Enable incremental pod installs and fix incremental builds (#3345)

* Enable incremental CocoaPods installation

* Disable input/output path checking for generated frameworks

... to make incremental builds work properly. Without this, changes to
the framework may not be picked up in between test runs.

This does make incremental builds slightly slower, but not by much.

* Standardize on DWARF debug symbols for Debug builds

Configure this once at the project level and remove customizations.

This speeds up link times because it avoids needing to separately
generate dSYM bundles for our executables.

Author: wilhuff

Firestore/Example/Firestore.xcodeproj/project.pbxproj

@@ -4777,7 +4777,6 @@
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				COMBINE_HIDPI_IMAGES = YES;
-				DEBUG_INFORMATION_FORMAT = dwarf;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
@@ -4802,7 +4801,6 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				COMBINE_HIDPI_IMAGES = YES;
 				COPY_PHASE_STRIP = NO;
-				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
@@ -4828,7 +4826,6 @@
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_STYLE = Automatic;
-				DEBUG_INFORMATION_FORMAT = dwarf;
 				INFOPLIST_FILE = "$(SRCROOT)/App/tvOS/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
@@ -4854,7 +4851,6 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
-				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				INFOPLIST_FILE = "$(SRCROOT)/App/tvOS/Info.plist";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = NO;
@@ -4878,7 +4874,6 @@
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_STYLE = Automatic;
-				DEBUG_INFORMATION_FORMAT = dwarf;
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
@@ -4903,7 +4898,6 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
-				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
@@ -4927,7 +4921,6 @@
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_STYLE = Automatic;
-				DEBUG_INFORMATION_FORMAT = dwarf;
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
 				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
 				MTL_FAST_MATH = YES;
@@ -4952,7 +4945,6 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
-				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
 				MTL_ENABLE_DEBUG_INFO = NO;
 				MTL_FAST_MATH = YES;
@@ -4976,7 +4968,6 @@
 				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				COMBINE_HIDPI_IMAGES = YES;
-				DEBUG_INFORMATION_FORMAT = dwarf;
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
@@ -5001,7 +4992,6 @@
 				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				COMBINE_HIDPI_IMAGES = YES;
 				COPY_PHASE_STRIP = NO;
-				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = "";
 				INFOPLIST_FILE = "Tests/Tests-Info.plist";
 				MACOSX_DEPLOYMENT_TARGET = 10.11;
@@ -5034,7 +5024,6 @@
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
-				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_NO_COMMON_BLOCKS = YES;
 				INFOPLIST_FILE = ../Swift/Tests/Info.plist;
@@ -5071,7 +5060,6 @@
 				CODE_SIGN_IDENTITY = "iPhone Developer";
 				CODE_SIGN_STYLE = Automatic;
 				COPY_PHASE_STRIP = NO;
-				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_NO_COMMON_BLOCKS = YES;
 				INFOPLIST_FILE = ../Swift/Tests/Info.plist;
@@ -5143,6 +5131,7 @@
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
 				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
 				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = c99;
@@ -5439,7 +5428,6 @@
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
-				DEBUG_INFORMATION_FORMAT = dwarf;
 				DEVELOPMENT_TEAM = "";
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_NO_COMMON_BLOCKS = YES;
@@ -5478,7 +5466,6 @@
 				CODE_SIGN_STYLE = Automatic;
 				COMBINE_HIDPI_IMAGES = YES;
 				COPY_PHASE_STRIP = NO;
-				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
 				DEVELOPMENT_TEAM = "";
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
 				GCC_NO_COMMON_BLOCKS = YES;

Firestore/Example/Podfile

@@ -9,6 +9,17 @@ source 'https://cdn.cocoapods.org/'
 
 use_frameworks!
 
+install! 'cocoapods',
+    :generate_multiple_pod_projects => true,
+    :incremental_installation => true,
+    # Disable input/output path checking for generated frameworks to make
+    # incremental builds work properly. Without this, changes to the framework
+    # may not be picked up in between test runs.
+    #
+    # See:
+    #   https://github.com/CocoaPods/CocoaPods/issues/8073
+    #   https://www.ralfebert.de/ios/blog/cocoapods-clean-input-output-files/
+    :disable_input_output_paths => true
 
 post_install do |installer|
   sync = Pathname.new(__FILE__).dirname.join('../../scripts/sync_project.rb')