Please I need help when I try to compile my .C to png
gcc --std=c99 -Wall -lz a.c -o a.png
c:/mingw/bin/../lib/gcc/mingw32/4.8.1/../../../../mingw32/bin/ld.exe: cannot find -lz
collect2.exe: error: ld returned 1 exit status
What does this mean?
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Jonathan Leffler
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user3695946
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Do you have a `zip` library installed on your machine? – nonsensickle Jul 14 '14 at 01:32
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1No, or I am going to place him(it) in Windows with mingw – user3695946 Jul 14 '14 at 01:35
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1Read what the `-l` option does in `gcc`: https://gcc.gnu.org/onlinedocs/gcc/Link-Options.html#Link-Options. It's telling you that it can't find that library. You need to have it installed where your compiler will look for it and that depends on your setup. – nonsensickle Jul 14 '14 at 01:47
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1Also, in [this SO answer](http://stackoverflow.com/a/6658194/1667513) it mentions that **collect2.exe** is being used to simply invoke the linker. – nonsensickle Jul 14 '14 at 01:53
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`gcc --std=c99 -Wall -L/lib -lz a.c -o a.png` – Adam Burry Jul 14 '14 at 01:54
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gcc --std=c99 -Wall -L/lib -lz a.c -o a.png doesn't work – user3695946 Jul 14 '14 at 02:48
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I was always taught that the library selection(s) '-lz' had to be last, so they can resolve external references produced by the user code 'a.c' – user3629249 Jul 14 '14 at 05:24
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5Compile C code to png? What does it even mean? Anyway, you don't have zlib, that's what linker saying. Install it with e.g. `mingw-get install zlib`. – keltar Jul 14 '14 at 10:07
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Why `-o a.png`? – polkovnikov.ph Jun 26 '17 at 11:50
1 Answers
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From the error message, the linker says that it can not find libz.so or libz.a.
If you are providing that lib from your own path,
tell the linker that it has to search in your path, by
gcc --std=c99 -Wall -Ldir -lz a.c -o a.png
use
ld -lz --verbose
to see where linker has searched for libz.
Jonathan Leffler
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