firebase · ncooke3 · Jun 12, 2025 · Jun 12, 2025 · Jun 12, 2025
diff --git a/FirebaseABTesting.podspec b/FirebaseABTesting.podspec
@@ -49,7 +49,6 @@ Firebase Cloud Messaging and Firebase Remote Config in your app.
   s.requires_arc = base_dir + '*.m'
   s.public_header_files = base_dir + 'Public/FirebaseABTesting/*.h'
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
   }
   s.dependency 'FirebaseCore', '~> 11.15.0'

diff --git a/FirebaseAppCheck.podspec b/FirebaseAppCheck.podspec
@@ -51,7 +51,6 @@ Pod::Spec.new do |s|
   s.dependency 'GoogleUtilities/UserDefaults', '~> 8.1'
 
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
   }
 

diff --git a/FirebaseAppDistribution.podspec b/FirebaseAppDistribution.podspec
@@ -36,7 +36,6 @@ iOS SDK for App Distribution for Firebase.
   s.dependency 'FirebaseInstallations', '~> 11.0'
 
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
   }
 

diff --git a/FirebaseAuth.podspec b/FirebaseAuth.podspec
@@ -49,7 +49,6 @@ supports email and password accounts, as well as several 3rd party authenticatio
     'FirebaseAuth/CHANGELOG.md'
   ]
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     # The second path is to find FirebaseAuth-Swift.h from a pod gen project
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}" "${OBJECT_FILE_DIR_normal}/${NATIVE_ARCH_ACTUAL}"',
     'OTHER_SWIFT_FLAGS' => "$(inherited) #{ENV.key?('FIREBASE_CI') ? '-D FIREBASE_CI -warnings-as-errors' : ''}"

diff --git a/FirebaseCore.podspec b/FirebaseCore.podspec
@@ -56,7 +56,6 @@ Firebase Core includes FIRApp and FIROptions which provide central configuration
   s.dependency 'FirebaseCoreInternal', '~> 11.15.0'
 
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' => 'Firebase_VERSION=' + s.version.to_s,
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"',
     'OTHER_CFLAGS' => '-fno-autolink'

diff --git a/FirebaseCore/CHANGELOG.md b/FirebaseCore/CHANGELOG.md
@@ -1,3 +1,6 @@
+# Unreleased
+- [fixed] Remove c99 as the required C language standard. (#14950)
+
 # Firebase 11.12.0
 - [changed] Firebase now requires at least Xcode 16.2. See
   https://developer.apple.com/news/?id=9s0rgdy9 for more info.

diff --git a/FirebaseCrashlytics.podspec b/FirebaseCrashlytics.podspec
@@ -75,7 +75,6 @@ Pod::Spec.new do |s|
   s.watchos.frameworks = 'Security'
 
   s.ios.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
       'CLS_SDK_NAME="Crashlytics iOS SDK" ' +
       # For nanopb:
@@ -84,7 +83,6 @@ Pod::Spec.new do |s|
   }
 
   s.osx.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
       'CLS_SDK_NAME="Crashlytics Mac SDK" ' +
       # For nanopb:
@@ -93,7 +91,6 @@ Pod::Spec.new do |s|
   }
 
   s.tvos.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
       'CLS_SDK_NAME="Crashlytics tvOS SDK" ' +
       # For nanopb:
@@ -102,7 +99,6 @@ Pod::Spec.new do |s|
   }
 
   s.watchos.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
       'CLS_SDK_NAME="Crashlytics watchOS SDK" ' +
       # For nanopb:

diff --git a/FirebaseDatabase.podspec b/FirebaseDatabase.podspec
@@ -53,7 +53,6 @@ Simplify your iOS development, grow your user base, and monetize more effectivel
   s.dependency 'FirebaseSharedSwift', '~> 11.0'
   s.dependency 'GoogleUtilities/UserDefaults', '~> 8.1'
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
   }
 

diff --git a/FirebaseDynamicLinks.podspec b/FirebaseDynamicLinks.podspec
@@ -40,7 +40,6 @@ Firebase Dynamic Links are deep links that enhance user experience and increase
   s.dependency 'FirebaseCore', '~> 11.15.0'
 
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' => 'FIRDynamicLinks3P GIN_SCION_LOGGING',
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
   }

diff --git a/FirebaseFirestoreInternal.podspec b/FirebaseFirestoreInternal.podspec
@@ -118,7 +118,6 @@ Google Cloud Firestore is a NoSQL document database built for automatic scaling,
   s.pod_target_xcconfig = {
     'CLANG_CXX_LANGUAGE_STANDARD' => 'c++14',
     'CLANG_CXX_LIBRARY' => 'libc++',
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
       "FIRFirestore_VERSION=#{s.version} " +
       # The nanopb pod sets these defs, so we must too. (We *do* require 16bit

diff --git a/FirebaseFirestoreTestingSupport.podspec b/FirebaseFirestoreTestingSupport.podspec
@@ -45,7 +45,6 @@ Pod::Spec.new do |s|
   s.dependency 'FirebaseFirestore', '~> 11.0'
 
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'OTHER_CFLAGS' => '-fno-autolink',
     'HEADER_SEARCH_PATHS' =>
       '"${PODS_TARGET_SRCROOT}" '

diff --git a/FirebaseInstallations.podspec b/FirebaseInstallations.podspec
@@ -52,7 +52,6 @@ Pod::Spec.new do |s|
 
   preprocessor_definitions = ''
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' => preprocessor_definitions,
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
   }

diff --git a/FirebaseMLModelDownloader.podspec b/FirebaseMLModelDownloader.podspec
@@ -44,7 +44,6 @@ Pod::Spec.new do |s|
   s.dependency 'SwiftProtobuf', '~> 1.19'
 
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' => 'FIRMLModelDownloader_VERSION=' + s.version.to_s,
     'OTHER_CFLAGS' => '-fno-autolink',
   }

diff --git a/FirebaseMessaging.podspec b/FirebaseMessaging.podspec
@@ -50,7 +50,6 @@ device, and it is completely free.
   }
   s.library = 'sqlite3'
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
       # for nanopb:
       'PB_FIELD_32BIT=1 PB_NO_PACKED_STRUCTS=1 PB_ENABLE_MALLOC=1',

diff --git a/FirebasePerformance.podspec b/FirebasePerformance.podspec
@@ -50,7 +50,6 @@ Firebase Performance library to measure performance of Mobile and Web Apps.
   end
 
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'GCC_PREPROCESSOR_DEFINITIONS' => preprocessor_definitions,
     # Unit tests do library imports using repo-root relative paths.
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"',

diff --git a/FirebaseRemoteConfig.podspec b/FirebaseRemoteConfig.podspec
@@ -47,7 +47,6 @@ app update.
     "#{s.module_name}_Privacy" => 'FirebaseRemoteConfig/Swift/Resources/PrivacyInfo.xcprivacy'
   }
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
   }
   s.dependency 'FirebaseABTesting', '~> 11.0'

diff --git a/FirebaseSessions.podspec b/FirebaseSessions.podspec
@@ -49,7 +49,6 @@ Pod::Spec.new do |s|
   s.dependency 'PromisesSwift', '~> 2.1'
 
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"',
     'GCC_PREPROCESSOR_DEFINITIONS' =>
       # For nanopb:

diff --git a/Package.swift b/Package.swift
@@ -1430,7 +1430,6 @@ let package = Package(
       ]
     ),
   ] + firestoreTargets(),
-  cLanguageStandard: .c99,
   cxxLanguageStandard: CXXLanguageStandard.gnucxx14
 )
-Original file line number
+Diff line change
@@ Expand Up / @@ -1430,7 +1430,6 @@ let package = Package( @@
           ]
         ),
       ] + firestoreTargets(),
-      cLanguageStandard: .c99,
       cxxLanguageStandard: CXXLanguageStandard.gnucxx14
     )
@@ Expand Down @@