Re: [PATCH v2] contrib/plugins/execlog: Fix compiler warning

[Pierrick Bouvier <pierrick.bouvier@linaro.org>]

On 3/25/24 10:06, Yao Xingtao wrote:
> 1. The g_pattern_match_string() is deprecated when glib2 version >= 2.70.
>     Use g_pattern_spec_match_string() instead to avoid this problem.
> 
> 2. The type of second parameter in g_ptr_array_add() is
>     'gpointer' {aka 'void *'}, but the type of reg->name is 'const char*'.
>     Cast the type of reg->name to 'gpointer' to avoid this problem.
> 
> compiler warning message:
> /root/qemu/contrib/plugins/execlog.c:330:17: warning: ‘g_pattern_match_string’
> is deprecated: Use 'g_pattern_spec_match_string'
> instead [-Wdeprecated-declarations]
>    330 |                 if (g_pattern_match_string(pat, rd->name) ||
>        |                 ^~
> In file included from /usr/include/glib-2.0/glib.h:67,
>                   from /root/qemu/contrib/plugins/execlog.c:9:
> /usr/include/glib-2.0/glib/gpattern.h:57:15: note: declared here
>     57 | gboolean      g_pattern_match_string   (GPatternSpec *pspec,
>        |               ^~~~~~~~~~~~~~~~~~~~~~
> /root/qemu/contrib/plugins/execlog.c:331:21: warning: ‘g_pattern_match_string’
> is deprecated: Use 'g_pattern_spec_match_string'
> instead [-Wdeprecated-declarations]
>    331 |                     g_pattern_match_string(pat, rd_lower)) {
>        |                     ^~~~~~~~~~~~~~~~~~~~~~
> /usr/include/glib-2.0/glib/gpattern.h:57:15: note: declared here
>     57 | gboolean      g_pattern_match_string   (GPatternSpec *pspec,
>        |               ^~~~~~~~~~~~~~~~~~~~~~
> /root/qemu/contrib/plugins/execlog.c:339:63: warning: passing argument 2 of
> ‘g_ptr_array_add’ discards ‘const’ qualifier from pointer target type
> [-Wdiscarded-qualifiers]
>    339 |                             g_ptr_array_add(all_reg_names, reg->name);
>        |                                                            ~~~^~~~~~
> In file included from /usr/include/glib-2.0/glib.h:33:
> /usr/include/glib-2.0/glib/garray.h:198:62: note: expected
> ‘gpointer’ {aka ‘void *’} but argument is of type ‘const char *’
>    198 |                                            gpointer          data);
>        |                                            ~~~~~~~~~~~~~~~~~~^~~~
> 
> Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2210
> Signed-off-by: Yao Xingtao <yaoxt.fnst@fujitsu.com>
> ---
>   contrib/plugins/execlog.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/contrib/plugins/execlog.c b/contrib/plugins/execlog.c
> index a1dfd59ab7..09654910ee 100644
> --- a/contrib/plugins/execlog.c
> +++ b/contrib/plugins/execlog.c
> @@ -327,8 +327,13 @@ static GPtrArray *registers_init(int vcpu_index)
>               for (int p = 0; p < rmatches->len; p++) {
>                   g_autoptr(GPatternSpec) pat = g_pattern_spec_new(rmatches->pdata[p]);
>                   g_autofree gchar *rd_lower = g_utf8_strdown(rd->name, -1);
> +#if GLIB_CHECK_VERSION(2, 70, 0)
> +                if (g_pattern_spec_match_string(pat, rd->name) ||
> +                    g_pattern_spec_match_string(pat, rd_lower)) {
> +#else
>                   if (g_pattern_match_string(pat, rd->name) ||
>                       g_pattern_match_string(pat, rd_lower)) {
> +#endif
>                       Register *reg = init_vcpu_register(rd);
>                       g_ptr_array_add(registers, reg);
>   

As suggested by Peter on previous version, you can declare a new 
function `g_pattern_match_string_qemu` in include/glib-compat.h which 
abstract this.
You'll need to add include/ to Makefile as well, so glib-compat.h will 
be accessible to contrib plugins too.

> @@ -336,7 +341,7 @@ static GPtrArray *registers_init(int vcpu_index)
>                       if (disas_assist) {
>                           g_mutex_lock(&add_reg_name_lock);
>                           if (!g_ptr_array_find(all_reg_names, reg->name, NULL)) {
> -                            g_ptr_array_add(all_reg_names, reg->name);
> +                            g_ptr_array_add(all_reg_names, (gpointer)reg->name);
>                           }
>                           g_mutex_unlock(&add_reg_name_lock);
>                       }