[png-mng-implement] libpng15.a - static linking

[Rafal B. <raf...@gm...>]

I've encountered an issue whilst developing my own application based on *
libpng* (1.5 version).

Long story short, I need to static link this library but I keep
getting '*undefined
reference`* errors. I tried both extracting *libpng15.a *and adding its
content to my library as well as linking with a *gcc* command.

My *gcc *command:

> *gcc test.c librimg.a libz.a libpng15.a  -o test -std=c99 -lglfw -lGL
> -lGLU*


Errors I get:

> *libpng15.a(libpng15_la-png.o): In function `png_reset_crc':
> /home/robin/Downloads/libpng-1.5.12/png.c:111: undefined reference to
> `crc32'
> libpng15.a(libpng15_la-png.o): In function `png_calculate_crc':
> /home/robin/Downloads/libpng-1.5.12/png.c:152: undefined reference to
> `crc32'
> libpng15.a(libpng15_la-png.o): In function `png_reset_zstream':
> /home/robin/Downloads/libpng-1.5.12/png.c:757: undefined reference to
> `inflateReset'
> libpng15.a(libpng15_la-pngread.o): In function `png_create_read_struct_2':
> /home/robin/Downloads/libpng-1.5.12/pngread.c:119: undefined reference to
> `inflateInit_'
> libpng15.a(libpng15_la-pngread.o): In function `png_read_row':
> /home/robin/Downloads/libpng-1.5.12/pngread.c:557: undefined reference to
> `inflate'
> libpng15.a(libpng15_la-pngread.o): In function `png_read_destroy':
> /home/robin/Downloads/libpng-1.5.12/pngread.c:1070: undefined reference to
> `inflateEnd'
> libpng15.a(libpng15_la-pngrutil.o): In function `png_inflate':
> /home/robin/Downloads/libpng-1.5.12/pngrutil.c:333: undefined reference to
> `inflate'
> /home/robin/Downloads/libpng-1.5.12/pngrutil.c:362: undefined reference to
> `inflateReset'
> libpng15.a(libpng15_la-pngrutil.o): In function `png_read_finish_row':
> /home/robin/Downloads/libpng-1.5.12/pngrutil.c:3848: undefined reference
> to `inflate'
> /home/robin/Downloads/libpng-1.5.12/pngrutil.c:3880: undefined reference
> to `inflateReset'
> collect2: ld returned 1 exit status*

(Note: I've compiled library from source and directory *
/home/robin/Downloads/libpng-1.5.12*/ is a place where I extracted the
archive.)

It's probably worth mentioning that I can link to a shared library without
any difficulties:

> *gcc test.c librimg.a -o test -std=c99 -lpng15 -lglfw -lGL -lGLU*


I would appreciate any help.

-- 
Looking forward to a response,
Rafał Bolanowski