define empty assertion termination function for fixing linking with o…

…ld android ndk (#5847)

CMakeLists.txt

@@ -723,6 +723,12 @@ 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)
@@ -766,6 +772,10 @@ 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)

cmake/glslang_drop_ostream.cmake

@@ -0,0 +1,42 @@
+# 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()