Ping http://gcc.gnu.org/ml/gcc-help/2012-06/msg00091.html On 8 June 2012 16:53, Mohamed Shafi <shafitvm@xxxxxxxxx> wrote: > Hi, > > I tried debugging the following function with arm and native C and C++ compiler. > > void func(int in) > { > int a; > in++; > { > int k, j; > k = 10; > j = k + 44; > in = j + 1; > a = in; > } <------ Line 1 > a = in; > a++; > } <--------- Line 2 > > When i try to print the value of 'a' when the execution reaches "line > 2" i get the message "No symbol "a" in current context.". Here is the > gdb output: > > (gdb) l > 15 j = k + 44; > 16 in = j + 1; > 17 a = in; > 18 } > 19 a = in; > 20 a++; > 21 } > 22 > 23 int main() > 24 { > (gdb) s > 21 } > (gdb) p a > No symbol "a" in current context. > (gdb) p in > $1 = 55 > (gdb) > > For the same program i am able to view the value of 'a' if i compile > this as a C program. This happens because DW_TAG_lexical_block which > is generated only for in C++ debug info marks the scope of variable > 'a' between prologue and epilogue of the code. Since the epilogue is > not present in the scope, the variable cannot be viewed when the > control reaches the closing brace of the function. > > Is this an expected behavior? > Since in C i can view the variable at the end of the function is not > logical to have the same behavior for C++ code also? > > Regards, > Shafi
