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Commit a9d57ef15cbe ("x86/retpolines: Disable switch jump tables when
retpolines are enabled") added -fno-jump-tables to workaround a GCC issue
while deliberately avoiding adding this flag when CONFIG_CC_IS_CLANG is
set, which is defined by the kconfig system when CC=clang is provided.
However, this symbol was added in 4.18 in commit 469cb7376c06 ("kconfig:
add CC_IS_CLANG and CLANG_VERSION") so it is always undefined in 4.14,
meaning -fno-jump-tables gets added when using Clang.
Fix this up by using the equivalent $(cc-name) comparison, which matches
what upstream did until commit 076f421da5d4 ("kbuild: replace cc-name
test with CONFIG_CC_IS_CLANG").
Fixes: e28951100515 ("x86/retpolines: Disable switch jump tables when retpolines are enabled")
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
32c2a4de71