examples: Collects coverage info in component

examples/system/gcov/README.md

@@ -63,10 +63,12 @@ See the Getting Started Guide for full steps to configure and use ESP-IDF to bui
 The example will initially execute two hard-coded dumps. Therefore, when the application outputs `Ready to dump GCOV data...`, users should execute the `esp32 gcov dump` OpenOCD command. The example should output the following:
 
 ```
-Counter = 0
+blink_dummy_func: Counter = 0
+some_dummy_func: Counter = 0
 Ready to dump GCOV data...
 GCOV data have been dumped.
-Counter = 1
+blink_dummy_func: Counter = 1
+some_dummy_func: Counter = 2
 Ready to dump GCOV data...
 GCOV data have been dumped.
 ```
@@ -76,15 +78,24 @@ GCOV data have been dumped.
 After the two hard-coded dumps, the example will continue looping through it's main blink function. Users can call `esp32 gcov` OpenOCD command to trigger an instant run-time dump. The output should resemble the following:
 
 ```
-Counter = 2
-Counter = 3
-Counter = 4
-Counter = 5
-Counter = 6
-Counter = 7
-Counter = 8
-Counter = 9
-Counter = 10
+blink_dummy_func: Counter = 2
+some_dummy_func: Counter = 4
+blink_dummy_func: Counter = 3
+some_dummy_func: Counter = 6
+blink_dummy_func: Counter = 4
+some_dummy_func: Counter = 8
+blink_dummy_func: Counter = 5
+some_dummy_func: Counter = 10
+blink_dummy_func: Counter = 6
+some_dummy_func: Counter = 12
+blink_dummy_func: Counter = 7
+some_dummy_func: Counter = 14
+blink_dummy_func: Counter = 8
+some_dummy_func: Counter = 16
+blink_dummy_func: Counter = 9
+some_dummy_func: Counter = 18
+blink_dummy_func: Counter = 10
+some_dummy_func: Counter = 20
 ...
 ```
 
@@ -99,26 +110,30 @@ To clean Gcov and report related data from the build directory, call `cmake --bu
 The following log should be output when generating the coverage report:
 
 ```
-Generating coverage report in: /home/alexey/projects/esp/esp-idf/examples/system/gcov/build/coverage_report
-Using gcov: ~/projects/esp/crosstool-NG/builds/xtensa-esp32-elf/bin/xtensa-esp32-elf-gcov
-Capturing coverage data from /home/alexey/projects/esp/esp-idf/examples/system/gcov/build
-Found gcov version: 5.2.0
-Scanning /home/alexey/projects/esp/esp-idf/examples/system/gcov/build for .gcda files ...
-Found 2 data files in /home/alexey/projects/esp/esp-idf/examples/system/gcov/build
-Processing main/gcov_example_func.gcda
-Processing main/gcov_example.gcda
+[1/1] Generating coverage report in: /home/user/projects/esp/tmp_idf/esp-idf/examples/system/gcov/build/coverage_report
+Using gcov: xtensa-esp32-elf-gcov
+Capturing coverage data from /home/user/projects/esp/tmp_idf/esp-idf/examples/system/gcov/build
+Found gcov version: 8.2.0
+Using intermediate gcov format
+Scanning /home/user/projects/esp/tmp_idf/esp-idf/examples/system/gcov/build for .gcda files ...
+Found 3 data files in /home/user/projects/esp/tmp_idf/esp-idf/examples/system/gcov/build
+Processing sample/CMakeFiles/__idf_sample.dir/some_funcs.c.gcda
+Processing main/CMakeFiles/__idf_main.dir/gcov_example_func.c.gcda
+Processing main/CMakeFiles/__idf_main.dir/gcov_example_main.c.gcda
 Finished .info-file creation
-Reading data file /home/alexey/projects/esp/esp-idf/examples/system/gcov/build/coverage_report/gcov_example.info
-Found 2 entries.
-Found common filename prefix "/home/alexey/projects/esp/esp-idf/examples/system/gcov"
+Reading data file /home/user/projects/esp/tmp_idf/esp-idf/examples/system/gcov/build/coverage_report/gcov_example.info
+Found 4 entries.
+Found common filename prefix "/home/user/projects/esp/tmp_idf/esp-idf/examples/system/gcov"
 Writing .css and .png files.
 Generating output.
-Processing file main/gcov_example.c
+Processing file /home/user/projects/esp/tmp_idf/esp-idf/components/freertos/include/freertos/task.h
+Processing file components/sample/some_funcs.c
+Processing file main/gcov_example_main.c
 Processing file main/gcov_example_func.c
 Writing directory view page.
 Overall coverage rate:
-  lines......: 90.0% (18 of 20 lines)
-  functions..: 100.0% (3 of 3 functions)
+  lines......: 100.0% (28 of 28 lines)
+  functions..: 100.0% (4 of 4 functions)
 ```
 
 ## Troubleshooting

examples/system/gcov/components/sample/CMakeLists.txt

@@ -0,0 +1,6 @@
+idf_component_register(SRCS "some_funcs.c"
+                    INCLUDE_DIRS ".")
+
+set_source_files_properties(some_funcs.c
+    PROPERTIES COMPILE_FLAGS
+    --coverage)

examples/system/gcov/components/sample/component.mk

@@ -0,0 +1,6 @@
+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)
+
+CFLAGS += --coverage

examples/system/gcov/components/sample/some_funcs.c

@@ -0,0 +1,10 @@
+#include <stdio.h>
+
+
+void some_dummy_func(void)
+{
+    static int i;
+    printf("some_dummy_func: Counter = %d\n", i++);
+    i++;
+}
+

examples/system/gcov/main/gcov_example_func.c

@@ -4,6 +4,6 @@
 void blink_dummy_func(void)
 {
     static int i;
-    printf("Counter = %d\n", i++);
+    printf("blink_dummy_func: Counter = %d\n", i++);
 }
 

examples/system/gcov/main/gcov_example_main.c

@@ -19,6 +19,7 @@
 #define BLINK_GPIO CONFIG_BLINK_GPIO
 
 void blink_dummy_func(void);
+void some_dummy_func(void);
 
 static void blink_task(void *pvParameter)
 {
@@ -43,6 +44,7 @@ static void blink_task(void *pvParameter)
         gpio_set_level(BLINK_GPIO, 1);
         vTaskDelay(500 / portTICK_PERIOD_MS);
         blink_dummy_func();
+        some_dummy_func();
         if (dump_gcov_after++ < 0) {
             // Dump gcov data
             printf("Ready to dump GCOV data...\n");