* debug makefile based c-helloworld application
@ 2020-05-28 16:28 cschmidt
0 siblings, 0 replies; only message in thread
From: cschmidt @ 2020-05-28 16:28 UTC (permalink / raw)
To: yocto
I try to debug a simple helloworld program but i can't see the source
code. My approach:
hello.c
```
#include<stdio.h>
int main() {
printf("Hello World\n");
return 0;
}
```
hellome.bb
```
#
# This file was derived from the 'Hello World!' example recipe in the
# Yocto Project Development Manual.
#
SUMMARY = "Simple helloworld application"
LICENSE = "CLOSED"
SRC_URI = "file://hello.c"
S = "${WORKDIR}"
TARGET_CC_ARCH += "${LDFLAGS}"
do_compile() {
${CC} hello.c -o -g -O0 hello
}
do_install() {
install -d ${D}${bindir}
install -m 0755 hello ${D}${bindir}
}
```
Makefile
```
SOURCES=hello.c
OBJECTS=$(SOURCES:.c=.o)
EXEC=hello
#EXTRACFLAGS=-ansi
all: $(SOURCES) $(EXEC)
$(EXEC): $(OBJECTS)
$(CC) $(CFLAGS) $(EXTRACFLAGS) $(OBJECTS) -o $@
%.o : %c
$(CC) $(CFLAGS) $(EXTRACFLAGS) -c $<
install:
install $(EXEC) $(DESTDIR)/usr/bin
clean:
rm -rf *.o $(EXEC)
```
local.conf
```
....
IMAGE_INSTALL_append = " hellome hellome-dbg hellome-dev"
EXTRA_IMAGE_FEATURES += "\
dbg-pkgs \
tools-debug \
debug-tweaks \
dev-pkgs"
# Specifies to build packages with debugging information
DEBUG_BUILD = "1"
# Do not remove debug symbols
INHIBIT_PACKAGE_STRIP = "1"
```
on the target:
```
root@qemuarm:~# hello
Hello World
root@qemuarm:~# gdb /usr/bin/hello
Reading symbols from /usr/bin/hello...
(gdb) b main
Breakpoint 1 at 0x518
(gdb) r
Starting program: /usr/bin/hello
Breakpoint 1, 0x00400518 in main ()
(gdb) list
1 longjmp.c: No such file or directory.
(gdb) list 1
file: "../setjmp/longjmp.c", line number: 1, symbol: "???"
1 ../setjmp/longjmp.c: No such file or directory.
file: "longjmp.c", line number: 1, symbol: "???"
1 longjmp.c: No such file or directory.
```
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