debian sid compile warnings

[osevan]

n function 'UnpackWPG2Raster',
inlined from 'ReadWPGImage' at coders/wpg.c:1514:25:
coders/wpg.c:679:32: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
679 | SampleBuffer[i]=(unsigned char) ReadBlobByte(image);
| ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
coders/wpg.c: In function 'ReadWPGImage':
coders/wpg.c:586:5: note: at offset 8 into destination object 'SampleBuffer' of size 8
586 | SampleBuffer[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
| ^~~~~~~~~~~~
CC coders/MagickCore_libMagickCore_7_Q16HDRI_la-xc.l

gcc version 15.2.0 (Debian 15.2.0-8)
debian sid

[osevan]

gcc version 15.2.0 (Debian 15.2.0-12)

In function 'GetMatrixElement',
inlined from 'RadonProjection' at MagickCore/shear.c:248:15:
MagickCore/matrix.c:544:14: warning: 'memcpy' writing 8 bytes into a region of size 2 overflows the destination [-Wstringop-overflow=]
544 | (void) memcpy(value,(unsigned char ) matrix_info->elements+i
| ^
MagickCore/shear.c: In function 'RadonProjection':
MagickCore/shear.c:241:9: note: destination object 'element' of size 2
241 | element,
| ^
In function 'GetMatrixElement',
inlined from 'RadonProjection' at MagickCore/shear.c:250:15:
MagickCore/matrix.c:544:14: warning: 'memcpy' writing 8 bytes into a region of size 2 overflows the destination [-Wstringop-overflow=]
544 | (void) memcpy(value,(unsigned char ) matrix_info->elements+i
| ^
MagickCore/shear.c: In function 'RadonProjection':
MagickCore/shear.c:242:9: note: destination object 'neighbor' of size 2
242 | neighbor;
| ^
In function 'GetMatrixElement',
inlined from 'RadonProjection' at MagickCore/shear.c:255:15:
MagickCore/matrix.c:544:14: warning: 'memcpy' writing 8 bytes into a region of size 2 overflows the destination [-Wstringop-overflow=]
544 | (void) memcpy(value,(unsigned char ) matrix_info->elements+i
| ^
MagickCore/shear.c: In function 'RadonProjection':
MagickCore/shear.c:242:9: note: destination object 'neighbor' of size 2
242 | neighbor;
| ^
coders/wpg.c: In function 'UnpackWPG2Raster':
coders/wpg.c:679:32: warning: writing 1 byte into a region of size 0 [-Wstringop-overflow=]
679 | SampleBuffer[i]=(unsigned char) ReadBlobByte(image);
| ^
coders/wpg.c:586:5: note: at offset 8 into destination object 'SampleBuffer' of size 8
586 | SampleBuffer[] = { 0, 0, 0, 0, 0, 0, 0, 0 };
| ^

[Danack]

These smell like spurious warnings. PHP itself has quite a few similar ones.

I'd suggest checking if Valgrind reports any errors, and then suggest really peering at what the code is doing.