[Infra] Remove C99 language standard settings (#14970)

ncooke3 · google-labs-jules[bot] · web-flow · commit 5902b4087de3 · 2025-06-12T16:13:06.000-04:00
Co-authored-by: google-labs-jules[bot] &lt;161369871+google-labs-jules[bot]@users.noreply.github.com&gt;
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 number	Diff line change
`@@ -49,7 +49,6 @@ Firebase Cloud Messaging and Firebase Remote Config in your app.`
`49`	`49`	`s.requires_arc = base_dir + '*.m'`
`50`	`50`	`s.public_header_files = base_dir + 'Public/FirebaseABTesting/*.h'`
`51`	`51`	`s.pod_target_xcconfig = {`
`52`		`- 'GCC_C_LANGUAGE_STANDARD' => 'c99',`
`53`	`52`	`'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'`
`54`	`53`	`}`
`55`	`54`	`s.dependency 'FirebaseCore', '~> 11.15.0'`
Original file line number	Diff line number	Diff line change
`@@ -51,7 +51,6 @@ Pod::Spec.new do \|s\|`
`51`	`51`	`s.dependency 'GoogleUtilities/UserDefaults', '~> 8.1'`
`52`	`52`
`53`	`53`	`s.pod_target_xcconfig = {`
`54`		`- 'GCC_C_LANGUAGE_STANDARD' => 'c99',`
`55`	`54`	`'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'`
`56`	`55`	`}`
`57`	`56`
Original file line number	Diff line number	Diff line change
`@@ -36,7 +36,6 @@ iOS SDK for App Distribution for Firebase.`
`36`	`36`	`s.dependency 'FirebaseInstallations', '~> 11.0'`
`37`	`37`
`38`	`38`	`s.pod_target_xcconfig = {`
`39`		`- 'GCC_C_LANGUAGE_STANDARD' => 'c99',`
`40`	`39`	`'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'`
`41`	`40`	`}`
`42`	`41`
Original file line number	Diff line number	Diff line change
`@@ -49,7 +49,6 @@ supports email and password accounts, as well as several 3rd party authenticatio`
`49`	`49`	`'FirebaseAuth/CHANGELOG.md'`
`50`	`50`	`]`
`51`	`51`	`s.pod_target_xcconfig = {`
`52`		`- 'GCC_C_LANGUAGE_STANDARD' => 'c99',`
`53`	`52`	`# The second path is to find FirebaseAuth-Swift.h from a pod gen project`
`54`	`53`	`'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}" "${OBJECT_FILE_DIR_normal}/${NATIVE_ARCH_ACTUAL}"',`
`55`	`54`	`'OTHER_SWIFT_FLAGS' => "$(inherited) #{ENV.key?('FIREBASE_CI') ? '-D FIREBASE_CI -warnings-as-errors' : ''}"`
Original file line number	Diff line number	Diff line change
`@@ -53,7 +53,6 @@ Simplify your iOS development, grow your user base, and monetize more effectivel`
`53`	`53`	`s.dependency 'FirebaseSharedSwift', '~> 11.0'`
`54`	`54`	`s.dependency 'GoogleUtilities/UserDefaults', '~> 8.1'`
`55`	`55`	`s.pod_target_xcconfig = {`
`56`		`- 'GCC_C_LANGUAGE_STANDARD' => 'c99',`
`57`	`56`	`'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'`
`58`	`57`	`}`
`59`	`58`
Original file line number	Diff line number	Diff line change
`@@ -40,7 +40,6 @@ Firebase Dynamic Links are deep links that enhance user experience and increase`
`40`	`40`	`s.dependency 'FirebaseCore', '~> 11.15.0'`
`41`	`41`
`42`	`42`	`s.pod_target_xcconfig = {`
`43`		`- 'GCC_C_LANGUAGE_STANDARD' => 'c99',`
`44`	`43`	`'GCC_PREPROCESSOR_DEFINITIONS' => 'FIRDynamicLinks3P GIN_SCION_LOGGING',`
`45`	`44`	`'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'`
`46`	`45`	`}`