inline errors with gmp 4.2.4 (on Mac) - solution

[Joubert Nel]

Hi Wade,

I have also been struggling with the duplicate symbol ___gmp_abs  
problem for the last day. But finally found a solution.
The problem for me was not compiling GMP itself (I use Fink /  
MacPorts), but rather my inclusion of its header file (gmp.h) - same  
error message as you.

The following Build settings for my Target in XCode did the trick:
- C/C++ Compiler Version = GCC 4.2
- C Language Dialect = C99 [-std=c99]
- Other C flags: -fgnu89-inline

Alternatively, if you simply compile with C Language Dialect set to 89  
(instead of 99), that should work too.

Joubert





inline errors with gmp 4.2.4

Wade Williams wadesworld at mac.com
Tue Jan 20 16:28:33 CET 2009

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I've got one more problem with gmp for which I hope there's a solution.

I have spent long hours googling on this subject and trying the
various suggestions presented, but so far none have worked.  I also
have emailed Apple's XCode mailing list, hoping to find a solution
without bothering the gmp community, but was unsuccessful.  I also
searched through the last year of archives on this list.

When I compile gmp 4.2.4 (32-bit) on OS X 10.5.4 I get:

duplicate symbol ___gmpz_abs in /Users/wwilliam/Development/code/
project/build/Debug/libcrypt.a(crypt.o) and /Users/wwilliam/
Development/code/project/build/Debug/libcrypt.a(rsa.o)

My understanding from my searches is that this due to a bug in Apple's
inline implementation.

Defining __GMP_FORCE_mpz_abs got rid of this error, but then the same
error occurred with with __gmpz_fits_uint_p.  Defining
__GMP_FORCE_mpz_fits_uint_p did not resolve that error, leading me to
worry that I didn't truly understand the issue and changing things at
random was not a good idea.

I'm hoping this issue has been seen before and there's a simple
solution that I'm just missing.

Thanks,

Wade
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