From 464ce0bb212364d4b75285b3b2a44597e0e4c04e Mon Sep 17 00:00:00 2001
From: "google-labs-jules[bot]"
 <161369871+google-labs-jules[bot]@users.noreply.github.com>
Date: Thu, 12 Jun 2025 17:20:43 +0000
Subject: [PATCH 1/2] Here's the updated commit message:

Remove C99 language standard settings

This commit removes the explicit C99 language standard setting (`'GCC_C_LANGUAGE_STANDARD' => 'c99',` and `cLanguageStandard: .c99,`) from all relevant podspec files and the `Package.swift` file.

This change is made to rely on default compiler settings or settings defined elsewhere, promoting consistency and reducing redundancy.
---
 FirebaseABTesting.podspec               | 1 -
 FirebaseAppCheck.podspec                | 1 -
 FirebaseAppDistribution.podspec         | 1 -
 FirebaseAuth.podspec                    | 1 -
 FirebaseCore.podspec                    | 1 -
 FirebaseCrashlytics.podspec             | 4 ----
 FirebaseDatabase.podspec                | 1 -
 FirebaseDynamicLinks.podspec            | 1 -
 FirebaseFirestoreInternal.podspec       | 1 -
 FirebaseFirestoreTestingSupport.podspec | 1 -
 FirebaseInstallations.podspec           | 1 -
 FirebaseMLModelDownloader.podspec       | 1 -
 FirebaseMessaging.podspec               | 1 -
 FirebasePerformance.podspec             | 1 -
 FirebaseRemoteConfig.podspec            | 1 -
 FirebaseSessions.podspec                | 1 -
 Package.swift                           | 1 -
 17 files changed, 20 deletions(-)

diff --git a/FirebaseABTesting.podspec b/FirebaseABTesting.podspec
index 5750efc2fbc..82ec4457133 100644
--- 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
index a12e8bd7d99..417e5d63576 100644
--- 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
index 700028f9a4a..42214d76505 100644
--- 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
index e11eaf47c0e..5ca2eb61f2a 100644
--- 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
index 63a0a5b27fa..12180f591b8 100644
--- 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/FirebaseCrashlytics.podspec b/FirebaseCrashlytics.podspec
index 6955088b69e..3ebb6837ffa 100644
--- 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
index 128a19ba904..09768d48252 100644
--- 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
index 13d0a340d4d..5ad9a08caa3 100644
--- 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
index 0f71bd8dbe0..ef81b8da45b 100644
--- 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
index a28ab450c3f..97ab0f834a6 100644
--- 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
index 0adffd04b85..45c40ca732d 100644
--- 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
index 004a74143be..2590eead306 100644
--- 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
index 9e66e74b205..8cf729a8fca 100644
--- 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
index a95ad9fbd2f..d2124aa25c3 100644
--- 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' => '"${PODS_TARGET_SRCROOT}"',
diff --git a/FirebaseRemoteConfig.podspec b/FirebaseRemoteConfig.podspec
index 3d90a14b950..ea7760ffc21 100644
--- a/FirebaseRemoteConfig.podspec
+++ b/FirebaseRemoteConfig.podspec
@@ -47,7 +47,6 @@ app update.
     "#{s.module_name}_Privacy" => 'FirebaseRemoteConfig/Swift/Resources/PrivacyInfo.xcprivacy'
   }
   s.pod_target_xcconfig = {
-    'GCC_C_LANGUAGE_STANDARD' => 'c99',
     'HEADER_SEARCH_PATHS' => '"${PODS_TARGET_SRCROOT}"'
   }
   s.dependency 'FirebaseABTesting', '~> 11.0'
diff --git a/FirebaseSessions.podspec b/FirebaseSessions.podspec
index 8c92c6b6172..9bb2e6988da 100644
--- 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
index 1a46f5a94ab..f82fa0e8222 100644
--- a/Package.swift
+++ b/Package.swift
@@ -1430,7 +1430,6 @@ let package = Package(
       ]
     ),
   ] + firestoreTargets(),
-  cLanguageStandard: .c99,
   cxxLanguageStandard: CXXLanguageStandard.gnucxx14
 )
 

From ab62ff995b0758f89ffa225dc7313175a94e90b5 Mon Sep 17 00:00:00 2001
From: Nick Cooke <nickcooke@google.com>
Date: Thu, 12 Jun 2025 16:12:17 -0400
Subject: [PATCH 2/2] [skip ci] add changelog entry

---
 FirebaseCore/CHANGELOG.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/FirebaseCore/CHANGELOG.md b/FirebaseCore/CHANGELOG.md
index 03fd4f701a4..33bf5733e7b 100644
--- 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.