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meson: explicitly include coverage tweaks when built w/ --coverage

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To make sure we don't miss any _exit() calls let's move the
coverage-related tweaks into a separate header file and include it
explicitly on the compiler command line using -include when a coverage
build is requested.

Follow-up to c6552ad381.
This commit is contained in:
Frantisek Sumsal 2022-04-08 13:20:15 +02:00 committed by Yu Watanabe
parent 492f9e74ff
commit 7e43be7d0e
3 changed files with 26 additions and 16 deletions
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10
meson.build
View File

@ -47,9 +47,6 @@ fuzzer_build = want_ossfuzz or want_libfuzzer
# More items are added later after they have been detected.
summary({'build mode' : get_option('mode')})
# GCOV doesn't define any macro when compiled with, so let's define it ourselves
conf.set10('BUILT_WITH_COVERAGE', get_option('b_coverage'))
#####################################################################
# Try to install the git pre-commit hook
@ -1823,6 +1820,12 @@ export_dbus_interfaces_py = find_program('tools/dbus_exporter.py')
############################################################
if get_option('b_coverage')
add_project_arguments('-include', 'src/basic/coverage.h', language : 'c')
endif
############################################################
config_h = configure_file(
output : 'config.h',
configuration : conf)
@ -4230,6 +4233,7 @@ foreach tuple : [
['link-boot-shared', get_option('link-boot-shared')],
['fexecve'],
['standalone-binaries', get_option('standalone-binaries')],
['coverage', get_option('b_coverage')],
]
if tuple.length() >= 2

19
src/basic/coverage.h Normal file
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@ -0,0 +1,19 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
/* When built with --coverage (gcov) we need to explicitly call __gcov_dump()
* in places where we use _exit(), since _exit() skips at-exit hooks resulting
* in lost coverage.
*
* To make sure we don't miss any _exit() calls, this header file is included
* explicitly on the compiler command line via the -include directive (only
* when built with -Db_coverage=true)
* */
extern void _exit(int);
extern void __gcov_dump(void);
static inline void _coverage__exit(int status) {
__gcov_dump();
_exit(status);
}
#define _exit(x) _coverage__exit(x)

13
src/basic/macro.h
View File

@ -29,19 +29,6 @@
#define _alignptr_ __attribute__((__aligned__(sizeof(void*))))
#define _warn_unused_result_ __attribute__((__warn_unused_result__))
#if defined(BUILT_WITH_COVERAGE) && BUILT_WITH_COVERAGE
/* We need to explicitly call __gcov_dump() in places where we use _exit(), since
* _exit() skips at-exit hooks resulting in lost coverage */
# include <unistd.h>
extern void __gcov_dump(void);
_noreturn_ static inline void _coverage__exit(int status) {
__gcov_dump();
_exit(status);
}
# define _exit(x) _coverage__exit(x)
#endif
#if !defined(HAS_FEATURE_MEMORY_SANITIZER)
# if defined(__has_feature)
# if __has_feature(memory_sanitizer)