Silent ABI break in 6.9.10-11 on i386

[rbalint]

Prerequisites

• I have written a descriptive issue title
• I have verified that I am using the latest version of ImageMagick
• I have searched open and closed issues to ensure it has not already been reported

Description

Commit 94a86b3 changed sizeof(MagickDoubleType) on i386 and made the low level ABI break for programs accessing some public structs via pointers.

Steps to Reproduce

test.c:
#include <magick/MagickCore.h>
#include <stddef.h>
int main(){
printf("%d %d\n", offsetof(DrawInfo, text), sizeof(MagickDoubleType));
return 0;
}

# compiled with 6.9.10-8
$ ./a.out
280 12

# compiled with 6.9.10-14
$ ./a.out
272 8

System Configuration

• ImageMagick version: 6.9.10-14
• Environment (Operating system, version and so on): Ubuntu 19.04 i386

[urban-warrior]

Thanks for the problem report. We can reproduce it and will have a patch to fix it in GIT master branch @ https://github.com/ImageMagick/ImageMagick later today. The patch will be available in the beta releases of ImageMagick @ https://www.imagemagick.org/download/beta/ by sometime tomorrow.