo.frascino@arm.com
State New
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Series
  • arm64: vdso: Fix compilation with clang < 8
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Commit Message

Vincenzo Frascino June 25, 2019, 5:43 p.m. UTC
clang versions previous to 8 do not support -mcmodel=tiny.

Add a check to the vDSO Makefile for arm64 to remove the flag when these
versions of the compiler are detected.

Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com>
Reported-by: Qian Cai <cai@lca.pw>
Tested-by: Qian Cai <cai@lca.pw>
---
 arch/arm64/kernel/vdso/Makefile | 5 +++++
 1 file changed, 5 insertions(+)

Patch
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diff --git a/arch/arm64/kernel/vdso/Makefile b/arch/arm64/kernel/vdso/Makefile
index ec81d28aeb5d..5154f50aff2d 100644
--- a/arch/arm64/kernel/vdso/Makefile
+++ b/arch/arm64/kernel/vdso/Makefile
@@ -38,6 +38,11 @@  else
 CFLAGS_vgettimeofday.o = -O2 -mcmodel=tiny -include $(c-gettimeofday-y)
 endif
 
+# Clang versions less than 8 do not support -mcmodel=tiny
+ifeq ($(shell test $(CONFIG_CLANG_VERSION) -lt 80000; echo $$?),0)
+CFLAGS_REMOVE_vgettimeofday.o += -mcmodel=tiny
+endif
+
 # Disable gcov profiling for VDSO code
 GCOV_PROFILE := n