Errors and failure Compiling Arch Linux from git as dkms

[snostormjp]

Linux flexlinux 6.6.9-arch1-1 #1 SMP PREEMPT_DYNAMIC Tue, 02 Jan 2024 02:28:28 +0000 x86_64 GNU/Linux

gcc 13.2.1-3

ch343ser-dkms-git r21.ad5828d-10 (+0 0.00) (Installed: r28.11d4652-1)

resulted in werror
/var/lib/dkms/ch343ser/28.11d4652/build/ch343.c:2004:18: error: initialization of ‘ssize_t ()(struct tty_struct , const u8 , size_t)’ {aka ‘long int ()(struct tty_struct , const unsigned char , long unsigned int)’} from incompatible pointer type ‘int ()(struct tty_struct , const unsigned char *, int)’ [-Werror=incompatible-pointer-types] 2004 | .write = ch343_tty_write, | ^~~~~~~

, adding KBUILD_CFLAGS = -Wno-error provided more but different warnings and errors ././include/linux/compiler_types.h:360:20: error: impossible constraint in ‘asm’ 360 | #define asm_inline asm inline | ^~~ ./arch/x86/include/asm/bug.h:28:9: note: in expansion of macro ‘asm_inline’ 28 | asm_inline volatile("1:\t" ins "\n" \ | ^~~~~~ ./arch/x86/include/asm/bug.h:83:9: note: in expansion of macro ‘_BUG_FLAGS’ 83 | _BUG_FLAGS(ASM_UD2, __flags, ASM_REACHABLE); \ | ^~~~~~ ./include/asm-generic/bug.h:113:17: note: in expansion of macro ‘WARN_FLAGS’ 113 | __WARN_FLAGS(BUGFLAG_ONCE | \ | ^~~~ ./include/linux/thread_info.h:249:13: note: in expansion of macro ‘WARN_ON_ONCE’ 249 | if (WARN_ON_ONCE(bytes > INT_MAX))

d make -C /lib/modules/6.6.9-arch1-1/build M=/var/lib/dkms/ch343ser/28.11d4652/build modules make[1]: Entering directory '/usr/lib/modules/6.6.9-arch1-1/build' CC [M] /var/lib/dkms/ch343ser/28.11d4652/build/ch343.o /var/lib/dkms/ch343ser/28.11d4652/build/ch343.c:2004:18: error: initialization of ‘ssize_t ()(struct tty_struct , const u8 , size_t)’ {aka ‘long int ()(struct tty_struct , const unsigned char , long unsigned int)’} from incompatible pointer type ‘int ()(struct tty_struct , const unsigned char *, int)’ [-Werror=incompatible-pointer-types] 2004 | .write = ch343_tty_write, | ^~~~~~~ /var/lib/dkms/ch343ser/28.11d4652/build/ch343.c:2004:18: note: (near initialization for ‘ch343_ops.write’) cc1: some warnings being treated as errors make[3]: [scripts/Makefile.build:243: /var/lib/dkms/ch343ser/28.11d4652/build/ch343.o] Error 1 make[2]: [/usr/lib/modules/6.6.9-arch1-1/build/Makefile:1913: /var/lib/dkms/ch343ser/28.11d4652/build] Error 2 make[1]: [Makefile:234: __sub-make] Error 2 make[1]: Leaving directory '/usr/lib/modules/6.6.9-arch1-1/build' make: [Makefile:7: all] Error 2

[WCHSoftGroup]

It seems that there is a problem with your system environment. The error message does not point to the ch343.c file itself. Can compiling other drivers such as helloworld be successful?

[snostormjp]

I am uncertain why you think it is just my environment. All other dkms modules compile fine. I will try my Desktop but think it will provide same result. the Werror is with incompatible pointer type with tty_struct. I get the same error in clean download as normal user. Arch Linux generally has newer kernels and base package versions. I compile plenty of code from source, I have not looked to close yet as it has been a long time since I have done C coding, But wanted to open the issue here to document and inform other at least. If there are any recommended setting or flags that woud be helpful

[snostormjp]

Okay retried from my desktop, main difference is I have not updated it to 6.6.9 kernel itis still on 6.5.9 and compilation works. Will try 6.6.10 which is the new LTS maybe it is just 6.6.9 hoping I done need to roll back and can push forward.

[snostormjp]

No luck with 6.6.10 so the newer modules do break the driver build.
make -C /lib/modules/6.6.10-arch1-1/build M=/home/snostorm/Development/ch343ser_linux/driver make: Entering directory '/usr/lib/modules/6.6.10-arch1-1/build' CC [M] /home/snostorm/Development/ch343ser_linux/driver/ch343.o /home/snostorm/Development/ch343ser_linux/driver/ch343.c:2004:18: error: initialization of ‘ssize_t ()(struct tty_struct , const u8 , size_t)’ {aka ‘long int ()(struct tty_struct , const unsigned char , long unsigned int)’} from incompatible pointer type ‘int ()(struct tty_struct , const unsigned char *, int)’ [-Werror=incompatible-pointer-types] 2004 | .write = ch343_tty_write, | ^~~~~~~ /home/snostorm/Development/ch343ser_linux/driver/ch343.c:2004:18: note: (near initialization for ‘ch343_ops.write’) cc1: some warnings being treated as errors make[2]: [scripts/Makefile.build:243: /home/snostorm/Development/ch343ser_linux/driver/ch343.o] Error 1 make[1]: [/usr/lib/modules/6.6.10-arch1-1/build/Makefile:1913: /home/snostorm/Development/ch343ser_linux/driver] Error 2 make: *** [Makefile:234: __sub-make] Error 2 make: Leaving directory '/usr/lib/modules/6.6.10-arch1-1/build'

[snostormjp]

created pull request for fix