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

问题

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.

回答1:

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.

回答2:

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!

回答3:

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

回答4:

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

回答5:

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.

回答6:

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>

来源：https://stackoverflow.com/questions/4568461/no-debugging-symbols-in-gdb-even-when-compiling-with-g-flag