gdb 8.2 can't recognized executable file on macOS Mojave 10.14

Question

I get gdb by brew install gdb.

The source file content is:

#include 
int main(){
    int a = 10;
    for(int i = 0; i<          


        

Answer 1

Upgrade to GDB version 8.3. Also see Issue 23728, binutils fail on macOS 10.14 (Mojave) due to unimpl in the Binutils bug tracker.

From the bug report:

I've found the root of the issue. binutils does not handle load command 0x32 LC_BUILD_VERSION (nor 0x31 LC_NOTE, actually). They are defined in recent LLVM versions: see https://github.com/llvm-mirror/llvm/blob/master/include/llvm/BinaryFormat/MachO.def#L77

Looking at the output of objdump -private-headers there is one clear difference:

@@ -56,16 +56,18 @@ attributes NO_TOC STRIP_STATIC_SYMS LIVE
  reserved1 0
  reserved2 0
 Load command 1
-      cmd LC_VERSION_MIN_MACOSX
-  cmdsize 16
-  version 10.13
-      sdk n/a
+       cmd LC_BUILD_VERSION
+   cmdsize 24
+  platform macos
+       sdk n/a
+     minos 10.14
+    ntools 0
 Load command 2
      cmd LC_SYMTAB
  cmdsize 24

LC_VERSION_MIN_MACOSX is implemented in binutils, while LC_BUILD_VERSION is not. It is apparently new in Mojave.

Answer 2

The answer by timotheecour above did work for me:

brew install https://raw.githubusercontent.com/timotheecour/homebrew-timutil/master/gdb_tim.rb

Then I had to generate a generate a self-signed certificate as in https://www.thomasvitale.com/how-to-setup-gdb-and-eclipse-to-debug-c-files-on-macos-sierra/