On Fri, May 08, 2026 at 01:55:41PM +0200, Quentin Schulz wrote:
> Hi Tom,
>
> On 5/5/26 5:10 PM, Tom Rini wrote:
> > On Tue, May 05, 2026 at 01:58:26PM +0200, Quentin Schulz wrote:
> > > Hi Tom,
> > >
> > > On 5/4/26 8:04 PM, Tom Rini wrote:
> > > > On Mon, May 04, 2026 at 03:20:27PM +0200, Quentin Schulz wrote:
> > > [...]
> > > > > The first two patches are for fixing pytest calling make directly on a
> > > > > "dirty" build directory as generated by buildman using the clang-20
> > > > > toolchain, but pytest does not set HOSTCC and CC to clang-20,
> > > > > resulting
> > > > > in clang flags being used with gcc).
> > > > >
> > > > > One can simply reproduce it (after backporting up to patch
> > > > > "scripts/Makefile.extrawarn: sync with 6.1") by doing so in the
> > > > > container:
> > > > >
> > > > > make HOSTCC=clang-20 CC=clang-20 O=build/sandbox sandbox_defconfig
> > > > > make HOSTCC=clang-20 CC=clang-20 O=build/sandbox -j`nproc
> > > > > make O=build/sandbox u-boot-initial-env
> > > > >
> > > > > It'll print:
> > > > > gcc: error: unrecognized command-line option '-mno-global-merge'
> > > > > gcc: error: unrecognized command-line option
> > > > > '-Wformat-invalid-specifier'
> > > > > gcc: error: unrecognized command-line option '-Qunused-arguments'
> > > > >
> > > > > This is essentially what's run within test_env_initial_env_file in
> > > > > test/py/tests/test_env.py.
> > > > >
> > > > > While I'm not unhappy with the patches to pytest, it feels to me we
> > > > > may
> > > > > be missing something else for the u-boot-initial-env make target to
> > > > > update the kconfig symbol based on the toolchain being used when
> > > > > called.
> > > >
> > > > Is there some other target in the Makefile that should catch this kind
> > > > of change? It's not just that build target that needs to be remade, it's
> > > > everything, yes?
> > > >
> > >
> > > For the reproducer, one actually needs to do
> > >
> > > diff --git a/Makefile b/Makefile
> > > index bd33437fdfd..9079131f81e 100644
> > > --- a/Makefile
> > > +++ b/Makefile
> > > @@ -1007,15 +1007,15 @@ KBUILD_CFLAGS += $(call
> > > cc-option,-Wno-format-nonliteral)
> > > KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
> > >
> > > ifdef CONFIG_CC_IS_CLANG
> > > -KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
> > > -KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
> > > -KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
> > > +KBUILD_CPPFLAGS += -Qunused-arguments
> > > +KBUILD_CFLAGS += -Wno-format-invalid-specifier
> > > +KBUILD_CFLAGS += -Wno-gnu
> > > # Quiet clang warning: comparison of unsigned expression < 0 is always
> > > false
> > > -KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
> > > +KBUILD_CFLAGS += -Wno-tautological-compare
> > > # CLANG uses a _MergedGlobals as optimization, but this breaks modpost,
> > > as
> > > the
> > > # source of a reference will be _MergedGlobals and not on of the
> > > whitelisted names.
> > > # See modpost pattern 2
> > > -KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
> > > +KBUILD_CFLAGS += -mno-global-merge
> > > else
> > >
> > > # These warnings generated too much noise in a regular build.
> > >
> > > Which is what's being done since kernel commit a1494304346a ("kbuild: add
> > > all Clang-specific flags unconditionally"). I actually had this in an
> > > earlier version of this patch series and forgot I removed it.
> > >
> > > This seems to apply to envtools and tools-only as well, though make
> > > prompts
> > > me for the desired state of symbols that are now reachable, e.g.
> > > ARM64_CRC32. And if I rerun the same command, then it works. It seems like
> > > the config from the previous run is used? I don't know if it's related but
> > > those two commands call make directly ($(Q)$(MAKE) $(build)=<path>). Do
> > > you
> > > have something in mind maybe? Or some more commands to run?
> >
> > I think I partly misunderstood at first. It's not that we switch from
> > one toolchain to another, it's that we can't (as easily) use gcc for the
> > target and clang for host tools (and vice-versa) because of how flags
> > are set now, yes? If so, how does this work in the kernel?
> >
>
> I'm not sure what's happening so it's quite difficult to put into words.
>
> Apply the following to the master branch:
>
> diff --git a/Makefile b/Makefile
> index 49d9740327e..9a2367f0a97 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -999,15 +999,15 @@ KBUILD_CFLAGS += $(call
> cc-option,-Wno-format-nonliteral)
> KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member)
>
> ifdef CONFIG_CC_IS_CLANG
> -KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
> -KBUILD_CFLAGS += $(call cc-disable-warning, format-invalid-specifier)
> -KBUILD_CFLAGS += $(call cc-disable-warning, gnu)
> +KBUILD_CPPFLAGS += -Qunused-arguments
> +KBUILD_CFLAGS += -Wno-format-invalid-specifier
> +KBUILD_CFLAGS += -Wno-gnu
> # Quiet clang warning: comparison of unsigned expression < 0 is always
> false
> -KBUILD_CFLAGS += $(call cc-disable-warning, tautological-compare)
> +KBUILD_CFLAGS += -Wno-tautological-compare
> # CLANG uses a _MergedGlobals as optimization, but this breaks modpost, as
> the
> # source of a reference will be _MergedGlobals and not on of the
> whitelisted names.
> # See modpost pattern 2
> -KBUILD_CFLAGS += $(call cc-option, -mno-global-merge,)
> +KBUILD_CFLAGS += -mno-global-merge
> KBUILD_CFLAGS += $(call cc-option, -fcatch-undefined-behavior)
> KBUILD_CFLAGS += $(call cc-disable-warning, deprecated-non-prototype)
> else
>
>
> What I do:
>
> make CROSS_COMPILE="aarch64-linux-gnu-" O=build/puma HOSTCC=clang CC=clang
> puma-rk3399_defconfig
> make CROSS_COMPILE="aarch64-linux-gnu-" O=build/puma HOSTCC=clang CC=clang
> V=1
> make CROSS_COMPILE="aarch64-linux-gnu-" O=build/puma V=1
>
> That is, I configure the defconfig with clang selected as toolchain,
> (successfully) build U-Boot with clang, then rebuild switching to gcc.
>
> What happens is that the last make command prompts me for Kconfig symbols
> that are now reachable and thus kconfig doesn't know what to do with them.
>
> See the (NEW) entries below:
>
> scripts/kconfig/conf --syncconfig Kconfig
> *
> * Restart config...
> *
> *
> * ARM architecture
> *
> Enable support for CRC32 instruction (ARM64_CRC32) [Y/n/?] (NEW)
>
> Timer clock frequency (COUNTER_FREQUENCY) [24000000] 24000000
> Generate position-independent pre-relocation code (POSITION_INDEPENDENT)
> [N/y/?] n
> Specify the early stack pointer relative to the .bss section
> (INIT_SP_RELATIVE) [N/y/?] n
> Emit virtualizable instructions (KVM_VIRT_INS) [N/y/?] n
> ARM GICV2 driver (DRIVER_GICV2) [N/y/?] n
> ARM GICV3 ITS (GIC_V3_ITS) [N/y/?] n
> ARM GICV3 GIC600 SUPPORT (GICV3_SUPPORT_GIC600) [N/y/?] n
> Do not enable icache (SYS_ICACHE_OFF) [N/y/?] n
> Do not enable icache in SPL (SPL_SYS_ICACHE_OFF) [N/y/?] n
> Do not enable dcache (SYS_DCACHE_OFF) [N/y/?] n
> Do not enable dcache in SPL (SPL_SYS_DCACHE_OFF) [N/y/?] n
> CP15 based cache enabling support (SYS_ARM_CACHE_CP15) [N/y/?] n
> MMU-based Paged Memory Management Support (SYS_ARM_MMU) [N/y/?] n
> Use the ARM v7 PMSA Compliant MPU (SYS_ARM_MPU) [N/y/?] n
> Select the ARM data write cache policy
> > 1. Write-back (WB) (SYS_ARM_CACHE_WRITEBACK)
> 2. Write-through (WT) (SYS_ARM_CACHE_WRITETHROUGH)
> 3. Write allocation (WA) (SYS_ARM_CACHE_WRITEALLOC)
> choice[1-3?]: 1
> Enable ARCH_CPU_INIT (ARCH_CPU_INIT) [N/y/?] n
> ARM Generic Timer support (SYS_ARCH_TIMER) [Y/n/?] y
> Support for ARM SMC Calling Convention (SMCCC) (ARM_SMCCC) [Y/?] y
> ARM PL310 L2 cache controller (SYS_L2_PL310) [N/y/?] n
> ARM PL310 L2 cache controller in SPL (SPL_SYS_L2_PL310) [N/y/?] n
> L2cache off (SYS_L2CACHE_OFF) [N/y/?] n
> prepare BOOT0 header (ENABLE_ARM_SOC_BOOT0_HOOK) [Y/?] y
> Use an assembly optimized implementation of memcpy (USE_ARCH_MEMCPY) [N/y/?]
> (NEW)
>
> Use an assembly optimized implementation of memcpy for SPL
> (SPL_USE_ARCH_MEMCPY) [N/y/?] n
> Use an assembly optimized implementation of memcpy for TPL
> (TPL_USE_ARCH_MEMCPY) [N/y/?] n
> Use an assembly optimized implementation of memset (USE_ARCH_MEMSET) [N/y/?]
> (NEW)
>
> Use an assembly optimized implementation of memset for SPL
> (SPL_USE_ARCH_MEMSET) [N/y/?] n
> Use an assembly optimized implementation of memset for TPL
> (TPL_USE_ARCH_MEMSET) [N/y/?] n
> ARM64 system support AArch32 execution state (ARM64_SUPPORT_AARCH32) [Y/n/?]
> y
> Target select
> 1. Airoha SoCs (ARCH_AIROHA)
> 2. Atmel AT91 (ARCH_AT91)
> 3. TI DaVinci (ARCH_DAVINCI)
> 4. Hisilicon HiSTB SoCs (ARCH_HISTB)
> 5. Marvell Kirkwood (ARCH_KIRKWOOD)
> 6. Marvell MVEBU family (Armada XP/375/38x/3700/7K/8K) (ARCH_MVEBU)
> 7. Broadcom BCM283X family (ARCH_BCM283X)
> 8. Broadcom BCM7XXX family (ARCH_BCMSTB)
> 9. Broadcom broadband chip family (ARCH_BCMBCA)
> 10. Support vexpress_ca9x4 (TARGET_VEXPRESS_CA9X4)
> 11. Support Broadcom Northstar (TARGET_BCMNS)
> 12. Support Broadcom NS3 (TARGET_BCMNS3)
> 13. Samsung EXYNOS (ARCH_EXYNOS)
> 14. Samsung S5PC1XX (ARCH_S5PC1XX)
> 15. Calxeda Highbank (ARCH_HIGHBANK)
> 16. ARM Ltd. Integrator family (ARCH_INTEGRATOR)
> 17. Qualcomm IPQ40xx SoCs (ARCH_IPQ40XX)
> 18. TI Keystone (ARCH_KEYSTONE)
> 19. Texas Instruments' K3 Architecture (ARCH_K3)
> 20. TI OMAP2+ (ARCH_OMAP2PLUS)
> 21. Amlogic Meson (ARCH_MESON)
> 22. MediaTek SoCs (ARCH_MEDIATEK)
> 23. Marvell MMP (ARCH_MMP)
> 24. NXP LPC32xx platform (ARCH_LPC32XX)
> 25. NXP i.MX8 platform (ARCH_IMX8)
> 26. NXP i.MX8M platform (ARCH_IMX8M)
> 27. NXP i.MX8ULP platform (ARCH_IMX8ULP)
> 28. NXP i.MX9 platform (ARCH_IMX9)
> 29. NXP i.MXRT platform (ARCH_IMXRT)
> 30. NXP i.MX23 family (ARCH_MX23)
> 31. NXP i.MX28 family (ARCH_MX28)
> 32. NXP MX7ULP (ARCH_MX7ULP)
> 33. Freescale MX7 (ARCH_MX7)
> 34. Freescale MX6 (ARCH_MX6)
> 35. Freescale MX5 (ARCH_MX5)
> 36. Nexell S5P4418/S5P6818 SoC (ARCH_NEXELL)
> 37. Support Nuvoton SoCs (ARCH_NPCM)
> 38. Apple SoCs (ARCH_APPLE)
> 39. Actions Semi OWL SoCs (ARCH_OWL)
> 40. QEMU Virtual Platform (ARCH_QEMU)
> 41. Renesas ARM SoCs (ARCH_RENESAS)
> 42. Qualcomm Snapdragon SoCs (ARCH_SNAPDRAGON)
> 43. Altera SOCFPGA family (ARCH_SOCFPGA)
> 44. Support sunxi (Allwinner) SoCs (ARCH_SUNXI)
> 45. ST-Ericsson U8500 Series (ARCH_U8500)
> 46. Support Xilinx Versal Platform (ARCH_VERSAL)
> 47. Support AMD Versal Gen 2 Platform (ARCH_VERSAL2)
> 48. Support Xilinx Versal NET Platform (ARCH_VERSAL_NET)
> 49. Freescale Vybrid (ARCH_VF610)
> 50. Xilinx Zynq based platform (ARCH_ZYNQ)
> 51. Xilinx ZynqMP R5 based platform (ARCH_ZYNQMP_R5)
> 52. Xilinx ZynqMP based platform (ARCH_ZYNQMP)
> 53. NVIDIA Tegra (ARCH_TEGRA)
> 54. Support ARMv8 Arm Ltd. VExpress based boards and models
> (ARCH_VEXPRESS64)
> 55. Support Corstone1000 Platform (TARGET_CORSTONE1000)
> 56. Support Total Compute Platform (TARGET_TOTAL_COMPUTE)
> 57. Support ls2080a_emu (TARGET_LS2080A_EMU)
> 58. Support ls1088aqds (TARGET_LS1088AQDS)
> 59. Support ls2080aqds (TARGET_LS2080AQDS)
> 60. Support ls2080ardb (TARGET_LS2080ARDB)
> 61. Support ls2081ardb (TARGET_LS2081ARDB)
> 62. Support lx2160ardb (TARGET_LX2160ARDB)
> 63. Support lx2160aqds (TARGET_LX2160AQDS)
> 64. Support lx2162aqds (TARGET_LX2162AQDS)
> 65. Support HiKey 96boards Consumer Edition Platform (TARGET_HIKEY)
> 66. Support HiKey960 96boards Consumer Edition Platform (TARGET_HIKEY960)
> 67. Support Poplar 96boards Enterprise Edition Platform (TARGET_POPLAR)
> 68. Support ls1012aqds (TARGET_LS1012AQDS)
> 69. Support ls1012ardb (TARGET_LS1012ARDB)
> 70. Support ls1012a2g5rdb (TARGET_LS1012A2G5RDB)
> 71. Support ls1012afrwy (TARGET_LS1012AFRWY)
> 72. Support ls1012afrdm (TARGET_LS1012AFRDM)
> 73. Support ls1028aqds (TARGET_LS1028AQDS)
> 74. Support ls1028ardb (TARGET_LS1028ARDB)
> 75. Support ls1088ardb (TARGET_LS1088ARDB)
> 76. Support ls1021aqds (TARGET_LS1021AQDS)
> 77. Support ls1021atwr (TARGET_LS1021ATWR)
> 78. Support Hitachi-Powergrids SELI8 service unit card
> (TARGET_PG_WCOM_SELI8)
> 79. Support Hitachi-Powergrids EXPU1 service unit card
> (TARGET_PG_WCOM_EXPU1)
> 80. Support ls1021atsn (TARGET_LS1021ATSN)
> 81. Support ls1021aiot (TARGET_LS1021AIOT)
> 82. Support ls1043aqds (TARGET_LS1043AQDS)
> 83. Support ls1043ardb (TARGET_LS1043ARDB)
> 84. Support ls1046aqds (TARGET_LS1046AQDS)
> 85. Support ls1046ardb (TARGET_LS1046ARDB)
> 86. Support ls1046afrwy (TARGET_LS1046AFRWY)
> 87. Analog Devices SC5XX-processor family (ARCH_SC5XX)
> 88. Support sl28 (TARGET_SL28)
> 89. Support ten64 (TARGET_TEN64)
> 90. Socionext UniPhier SoCs (ARCH_UNIPHIER)
> 91. Socionext SynQuacer SoCs (ARCH_SYNQUACER)
> 92. Support STMicroelectronics STM32 MCU with cortex M (ARCH_STM32)
> 93. Support STMicroelectronics SoCs (ARCH_STI)
> 94. Support STMicroelectronics STM32MP Socs with cortex A (ARCH_STM32MP)
> > 95. Support Rockchip SoCs (ARCH_ROCKCHIP)
> 96. Support OcteonTX SoCs (ARCH_OCTEONTX)
> 97. Support OcteonTX2 SoCs (ARCH_OCTEONTX2)
> 98. Support ThunderX 88xx (TARGET_THUNDERX_88XX)
> 99. Support Aspeed SoCs (ARCH_ASPEED)
> 100. Support Phytium Durian Platform (TARGET_DURIAN)
> 101. Support Phytium Pomelo Platform (TARGET_POMELO)
> 102. Support Phytium PE2201 Platform (TARGET_PE2201)
> 103. Support Cortina Presidio ASIC Platform (TARGET_PRESIDIO_ASIC)
> 104. Xen guest ARM64 (TARGET_XENGUEST_ARM64)
> 105. Support HPE GXP SoCs (ARCH_GXP)
> choice[1-105?]: 95
> Support Rockchip PX30 (ROCKCHIP_PX30) [N/y/?] n
> Support Rockchip RK3036 (ROCKCHIP_RK3036) [N/y/?] n
> Support Rockchip RK3066 (ROCKCHIP_RK3066) [N/y/?] n
> Support Rockchip RK3128 (ROCKCHIP_RK3128) [N/y/?] n
> Support Rockchip RK3188 (ROCKCHIP_RK3188) [N/y/?] n
> Support Rockchip RK3228/RK3229 (ROCKCHIP_RK322X) [N/y/?] n
> Support Rockchip RK3288 (ROCKCHIP_RK3288) [N/y/?] n
> Support Rockchip RK3308 (ROCKCHIP_RK3308) [N/y/?] n
> Support Rockchip RK3328 (ROCKCHIP_RK3328) [N/y/?] n
> Support Rockchip RK3368 (ROCKCHIP_RK3368) [N/y/?] n
> Support Rockchip RK3399 (ROCKCHIP_RK3399) [Y/n/?] y
> Support Rockchip RK3506 (ROCKCHIP_RK3506) [N/y/?] n
> Support Rockchip RK3528 (ROCKCHIP_RK3528) [N/y/?] n
> Support Rockchip RK3568 (ROCKCHIP_RK3568) [N/y/?] n
> Support Rockchip RK3576 (ROCKCHIP_RK3576) [N/y/?] n
> Support Rockchip RK3588 (ROCKCHIP_RK3588) [N/y/?] n
> Support Rockchip RV1108 (ROCKCHIP_RV1108) [N/y/?] n
> Support Rockchip RV1126 (ROCKCHIP_RV1126) [N/y/?] n
> Route uart output to usb pins (ROCKCHIP_USB_UART) [N/y/?] n
> SPL returns to bootrom (SPL_ROCKCHIP_BACK_TO_BROM) [N/y/?] n
> TPL returns to bootrom (TPL_ROCKCHIP_BACK_TO_BROM) [Y/n/?] y
> Rockchip common board file (ROCKCHIP_COMMON_BOARD) [Y/n/?] y
> Rockchip SPL common board file (SPL_ROCKCHIP_COMMON_BOARD) [Y/n/?] y
> Rockchip TPL common board file (TPL_ROCKCHIP_COMMON_BOARD) [Y/n/?] y
> Use external TPL binary (ROCKCHIP_EXTERNAL_TPL) [N/y/?] n
> Rockchip boot mode flag register address (ROCKCHIP_BOOT_MODE_REG) [0x0] 0x0
> Disable device boot on power plug-in
> (ROCKCHIP_RK8XX_DISABLE_BOOT_ON_POWERON) [N/y/?] n
> Rockchip STIMER support (ROCKCHIP_STIMER) [Y/n/?] y
> Size of IRAM reserved in SPL (ROCKCHIP_SPL_RESERVE_IRAM) [0x0] 0x0
> SPL requires early-return (for RK3188-style BROM) to BROM
> (SPL_ROCKCHIP_EARLYRETURN_TO_BROM) [N/y/?] n
> Disable force_jtag feature (ROCKCHIP_DISABLE_FORCE_JTAG) [Y/n/?] y
> TPL requires early-return (for RK3188-style BROM) to BROM
> (TPL_ROCKCHIP_EARLYRETURN_TO_BROM) [N/y/?] n
> Build a SPI image for rockchip (ROCKCHIP_SPI_IMAGE) [Y/n/?] y
> Build a maskrom mode image for Rockchip (ROCKCHIP_MASKROM_IMAGE) [N/y/?] n
> RK3399 board select
> 1. Asus Flip C101PA Chromebook (RK3399) (TARGET_CHROMEBOOK_BOB)
> 2. Samsung Chromebook Plus (RK3399) (TARGET_CHROMEBOOK_KEVIN)
> 3. RK3399 evaluation board (TARGET_EVB_RK3399)
> 4. Pinebook Pro (TARGET_PINEBOOK_PRO_RK3399)
> 5. PinePhone Pro (TARGET_PINEPHONE_PRO_RK3399)
> > 6. Theobroma Systems RK3399-Q7 (Puma) (TARGET_PUMA_RK3399)
> 7. Vamrs Limited Rock960 board family (TARGET_ROCK960_RK3399)
> 8. Radxa ROCK Pi 4 board (TARGET_ROCKPI4_RK3399)
> 9. Pine64 Rockpro64 board (TARGET_ROCKPRO64_RK3399)
> 10. Firefly ROC-RK3399-PC board (TARGET_ROC_PC_RK3399)
> choice[1-10?]: 6
> Theobroma Systems RK3399-Q7 DDR Option
> > 1. DDR3-1333MHz (TARGET_PUMA_RK3399_RAM_DDR3_1333)
> 2. DDR3-1600MHz (TARGET_PUMA_RK3399_RAM_DDR3_1600)
> 3. DDR3-1866MHz (TARGET_PUMA_RK3399_RAM_DDR3_1866)
> choice[1-3?]: 1
> Force cache maintenance to be exclusively by VA (CMO_BY_VA_ONLY) [N/y/?] n
> Fix broken ARMv8 generic timer (ARMV8_CNTFRQ_BROKEN) [N/y/?] n
> Install crash dump exception vectors (ARMV8_SPL_EXCEPTION_VECTORS) [N/y/?] n
> Enable multiple CPUs to enter into U-Boot (ARMV8_MULTIENTRY) [N/y/?] n
> Enable data coherency with other cores in cluster (ARMV8_SET_SMPEN) [Y/n/?]
> y
> Enable switching to running in EL1 (ARMV8_SWITCH_TO_EL1) [N/y/?] n
> Use PSCI for reset and shutdown (PSCI_RESET) [Y/n/?] y
> Enable PSCI support (ARMV8_PSCI) [N/y/?] n
> External aborts and SError interrupt exception are taken in EL3
> (ARMV8_EA_EL3_FIRST) [N/y/?] n
> Use the event stream for udelay (ARMV8_UDELAY_EVENT_STREAM) [N/y/?] n
> *
> * General setup
> *
> Compile also drivers which will not load (COMPILE_TEST) [N/y/?] n
> Compile U-Boot with warnings as errors (WERROR) [N/y/?] n
> Local version - append to U-Boot release (LOCALVERSION) []
> Automatically append version information to the version string
> (LOCALVERSION_AUTO) [Y/n/?] y
> Optimization level
> > 1. Optimize for size (CC_OPTIMIZE_FOR_SIZE)
> 2. Optimize for speed (CC_OPTIMIZE_FOR_SPEED)
> 3. Optimize for debugging (CC_OPTIMIZE_FOR_DEBUG)
> choice[1-3?]: 1
> Allow compiler to uninline functions marked 'inline' in full U-Boot
> (OPTIMIZE_INLINING) [N/y/?] n
> Allow compiler to uninline functions marked 'inline' in SPL
> (SPL_OPTIMIZE_INLINING) [N/y/?] n
> Allow compiler to uninline functions marked 'inline' in TPL
> (TPL_OPTIMIZE_INLINING) [N/y/?] n
> Enable Link Time Optimizations (LTO) [N/y/?] n
> Select U-Boot be run as a bootloader for XEN Virtual Machine (XEN) [N/y/?] n
> Add arch, board, vendor and soc variables to default environment
> (ENV_VARS_UBOOT_CONFIG) [Y/?] y
> Number of DRAM banks (NR_DRAM_BANKS) [1] 1
> Enable kernel command line setup (SYS_BOOT_GET_CMDLINE) [N/y/?] n
> Enable kernel board information setup (SYS_BOOT_GET_KBD) [N/y/?] n
> Use a custom location for the initial stack pointer address
> (HAS_CUSTOM_SYS_INIT_SP_ADDR) [Y/?] y
> Static location for the initial stack pointer (CUSTOM_SYS_INIT_SP_ADDR)
> [0x03f00000] 0x03f00000
> Enable malloc() pool before relocation (SYS_MALLOC_F) [Y/?] y
> Size of malloc() pool before relocation (SYS_MALLOC_F_LEN) [0x10000]
> 0x10000
> Define memory for Dynamic allocation (SYS_MALLOC_LEN) [0x2000000] 0x2000000
> Enable malloc() pool in SPL (SPL_SYS_MALLOC_F) [Y/n/?] y
> Size of malloc() pool in SPL (SPL_SYS_MALLOC_F_LEN) [0x8000] 0x8000
> Enable malloc() pool in TPL (TPL_SYS_MALLOC_F) [Y/n/?] y
> Size of malloc() pool in TPL (TPL_SYS_MALLOC_F_LEN) [0x4000] 0x4000
> Inform valgrind about memory allocations (VALGRIND) [N/y/?] n
> 64bit physical address support (PHYS_64BIT) [Y/?] y
> 64bit fdt address support (FDT_64BIT) [Y/?] y
> SPL image used in the combined SPL+U-Boot image (SPL_IMAGE)
> [spl/u-boot-spl.bin] spl/u-boot-spl.bin
> Recreate an ELF image from raw U-Boot binary (REMAKE_ELF) [N/y/?] n
> Build target special images (BUILD_TARGET) []
> Define a maximum size for the U-Boot image (HAS_BOARD_SIZE_LIMIT) [N/y/?] n
> Use a custom location for the U-Boot linker script (SYS_CUSTOM_LDSCRIPT)
> [N/y/?] n
> Address in memory to use by default (SYS_LOAD_ADDR) [0x800800] 0x800800
> Define max stack size that can be used by U-Boot (STACK_SIZE) [0x1000000]
> 0x1000000
> Exclude some memory from U-Boot / OS information (SYS_MEM_TOP_HIDE) [0x0]
> 0x0
> Maximum size in bytes reserved for U-Boot in memory (SYS_MONITOR_LEN) [0] 0
> Support for multiprocessor (MP) [N/y/?] n
> Text Base (TEXT_BASE) [0x00800000] 0x00800000
> Use custom U-Boot Start (HAVE_SYS_UBOOT_START) [N/y/?] n
> Determine CPU clock frequency at run-time (DYNAMIC_SYS_CLK_FREQ) [N/y/?] n
> CPU clock frequency (SYS_CLK_FREQ) [0] 0
> Enable U-Boot API (API) [N/y/?] (NEW)
>
> Then it continues with the build, but using the flags for clang while using
> GCC, see:
>
> make -f /home/qschulz/work/upstream/u-boot/scripts/Makefile.autoconf || \
> { rm -f include/config/auto.conf; false; }
> mkdir -p include/asm
> if [ -d /home/qschulz/work/upstream/u-boot/arch/arm/mach-rk3399/include/mach
> ]; then \
> dest=arch/arm/mach-rk3399/include/mach; \
> else \
> dest=arch/arm/include/asm/arch-rk3399; \
> fi; \
> ln -fsn /home/qschulz/work/upstream/u-boot/$dest include/asm/arch
> set -e; mkdir -p include/; trap "rm -f include/.config.h.tmp" EXIT; { (echo
> "/* Automatically generated - do not edit */"; echo \#define CFG_BOARDDIR
> board/theobroma-systems/puma_rk3399; echo \#include
> \<configs/"puma_rk3399".h\> ; echo \#include \<asm/config.h\>; echo
> \#include \<linux/kconfig.h\>; echo \#include \<config_fallbacks.h\>;); } >
> include/.config.h.tmp; if [ ! -r include/config.h ] || ! cmp -s
> include/config.h include/.config.h.tmp; then : ' UPD include/config.h'; mv
> -f include/.config.h.tmp include/config.h; fi
> aarch64-linux-gnu-gcc -E -Wall -Werror=strict-prototypes -Wno-trigraphs
> -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE
> -Werror=implicit-function-declaration -Werror=implicit-int
> -Wno-format-security -std=gnu11 -ffreestanding -fno-builtin
> -fno-delete-null-pointer-checks -Wno-frame-address -Wno-format-truncation
> -Wno-format-overflow -Wno-int-in-bool-context -Wno-address-of-packed-member
> -Os -fno-stack-protector -fno-delete-null-pointer-checks
> -Wno-zero-length-bounds -Wno-array-bounds -Wno-stringop-overflow
> -Wno-maybe-uninitialized
> -fmacro-prefix-map=/home/qschulz/work/upstream/u-boot/= -gdwarf-4
> -fstack-usage -Wno-format-nonliteral -Wno-address-of-packed-member
> -Wno-format-invalid-specifier -Wno-gnu -Wno-tautological-compare
> -mno-global-merge -Wno-pointer-sign -D__KERNEL__ -D__UBOOT__
> -Qunused-arguments -D__ARM__ -ffunction-sections -fdata-sections
> -fno-common -ffixed-x18 -pipe -Iinclude
> -I/home/qschulz/work/upstream/u-boot/include
> -I/home/qschulz/work/upstream/u-boot/arch/arm/include -include
> /home/qschulz/work/upstream/u-boot/include/linux/kconfig.h -nostdinc
> -isystem /usr/lib/gcc/aarch64-linux-gnu/15/include -DDO_DEPS_ONLY -dM
> include/config.h > u-boot.cfg.tmp && { grep 'define CONFIG_' u-boot.cfg.tmp
> | sed '/define CONFIG_IS_ENABLED(/d;/define CONFIG_IF_ENABLED_INT(/d;/define
> CONFIG_VAL(/d;' > u-boot.cfg; rm u-boot.cfg.tmp; } || { rm u-boot.cfg.tmp;
> false; }
> aarch64-linux-gnu-gcc: error: unrecognized command-line option
> ‘-mno-global-merge’; did you mean ‘-Wno-global-module’?
> aarch64-linux-gnu-gcc: error: unrecognized command-line option
> ‘-Qunused-arguments’
> make[2]: ***
> [/home/qschulz/work/upstream/u-boot/scripts/Makefile.autoconf:84:
> u-boot.cfg] Error 1
> make[1]: *** No rule to make target 'include/config/auto.conf', needed by
> 'include/config/uboot.release'. Stop.
> make: *** [Makefile:189: __sub-make] Error 2
>
> If I do nothing but call
> make CROSS_COMPILE="aarch64-linux-gnu-" O=build/puma V=1
> again, it'll work just fine and compile with GCC flags with the GCC
> toolchain (well, I don't get an error anymore, so I'm assumign that what's
> happening :) ). So it seems to me that the symbols as used in Makefile
> depend on the previous make command generating the .config and syncconfig is
> running "too late".
>
> Contrary to what I initially thought, it's not actually related to U-Boot
> host tools.
>
> I'm not attempting to mix GCC and clang for host/target building, and I
> don't know if this would work in any case. I don't know if this is something
> we want to support anyway. As for what the Linux kernel does, they
> document[1] LLVM/clang support by telling the user to essentially use LLVM=1
> which they claim is an alias to:
> CC=clang LD=ld.lld AR=llvm-ar NM=llvm-nm STRIP=llvm-strip \
> OBJCOPY=llvm-objcopy OBJDUMP=llvm-objdump READELF=llvm-readelf \
> HOSTCC=clang HOSTCXX=clang++ HOSTAR=llvm-ar HOSTLD=ld.lld
>
> They don't really hint at CC and HOSTCC being different as being an option.
> Maybe it works, maybe it doesn't?
>
> I did test in the Linux kernel whether they had the same issue but it
> doesn't seem like it is the case.
>
> [1] https://www.kernel.org/doc/html/latest/kbuild/llvm.htmlAh, thanks. I'm tempted to say this is something that'll just not work until we can also switch to following the kernel way of invoking clang? But maybe it's a problem missing dependencies somewhere (not leading to some cmd file being recreated in time), rather than more missing changes. -- Tom
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