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fix(ios): build fmt pod as C++17 to fix Xcode 26.4+ consteval error #306

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fix(ios): build fmt pod as C++17 to fix Xcode 26.4+ consteval error #306

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15 changes: 15 additions & 0 deletions example/ios/Podfile
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Original file line number Diff line number Diff line change
Expand Up @@ -33,5 +33,20 @@ target 'RiveExample' do
:mac_catalyst_enabled => false,
# :ccache_enabled => true
)

# fmt `consteval` build error on Xcode 26.4+ (Apple clang 21): fmt's compile-time
# FMT_STRING (basic_format_string's consteval ctor) is rejected as a non-constant
# expression. Compile only the `fmt` pod as C++17 so fmt's own base.h disables consteval:
# with FMT_CPLUSPLUS < 201709 it hits `#define FMT_USE_CONSTEVAL 0` before the
# `__cpp_consteval` branch. NOTE: a plain `-DFMT_USE_CONSTEVAL=0` define does NOT work —
# base.h re-#defines FMT_USE_CONSTEVAL unconditionally (it is not #ifndef-guarded), so it
# overrides any command-line define. Verified on Xcode 26.6. Real fix is upstream in
# React Native 0.83+ (fmtlib/fmt#4740, facebook/react-native#55601); remove once we bump.
installer.pods_project.targets.each do |target|
next unless target.name == 'fmt'
target.build_configurations.each do |bc|
bc.build_settings['CLANG_CXX_LANGUAGE_STANDARD'] = 'c++17'
end
end
end
end
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