Prefix symbols from stb_image.h

This makes it possible to link assimp statically into an executable with
another static library that includes stb_image.h without hiding its
symbols.

code/Common/StbCommon.h

@@ -48,6 +48,64 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #pragma GCC diagnostic ignored "-Wunused-function"
 #endif
 
+#ifndef STB_USE_HUNTER
+/*  Use prefixed names for the symbols from stb_image as it is a very commonly embedded library.
+    Including vanilla stb_image symbols causes duplicate symbol problems if assimp is linked
+    statically together with another library or executable that also embeds stb_image.
+
+    Symbols are not prefixed if using Hunter because in such case there exists a single true
+    stb_image library on the system that is used by assimp and can be used by all the other
+    libraries and executables.
+
+    The list can be regenerated using the following:
+
+    cat <path/to/stb/stb_image.h> | fgrep STBIDEF | fgrep '(' | sed -E 's/\*|\(.+//g' | \
+        awk '{print "#define " $(NF) " assimp_" $(NF) }' | sort | uniq"
+*/
+#define stbi_convert_iphone_png_to_rgb assimp_stbi_convert_iphone_png_to_rgb
+#define stbi_convert_wchar_to_utf8 assimp_stbi_convert_wchar_to_utf8
+#define stbi_failure_reason assimp_stbi_failure_reason
+#define stbi_hdr_to_ldr_gamma assimp_stbi_hdr_to_ldr_gamma
+#define stbi_hdr_to_ldr_scale assimp_stbi_hdr_to_ldr_scale
+#define stbi_image_free assimp_stbi_image_free
+#define stbi_info assimp_stbi_info
+#define stbi_info_from_callbacks assimp_stbi_info_from_callbacks
+#define stbi_info_from_file assimp_stbi_info_from_file
+#define stbi_info_from_memory assimp_stbi_info_from_memory
+#define stbi_is_16_bit assimp_stbi_is_16_bit
+#define stbi_is_16_bit_from_callbacks assimp_stbi_is_16_bit_from_callbacks
+#define stbi_is_16_bit_from_file assimp_stbi_is_16_bit_from_file
+#define stbi_is_16_bit_from_memory assimp_stbi_is_16_bit_from_memory
+#define stbi_is_hdr assimp_stbi_is_hdr
+#define stbi_is_hdr_from_callbacks assimp_stbi_is_hdr_from_callbacks
+#define stbi_is_hdr_from_file assimp_stbi_is_hdr_from_file
+#define stbi_is_hdr_from_memory assimp_stbi_is_hdr_from_memory
+#define stbi_ldr_to_hdr_gamma assimp_stbi_ldr_to_hdr_gamma
+#define stbi_ldr_to_hdr_scale assimp_stbi_ldr_to_hdr_scale
+#define stbi_load_16 assimp_stbi_load_16
+#define stbi_load_16_from_callbacks assimp_stbi_load_16_from_callbacks
+#define stbi_load_16_from_memory assimp_stbi_load_16_from_memory
+#define stbi_load assimp_stbi_load
+#define stbi_loadf assimp_stbi_loadf
+#define stbi_loadf_from_callbacks assimp_stbi_loadf_from_callbacks
+#define stbi_loadf_from_file assimp_stbi_loadf_from_file
+#define stbi_loadf_from_memory assimp_stbi_loadf_from_memory
+#define stbi_load_from_callbacks assimp_stbi_load_from_callbacks
+#define stbi_load_from_file_16 assimp_stbi_load_from_file_16
+#define stbi_load_from_file assimp_stbi_load_from_file
+#define stbi_load_from_memory assimp_stbi_load_from_memory
+#define stbi_load_gif_from_memory assimp_stbi_load_gif_from_memory
+#define stbi_set_flip_vertically_on_load assimp_stbi_set_flip_vertically_on_load
+#define stbi_set_flip_vertically_on_load_thread assimp_stbi_set_flip_vertically_on_load_thread
+#define stbi_set_unpremultiply_on_load assimp_stbi_set_unpremultiply_on_load
+#define stbi_zlib_decode_buffer assimp_stbi_zlib_decode_buffer
+#define stbi_zlib_decode_malloc assimp_stbi_zlib_decode_malloc
+#define stbi_zlib_decode_malloc_guesssize assimp_stbi_zlib_decode_malloc_guesssize
+#define stbi_zlib_decode_malloc_guesssize_headerflag assimp_stbi_zlib_decode_malloc_guesssize_headerflag
+#define stbi_zlib_decode_noheader_buffer assimp_stbi_zlib_decode_noheader_buffer
+#define stbi_zlib_decode_noheader_malloc assimp_stbi_zlib_decode_noheader_malloc
+#endif
+
 #include "stb/stb_image.h"
 
 #if _MSC_VER