vrend: silence warnings when NDEBUG is defined

For this introduce a NDEBUG_UNUSED macro

v2: Replace NDEBUG_UNUSED with MAYBE_UNUSED (Emil)
    Silence unused warnings only if NDEBUG is defined

Signed-off-by: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>

src/gallium/auxiliary/os/os_misc.h

@@ -45,8 +45,12 @@
 
 #ifdef __GNUC__
 #define UNUSED __attribute__((unused))
+#ifdef NDEBUG
 #define MAYBE_UNUSED __attribute__((unused))
 #else
+#define MAYBE_UNUSED
+#endif
+#else
 #define UNUSED
 #define MAYBE_UNUSED
 #endif

src/vrend_blitter.c

@@ -706,7 +706,7 @@ static void calc_dst_deltas_from_src(const struct pipe_blit_info *info,
 }
 
 /* implement blitting using OpenGL. */
-void vrend_renderer_blit_gl(struct vrend_context *ctx,
+void vrend_renderer_blit_gl(MAYBE_UNUSED struct vrend_context *ctx,
                             struct vrend_resource *src_res,
                             struct vrend_resource *dst_res,
                             GLenum blit_views[2],

src/vrend_renderer.c

@@ -815,6 +815,7 @@ static void __report_core_warn(const char *fname, struct vrend_context *ctx,
 #define GLES_WARN_LOGIC_OP 15
 #define GLES_WARN_TIMESTAMP 16
 
+MAYBE_UNUSED
 static const char *vrend_gles_warn_strings[] = {
    [GLES_WARN_NONE]             = "None",
    [GLES_WARN_STIPPLE]          = "Stipple",
@@ -834,15 +835,17 @@ static const char *vrend_gles_warn_strings[] = {
    [GLES_WARN_TIMESTAMP]        = "GL_TIMESTAMP",
 };
 
-static void __report_gles_warn(const char *fname, struct vrend_context *ctx,
+static void __report_gles_warn(MAYBE_UNUSED const char *fname,
-                               enum virgl_ctx_errors error)
+                               MAYBE_UNUSED struct vrend_context *ctx,
+                               MAYBE_UNUSED enum virgl_ctx_errors error)
 {
    VREND_DEBUG(dbg_gles, ctx, "%s: GLES violation - %s\n", fname, vrend_gles_warn_strings[error]);
 }
 #define report_gles_warn(ctx, error) __report_gles_warn(__func__, ctx, error)
 
-static void __report_gles_missing_func(const char *fname,
+static void __report_gles_missing_func(MAYBE_UNUSED const char *fname,
-                                       struct vrend_context *ctx, const char *missf)
+                                       MAYBE_UNUSED struct vrend_context *ctx,
+                                       MAYBE_UNUSED const char *missf)
 {
    VREND_DEBUG(dbg_gles, ctx, "%s: GLES function %s is missing\n", fname, missf);
 }
@@ -1123,6 +1126,7 @@ static void vrend_stencil_test_enable(struct vrend_context *ctx, bool stencil_te
    }
 }
 
+MAYBE_UNUSED
 static void dump_stream_out(struct pipe_stream_output_info *so)
 {
    unsigned i;
@@ -1170,7 +1174,8 @@ static char *get_skip_str(int *skip_val)
    return start_skip;
 }
 
-static void set_stream_out_varyings(struct vrend_context *ctx, int prog_id,
+static void set_stream_out_varyings(MAYBE_UNUSED struct vrend_context *ctx,
+                                    int prog_id,
                                     struct vrend_shader_info *sinfo)
 {
    struct pipe_stream_output_info *so = &sinfo->so_info;
@@ -2108,9 +2113,9 @@ int vrend_create_sampler_view(struct vrend_context *ctx,
 }
 
 static
-void debug_texture(const char *f, const struct vrend_resource *gt)
+void debug_texture(MAYBE_UNUSED const char *f, const struct vrend_resource *gt)
 {
-   const struct pipe_resource *pr = &gt->base;
+   MAYBE_UNUSED const struct pipe_resource *pr = &gt->base;
 #define PRINT_TARGET(X) case X: vrend_printf( #X); break
    VREND_DEBUG_EXT(dbg_tex, NULL,
                vrend_printf("%s: ", f);

src/vrend_shader.c

@@ -6635,7 +6635,7 @@ static bool allocate_strbuffers(struct dump_ctx* ctx)
    return true;
 }
 
-static void set_strbuffers(struct vrend_context *rctx, struct dump_ctx* ctx,
+static void set_strbuffers(MAYBE_UNUSED struct vrend_context *rctx, struct dump_ctx* ctx,
                            struct vrend_strarray *shader)
 {
    strarray_addstrbuf(shader, &ctx->glsl_ver_ext);
@@ -6786,7 +6786,7 @@ static void require_gpu_shader5_and_msinterp(struct vrend_strarray *program)
    strbuf_append(&program->strings[SHADER_STRING_VER_EXT], gpu_shader5_and_msinterp_string);
 }
 
-bool vrend_patch_vertex_shader_interpolants(struct vrend_context *rctx,
+bool vrend_patch_vertex_shader_interpolants(MAYBE_UNUSED struct vrend_context *rctx,
                                             struct vrend_shader_cfg *cfg,
                                             struct vrend_strarray *prog_strings,
                                             struct vrend_shader_info *vs_info,