I'm trying to debug an NDK program on Android (SDK 24, NDK r12b) from macOS Sierra.
After running
ndk-gdb --verbose --force --launch
I get:
GNU gdb (GDB) 7.11
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warning: Could not load shared library symbols for 142 libraries, e.g. /system/lib64/libcutils.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
0x0000007f93f84a20 in syscall ()
from /Applications/path/to/myproject/obj/local/arm64-v8a/system/lib64/libc.so
Then I found that no symbols are loaded at this point:
(gdb) i locals
No symbol table info available.
Then I loaded my native app's lib, set a breakpoint, and tried to continue:
(gdb) symbol-file /Applications/path/to/myproject/obj/local/arm64-v8a/libDemo.so
Reading symbols from /Applications/path/to/myproject/obj/local/arm64-v8a/libDemo.so...done.
(gdb) b MyClass::MyMethod
Breakpoint 1 at 0x158354: file jni/../../MyClasses/MyClass.cpp, line 45.
(gdb) c
Continuing.
Warning:
Cannot insert breakpoint 1.
Cannot access memory at address 0x158354
Command aborted.
(gdb)
From this post GDB Cannot insert breakpoint, Cannot access memory at address XXX?
I knew that this invalid memory access is because ndk-gdb cannot map the breakpoint's address. But Why? And how should I make breakpoints work?
I played around with my libs/arm64-v8a/gdb.setup and used absolute paths in there:
set sysroot
set solib-search-path /Applications/path/to/myproject/obj/local/arm64-v8a /Applications/NVPACK/ndk/platforms/android-21/arch-arm64/usr/lib
without luck.
