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

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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: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2020-01-22 19:38:21 +00:00
parent 8f3d9f3542
commit 5429ef62bc
6 changed files with 10 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/process/changes.rst
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@ -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

12
arch/arm/crypto/Kconfig
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@ -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

1
crypto/Kconfig
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@ -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

5
include/linux/compiler-gcc.h
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@ -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

1
init/Kconfig
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@ -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

2
scripts/gcc-plugins/Kconfig
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@ -8,7 +8,7 @@ config HAVE_GCC_PLUGINS
menuconfig GCC_PLUGINS
bool "GCC plugins"
depends on HAVE_GCC_PLUGINS
depends on CC_IS_GCC && GCC_VERSION >= 40800
depends on CC_IS_GCC
depends on $(success,$(srctree)/scripts/gcc-plugin.sh $(CC))
default y
help