https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106979
Bug ID: 106979
Summary: Gcov tutorial for Freestanding Environments failing
Product: gcc
Version: 11.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: gcov-profile
Assignee: unassigned at gcc dot gnu.org
Reporter: rob at lightmatter dot co
CC: marxin at gcc dot gnu.org
Target Milestone: ---
cat /etc/os-release
PRETTY_NAME="Ubuntu 22.04.1 LTS"
gcc --version
gcc (Ubuntu 11.2.0-19ubuntu1) 11.2.0
Following the documentation here:
https://gcc.gnu.org/onlinedocs/gcc/Freestanding-Environments.html
---------- Warning ----------
The following step:
Compile app.c and main.c with test coverage and -fprofile-info-section.
Produces a warning:
gcc -fprofile-arcs -ftest-coverage -fprofile-info-section -c main.c
main.c: In function 'filename':
main.c:35:3: warning: implicit declaration of function
'__gcov_filename_to_gcfn' [-Wimplicit-function-declaration]
35 | __gcov_filename_to_gcfn (f, dump, arg);
| ^~~~~~~~~~~~~~~~~~~~~~~
main.c: In function 'dump_gcov_info':
main.c:63:5: warning: implicit declaration of function '__gcov_info_to_gcda'
[-Wimplicit-function-declaration]
63 | __gcov_info_to_gcda (*info, filename, dump, allocate, arg);
| ^~~~~~~~~~~~~~~~~~~
---------- Failure ----------
Subsequent step fails:
gcc --coverage main.o app.o -T linkcmds -Wl,-Map,app.map
/usr/bin/ld: main.o: in function `filename':
main.c:(.text+0x10c): undefined reference to `__gcov_filename_to_gcfn'
/usr/bin/ld: main.o: in function `dump_gcov_info':
main.c:(.text+0x196): undefined reference to `__gcov_info_to_gcda'
collect2: error: ld returned 1 exit status
make: *** [Makefile:38: test3] Error 1
