(arrow) branch main updated: GH-41396: [Ruby] Add workaround for re2.pc on Ubuntu 20.04 (#43721)

[kou]

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The following commit(s) were added to refs/heads/main by this push:
     new e9767c1a26 GH-41396: [Ruby] Add workaround for re2.pc on Ubuntu 20.04 
(#43721)
e9767c1a26 is described below

commit e9767c1a268f543536077cf80f49b097739f308c
Author: Sutou Kouhei <k...@clear-code.com>
AuthorDate: Fri Aug 16 11:43:32 2024 +0900

    GH-41396: [Ruby] Add workaround for re2.pc on Ubuntu 20.04 (#43721)
    
    ### Rationale for this change
    
    Old re2.pc add "-std=c++11" but it causes a build error. Because Apache 
Arrow C++ requires C++17.
    
    ### What changes are included in this PR?
    
    Remove "-std=c++11" as workaround. We can remove this workaround when we 
drop support for Ubuntu 20.04.
    
    ### Are these changes tested?
    
    Yes.
    
    ### Are there any user-facing changes?
    
    Yes.
    * GitHub Issue: #41396
    
    Authored-by: Sutou Kouhei <k...@clear-code.com>
    Signed-off-by: Sutou Kouhei <k...@clear-code.com>
---
 ruby/red-arrow/ext/arrow/extconf.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ruby/red-arrow/ext/arrow/extconf.rb 
b/ruby/red-arrow/ext/arrow/extconf.rb
index 7ef3c6c834..28ccd0b2d5 100644
--- a/ruby/red-arrow/ext/arrow/extconf.rb
+++ b/ruby/red-arrow/ext/arrow/extconf.rb
@@ -66,6 +66,13 @@ unless required_pkg_config_package([
   exit(false)
 end
 
+# Old re2.pc (e.g. re2.pc on Ubuntu 20.04) may add -std=c++11. It
+# causes a build error because Apache Arrow C++ requires C++17 or
+# later.
+#
+# We can remove this when we drop support for Ubuntu 20.04.
+$CXXFLAGS.gsub!("-std=c++11", "")
+
 [
   ["glib2", "ext/glib2"],
 ].each do |name, relative_source_dir|