Below are the contents of the make.log file:

DKMS make.log for bcmwl-6.30.223.271+bdcom for kernel 4.15.0-29-generic (x86_64)
Sat Jul 28 22:27:42 WAT 2018
make: Entering directory '/usr/src/linux-headers-4.15.0-29-generic'
Makefile:976: "Cannot use CONFIG_STACK_VALIDATION=y, please install libelf-dev, 
libelf-devel or elfutils-libelf-devel"
CFG80211 API is prefered for this kernel version
Using CFG80211 API
  CC [M]  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.o
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c: In 
function ‘osl_os_get_image_block’:
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:1083:26: 
warning: passing argument 2 of ‘kernel_read’ makes pointer from integer without 
a cast [-Wint-conversion]
  rdlen = kernel_read(fp, fp->f_pos, buf, len);
                          ^
In file included from ./include/linux/huge_mm.h:7:0,
                 from ./include/linux/mm.h:463,
                 from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/include/linuxver.h:65,
                 from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:25:
./include/linux/fs.h:2858:16: note: expected ‘void *’ but argument is of type 
‘loff_t {aka long long int}’
 extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
                ^
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:1083:37: 
warning: passing argument 3 of ‘kernel_read’ makes integer from pointer without 
a cast [-Wint-conversion]
  rdlen = kernel_read(fp, fp->f_pos, buf, len);
                                     ^
In file included from ./include/linux/huge_mm.h:7:0,
                 from ./include/linux/mm.h:463,
                 from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/include/linuxver.h:65,
                 from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:25:
./include/linux/fs.h:2858:16: note: expected ‘size_t {aka long unsigned int}’ 
but argument is of type ‘char *’
 extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
                ^
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:1083:42: 
warning: passing argument 4 of ‘kernel_read’ makes pointer from integer without 
a cast [-Wint-conversion]
  rdlen = kernel_read(fp, fp->f_pos, buf, len);
                                          ^
In file included from ./include/linux/huge_mm.h:7:0,
                 from ./include/linux/mm.h:463,
                 from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/include/linuxver.h:65,
                 from 
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/shared/linux_osl.c:25:
./include/linux/fs.h:2858:16: note: expected ‘loff_t * {aka long long int *}’ 
but argument is of type ‘int’
 extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
                ^
  CC [M]  /var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.o
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c: In function 
‘wl_init_timer’:
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:2359:2: 
error: implicit declaration of function ‘init_timer’ 
[-Werror=implicit-function-declaration]
  init_timer(&t->timer);
  ^
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:2360:10: 
error: ‘struct timer_list’ has no member named ‘data’
  t->timer.data = (ulong) t;
          ^
/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.c:2361:20: 
error: assignment from incompatible pointer type 
[-Werror=incompatible-pointer-types]
  t->timer.function = wl_timer;
                    ^
cc1: some warnings being treated as errors
scripts/Makefile.build:332: recipe for target 
'/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.o' failed
make[1]: *** 
[/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build/src/wl/sys/wl_linux.o] Error 1
Makefile:1552: recipe for target 
'_module_/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build' failed
make: *** [_module_/var/lib/dkms/bcmwl/6.30.223.271+bdcom/build] Error 2
make: Leaving directory '/usr/src/linux-headers-4.15.0-29-generic'

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https://bugs.launchpad.net/bugs/1769428

Title:
  bcmwl-kernel-source 6.30.223.271+bdcom-0ubuntu1~1.1: bcmwl kernel
  module failed to build [wl_cfg80211_hybrid.c:1799:25: error:
  initialization from incompatible pointer type]

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