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misc/android: document the standalone NDK toolchain #14398

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rakyll opened this issue Feb 19, 2016 · 5 comments
Closed

misc/android: document the standalone NDK toolchain #14398

rakyll opened this issue Feb 19, 2016 · 5 comments
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Documentation FrozenDueToAge
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@rakyll
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rakyll commented Feb 19, 2016

I don't remember having to set the sysroot with arm-linux-androideabi-gcc before.

/cc @crawshaw

$ arm-linux-androideabi-gcc --version
arm-linux-androideabi-gcc (GCC) 4.8
Copyright (C) 2013 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

$ CC_FOR_TARGET=arm-linux-androideabi-gcc CXX_FOR_TARGET=arm-linux-androideabi-gcc  GOARCH=arm GOARM=7 ./androidtest.bash

# ...
##### Building packages and commands for android/amd64.
runtime/internal/sys
runtime/internal/atomic
runtime
errors
internal/race
sync/atomic
unicode
unicode/utf8
math
sort
container/list
container/ring
crypto/subtle
sync
runtime/cgo
encoding
unicode/utf16
image/color
runtime/race
cmd/vet/internal/whitelist
container/heap
io
syscall
internal/singleflight
image/color/palette
hash
crypto/cipher
runtime/trace
# runtime/cgo
runtime/cgo/gcc_android.c:8:10: fatal error: 'android/log.h' file not found
hash/adler32
hash/crc32
crypto/hmac
@hyangah
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hyangah commented Feb 19, 2016

Are you using a stand-alone ndk toolchain?

In builder, we use a stand-alone ndk toolchain prepared with make-standalone-toolchain.sh which sets up all the include files and libraries in usual places. http://developer.android.com/ndk/guides/standalone_toolchain.html

Otherwise, wrap the gcc command with --sysroot and set CC to be the wrapper.

@hyangah
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hyangah commented Feb 19, 2016

I mean CC_FOR_TARGET

@rakyll
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rakyll commented Feb 19, 2016

I will update the docs about building the standalone toolchain.

@rakyll rakyll changed the title misc: androidtest.bash is failing build: androidtest.bash is failing Feb 19, 2016
@rakyll rakyll changed the title build: androidtest.bash is failing misc/android: document standalone toolchain Feb 19, 2016
@rakyll rakyll added this to the Unreleased milestone Feb 19, 2016
@rakyll rakyll changed the title misc/android: document standalone toolchain misc/android: document the standalone NDK toolchain Feb 19, 2016
@dr2chase
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Still needs documentation or self-diagnosis or something. On a Mac, it fails like so:

~/GoogleDrive/work/go/src$ ./androidtest.bash 
GOARCH must be set
~/GoogleDrive/work/go/src$ GOARCH=arm64 ./androidtest.bash 
##### Building Go bootstrap tool.
cmd/dist
...
# runtime/cgo
runtime/cgo/gcc_android.c:6:10: fatal error: 'android/log.h' file not found

and then many repetitions of

warning: unable to find runtime/cgo.a
/Users/drchase/GoogleDrive/work/go/pkg/tool/darwin_amd64/link: running clang failed: exit status 1
ld: unknown option: -z
clang: error: linker command failed with exit code 1 (use -v to see invocation)

I had related unhappiness trying to bootstrap.bash on a Linux box; no problems with linker flags, but could not find runtime/cgo.a.

@eliasnaur
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I believe this is now covered by misc/android/README. In particular, androidtest.bash is now gone and standalone toolchains are no longer required; recent NDKs include toolchains ready to use.

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