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Ruby: suppress -Wdefault-const-init-field-unsafe for clang 21+ #3419

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Merged
kpumuk merged 1 commit into from
Apr 26, 2026
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Ruby: suppress -Wdefault-const-init-field-unsafe for clang 21+ #3419

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7 changes: 7 additions & 0 deletions lib/rb/ext/extconf.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,13 @@

append_cflags(["-fsigned-char", "-g", "-O2", "-Wall", "-Werror", "-Werror=old-style-definition"])

# clang 21+ introduced -Wdefault-const-init-field-unsafe, which fires on
# Ruby 3.2's rstring.h (struct RString has a const field via RBasic).
# This is a Ruby header issue, not a Thrift bug, so suppress the warning here.
# append_cflags silently ignores flags unsupported by the compiler, so this
# is safe across all clang versions.
append_cflags("-Wno-default-const-init-field-unsafe")

# Makes all symbols private by default to avoid unintended conflict
# with other gems. To explicitly export symbols you can use RUBY_FUNC_EXPORTED
# selectively, or entirely remove this flag.
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