libpng problem -- png_read_destroy

Tue Jan 2 21:45:00 GMT 2001

Two solutions:
a) link using 'gcc -static'. You must also define ZLIB_STATIC (see
/usr/doc/Cygwin/libpng-x.x.x.README).
OR 
b) DON'T define PNG_STATIC. 
--Chuck
"Jong B. Lee" wrote:
>> Happy New Year !!
>> I'm writing a program using png library.
>> But, gcc complains that png_read_destroy and png_write_destroy are undefined.
>> How can I fix it?
>> I have the latest and clean cygwin installed.
>> Here's a sample c file and link error :
>> ------------------------------------
> /* sample png.c */
> #include <png.h>
>> int main()
> {
> #ifdef __CYGWIN__
> #define PNG_STATIC
> #endif
>> png_structp pp;
> png_infop info;
> png_read_end(pp, info);
> png_read_destroy(pp, info, NULL);
> png_write_destroy (pp);
>> return 0;
> }
> -------------------------------------
> $ gcc -W -g png.c -lpng -o png
>> /c/WINDOWS/TEMP/ccFXASfF.o(.text+0x30): undefined reference to `png_read_destroy'
> /c/WINDOWS/TEMP/ccFXASfF.o(.text+0x3f): undefined reference to `png_write_destroy'
> collect2: ld returned 1 exit status
> ===============================

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