RISC-V: disallow gcc + rust builds

During the discussion before supporting rust on riscv, it was decided
not to support gcc yet, due to differences in extension handling
compared to llvm (only the version of libclang matching the c compiler
is supported). Recently Jason Montleon reported [1] that building with
gcc caused build issues, due to unsupported arguments being passed to
libclang. After some discussion between myself and Miguel, it is better
to disable gcc + rust builds to match the original intent, and
subsequently support it when an appropriate set of extensions can be
deduced from the version of libclang.

Closes: https://lore.kernel.org/all/20240917000848.720765-2-jmontleo@redhat.com/ [1]
Link: https://lore.kernel.org/all/20240926-battering-revolt-6c6a7827413e@spud/
Fixes: 70a57b247251a ("RISC-V: enable building 64-bit kernels with rust support")
Cc: stable@vger.kernel.org
Reported-by: Jason Montleon <jmontleo@redhat.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20241001-playlist-deceiving-16ece2f440f5@spud
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
index 750ff37..54be7dd 100644 (file)
--- a/Documentation/rust/arch-support.rst
+++ b/Documentation/rust/arch-support.rst
@@ -17,7 +17,7 @@ Architecture   Level of support  Constraints
 =============  ================  ==============================================
 ``arm64``      Maintained        Little Endian only.
 ``loongarch``  Maintained        \-
-``riscv``      Maintained        ``riscv64`` only.
+``riscv``      Maintained        ``riscv64`` and LLVM/Clang only.
 ``um``         Maintained        \-
 ``x86``        Maintained        ``x86_64`` only.
 =============  ================  ==============================================

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 6254594..f4c5705 100644 (file)
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -177,7 +177,7 @@ config RISCV
        select HAVE_REGS_AND_STACK_ACCESS_API
        select HAVE_RETHOOK if !XIP_KERNEL
        select HAVE_RSEQ
-       select HAVE_RUST if RUSTC_SUPPORTS_RISCV
+       select HAVE_RUST if RUSTC_SUPPORTS_RISCV && CC_IS_CLANG
        select HAVE_SAMPLE_FTRACE_DIRECT
        select HAVE_SAMPLE_FTRACE_DIRECT_MULTI
        select HAVE_STACKPROTECTOR