I need to compile my program - main.go with package bigPak without source. Exist only bigPak.a tnto GOPATH/pkg.
Can you give me example of compile main.go with bigPak.a ?
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It might be possible, but if it is you'd have to manually invoke the linker and compiler, it would be pretty hard to work with.Linear– Linear2014-10-23 08:18:57 +00:00Commented Oct 23, 2014 at 8:18
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Related question: stackoverflow.com/questions/28406122Sergey Vyacheslavovich Brunov– Sergey Vyacheslavovich Brunov2015-12-22 13:53:34 +00:00Commented Dec 22, 2015 at 13:53
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1 Answer
That's dead simple: Just produce a fake bigPak package in the right $GOPATH/src location (an empty package bigPak will do) and (important!!) make sure this synthetic source has a modification time before the modification time of bigPak.a. The go tool should just work like this.
Go is designed to be able to compile from the .a files without transitively reading their includes. The Go tool uses the source (only) to check if an .a files needs to be recompiled (because the source is newer.
9 Comments
Volker
I tried it locally and it did work. Make sure the .a stems from the right compiler version and the paths are ok. (And: showing error messages and detailed setup would make debugging easier.)
user2614682
Maybe I did not understand you... I have bigPak.a what should I do so that my program main.go compile? Please give me an example that would be great!
Volker
Assuming bigPak.a is the object file of package some/big/code and your main program does
import "some/big/code" and is located in $GOPATH/src/me/myprog. You are on 64bit linux and bigPak.a has been compiled for this platform by the Go compiler (not C code!) and declares itself as package sbc. tbc...Volker
You forgot to
touch the fake source. What you did makes the go tool think it has to recompile src/book/bigPak/bigPak.go which it does and then getData is missing.
kostix
@user2614682, no there's no simpler way yet.
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