linux-kernel - Build: arm rustgcc unknown argument '-mno-fdpic'

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Message-ID: <CA+G9fYvOanQBYXKSg7C6EU30k8sTRC0JRPJXYu7wWK51w38QUQ@mail.gmail.com>
Date: Mon, 7 Apr 2025 22:58:02 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: open list <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>, rust-for-linux@...r.kernel.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, Ard Biesheuvel <ardb@...nel.org>, 
	Arnd Bergmann <arnd@...db.de>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Anders Roxell <anders.roxell@...aro.org>, laura.nao@...labora.com
Subject: Build: arm rustgcc unknown argument '-mno-fdpic'

Regressions on arm build with config rustgcc-lkftconfig-kselftest on the
Linux mainline and next failed with CONFIG_RUST=y enabled.

First seen on the v6.14-13039-ge8b471285262 (April 3, 2025)
Bad: v6.15-rc1
Good: v6.14-12966-ga2cc6ff5ec8f ( April 3, 2025 )

Bad: next-20250327
Good: next-20250326

* arm, build
 - rustgcc-lkftconfig-kselftest

Regression Analysis:
- New regression? Yes
- Reproducibility? Yes

Build regression: arm rustgcc unknown argument '-mno-fdpic'

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

## Build log
Unable to generate bindings: clang diagnosed error: error: unknown
argument: '-mno-fdpic'


## Source
* Kernel version: v6.15-rc1
* Git tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
* Git sha: 0af2f6be1b4281385b618cb86ad946eded089ac8
* Git describe: v6.15-rc1
* Project details:
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.15-rc1/
* compiler: gcc version (Debian 14.2.0-19) 14.2.0
* Toolchain: rustgcc
* build config: rustgcc-lkftconfig-kselftest

## Test
* Test log: https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.15-rc1/testrun/27924146/suite/build/test/rustgcc-lkftconfig-kselftest/log
* Test details:
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.15-rc1/testrun/27924146/suite/build/test/rustgcc-lkftconfig-kselftest/
* Test history:
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v6.15-rc1/testrun/27924146/suite/build/test/rustgcc-lkftconfig-kselftest/history/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2vNMCPjd4rTR3hQdnzAuHzLE1NR/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2vNMCPjd4rTR3hQdnzAuHzLE1NR/config
* Test history on next:
https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20250407/testrun/27929685/suite/build/test/rustgcc-lkftconfig-kselftest/history/

## Steps to reproduce
 - tuxmake --runtime podman --target-arch arm --toolchain rustgcc
--kconfig defconfig --kconfig-add
https://gitlab.com/Linaro/lkft/kernel-fragments/-/raw/main/systemd.config
--kconfig-add CONFIG_ARM_LPAE=y --kconfig-add CONFIG_GCC_PLUGINS=n
--kconfig-add tools/testing/selftests/rust/config TARGETS=rust dtbs
dtbs-legacy headers kernel kselftest modules

--
Linaro LKFT
https://lkft.linaro.org