diff --git a/CMakeLists.txt b/CMakeLists.txt
index df135be52c6..2b532d7c245 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -723,12 +723,6 @@ if(CMAKE_SYSTEM_NAME STREQUAL "Emscripten")
     endif()
 endif()
 
-if(ANDROID_NDK_MAJOR AND (ANDROID_NDK_MAJOR GREATER_EQUAL 27))
-    # llvm 18 in ndk-27 introduce __libcpp_verbose_abort for assertion output
-    # define empty body for fixing linking issue with old ndk
-    add_definitions("-D_LIBCPP_VERBOSE_ABORT\\(format,args...\\)=")
-endif()
-
 if(NCNN_VULKAN)
     if(NCNN_SYSTEM_GLSLANG)
         find_package(Threads)
@@ -772,10 +766,6 @@ if(NCNN_VULKAN)
             # glslang requires c++11
             set(CMAKE_CXX_STANDARD 11)
 
-            # remove ostream usage in glslang for better libcpp abi compatibility
-            include(cmake/glslang_drop_ostream.cmake)
-            glslang_drop_ostream(${CMAKE_CURRENT_LIST_DIR}/glslang)
-
             option(BUILD_EXTERNAL "" OFF)
             option(ENABLE_SPVREMAPPER "" OFF)
             option(ENABLE_GLSLANG_BINARIES "" OFF)
diff --git a/cmake/glslang_drop_ostream.cmake b/cmake/glslang_drop_ostream.cmake
deleted file mode 100644
index 192a524241e..00000000000
--- a/cmake/glslang_drop_ostream.cmake
+++ /dev/null
@@ -1,42 +0,0 @@
-# this cmake script remove ostream usage in glslang
-
-function(glslang_drop_ostream GLSLANG_ROOT)
-
-    # patch glslang/SPIRV/GlslangToSpv.h
-    file(STRINGS ${GLSLANG_ROOT}/SPIRV/GlslangToSpv.h GlslangToSpv_HDR)
-    file(WRITE ${GLSLANG_ROOT}/SPIRV/GlslangToSpv.h "")
-    foreach(LINE IN LISTS GlslangToSpv_HDR)
-        if(LINE MATCHES "^bool OutputSpvBin(.*);" OR LINE MATCHES "^bool OutputSpvHex(.*);")
-            continue()
-        endif()
-
-        file(APPEND ${GLSLANG_ROOT}/SPIRV/GlslangToSpv.h "${LINE}\n")
-    endforeach()
-
-    # patch glslang/SPIRV/GlslangToSpv.cpp
-    file(STRINGS ${GLSLANG_ROOT}/SPIRV/GlslangToSpv.cpp GlslangToSpv_SRC)
-    file(WRITE ${GLSLANG_ROOT}/SPIRV/GlslangToSpv.cpp "")
-    foreach(LINE IN LISTS GlslangToSpv_SRC)
-        if(LINE MATCHES "^bool OutputSpvBin(.*)")
-            set(GlslangToSpv_SRC_OutputSpvBin TRUE)
-        endif()
-        if(LINE MATCHES "^bool OutputSpvHex(.*)")
-            set(GlslangToSpv_SRC_OutputSpvHex TRUE)
-        endif()
-
-        if(GlslangToSpv_SRC_OutputSpvBin OR GlslangToSpv_SRC_OutputSpvHex)
-            if(LINE MATCHES "^}$")
-                if(GlslangToSpv_SRC_OutputSpvBin)
-                    unset(GlslangToSpv_SRC_OutputSpvBin)
-                endif()
-                if(GlslangToSpv_SRC_OutputSpvHex)
-                    unset(GlslangToSpv_SRC_OutputSpvHex)
-                endif()
-            endif()
-            continue()
-        endif()
-
-        file(APPEND ${GLSLANG_ROOT}/SPIRV/GlslangToSpv.cpp "${LINE}\n")
-    endforeach()
-
-endfunction()