suppress warnings

+ docu fix

Author: MartinPulec

libgpujpeg/gpujpeg_decoder.h

@@ -300,7 +300,7 @@ gpujpeg_decoder_get_image_info(uint8_t *image, size_t image_size, struct gpujpeg
 /// @copydoc GPUJPEG_ENC_OPT_CHANNEL_REMAP
 #define GPUJPEG_DEC_OPT_CHANNEL_REMAP "dec_opt_channel_remap"
 
-/// required line padding in bytes
+/// required line alignment in bytes
 #define GPUJPEG_DEC_OPT_ALIGNMENT_BYTES_INT "dec_opt_alignment_bytes"
 
 /**

src/gpujpeg_exif.c

@@ -1,6 +1,6 @@
 /**
  * @file
- * Copyright (c) 2025 CESNET, zájmové sdružení právnických osob
+ * Copyright (c) 2025-2026 CESNET, zájmové sdružení právnických osob
  *
  * All rights reserved.
  *
@@ -295,6 +295,7 @@ gpujpeg_write_ifd(struct gpujpeg_writer* writer, const uint8_t* start, size_t co
             value.uvalue = (uint32_t[]) {end - start};
         }
         const struct exif_tiff_tag_info_t* t = &exif_tiff_tag_info[info->tag];
+        (void) last_tag_id; // suppress unused if assert not used
         assert(t->id >= last_tag_id);
         last_tag_id = t->id;
         write_exif_tag(writer, t->type, t->id, exif_tiff_tag_info[info->tag].count, value, start, &end);
@@ -728,6 +729,7 @@ gpujpeg_exif_parse(uint8_t** image, const uint8_t* image_end, int verbose, struc
     for (int i = 0; i < 5; ++i) {
         exif[i] = read_byte(image);
     }
+    (void) exif; // suppress unused if assert not used
     assert(strncmp((char *) exif, "Exif", sizeof exif) == 0); // otherwise fn shouldn't be called
     read_byte(image); // drop (padding)
 

src/utils/stb_image.h

@@ -4928,6 +4928,11 @@ static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n)
    return 1;
 }
 
+#if defined __GNUC__ && !defined __clang__
+#pragma GCC diagnostic push
+// won't be used by GPUJPEG anyways
+#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
+#endif
 static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int out_n)
 {
    stbi__context *s = z->s;
@@ -4952,6 +4957,9 @@ static int stbi__compute_transparency16(stbi__png *z, stbi__uint16 tc[3], int ou
    }
    return 1;
 }
+#if defined __GNUC__ && !defined __clang__
+#pragma GCC diagnostic pop
+#endif
 
 static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n)
 {