Files
notesnook/apps/mobile/ios/scripts/patch_fmt_consteval.rb
2026-08-04 12:11:54 +05:00

78 lines
2.9 KiB
Ruby

# Xcode >= 26.2 rejects fmt's compile-time format-string check with
#
# call to consteval function 'fmt::fstring<...>::fstring<char[N]>' is not a
# constant expression
#
# React Native 0.81/0.82 vendor fmt 11.0.2, which hits this. It is an upstream
# incompatibility (reproducible in a stock RN app), but left alone it makes those
# RN versions permanently un-buildable on a modern Xcode.
#
# fmt's own escape hatch is FMT_USE_CONSTEVAL: 0 downgrades the format-string
# check from compile-time to run-time. fmt 11.0.2 does not guard its detection
# block with #ifndef, so we cannot simply predefine the macro -- and doing it
# through the build settings is worse anyway:
#
# * a command-line GCC_PREPROCESSOR_DEFINITIONS outranks every per-target
# value, silently dropping COCOAPODS=1, RCT_METRO_PORT, ...
# * a second `post_install` block in the Podfile REPLACES React Native's own.
#
# So we patch the header itself, right after fmt has made up its mind and before
# the first use of the macro. Idempotent, and safe to run on every pod install.
module PatchFmtConsteval
MARKER = 'NOTESNOOK_FMT_CONSTEVAL_PATCH'.freeze
# The line that first consumes the macro; our override goes immediately above
# it, i.e. after the whole detection cascade.
ANCHOR = "#if FMT_USE_CONSTEVAL\n".freeze
OVERRIDE = <<~PATCH.freeze
// #{MARKER}: Xcode >= 26.2 rejects fmt's consteval format-string check
// (see ios/scripts/patch_fmt_consteval.rb). Applied automatically by
// `pod install`; downgrades the check to run-time.
#undef FMT_USE_CONSTEVAL
#define FMT_USE_CONSTEVAL 0
PATCH
# pods_root: the Pods directory (installer.sandbox.root).
def self.apply!(pods_root)
header = File.join(pods_root.to_s, 'fmt', 'include', 'fmt', 'base.h')
unless File.exist?(header)
Pod::UI.warn "fmt: #{header} not found, skipping consteval patch."
return
end
contents = File.read(header)
if contents.include?(MARKER)
Pod::UI.puts 'fmt: consteval patch already applied.'
return
end
index = contents.index(ANCHOR)
if index.nil?
Pod::UI.warn 'fmt: could not find `#if FMT_USE_CONSTEVAL` in base.h; ' \
'the consteval patch was NOT applied. If this fmt version ' \
'still uses a consteval format-string check, builds on ' \
'Xcode >= 26.2 will fail -- update ' \
'ios/scripts/patch_fmt_consteval.rb.'
return
end
contents.insert(index, OVERRIDE)
# CocoaPods checks pod sources out read-only (0444), so make the header
# writable for the write and restore the original mode afterwards.
mode = File.stat(header).mode & 0o7777
begin
File.chmod(mode | 0o200, header)
File.write(header, contents)
ensure
File.chmod(mode, header)
end
Pod::UI.puts 'fmt: patched base.h to set FMT_USE_CONSTEVAL=0 (Xcode >= 26.2 compatibility).'
end
end