[ruby-core:124855] [Ruby Bug#21920] LIBRUBYARG_SHARED contains -lgmp and other libraries for static linking

[ruby-core:124855] [Ruby Bug#21920] LIBRUBYARG_SHARED contains -lgmp and other libraries for static linking

[larskanis (Lars Kanis) via ruby-core]

Issue #21920 has been reported by larskanis (Lars Kanis).

----------------------------------------
Bug #21920: LIBRUBYARG_SHARED contains -lgmp and other libraries for static linking
https://bugs.ruby-lang.org/issues/21920

* Author: larskanis (Lars Kanis)
* Status: Open
* ruby -v: ruby 4.1.0dev (2026-02-21 master e730ac41be) +PRISM [aarch64-mingw-ucrt]
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN
----------------------------------------
That recent commit introduced `MAINLIBS` into `LIBRUBYARG_SHARED`: https://github.com/ruby/ruby/commit/d256629bf9e194838d1837be74dcc0b8ff0bcfd6

Before that commit:
```
  CONFIG["LIBRUBYARG_SHARED"] = "-l$(RUBY_SO_NAME)"
  CONFIG["LIBRUBYARG_STATIC"] = "-l$(RUBY_SO_NAME)-static $(MAINLIBS)"

  RbConfig::CONFIG["LIBRUBYARG_SHARED"] # => "-laarch64-ucrt-ruby410"
```

After that commit:
```
  CONFIG["LIBRUBYARG_SHARED"] = "-l$(RUBY_SO_NAME) $(MAINLIBS)"
  CONFIG["LIBRUBYARG_STATIC"] = "-l$(RUBY_SO_NAME)-static $(MAINLIBS)"

  RbConfig::CONFIG["LIBRUBYARG_SHARED"] # => "-laarch64-ucrt-ruby410 -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi -lbcrypt"
```

To my understanding `MAINLIBS` are only for static linking and these libraries are not necessary for shared linking.

This breaks RubyInstaller for Windows, since all C extensions are linked with `LIBRUBYARG_SHARED` and the RubyInstaller distribution ships `libgmp-10.dll` only but not related the `libgmp.a` file. The same happens on x86_64. It is probably an issue on other operating systems as well.

A CI failure log is here: https://github.com/oneclick/rubyinstaller2/actions/runs/22238372563/job/64335608163#step:36:32




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[ruby-core:124859] [Ruby Bug#21920] LIBRUBYARG_SHARED contains -lgmp and other libraries for static linking

[byroot (Jean Boussier) via ruby-core]

Issue #21920 has been updated by byroot (Jean Boussier).

Status changed from Open to Closed
Backport changed from 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN, 4.0: UNKNOWN to 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONTNEED, 4.0: DONTNEED

The commit was reverted https://github.com/ruby/ruby/pull/16212, it should be fixed now.

----------------------------------------
Bug #21920: LIBRUBYARG_SHARED contains -lgmp and other libraries for static linking
https://bugs.ruby-lang.org/issues/21920#change-116513

* Author: larskanis (Lars Kanis)
* Status: Closed
* ruby -v: ruby 4.1.0dev (2026-02-21 master e730ac41be) +PRISM [aarch64-mingw-ucrt]
* Backport: 3.2: DONTNEED, 3.3: DONTNEED, 3.4: DONTNEED, 4.0: DONTNEED
----------------------------------------
That recent commit introduced `MAINLIBS` into `LIBRUBYARG_SHARED`: https://github.com/ruby/ruby/commit/d256629bf9e194838d1837be74dcc0b8ff0bcfd6

Before that commit:
```
  CONFIG["LIBRUBYARG_SHARED"] = "-l$(RUBY_SO_NAME)"
  CONFIG["LIBRUBYARG_STATIC"] = "-l$(RUBY_SO_NAME)-static $(MAINLIBS)"

  RbConfig::CONFIG["LIBRUBYARG_SHARED"] # => "-laarch64-ucrt-ruby410"
```

After that commit:
```
  CONFIG["LIBRUBYARG_SHARED"] = "-l$(RUBY_SO_NAME) $(MAINLIBS)"
  CONFIG["LIBRUBYARG_STATIC"] = "-l$(RUBY_SO_NAME)-static $(MAINLIBS)"

  RbConfig::CONFIG["LIBRUBYARG_SHARED"] # => "-laarch64-ucrt-ruby410 -lgmp -lshell32 -lws2_32 -liphlpapi -limagehlp -lshlwapi -lbcrypt"
```

To my understanding `MAINLIBS` are only for static linking and these libraries are not necessary for shared linking.

This breaks RubyInstaller for Windows, since all C extensions are linked with `LIBRUBYARG_SHARED` and the RubyInstaller distribution ships `libgmp-10.dll` only but not related the `libgmp.a` file. The same happens on x86_64. It is probably an issue on other operating systems as well.

A CI failure log is here: https://github.com/oneclick/rubyinstaller2/actions/runs/22238372563/job/64335608163#step:36:32




-- 
https://bugs.ruby-lang.org/
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 To unsubscribe send an email to ruby-core-leave@ml.ruby-lang.org
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