Add configure option to enable gcov analysis

* Add configure option to enable gcov analysis.
* Includes a few minor ctime fixes.
* Add codecov.yml configuration.

Reviewed-by: Prakash Surya <prakash.surya@delphix.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes openzfs#6642

.github/codecov.yml

@@ -0,0 +1,9 @@
+codecov:
+  strict_yaml_branch: master # only use the latest copy on master branch
+
+comment: off
+
+coverage:
+  status:
+    project: off
+    patch: off

.gitignore

@@ -19,6 +19,8 @@
 *.mod.c
 *~
 *.swp
+*.gcno
+*.gcda
 .deps
 .libs
 .dirstamp

Makefile.am

@@ -29,10 +29,10 @@ distclean-local::
 		-o -name .pc -o -name .hg -o -name .git \) -prune -o \
 		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
 		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
-		-o -name '.*.rej' -o -name '.script-config' -o -size 0 \
-		-o -name '*%' -o -name '.*.cmd' -o -name 'core' \
-		-o -name 'Makefile' -o -name 'Module.symvers' \
-		-o -name '*.order' -o -name '*.markers' \) \
+		-o -name '.*.rej' -o -size 0 -o -name '*%' -o -name '.*.cmd' \
+		-o -name 'core' -o -name 'Makefile' -o -name 'Module.symvers' \
+		-o -name '*.order' -o -name '*.markers' -o -name '*.gcda' \
+		-o -name '*.gcno' \) \
 		-type f -print | xargs $(RM)
 
 dist-hook:

config/zfs-build.m4

@@ -75,6 +75,37 @@ AC_DEFUN([ZFS_AC_DEBUGINFO], [
 	AC_MSG_RESULT([$enable_debuginfo])
 ])
 
+AC_DEFUN([ZFS_AC_GCOV_KERNEL], [
+])
+
+AC_DEFUN([ZFS_AC_GCOV_USER], [
+	DEBUG_CFLAGS="$DEBUG_CFLAGS -fprofile-arcs -ftest-coverage"
+])
+
+AC_DEFUN([ZFS_AC_GCOV], [
+	AC_MSG_CHECKING([whether gcov profiling will be enabled])
+	AC_ARG_ENABLE([gcov],
+		[AS_HELP_STRING([--enable-gcov],
+		[Enable gcov profiling @<:@default=no@:>@])],
+		[],
+		[enable_gcov=no])
+
+	AS_CASE(["x$enable_gcov"],
+		["xyes"],
+		[ZFS_AC_GCOV_KERNEL
+		ZFS_AC_GCOV_USER],
+		["xkernel"],
+		[ZFS_AC_GCOV_KERNEL],
+		["xuser"],
+		[ZFS_AC_GCOV_USER],
+		["xno"],
+		[],
+		[AC_MSG_ERROR([Unknown option $enable_gcov])])
+
+	AC_SUBST(DEBUG_CFLAGS)
+	AC_MSG_RESULT([$enable_gcov])
+])
+
 AC_DEFUN([ZFS_AC_CONFIG_ALWAYS], [
 	ZFS_AC_CONFIG_ALWAYS_NO_UNUSED_BUT_SET_VARIABLE
 	ZFS_AC_CONFIG_ALWAYS_NO_BOOL_COMPARE

configure.ac

@@ -56,6 +56,7 @@ ZFS_AC_PACKAGE
 ZFS_AC_CONFIG
 ZFS_AC_DEBUG
 ZFS_AC_DEBUGINFO
+ZFS_AC_GCOV
 
 AC_CONFIG_FILES([
 	Makefile

tests/zfs-tests/tests/functional/ctime/.gitignore

@@ -1 +1 @@
-/ctime_001_pos
+/ctime