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cmd/go: packages that use cgo not cached when cross-compiling android .so file #29132

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bronze1man opened this Issue Dec 7, 2018 · 3 comments

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bronze1man commented Dec 7, 2018

Here is my build command (fast in go1.9.2), I used goroutines and waitgroup to make it build two android cpu arch in two processes to make it faster:

go build -buildmode=c-shared -i -pkgdir /xxx/pkg/android_386_shared -tags "android linux" -ldflags "-s -w" -gcflags=-trimpath=/xxx/ -o=bin/jniLibs/x86/libxxx.so xxx/xxx
go build -buildmode=c-shared -i -pkgdir /xxx/pkg/android_arm_shared -tags "android linux" -ldflags "-s -w" -gcflags=-trimpath=/xxx/ -o=bin/jniLibs/arm/libxxx.so xxx/xxx

My computer os is mac os 10.13.6
My program use cgo and it have a lot of c source code (sqlite3,"github.com/mutecomm/go-sqlcipher")
During all step I will not delete/modify the result .so files.
before first time run in go1.11.2, i will use rm -rf /Users/xxx/Library/Caches/go-build && rm -rf ./pkg && rm -rf ./bin to clean all build cache.
before first time run in go1.9.2, i will use rm -rf ./pkg && rm -rf ./bin to clean all build cache.
after first time run and before second time run, I will not change any code.
after second time run and before third time run, I will change one comment in the main package.

build time with go1.11.2

  • first 1m15.48132439s
  • second 44.123888335s
  • third 46.841824535s

build time with go1.9.2

  • first 1m15.187967573s
  • second 5.208278504s
  • third 3.91962979s

What I have already tried

Looks like I have already did what i can do to make the build faster in the command line without read the actually build source code to find some hidden faster flag.

  • I have tried go install -buildmode=c-shared xxx, it will not faster.
  • I have tried do not pass -pkgdir parameters, it will not faster.
  • I have tried do not pass -i parameters, it will not faster.
  • I have tried add -ldflags "-s -w", it save me about 20s in golang1.11.2, so I add in my program.

My build script to cross build .a file (-buildmode=c-archive) to ios(darwin arm64) have the same problem.
My build script to cross build elf file to (linux,amd64) become faster in go1.11.2 than go1.9.2.
I guess the build cache part of cross build android/ios or (-buildmode=c-archive) or (-buildmode=c-shared) have been delete.
Currently, I have to stop upgrade to newer golang version forever if I want develop my android/ios app faster.

So My problem is What command line should I use, if I want faster corss build to android with go1.11.2?

@ianlancetaylor

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ianlancetaylor commented Dec 7, 2018

Show us the go build -x output.

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bronze1man commented Dec 7, 2018

2018-12-07_13-22-24.log.zip

Here's the log result of the second execution without code changes.

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ianlancetaylor commented Dec 7, 2018

Thanks. Looks like the packages that use cgo have not been cached. I'm not sure why.

@ianlancetaylor ianlancetaylor changed the title android .so file cross build slow without code change after upgrade to go1.11.2 from go1.9.2 cmd/go: android .so file cross build slow without code change after upgrade to go1.11.2 from go1.9.2 Dec 7, 2018

@ianlancetaylor ianlancetaylor added this to the Go1.12 milestone Dec 7, 2018

@bcmills bcmills modified the milestones: Go1.12, Go1.13 Jan 17, 2019

@bcmills bcmills added the ToolSpeed label Jan 17, 2019

@bcmills bcmills changed the title cmd/go: android .so file cross build slow without code change after upgrade to go1.11.2 from go1.9.2 cmd/go: packages that use cgo not cached when cross-compiling android .so file Jan 17, 2019

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