Enable Snappy compression support in LevelDb in cmake builds (#9596)

Author: dconeybe

CMakeLists.txt

@@ -72,7 +72,6 @@ option(
   ON
 )
 
-
 list(INSERT CMAKE_MODULE_PATH 0 ${PROJECT_SOURCE_DIR}/cmake)
 include(compiler_setup)
 include(sanitizer_options)
@@ -234,6 +233,12 @@ if(NOT ZLIB_FOUND)
 endif()
 
 
+# Snappy
+set(SNAPPY_BUILD_TESTS OFF CACHE BOOL "Firestore disabled")
+set(SNAPPY_BUILD_BENCHMARKS OFF CACHE BOOL "Firestore disabled")
+add_external_subdirectory(snappy)
+firebase_ios_add_alias(Snappy::Snappy snappy)
+
 # LevelDB
 set(LEVELDB_BUILD_TESTS OFF CACHE BOOL "Firestore disabled")
 set(LEVELDB_BUILD_BENCHMARKS OFF CACHE BOOL "Firestore disabled")

Firestore/Example/Firestore.xcodeproj/project.pbxproj

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@@ -762,6 +764,7 @@
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@@ -851,6 +854,7 @@
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@@ -1066,6 +1070,7 @@
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@@ -1225,6 +1230,7 @@
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@@ -1701,6 +1707,7 @@
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