[asterisk-bugs] [JIRA] (DAHLIN-360) Unable to compile: warning about implicit declaration of function (treated as error)

[Sebastian Kemper (JIRA)]

Sebastian Kemper created DAHLIN-360:
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             Summary: Unable to compile: warning about implicit declaration of function (treated as error)
                 Key: DAHLIN-360
                 URL: https://issues.asterisk.org/jira/browse/DAHLIN-360
             Project: DAHDI-Linux
          Issue Type: Bug
      Security Level: None
          Components: General
    Affects Versions: 2.10.0.1
         Environment: OpenWrt trunk, observed when cross-compiling for target mips64_octeon
            Reporter: Sebastian Kemper
            Assignee: Jean Galarneau
            Severity: Minor


Hi all,

There at least one platform where the dahdi-linux build on OpenWrt currently fails (mips64_octeon). But I think this is more related to the used kernel version. Anyway, here's what happens:

  CC [M]  /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/voicebus/voicebus.o
  CC [M]  /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/voicebus/GpakCust.o
  CC [M]  /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/voicebus/GpakApi.o
  CC [M]  /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/voicebus/voicebus_net.o
  CC [M]  /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/voicebus/vpmoct.o
  LD [M]  /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/voicebus/dahdi_voicebus.o
  CC [M]  /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/wcb4xxp/base.o
In file included from /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/wcb4xxp/base.c:38:0:
./arch/mips/include/asm/uaccess.h: In function 'eva_kernel_access':
./arch/mips/include/asm/uaccess.h:91:9: error: implicit declaration of function 'uaccess_kernel' [-Werror=implicit-function-declaration]
  return uaccess_kernel();
         ^
cc1: some warnings being treated as errors
make[6]: *** [scripts/Makefile.build:321: /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/wcb4xxp/base.o] Error 1
make[5]: *** [scripts/Makefile.build:579: /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi/wcb4xxp] Error 2
make[4]: *** [Makefile:1505: _module_/home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/drivers/dahdi] Error 2
make[4]: Leaving directory '/home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/linux-4.14.18'
make[3]: *** [Makefile:74: modules] Error 2
make[3]: Leaving directory '/home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111'
make[2]: *** [Makefile:128: /home/sk/tmp/lede/build_dir/target-mips64_octeon_64_musl/linux-octeon/dahdi-linux-2.11.1-20180111/.built] Error 2

So kernel is 4.14.18 and dahdi-linux is a git snapshot from 11th of January '18.

I googled a bit and found that this also had been observed for openafs by Ubuntu: https://bugs.launchpad.net/ubuntu/+source/openafs/+bug/1711835

They provided a patch for it stating this:

"Subject: [PATCH] Linux: Include linux/uaccess.h rather than asm/uaccess.h

Starting with 4.12 there is a module build error on s390 due to
the arch-specific uaccess.h using a macro defined in the generic
include. The generic include has been around since 2.6.18 and has
always included asm/uaccess.h, so switch to using the generic
include for all kernels which have it."

So I applied what Ubuntu did to openafs to dahdi-linux and got it to build again. Patch will be provided pronto.

Kind regards,
Seb



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