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Rust fixes for v6.12 (2nd)
Toolchain and infrastructure:
- Fix several issues with the 'rustc-option' macro. It includes a
refactor from Masahiro of three '{cc,rust}-*' macros, which is not
a fix but avoids repeating the same commands (which would be several
lines in the case of 'rustc-option').
- Fix conditions for 'CONFIG_HAVE_CFI_ICALL_NORMALIZE_INTEGERS'. It
includes the addition of 'CONFIG_RUSTC_LLVM_VERSION', which is not a
fix but is needed for the actual fix.
And a trivial grammar fix.
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Merge tag 'rust-fixes-6.12-2' of https://github.com/Rust-for-Linux/linux
Pull rust fixes from Miguel Ojeda:
"Toolchain and infrastructure:
- Fix several issues with the 'rustc-option' macro. It includes a
refactor from Masahiro of three '{cc,rust}-*' macros, which is not
a fix but avoids repeating the same commands (which would be
several lines in the case of 'rustc-option').
- Fix conditions for 'CONFIG_HAVE_CFI_ICALL_NORMALIZE_INTEGERS'. It
includes the addition of 'CONFIG_RUSTC_LLVM_VERSION', which is not
a fix but is needed for the actual fix.
And a trivial grammar fix"
* tag 'rust-fixes-6.12-2' of https://github.com/Rust-for-Linux/linux:
cfi: fix conditions for HAVE_CFI_ICALL_NORMALIZE_INTEGERS
kbuild: rust: add `CONFIG_RUSTC_LLVM_VERSION`
kbuild: fix issues with rustc-option
kbuild: refactor cc-option-yn, cc-disable-warning, rust-option-yn macros
lib/Kconfig.debug: fix grammar in RUST_BUILD_ASSERT_ALLOW
This commit is contained in:
Linus Torvalds
commit
4e6bd4a33a
26
arch/Kconfig
26
arch/Kconfig
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@ -838,7 +838,7 @@ config CFI_CLANG
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config CFI_ICALL_NORMALIZE_INTEGERS
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bool "Normalize CFI tags for integers"
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depends on CFI_CLANG
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depends on HAVE_CFI_ICALL_NORMALIZE_INTEGERS
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depends on HAVE_CFI_ICALL_NORMALIZE_INTEGERS_CLANG
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help
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This option normalizes the CFI tags for integer types so that all
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integer types of the same size and signedness receive the same CFI
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@ -851,21 +851,19 @@ config CFI_ICALL_NORMALIZE_INTEGERS
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This option is necessary for using CFI with Rust. If unsure, say N.
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config HAVE_CFI_ICALL_NORMALIZE_INTEGERS
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def_bool !GCOV_KERNEL && !KASAN
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depends on CFI_CLANG
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config HAVE_CFI_ICALL_NORMALIZE_INTEGERS_CLANG
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def_bool y
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depends on $(cc-option,-fsanitize=kcfi -fsanitize-cfi-icall-experimental-normalize-integers)
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help
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Is CFI_ICALL_NORMALIZE_INTEGERS supported with the set of compilers
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currently in use?
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# With GCOV/KASAN we need this fix: https://github.com/llvm/llvm-project/pull/104826
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depends on CLANG_VERSION >= 190000 || (!GCOV_KERNEL && !KASAN_GENERIC && !KASAN_SW_TAGS)
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This option defaults to false if GCOV or KASAN is enabled, as there is
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an LLVM bug that makes normalized integers tags incompatible with
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KASAN and GCOV. Kconfig currently does not have the infrastructure to
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detect whether your rustc compiler contains the fix for this bug, so
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it is assumed that it doesn't. If your compiler has the fix, you can
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explicitly enable this option in your config file. The Kconfig logic
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needed to detect this will be added in a future kernel release.
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config HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC
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def_bool y
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depends on HAVE_CFI_ICALL_NORMALIZE_INTEGERS_CLANG
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depends on RUSTC_VERSION >= 107900
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# With GCOV/KASAN we need this fix: https://github.com/rust-lang/rust/pull/129373
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depends on (RUSTC_LLVM_VERSION >= 190000 && RUSTC_VERSION >= 108200) || \
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(!GCOV_KERNEL && !KASAN_GENERIC && !KASAN_SW_TAGS)
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config CFI_PERMISSIVE
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bool "Use CFI in permissive mode"
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@ -62,7 +62,7 @@ config LLD_VERSION
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config RUSTC_VERSION
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int
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default $(shell,$(srctree)/scripts/rustc-version.sh $(RUSTC))
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default $(rustc-version)
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help
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It does not depend on `RUST` since that one may need to use the version
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in a `depends on`.
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@ -78,6 +78,10 @@ config RUST_IS_AVAILABLE
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In particular, the Makefile target 'rustavailable' is useful to check
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why the Rust toolchain is not being detected.
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config RUSTC_LLVM_VERSION
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int
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default $(rustc-llvm-version)
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config CC_CAN_LINK
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bool
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default $(success,$(srctree)/scripts/cc-can-link.sh $(CC) $(CLANG_FLAGS) $(USERCFLAGS) $(USERLDFLAGS) $(m64-flag)) if 64BIT
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@ -1946,7 +1950,7 @@ config RUST
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depends on !GCC_PLUGIN_RANDSTRUCT
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depends on !RANDSTRUCT
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depends on !DEBUG_INFO_BTF || PAHOLE_HAS_LANG_EXCLUDE
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depends on !CFI_CLANG || RUSTC_VERSION >= 107900 && HAVE_CFI_ICALL_NORMALIZE_INTEGERS
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depends on !CFI_CLANG || HAVE_CFI_ICALL_NORMALIZE_INTEGERS_RUSTC
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select CFI_ICALL_NORMALIZE_INTEGERS if CFI_CLANG
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depends on !CALL_PADDING || RUSTC_VERSION >= 108100
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depends on !KASAN_SW_TAGS
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@ -3060,7 +3060,7 @@ config RUST_BUILD_ASSERT_ALLOW
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bool "Allow unoptimized build-time assertions"
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depends on RUST
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help
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Controls how are `build_error!` and `build_assert!` handled during build.
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Controls how `build_error!` and `build_assert!` are handled during the build.
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If calls to them exist in the binary, it may indicate a violated invariant
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or that the optimizer failed to verify the invariant during compilation.
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@ -65,6 +65,9 @@ cc-option-bit = $(if-success,$(CC) -Werror $(1) -E -x c /dev/null -o /dev/null,$
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m32-flag := $(cc-option-bit,-m32)
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m64-flag := $(cc-option-bit,-m64)
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rustc-version := $(shell,$(srctree)/scripts/rustc-version.sh $(RUSTC))
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rustc-llvm-version := $(shell,$(srctree)/scripts/rustc-llvm-version.sh $(RUSTC))
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# $(rustc-option,<flag>)
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# Return y if the Rust compiler supports <flag>, n otherwise
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# Calls to this should be guarded so that they are not evaluated if
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@ -53,13 +53,11 @@ cc-option = $(call __cc-option, $(CC),\
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# cc-option-yn
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# Usage: flag := $(call cc-option-yn,-march=winchip-c6)
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cc-option-yn = $(call try-run,\
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$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
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cc-option-yn = $(if $(call cc-option,$1),y,n)
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# cc-disable-warning
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# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
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cc-disable-warning = $(call try-run,\
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$(CC) -Werror $(KBUILD_CPPFLAGS) $(KBUILD_CFLAGS) -W$(strip $(1)) -c -x c /dev/null -o "$$TMP",-Wno-$(strip $(1)))
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cc-disable-warning = $(if $(call cc-option,-W$(strip $1)),-Wno-$(strip $1))
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# gcc-min-version
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# Usage: cflags-$(call gcc-min-version, 70100) += -foo
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@ -75,8 +73,11 @@ ld-option = $(call try-run, $(LD) $(KBUILD_LDFLAGS) $(1) -v,$(1),$(2),$(3))
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# __rustc-option
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# Usage: MY_RUSTFLAGS += $(call __rustc-option,$(RUSTC),$(MY_RUSTFLAGS),-Cinstrument-coverage,-Zinstrument-coverage)
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# TODO: remove RUSTC_BOOTSTRAP=1 when we raise the minimum GNU Make version to 4.4
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__rustc-option = $(call try-run,\
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$(1) $(2) $(3) --crate-type=rlib /dev/null --out-dir=$$TMPOUT -o "$$TMP",$(3),$(4))
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echo '#![allow(missing_docs)]#![feature(no_core)]#![no_core]' | RUSTC_BOOTSTRAP=1\
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$(1) --sysroot=/dev/null $(filter-out --sysroot=/dev/null,$(2)) $(3)\
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--crate-type=rlib --out-dir=$(TMPOUT) --emit=obj=- - >/dev/null,$(3),$(4))
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# rustc-option
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# Usage: rustflags-y += $(call rustc-option,-Cinstrument-coverage,-Zinstrument-coverage)
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@ -85,5 +86,4 @@ rustc-option = $(call __rustc-option, $(RUSTC),\
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# rustc-option-yn
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# Usage: flag := $(call rustc-option-yn,-Cinstrument-coverage)
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rustc-option-yn = $(call try-run,\
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$(RUSTC) $(KBUILD_RUSTFLAGS) $(1) --crate-type=rlib /dev/null --out-dir=$$TMPOUT -o "$$TMP",y,n)
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rustc-option-yn = $(if $(call rustc-option,$1),y,n)
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22
scripts/rustc-llvm-version.sh
Executable file
22
scripts/rustc-llvm-version.sh
Executable file
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@ -0,0 +1,22 @@
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#!/bin/sh
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# SPDX-License-Identifier: GPL-2.0
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#
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# Usage: $ ./rustc-llvm-version.sh rustc
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#
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# Print the LLVM version that the Rust compiler uses in a 6 digit form.
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# Convert the version string x.y.z to a canonical up-to-6-digits form.
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get_canonical_version()
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{
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IFS=.
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set -- $1
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echo $((10000 * $1 + 100 * $2 + $3))
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}
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if output=$("$@" --version --verbose 2>/dev/null | grep LLVM); then
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set -- $output
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get_canonical_version $3
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else
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echo 0
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exit 1
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fi
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