internal/build:support relocatable lib

[luoliwoshang]

fixed #1135

• LLGO_FULL_RPATH to controll every comile process's lib path set to RPATH
• test at [wip] llgo:prerelease-testing with libwind-19-dev & libc++-19-dev Homebrew/homebrew-core#227010

reason

library with conan with generate install_name directly with @rpath and the go is not add rpath for these dylib.

llgo/d on  internal/build/rpath [$!?] via C v17.0.0-clang 
❯ otool -D /opt/homebrew/Cellar/cjson/1.7.18/lib/libcjson_utils.dylib
/opt/homebrew/Cellar/cjson/1.7.18/lib/libcjson_utils.dylib:
/opt/homebrew/opt/cjson/lib/libcjson_utils.1.dylib
(base) 
llgo/d on  internal/build/rpath [$!?] via C v17.0.0-clang 
❯ otool -D /Users/zhangzhiyang/.conan2/p/b/cjsond2bd82ff69524/p/lib/libcjson_utils.dylib 
/Users/zhangzhiyang/.conan2/p/b/cjsond2bd82ff69524/p/lib/libcjson_utils.dylib:
@rpath/libcjson_utils.1.dylib

resolution

Treat every link-time library search path, specified by the -L parameter, as a runtime search path as well.This is to ensure the final executable can locate libraries with a relocatable install_name (e.g., "@rpath/libfoo.dylib") at runtime.

current run normally

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.01%. Comparing base (cbac24c) to head (1d76f51).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1163   +/-   ##
=======================================
  Coverage   88.01%   88.01%           
=======================================
  Files          34       34           
  Lines        8374     8374           
=======================================
  Hits         7370     7370           
  Misses        935      935           
  Partials       69       69           

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[luoliwoshang]

@cpunion need review

[cpunion]

Add a cjson example in _demo/ to compare different results with the switch.

[cpunion]

Make all homebrew tests pass to trigger prebuilt binaries tests

[luoliwoshang]

Add a cjson example in _demo/ to compare different results with the switch.

Current testing requires a real environment since llgo uses cjson dylib with @rpath install name, but storing dynamic libraries in the repo is clearly not ideal. We could directly use the precompiled libraries from llpkg/cjsonv1.0.0 release for testing https://github.com/goplus/llpkg/releases/tag/cjson%2Fv1.0.0 , which avoids installing conan in test environments and saves the time overhead of downloading dependencies through conan.

this release is prefix with @rpath which is current pr need support

cjson_darwin_arm64/lib
❯ otool -D ./libcjson.dylib
./libcjson.dylib:
@rpath/libcjson.1.dylib

[luoliwoshang]

Make all homebrew tests pass to trigger prebuilt binaries tests

I Just merge the main code,and squash my homebrew test'commit to pass commit style check, with the new check process llgo build fail https://github.com/Homebrew/homebrew-core/actions/runs/17058628559/job/48361297264?pr=227010 ,because the go1.25 is released.
And this pr actuall success at go1.24 Homebrew/homebrew-core#234046
the reason is go1.25 release ,check at this pr Homebrew/homebrew-core#234045

[cpunion]

I Just merge the main code,and squash my homebrew test'commit to pass commit style check, with the new check process llgo build fail https://github.com/Homebrew/homebrew-core/actions/runs/17058628559/job/48361297264?pr=227010 ,because the go1.25 is released. And this pr actuall success at go1.24 Homebrew/homebrew-core#234046 the reason is go1.25 release ,check at this pr Homebrew/homebrew-core#234045

Maybe lock go to go@1.24 in llgo.rb

[luoliwoshang]

okay, i will upload a llgo.rb update

[luoliwoshang]

Maybe lock go to go@1.24 in llgo.rb

llgo at homebrew current locked at depend go1.24 Homebrew/homebrew-core#234050

Add a cjson example in _demo/ to compare different results with the switch.

And have test the cargs lib to compare different results with the switch. (cjson current is install at brew&apt),so choose other lib

[luoliwoshang]

And the homebrew test after lock go1.24 ,with this pr update ,is pass correctly Homebrew/homebrew-core#227010