zip doesn't compile on 32b system with GCC 9.2.0

[russkel]

Trying to compile assimp for Alpine Linux on 32bit platforms and there seems to be an issue with ssize_t decleration:

[ 62%] Building CXX object code/CMakeFiles/assimp.dir/__/contrib/poly2tri/poly2tri/sweep/cdt.cc.o
In file included from /home/buildozer/aports/testing/assimp/src/assimp-5.0.0/code/3MF/D3MFExporter.cpp:61:
/home/buildozer/aports/testing/assimp/src/assimp-5.0.0/contrib/zip/src/zip.h:30:15: error: conflicting declaration 'typedef long int ssize_t'
   30 | typedef long  ssize_t;  /* byte count or error */
      |               ^~~~~~~
In file included from /usr/include/stdio.h:26,
                 from /usr/include/fortify/stdio.h:22,
                 from /usr/include/c++/9.2.0/cstdio:42,
                 from /usr/include/c++/9.2.0/ext/string_conversions.h:43,
                 from /usr/include/c++/9.2.0/bits/basic_string.h:6493,
                 from /usr/include/c++/9.2.0/string:55,
                 from /usr/include/c++/9.2.0/stdexcept:39,
                 from /usr/include/c++/9.2.0/array:39,
                 from /usr/include/c++/9.2.0/tuple:39,
                 from /usr/include/c++/9.2.0/bits/unique_ptr.h:37,
                 from /usr/include/c++/9.2.0/memory:80,
                 from /home/buildozer/aports/testing/assimp/src/assimp-5.0.0/code/3MF/D3MFExporter.h:44,
                 from /home/buildozer/aports/testing/assimp/src/assimp-5.0.0/code/3MF/D3MFExporter.cpp:45:
/usr/include/bits/alltypes.h:151:15: note: previous declaration as 'typedef int ssize_t'
  151 | typedef _Addr ssize_t;
      |               ^~~~~~~

CI output might be of interest: https://cloud.drone.io/alpinelinux/aports/13069 and AL PR alpinelinux/aports#11998

I posted this to assimp/assimp#2733 as well.

[russkel]

Is there a reason size_t is being redefined?

[kuba--]

Thanks @russkel - I'll take a look.

It was added in commit: 635ef1d

for 64-bit Windows:

// 64-bit Windows is the only mainstream platform
// where sizeof(long) != sizeof(void*)

It's not a problem with size_t but with redefined ssize_t
If we have ssize_t one of

_SSIZE_T_DEFINED
_SSIZE_T_DEFINED_
_SSIZE_T
_SSIZE_T_
__ssize_t_defined

should be defined. I'll take a look what GCC 9.X. defines.

BTW. Alpine uses musl instead of libc, so I'll have to take a look into this particular distro.

[kuba--]

Looks adding __DEFINED_ssize_t (which is what musl has) to https://github.com/kuba--/zip/blob/master/src/zip.h#L22 may solve the problem but I'll have to double check it.

[kuba--]

@russkel - I was able to compile this library on Alpine with gcc 9.2.0, without any problems.
Anyway, just in case I pushed PR: https://github.com/kuba--/zip/pull/111/files
which IMO should fix the potential issue. It just checks/defines another __DEFINED_ssize_t which is used by gcc on Alpine.
PTAL if it works for you

[kuba--]

@russkel Please feel free to reopen, if the issue still happens.
I'm gonna release a new version with the fix

[russkel]

hi @kuba-- thanks for this. I haven't had a chance to test it yet but I will later this evening and will report back! Thanks again for quick fix.

[russkel]

@kuba-- 👍 compiling fine. Thanks for the fix.

[randomMesh]

Hi,

i try to compile latest ASSIMP (which uses zip) on FreeBSD 12.1 32Bit with GCC 9.2.0 and there still is an error regarding typedef redefinition:

[ 65%] Building C object code/CMakeFiles/assimp.dir/__/contrib/zip/src/zip.c.o
In file included from /home/foo/development/libs/assimp/contrib/zip/src/zip.c:39:

/home/foo/development/libs/assimp/contrib/zip/src/zip.h:31:14: error: typedef redefinition with different types ('long' vs '__ssize_t' (aka 'int'))

typedef long ssize_t; /* byte count or error */
             ^

/usr/include/sys/types.h:206:19: note: previous definition is here
typedef __ssize_t       ssize_t;
                        ^

1 error generated.
*** Error code 1

I see that @kimkulling added your fix to the master branch last year, but this doesn't seem to work on FreeBSD. What should i do?

[kuba--]

@randomMesh - I'll take a look on define pre-proc. in freebsd library and update zip.c.
But if you have a easy access to FreeBSD, you can check /usr/include/sys/types.h file and try to fix by adding ifdef

[randomMesh]

Hi,

thanks for the quick answer. I made it compile.

I had a look at /usr/include/sys/types.h which looks like this:

#ifndef _SSIZE_T_DECLARED
typedef	__ssize_t	ssize_t;
#define	_SSIZE_T_DECLARED
#endif

So i added this to zip.h:

diff --git a/contrib/zip/src/zip.h b/contrib/zip/src/zip.h
index a48d64d6..d85306c8 100644
--- a/contrib/zip/src/zip.h
+++ b/contrib/zip/src/zip.h
@@ -21,7 +21,7 @@ extern "C" {
 
 #if !defined(_SSIZE_T_DEFINED) && !defined(_SSIZE_T_DEFINED_) &&               \
     !defined(__DEFINED_ssize_t) && !defined(__ssize_t_defined) &&              \
-    !defined(_SSIZE_T) && !defined(_SSIZE_T_)
+    !defined(_SSIZE_T) && !defined(_SSIZE_T_) && !defined(_SSIZE_T_DECLARED)
 
 // 64-bit Windows is the only mainstream platform
 // where sizeof(long) != sizeof(void*)
@@ -37,6 +37,7 @@ typedef long ssize_t; /* byte count or error */
 #define __ssize_t_defined
 #define _SSIZE_T
 #define _SSIZE_T_
+#define _SSIZE_T_DECLARED
 
 #endif
 

Thanks for the help!

[zeehead]

Hi @kuba--

so, I'm working on some code using Arduino IDE (2.0.0-rc6) and Blynk library, installed the latest esp32 board package (v 2.0.2).

And my code does compile, but still shows a red underline under the left bracket on

#include <BlynkSimpleEsp32_BT.h>

and it says this:

In included file: typedef redefinition with different types ('int' vs '_ssize_t' (aka 'long long'))clang(redefinition_different_typedef)
arch.h(202, 13): Error occurred here
types.h(184, 18): Previous definition is here

The path for types.h:

C:\Users\User\AppData\Local\Arduino15\packages\esp32\tools\xtensa-esp32-elf-gcc\gcc8_4_0-esp-2021r2\xtensa-esp32-elf\sys-include\sys\types.h

and this is the definition:

#ifndef _SSIZE_T_DECLARED
typedef _ssize_t ssize_t;
#define	_SSIZE_T_DECLARED
#endif

Path for arch.h:

C:\Users\User\AppData\Local\Arduino15\packages\esp32\hardware\esp32\2.0.2\tools\sdk\esp32\include\lwip\lwip\src\include\lwip\arch.h

and this is where the error ocurred:

#ifdef SSIZE_MAX
/* If SSIZE_MAX is defined, unistd.h should provide the type as well */
#ifndef LWIP_NO_UNISTD_H
#define LWIP_NO_UNISTD_H 0
#endif
#if !LWIP_NO_UNISTD_H
#include <unistd.h>
#endif
#else /* SSIZE_MAX */
typedef int ssize_t;
#define SSIZE_MAX INT_MAX
#endif /* SSIZE_MAX */

/* some maximum values needed in lwip code */
#define LWIP_UINT32_MAX 0xffffffff

Could you help me out here? I'm not sure what exactly I should change now in my case. Or should I just leave it, since it still compiles?

BTW, I hope I'm not posting in the wrong place here.

[kuba--]

@zeehead - size_t is tricky. On most platforms it's defined, but in a different way. But sometimes (very rarely) it's not defined at all. That's why we have the ifdef here: https://github.com/kuba--/zip/blob/master/src/zip.h#L37

Anyway, you can give me your platform name (how it's defined), so I can add it to the mentioned ifdef or you can (as a workaround):
#define _POSIX_C_SOURCE before you include zip.h.