Fix: Set SNAPPY_HAVE_BMI2 to 0 to avoid crashes on older CPUs (#1815)

* Fix: Set SNAPPY_HAVE_BMI2 to 0 to avoid crashes on older CPUs without BMI2.

* Add FORCE as suggested by Gemini Code assist.

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Co-authored-by: a-maurice <amaurice@google.com>

Author: EllieTellie

CMakeLists.txt

@@ -362,6 +362,10 @@ if(FIRESTORE_USE_EXTERNAL_CMAKE_BUILD)
     CACHE BOOL "Force Firestore build tests to match")
   endif()
 
+  # Disable Snappy's BMI2 optimizations for broader CPU compatibility.
+  # BMI2 instructions cause Illegal Instruction crashes on older CPUs that don't support BMI2.
+  set(SNAPPY_HAVE_BMI2 0 CACHE INTERNAL "Disable BMI2 for CPU compatibility" FORCE)
+
   add_subdirectory(${FIRESTORE_SOURCE_DIR} ${FIRESTORE_BINARY_DIR})
 
   copy_subdirectory_definition(${FIRESTORE_SOURCE_DIR} NANOPB_SOURCE_DIR)