[PATCH v1] RISC-V: disallow gcc + rust builds

[Conor Dooley]

From: Conor Dooley <conor.dooley at microchip.com>

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/ [2]
Fixes: 70a57b247251a ("RISC-V: enable building 64-bit kernels with rust support")
Reported-by: Jason Montleon <jmontleo at redhat.com>
Signed-off-by: Conor Dooley <conor.dooley at microchip.com>
---

Palmer, this is yours to take.

CC: jmontleo at redhat.com
CC: ojeda at kernel.org
CC: alex.gaynor at gmail.com
CC: boqun.feng at gmail.com
CC: gary at garyguo.net
CC: bjorn3_gh at protonmail.com
CC: benno.lossin at proton.me
CC: a.hindborg at kernel.org
CC: aliceryhl at google.com
CC: paul.walmsley at sifive.com
CC: palmer at dabbelt.com
CC: nathan at kernel.org
CC: ndesaulniers at google.com
CC: morbo at google.com
CC: justinstitt at google.com
CC: rust-for-linux at vger.kernel.org
CC: linux-riscv at lists.infradead.org
CC: llvm at lists.linux.dev
---
 Documentation/rust/arch-support.rst | 2 +-
 arch/riscv/Kconfig                  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
index 750ff371570a0..54be7ddf3e57a 100644
--- 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 22dc5ea4196ce..76843584960c2 100644
--- 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
-- 
2.45.2