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meson: avoid bogus warnings from clang and g_autoptr

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Clang has previously had trouble with G_DEFINE_AUTOPTR_CLEANUP_FUNC
generated code, thinking it was unused. We turn off -Wunused-function
to avoid tripping up on that with CLang.

New Clang has started having trouble with g_autoptr now too. In usage
scenarios where the variable is set, but never again read, it thinks
it is unused not realizing the destructor has useful side effects.
For this we have to skip -Wunused-but-set-variable on CLang.

Reviewed-by: Pavel Hrdina <phrdina@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrangé 2021-08-31 15:05:15 +01:00
parent 7d12421835
commit 345996c620
2 changed files with 22 additions and 1 deletions
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2
build-aux/syntax-check.mk
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@ -1589,7 +1589,7 @@ exclude_file_name_regexp--sc_prohibit_canonicalize_file_name = \
^(build-aux/syntax-check\.mk|tests/virfilemock\.c)$$
exclude_file_name_regexp--sc_prohibit_raw_allocation = \
^(docs/advanced-tests\.rst|src/util/viralloc\.[ch]|examples/.*|tests/(securityselinuxhelper|(vircgroup|nss)mock|commandhelper)\.c|tools/wireshark/src/packet-libvirt\.c|tools/nss/libvirt_nss(_leases|_macs)?\.c)$$
^(meson\.build|docs/advanced-tests\.rst|src/util/viralloc\.[ch]|examples/.*|tests/(securityselinuxhelper|(vircgroup|nss)mock|commandhelper)\.c|tools/wireshark/src/packet-libvirt\.c|tools/nss/libvirt_nss(_leases|_macs)?\.c)$$
exclude_file_name_regexp--sc_prohibit_readlink = \
^src/(util/virutil|lxc/lxc_container)\.c$$

21
meson.build
View File

@ -470,6 +470,27 @@ if get_option('warning_level') == '2'
supported_cc_flags += [ '-Wno-unused-function' ]
endif
if supported_cc_flags.contains('-Wunused-but-set-variable')
# Clang complains about unused variables in many scenarios related
# to attribute((cleanup)) aka g_auto*
w_unused_but_set_var_args = [ '-Wunused-but-set-variable', '-Werror' ]
w_unused_but_set_var_code = '''
static inline void free_pointer (void *p) {
void **pp = (void**)p;
free (*pp);
}
int main(void) {
__attribute__((cleanup(free_pointer))) char *buffer = 0x0;
buffer = 0x1;
}
'''
# We previously turned on unused-but-set-variable, so we must turn
# it off again explicitly now.
if not cc.compiles(w_unused_but_set_var_code, args: w_unused_but_set_var_args)
supported_cc_flags += [ '-Wno-unused-but-set-variable' ]
endif
endif
endif
add_project_arguments(supported_cc_flags, language: 'c')