Question

I m trying to build cairo on Windows using MinGW (and MSYS). I am following the instrucions on Compiling GTK+ 2.16.4 for Windows, except that I m using the latest versions whenever possible, i.e:

zlib-1.2.3
libpng-1.2.42
pixman-0.17.4
cairo-1.8.8

This works pretty well up until when I try to build the actual cairo. The configuration succeeds, but during make cairo seems to have problems linking to my build of libpng. After a little while I get a long list of errors such as this:

.libs/cairo-png.o: In function `png_simple_error_callback :
/home/user/cairo-1.8.8/src/cairo-png.c:95: undefined reference to `png_get_error_ptr 
.libs/cairo-png.o: In function `png_simple_warning_callback :
/home/user/cairo-1.8.8/src/cairo-png.c:112: undefined reference to `png_get_error_ptr 

...

.libs/cairo-png.o: In function `stream_read_func :
/home/user/cairo-1.8.8/src/cairo-png.c:686: undefined reference to `png_error 
collect2: ld returned 1 exit status
make[3]: *** [libcairo.la] Error 1
make[3]: Leaving directory `/home/user/cairo-1.8.8/src 
make[2]: *** [all] Error 2
make[2]: Leaving directory `/home/user/cairo-1.8.8/src 
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/user/cairo-1.8.8 
make: *** [all] Error 2

I have tried using an older version of libpng (1.2.40, the version being distributed by The GTK+ Project), with the same result. When I run "pkg-config -cflags -libs libpng" I get "-IC:/MinGW/include/libpng12 -LC:/MinGW/lib -lpng12", which seems correct. I m sure I m making some stupid mistake, but I cannot tell what it is.

Answer 1

Apparently this is a known issue. I don t know how managed to miss it, given that it is even mentioned in the blog that I was following (I think it s safe to assume that this also applies to Windows 7, given that I tried the third suggestion and it fixed my problem):

Now, let s install MinGW. Note that MinGW doesn t run smoothly on Windows Vista because of weird filesystem restrictions. The workaround is

to install MinGW on FAT filesystem,

to work in the safe mode, or

to use MinGW Portable which is said to be working well.

Answer 2

I noticed that libpng12.dll.a was much too small (<1kb).

It is so due to incorrect symbols in libpng.vers (symbols have extra _ at beginning). After libpng build I removed extra _ and recreated libpng12.dll.a manually - size is OK now. But... The correct import library doesn t resolve your (and my) problem.

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