CODEWITHSUNDEEP
c++gccmakefilegdbdebug-symbols
delaccount992
delaccount992

Reputation: 1323

No debugging symbols in gdb even when compiling with -g flag

I am trying to compile my program with debugging symbols for use in gdb. I have added the -g flag to my makefile but I still get "Reading symbols from ...(no debugging symbols found)" when I load the program in gdb. What is wrong??

Here is a stripped down example of my makefile which should have the relevant bits:

CPP = g++
CFLAGS = -c -g -Wall

$(BIN): $(OBJ)
 $(CPP) $(LDFLAGS) $(OBJ) -o $(BIN) $(LIBS)

<test.o>: <test.cpp>
 $(CPP) $(CFLAGS) <test.cpp> -o <test.o>

If you'd like to see the whole thing you can go here instead, though I don't think it's necessary:

http://pastebin.com/vGNjy0ga

Miscellaneous notes.. I'm compiling with MinGW on Windows and I have SFML and OpenGL as dependencies.

And no, the -s flag is nowhere to be found in my makefile.

Upvotes: 15

Views: 45487

Answers (6)

ppan
ppan

Reputation: 81

I think you need -g when linking the object into a binary code.

CPP = g++
CFLAGS = -g -Wall

$(BIN): $(OBJ)
 $(CPP) $(CFLAGS) $(OBJ) -o $(BIN) $(LDFLAGS) $(LIBS)

<test.o>: <test.cpp>
 $(CPP) $(CFLAGS) -c <test.cpp> -o <test.o>

Upvotes: 1

Peter Mitrano
Peter Mitrano

Reputation: 2270

I had the same issue when using a makefile I inherited on some old F77 code. I tried all the flags people recommend (-g -ggdb ...etc.) the solution was run make clean If you don't have that or know what it means, basically delete all the compiled (.o) files.

the makefile didn't know to recompile since only flags were changed, so I wasn't actually compiling with -g or -ggdb when I thought it was. Hope this helps someone!

Upvotes: 6

delaccount992
delaccount992

Reputation: 1323

Ahh. I'm very sorry. It turns out the "clean:" portion of my makefile is broken. Thus when I used make clean nothing happened. Deleting the .o files manually fixed the problem. The flags work perfectly now. Thanks to everyone who posted anyway! This can be deleted now.

Upvotes: 6

binW
binW

Reputation: 13672

I dont have much experience with Mingw but try replacing -g with -ggdb. This may solve your problem. According to gcc man page

Produce debugging information for use by GDB. This means to use the most expressive format available (DWARF 2, stabs, or the native format if neither of those are supported), including GDB extensions if at all possible.

Upvotes: 1

Alam
Alam

Reputation: 1596

try to replace 

$(BIN): $(OBJ)
 $(CPP) $(LDFLAGS) $(OBJ) -o $(BIN) $(LIBS)

with

$(BIN): $(OBJ)
 $(CPP) $(CFLAGS) -o $(BIN) $(OBJ) $(LDFLAGS) $(LIBS)

(edit) Note: -c option will not work with executable

Upvotes: 1

JP19
JP19

Reputation:

I am not sure, but I think you need -g even while linking.

Upvotes: 0

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