Enable pedantic warnings in C++ podspecs (facebook#34404)

Summary:
Pull Request resolved: facebook#34404

Mirrors D38457812 (facebook@063c2b4) and D38632454 (facebook@06b55a3), this enables pedantic warnings for iOS in OSS, so that the warning level matches the internal.

This is enabled through the `GCC_WARN_PEDANTIC` xcconfig flag (part of "Apple Clang - Warning Policies"), which controls whether "-pedantic" is passed to clang.

Changelog:
[iOS][Changed] - Enable pedantic warnings in C++ podspecs

Reviewed By: cipolleschi

Differential Revision: D38681644

fbshipit-source-id: 724160fbe03660fcfd12ea0ffeedaab448c66a5f

Author: NickGerleman

ReactCommon/React-Fabric.podspec

@@ -16,7 +16,7 @@ else
   source[:tag] = "v#{version}"
 end
 
-folly_compiler_flags = '-DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1 -Wno-comma -Wno-shorten-64-to-32'
+folly_compiler_flags = '-DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1 -Wno-comma -Wno-shorten-64-to-32 -Wno-gnu-zero-variadic-macro-arguments'
 folly_version = '2021.07.22.00'
 folly_dep_name = 'RCT-Folly/Fabric'
 boost_compiler_flags = '-Wno-documentation'
@@ -315,7 +315,8 @@ Pod::Spec.new do |s|
     ss.source_files         = "react/renderer/leakchecker/**/*.{cpp,h}"
     ss.exclude_files        = "react/renderer/leakchecker/tests"
     ss.header_dir           = "react/renderer/leakchecker"
-    ss.pod_target_xcconfig  = { "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_ROOT)/RCT-Folly\"" }
+    ss.pod_target_xcconfig  = { "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_ROOT)/RCT-Folly\"",
+                                "GCC_WARN_PEDANTIC" => "YES" }
   end
 
   s.subspec "runtimescheduler" do |ss|
@@ -324,13 +325,14 @@ Pod::Spec.new do |s|
     ss.source_files         = "react/renderer/runtimescheduler/**/*.{cpp,h}"
     ss.exclude_files        = "react/renderer/runtimescheduler/tests"
     ss.header_dir           = "react/renderer/runtimescheduler"
-    ss.pod_target_xcconfig  = { "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_ROOT)/RCT-Folly\"" }
+    ss.pod_target_xcconfig  = {"HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_ROOT)/RCT-Folly\"",
+                               "GCC_WARN_PEDANTIC" => "YES" }
   end
 
   s.subspec "utils" do |ss|
     ss.source_files         = "react/utils/*.{m,mm,cpp,h}"
     ss.header_dir           = "react/utils"
-    ss.pod_target_xcconfig  = { "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_ROOT)/RCT-Folly\"" }
+    ss.pod_target_xcconfig  = { "HEADER_SEARCH_PATHS" => "\"$(PODS_TARGET_SRCROOT)/ReactCommon\" \"$(PODS_ROOT)/RCT-Folly\""}
   end
 
 end

ReactCommon/React-bridging.podspec

@@ -16,7 +16,7 @@ else
   source[:tag] = "v#{version}"
 end
 
-folly_compiler_flags = '-DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1 -Wno-comma -Wno-shorten-64-to-32'
+folly_compiler_flags = '-DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1 -Wno-comma -Wno-shorten-64-to-32 -Wno-gnu-zero-variadic-macro-arguments'
 folly_version = '2021.07.22.00'
 
 Pod::Spec.new do |s|
@@ -35,7 +35,8 @@ Pod::Spec.new do |s|
   s.compiler_flags         = folly_compiler_flags
   s.pod_target_xcconfig    = { "HEADER_SEARCH_PATHS" => "\"$(PODS_ROOT)/RCT-Folly\"",
                                "USE_HEADERMAP" => "YES",
-                               "CLANG_CXX_LANGUAGE_STANDARD" => "c++17" }
+                               "CLANG_CXX_LANGUAGE_STANDARD" => "c++17",
+                               "GCC_WARN_PEDANTIC" => "YES" }
 
   s.dependency "RCT-Folly", folly_version
   s.dependency "React-jsi", version

ReactCommon/ReactCommon.podspec

@@ -16,7 +16,7 @@ else
   source[:tag] = "v#{version}"
 end
 
-folly_compiler_flags = '-DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1 -Wno-comma -Wno-shorten-64-to-32'
+folly_compiler_flags = '-DFOLLY_NO_CONFIG -DFOLLY_MOBILE=1 -DFOLLY_USE_LIBCPP=1 -Wno-comma -Wno-shorten-64-to-32 -Wno-gnu-zero-variadic-macro-arguments'
 folly_version = '2021.07.22.00'
 boost_compiler_flags = '-Wno-documentation'
 
@@ -34,7 +34,8 @@ Pod::Spec.new do |s|
   s.compiler_flags         = folly_compiler_flags + ' ' + boost_compiler_flags
   s.pod_target_xcconfig    = { "HEADER_SEARCH_PATHS" => "\"$(PODS_ROOT)/boost\" \"$(PODS_ROOT)/RCT-Folly\" \"$(PODS_ROOT)/DoubleConversion\" \"$(PODS_ROOT)/Headers/Private/React-Core\" \"$(PODS_ROOT)/Headers/Private/React-bridging/react/bridging\" \"$(PODS_CONFIGURATION_BUILD_DIR)/React-bridging/react_bridging.framework/Headers\"",
                                "USE_HEADERMAP" => "YES",
-                               "CLANG_CXX_LANGUAGE_STANDARD" => "c++17" }
+                               "CLANG_CXX_LANGUAGE_STANDARD" => "c++17",
+                               "GCC_WARN_PEDANTIC" => "YES" }
 
   # TODO (T48588859): Restructure this target to align with dir structure: "react/nativemodule/..."
   # Note: Update this only when ready to minimize breaking changes.