Re: Compiling kernel-3.4.xxx with gcc-9.x. Need some help.

[Andy Shevchenko <andy.shevchenko@gmail.com>]

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On Sunday, March 28, 2021, Fawad Lateef <fawadlateef@gmail.com> wrote:

> Hi
>
> I am using an Olimex A20 SOM with NAND and due to some binary blob for
> NAND driver, I am stuck with the sunxi kernel 3.4.xxx version. (Repo
> here: https://github.com/linux-sunxi/linux-sunxi)
>
> I am currently using buildroot-2016 and gcc-5.5 for building the
> kernel and every other package needed.
>
> Now the requirement is to move to the latest version of gcc-9.x, so
> that we can have glibc++ provided by the gcc-9.1 toolchain.
>
> Main problem for moving to later versions of buildroot is the kernel
> 3.4 which we couldn't to work with gcc-6 a few years ago _but_ now the
> gcc-9.1 requirement is mandatory so now have to look into compiling
> linux-3.4 with gcc-9.1 or above.
>
> Now I need some help.
>
> -- Is it realistic to expect 3.4 kernel compiling and boot
> successfully with gcc-9.1?


Pretty much, but i’m not sure the patches will be acceptable by upstream /
stable.


> -- Secondly, till now I am able to compile until the point when its
> going to generate the vmlinuz image, it failed with error at LD stage:
>                   arm-none-linux-gnueabihf-ld: no machine record defined
>
> Last few lines from compile log:
>
> ------------------------------------------------------------
> -------------------
> include/linux/init.h:267:24: note: in expansion of macro ‘__initcall’
>   267 | #define module_init(x) __initcall(x);
>       |                        ^~~~~~~~~~
> net/sunrpc/auth_gss/auth_gss.c:1721:1: note: in expansion of macro
> ‘module_init’
>  1721 | module_init(init_rpcsec_gss)
>       | ^~~~~~~~~~~
> In file included from include/linux/kernel.h:20,
>                  from include/linux/spinlock.h:55,
>                  from include/linux/mmzone.h:7,
>                  from include/linux/gfp.h:4,
>                  from include/linux/slab.h:12,
>                  from net/sunrpc/auth_gss/svcauth_gss.c:40:
> include/linux/log2.h:22:1: warning: ignoring attribute ‘noreturn’
> because it conflicts with attribute ‘const’ [-Wattributes]
>    22 | int ____ilog2_NaN(void);
>       | ^~~
>   LD      net/sunrpc/auth_gss/auth_rpcgss.o
>   LD      net/sunrpc/auth_gss/built-in.o
>   LD      net/sunrpc/built-in.o
>   LD      net/built-in.o
>   LD      vmlinux.o
>   MODPOST vmlinux.o
>   GEN     .version
>   CHK     include/generated/compile.h
>   UPD     include/generated/compile.h
>   CC      init/version.o
> In file included from include/linux/kernel.h:20,
>                  from include/linux/cache.h:4,
>                  from include/linux/time.h:7,
>                  from include/linux/stat.h:60,
>                  from include/linux/module.h:10,
>                  from init/version.c:10:
> include/linux/log2.h:22:1: warning: ignoring attribute ‘noreturn’
> because it conflicts with attribute ‘const’ [-Wattributes]
>    22 | int ____ilog2_NaN(void);
>       | ^~~
>   LD      init/built-in.o
>   LD      .tmp_vmlinux1
> arm-none-linux-gnueabihf-ld: no machine record defined
> Makefile:875: recipe for target '.tmp_vmlinux1' failed
> make: *** [.tmp_vmlinux1] Error 1
> ------------------------------------------------------------
> -------------------
>
>
> After some investigation I found that the MACHINE_START macro from
> arch/arm/include/asm/mach/arch.h  is optimised by compiler and removed
> from the object file during compilation of
> "arch/arm/plat-sunxi/core.c" due to the error here:
>
> ---------------------------------------------------------------
>
> flateef@flateef-XPS-13-9360:~/src/tmp/linux-custom-venus-gc-9.2$ make
> ARCH=arm CROSS_COMPILE=arm-none-linux-gnueabihf- EXTRAVERSION=-custom1
> uImage LOADADDR="0x40008000" -j4
>   CHK     include/linux/version.h
>   CHK     include/generated/utsrelease.h
> make[1]: 'include/generated/mach-types.h' is up to date.
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   CC      arch/arm/plat-sunxi/core.o
> In file included from include/linux/kernel.h:20,
>                  from arch/arm/plat-sunxi/core.c:20:
> include/linux/log2.h:22:1: warning: ignoring attribute ‘noreturn’
> because it conflicts with attribute ‘const’ [-Wattributes]
>    22 | int ____ilog2_NaN(void);
>       | ^~~
> In file included from include/linux/scatterlist.h:10,
>                  from include/linux/dma-mapping.h:9,
>                  from arch/arm/plat-sunxi/core.c:24:
> arch/arm/plat-sunxi/core.c: In function ‘sw_irq_unmask’:
> arch/arm/plat-sunxi/core.c:287:14: warning: left shift count >= width
> of type [-Wshift-count-overflow]
>   287 |    writel((1 << SW_INT_IRQNO_ENMI), SW_INT_IRQ_PENDING_REG0);
>       |              ^~
> /home/flateef/src/tmp/linux-custom-venus-gc-9.2/arch/arm/
> include/asm/io.h:52:88:
> note: in definition of macro ‘__raw_writel’
>    52 | #define __raw_writel(v,a) (__chk_io_ptr(a), *(volatile
> unsigned int __force   *)(a) = (v))
>       |
>                         ^
> include/linux/byteorder/generic.h:87:21: note: in expansion of macro
> ‘__cpu_to_le32’
>    87 | #define cpu_to_le32 __cpu_to_le32
>       |                     ^~~~~~~~~~~~~
> /home/flateef/src/tmp/linux-custom-venus-gc-9.2/arch/arm/
> include/asm/io.h:244:36:
> note: in expansion of macro ‘writel_relaxed’
>   244 | #define writel(v,c)  ({ __iowmb(); writel_relaxed(v,c); })
>       |                                    ^~~~~~~~~~~~~~
> arch/arm/plat-sunxi/core.c:287:4: note: in expansion of macro ‘writel’
>   287 |    writel((1 << SW_INT_IRQNO_ENMI), SW_INT_IRQ_PENDING_REG0);
>       |    ^~~~~~
> In file included from arch/arm/plat-sunxi/core.c:53:
> At top level:
> /home/flateef/src/tmp/linux-custom-venus-gc-9.2/arch/arm/
> include/asm/mach/arch.h:69:34:
> warning: ‘__mach_desc_SUN7I’ defined but not used
> [-Wunused-const-variable=]
>    69 | static const struct machine_desc __mach_desc_##_type  \
>       |                                  ^~~~~~~~~~~~
> arch/arm/plat-sunxi/core.c:424:1: note: in expansion of macro
> ‘MACHINE_START’
>   424 | MACHINE_START(SUN7I, "sun7i")
>       | ^~~~~~~~~~~~~
> /home/flateef/src/tmp/linux-custom-venus-gc-9.2/arch/arm/
> include/asm/mach/arch.h:69:34:
> warning: ‘__mach_desc_SUN5I’ defined but not used
> [-Wunused-const-variable=]
>    69 | static const struct machine_desc __mach_desc_##_type  \
>       |                                  ^~~~~~~~~~~~
> arch/arm/plat-sunxi/core.c:410:1: note: in expansion of macro
> ‘MACHINE_START’
>   410 | MACHINE_START(SUN5I, "sun5i")
>       | ^~~~~~~~~~~~~
> /home/flateef/src/tmp/linux-custom-venus-gc-9.2/arch/arm/
> include/asm/mach/arch.h:69:34:
> warning: ‘__mach_desc_SUN4I’ defined but not used
> [-Wunused-const-variable=]
>    69 | static const struct machine_desc __mach_desc_##_type  \
>       |                                  ^~~~~~~~~~~~
> arch/arm/plat-sunxi/core.c:396:1: note: in expansion of macro
> ‘MACHINE_START’
>   396 | MACHINE_START(SUN4I, "sun4i")
>       | ^~~~~~~~~~~~~
>   LD      arch/arm/plat-sunxi/built-in.o
>   LD      vmlinux.o
>   MODPOST vmlinux.o
>   GEN     .version
>   CHK     include/generated/compile.h
>   UPD     include/generated/compile.h
>   CC      init/version.o
> In file included from include/linux/kernel.h:20,
>                  from include/linux/cache.h:4,
>                  from include/linux/time.h:7,
>                  from include/linux/stat.h:60,
>                  from include/linux/module.h:10,
>                  from init/version.c:10:
> include/linux/log2.h:22:1: warning: ignoring attribute ‘noreturn’
> because it conflicts with attribute ‘const’ [-Wattributes]
>    22 | int ____ilog2_NaN(void);
>       | ^~~
>   LD      init/built-in.o
>   LD      .tmp_vmlinux1
> arm-none-linux-gnueabihf-ld: no machine record defined
> Makefile:875: recipe for target '.tmp_vmlinux1' failed
> make: *** [.tmp_vmlinux1] Error 1
>
> ---------------------------------------------------------------
>
> I modified the MACHINE_START macro in arch/arm/include/asm/mach/arch.h
> and added "__attribute__((used))" so it became:
>
>             static const struct machine_desc __mach_desc_##_type
> __attribute__((used))    \
>
> And I managed to get the vmlinux image.
>
> -------------------------------------------------------------
>
>
> arch/arm/mm/mmu.c:919:1: note: in expansion of macro ‘early_param’
>   919 | early_param("vmalloc", early_vmalloc);
>       | ^~~~~~~~~~~
> include/linux/init.h:241:33: warning: ‘__setup_noalign_setup’ defined
> but not used [-Wunused-variable]
>   241 |  static struct obs_kernel_param __setup_##unique_id \
>       |                                 ^~~~~~~~
> include/linux/init.h:247:2: note: in expansion of macro ‘__setup_param’
>   247 |  __setup_param(str, fn, fn, 0)
>       |  ^~~~~~~~~~~~~
> arch/arm/mm/mmu.c:175:1: note: in expansion of macro ‘__setup’
>   175 | __setup("noalign", noalign_setup);
>       | ^~~~~~~
> include/linux/init.h:241:33: warning: ‘__setup_early_ecc’ defined but
> not used [-Wunused-variable]
>   241 |  static struct obs_kernel_param __setup_##unique_id \
>       |                                 ^~~~~~~~
> include/linux/init.h:252:2: note: in expansion of macro ‘__setup_param’
>   252 |  __setup_param(str, fn, fn, 1)
>       |  ^~~~~~~~~~~~~
> arch/arm/mm/mmu.c:165:1: note: in expansion of macro ‘early_param’
>   165 | early_param("ecc", early_ecc);
>       | ^~~~~~~~~~~
> include/linux/init.h:241:33: warning: ‘__setup_early_nowrite’ defined
> but not used [-Wunused-variable]
>   241 |  static struct obs_kernel_param __setup_##unique_id \
>       |                                 ^~~~~~~~
> include/linux/init.h:252:2: note: in expansion of macro ‘__setup_param’
>   252 |  __setup_param(str, fn, fn, 1)
>       |  ^~~~~~~~~~~~~
> arch/arm/mm/mmu.c:154:1: note: in expansion of macro ‘early_param’
>   154 | early_param("nowb", early_nowrite);
>       | ^~~~~~~~~~~
> include/linux/init.h:241:33: warning: ‘__setup_early_nocache’ defined
> but not used [-Wunused-variable]
>   241 |  static struct obs_kernel_param __setup_##unique_id \
>       |                                 ^~~~~~~~
> include/linux/init.h:252:2: note: in expansion of macro ‘__setup_param’
>   252 |  __setup_param(str, fn, fn, 1)
>       |  ^~~~~~~~~~~~~
> arch/arm/mm/mmu.c:145:1: note: in expansion of macro ‘early_param’
>   145 | early_param("nocache", early_nocache);
>       | ^~~~~~~~~~~
> include/linux/init.h:241:33: warning: ‘__setup_early_cachepolicy’
> defined but not used [-Wunused-variable]
>   241 |  static struct obs_kernel_param __setup_##unique_id \
>       |                                 ^~~~~~~~
> include/linux/init.h:252:2: note: in expansion of macro ‘__setup_param’
>   252 |  __setup_param(str, fn, fn, 1)
>       |  ^~~~~~~~~~~~~
> arch/arm/mm/mmu.c:136:1: note: in expansion of macro ‘early_param’
>   136 | early_param("cachepolicy", early_cachepolicy);
>       | ^~~~~~~~~~~
>   AS      arch/arm/kernel/head.o
>   LD      arch/arm/kernel/built-in.o
>   AS      arch/arm/mm/cache-v7.o
>   AS      arch/arm/mm/tlb-v7.o
>   AS      arch/arm/mm/proc-v7.o
>   LD      arch/arm/mm/built-in.o
>   AS      arch/arm/lib/copy_page.o
>   AS      arch/arm/lib/csumpartialcopyuser.o
>   AR      arch/arm/lib/lib.a
>   LD      vmlinux.o
>   MODPOST vmlinux.o
>   GEN     .version
>   CHK     include/generated/compile.h
>   UPD     include/generated/compile.h
>   CC      init/version.o
> In file included from include/linux/kernel.h:20,
>                  from include/linux/cache.h:4,
>                  from include/linux/time.h:7,
>                  from include/linux/stat.h:60,
>                  from include/linux/module.h:10,
>                  from init/version.c:10:
> include/linux/log2.h:22:1: warning: ignoring attribute ‘noreturn’
> because it conflicts with attribute ‘const’ [-Wattributes]
>    22 | int ____ilog2_NaN(void);
>       | ^~~
>   LD      init/built-in.o
>   LD      .tmp_vmlinux1
>   KSYM    .tmp_kallsyms1.S
>   AS      .tmp_kallsyms1.o
>   LD      .tmp_vmlinux2
>   KSYM    .tmp_kallsyms2.S
>   AS      .tmp_kallsyms2.o
>   LD      vmlinux
>   SYSMAP  System.map
>   SYSMAP  .tmp_System.map
>   OBJCOPY arch/arm/boot/Image
>   Kernel: arch/arm/boot/Image is ready
>   AS      arch/arm/boot/compressed/head.o
>   XZKERN  arch/arm/boot/compressed/piggy.xzkern
>   CC      arch/arm/boot/compressed/misc.o
>   CC      arch/arm/boot/compressed/decompress.o
>   CC      arch/arm/boot/compressed/string.o
> In file included from include/linux/kernel.h:20,
>                  from
> arch/arm/boot/compressed/../../../../lib/xz/xz_private.h:15,
>                  from
> arch/arm/boot/compressed/../../../../lib/decompress_unxz.c:145,
>                  from arch/arm/boot/compressed/decompress.c:50:
> include/linux/log2.h:22:1: warning: ignoring attribute ‘noreturn’
> because it conflicts with attribute ‘const’ [-Wattributes]
>    22 | int ____ilog2_NaN(void);
>       | ^~~
>   SHIPPED arch/arm/boot/compressed/lib1funcs.S
>   SHIPPED arch/arm/boot/compressed/ashldi3.S
>   AS      arch/arm/boot/compressed/lib1funcs.o
>   AS      arch/arm/boot/compressed/ashldi3.o
>   AS      arch/arm/boot/compressed/piggy.xzkern.o
>   LD      arch/arm/boot/compressed/vmlinux
>   OBJCOPY arch/arm/boot/zImage
>   Kernel: arch/arm/boot/zImage is ready
>   UIMAGE  arch/arm/boot/uImage
> Image Name:   Linux-3.4.113-custom1
> Created:      Sun Mar 28 20:27:03 2021
> Image Type:   ARM Linux Kernel Image (uncompressed)
> Data Size:    1869496 Bytes = 1825.68 KiB = 1.78 MiB
> Load Address: 40008000
> Entry Point:  40008000
>   Image arch/arm/boot/uImage is ready
>
>
> ------------------------------------------------------------
> -----------------
>
>
> -- I still can't boot the kernel on the platform. I believe its
> because there were lots of warning like above (unused const variables
> etc) and might have removed some other code/functions OR macros?
>
> So please suggest what I can do for compiling working kernel-3.4 with
> gcc-9.


Is it possible to switch to new kernel, like v4.4 or even newer?


>
> Thanks in advance,
>
> -- Fawad Lateef
>


-- 
With Best Regards,
Andy Shevchenko

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