Commit 5429ef62 authored by Will Deacon's avatar Will Deacon
Browse files

compiler/gcc: Raise minimum GCC version for kernel builds to 4.8 

It is very rare to see versions of GCC prior to 4.8 being used to build
the mainline kernel. These old compilers are also know to have codegen
issues which can lead to silent miscompilation:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145



Raise the minimum GCC version for kernel build to 4.8 and remove some
tautological Kconfig dependencies as a consequence.

Cc: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Reviewed-by: default avatarNick Desaulniers <ndesaulniers@google.com>
Signed-off-by: default avatarWill Deacon <will@kernel.org>
parent 8f3d9f35

Documentation/process/changes.rst

+1 −1
Original line number Diff line number Diff line
@@ -29,7 +29,7 @@ you probably needn't concern yourself with pcmciautils. 
====================== ===============  ========================================

        Program        Minimal version       Command to check the version

====================== ===============  ========================================

GNU C                  4.6              gcc --version

GNU C                  4.8              gcc --version

GNU make               3.81             make --version

binutils               2.23             ld -v

flex                   2.5.35           flex --version

arch/arm/crypto/Kconfig

+6 −6
Original line number Diff line number Diff line
@@ -30,7 +30,7 @@ config CRYPTO_SHA1_ARM_NEON 


config CRYPTO_SHA1_ARM_CE

	tristate "SHA1 digest algorithm (ARM v8 Crypto Extensions)"

	depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)

	depends on KERNEL_MODE_NEON

	select CRYPTO_SHA1_ARM

	select CRYPTO_HASH

	help
@@ -39,7 +39,7 @@ config CRYPTO_SHA1_ARM_CE 


config CRYPTO_SHA2_ARM_CE

	tristate "SHA-224/256 digest algorithm (ARM v8 Crypto Extensions)"

	depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)

	depends on KERNEL_MODE_NEON

	select CRYPTO_SHA256_ARM

	select CRYPTO_HASH

	help
@@ -96,7 +96,7 @@ config CRYPTO_AES_ARM_BS 


config CRYPTO_AES_ARM_CE

	tristate "Accelerated AES using ARMv8 Crypto Extensions"

	depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)

	depends on KERNEL_MODE_NEON

	select CRYPTO_SKCIPHER

	select CRYPTO_LIB_AES

	select CRYPTO_SIMD
@@ -106,7 +106,7 @@ config CRYPTO_AES_ARM_CE 


config CRYPTO_GHASH_ARM_CE

	tristate "PMULL-accelerated GHASH using NEON/ARMv8 Crypto Extensions"

	depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)

	depends on KERNEL_MODE_NEON

	select CRYPTO_HASH

	select CRYPTO_CRYPTD

	select CRYPTO_GF128MUL
@@ -118,13 +118,13 @@ config CRYPTO_GHASH_ARM_CE 


config CRYPTO_CRCT10DIF_ARM_CE

	tristate "CRCT10DIF digest algorithm using PMULL instructions"

	depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)

	depends on KERNEL_MODE_NEON

	depends on CRC_T10DIF

	select CRYPTO_HASH



config CRYPTO_CRC32_ARM_CE

	tristate "CRC32(C) digest algorithm using CRC and/or PMULL instructions"

	depends on KERNEL_MODE_NEON && (CC_IS_CLANG || GCC_VERSION >= 40800)

	depends on KERNEL_MODE_NEON

	depends on CRC32

	select CRYPTO_HASH

crypto/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -316,7 +316,6 @@ config CRYPTO_AEGIS128 
config CRYPTO_AEGIS128_SIMD

	bool "Support SIMD acceleration for AEGIS-128"

	depends on CRYPTO_AEGIS128 && ((ARM || ARM64) && KERNEL_MODE_NEON)

	depends on !ARM || CC_IS_CLANG || GCC_VERSION >= 40800

	default y



config CRYPTO_AEGIS128_AESNI_SSE2

include/linux/compiler-gcc.h

+2 −3
Original line number Diff line number Diff line
@@ -10,7 +10,8 @@ 
		     + __GNUC_MINOR__ * 100	\

		     + __GNUC_PATCHLEVEL__)



#if GCC_VERSION < 40600

/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58145 */

#if GCC_VERSION < 40800

# error Sorry, your compiler is too old - please upgrade it.

#endif
@@ -126,9 +127,7 @@ 
#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__)

#define __HAVE_BUILTIN_BSWAP32__

#define __HAVE_BUILTIN_BSWAP64__

#if GCC_VERSION >= 40800

#define __HAVE_BUILTIN_BSWAP16__

#endif

#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP && !__CHECKER__ */



#if GCC_VERSION >= 70000

init/Kconfig

+0 −1
Original line number Diff line number Diff line
@@ -1285,7 +1285,6 @@ config LD_DEAD_CODE_DATA_ELIMINATION 
	bool "Dead code and data elimination (EXPERIMENTAL)"

	depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION

	depends on EXPERT

	depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800)

	depends on $(cc-option,-ffunction-sections -fdata-sections)

	depends on $(ld-option,--gc-sections)

	help

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