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構建環境是Ubuntu 16.04，最新的gcc 5.4.0和GNU Make 3.82。我的目標是可以運行android 4.4的am335x自定義板。我將支持它的android 7.1.1。Android 7.1.1內核編譯錯誤（工具鏈）
該項目是從谷歌Android清單標記android-7.1.1_r46取自內核從msm標記android-7.1.1_r0.63。我使用的交叉編譯器是從prebuilts/gcc/linux-x86/arm/arm-eabi-4.8/bin。
這是環境信息。我還沒有安裝NDK或SDK，因爲我看到android 7.1.1的api級別是25，而最新的NDK只支持24，所以我有點困惑。
如果我運行命令：m -j8 uboot linux uboot編譯得很好，但編譯linux內核時出現了很多錯誤。
/media/yangjiel/disk2/android/kernel/arch/arm/mach-omap2/prm_common.c: In function 'omap_prcm_register_chain_handler':
/media/yangjiel/disk2/android/kernel/arch/arm/mach-omap2/prm_common.c:293:2: warning: passing argument 2 of 'irq_set_chained_handler' from incompatible pointer type [enabled by default]
error, forbidden warning: prm_common.c:293
make[2]: *** [arch/arm/mach-omap2/prm_common.o] Error 1
make[1]: *** [arch/arm/mach-omap2] Error 2
make[1]: *** Waiting for unfinished jobs....
/media/yangjiel/disk2/android/kernel/kernel/sysctl_binary.c:141:13: error: 'KERN_BOOT_REASON' undeclared here (not in a function)
{ CTL_INT, KERN_BOOT_REASON, "boot_reason" },
^
/media/yangjiel/disk2/android/kernel/kernel/sysctl_binary.c:528:13: error: 'NET_IPV6_ACCEPT_RA_PREFIX_ROUTE' undeclared here (not in a function)
{ CTL_INT, NET_IPV6_ACCEPT_RA_PREFIX_ROUTE, "accept_ra_prefix_route" },
^
/media/yangjiel/disk2/android/kernel/kernel/sysctl_binary.c:528:2: error: initializer element is not constant
{ CTL_INT, NET_IPV6_ACCEPT_RA_PREFIX_ROUTE, "accept_ra_prefix_route" },
^
/media/yangjiel/disk2/android/kernel/kernel/sysctl_binary.c:528:2: error: (near initialization for 'bin_net_ipv6_conf_var_table[24].ctl_name')
make[2]: *** [kernel/sysctl_binary.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [kernel] Error 2
make: *** [sub-make] Error 2
make: Leaving directory `/media/yangjiel/disk2/android/kernel'
ninja: build stopped: subcommand failed.
make: *** [ninja_wrapper] Error 1
make: Leaving directory `/media/yangjiel/disk2/android'
如果我放棄在該文件中，其導致此錯誤的線，上述錯誤解決，但我會得到另一個
/media/yangjiel/disk2/android/kernel/kernel/cgroup.c: In function 'subsys_cgroup_allow_attach':
/media/yangjiel/disk2/android/kernel/kernel/cgroup.c:2138:37: error: invalid operands to binary != (have 'kuid_t' and 'kuid_t')
if (current != task && cred->euid != tcred->uid &&
^
/media/yangjiel/disk2/android/kernel/kernel/cgroup.c:2139:18: error: invalid operands to binary != (have 'kuid_t' and 'kuid_t')
cred->euid != tcred->suid)
^
make[2]: *** [kernel/cgroup.o] Error 1
make[2]: *** Waiting for unfinished jobs....
CC kernel/trace/power-traces.o
CC kernel/trace/rpm-traces.o
CC kernel/trace/trace_probe.o
LD kernel/trace/libftrace.o
LD kernel/trace/built-in.o
make[1]: *** [kernel] Error 2
make: *** [sub-make] Error 2
make: Leaving directory `/media/yangjiel/disk2/android/kernel'
ninja: build stopped: subcommand failed.
make: *** [ninja_wrapper] Error 1
make: Leaving directory `/media/yangjiel/disk2/android'
有更多的錯誤的後面。
我用google搜索過，大部分人都說這是一個工具鏈問題。但是我沒有找到很多有關如何正確安裝工具鏈的說明，尤其是7.1.1。似乎沒有Android 4.4內核所需的工具鏈。我獲取自定義的Android 4.4內核，它編譯得很好。