ROHC library build emits warnings on x86-64

[Didier Barvaux]

On a x86-64 system, building the ROHC library (trunk version) emits several warnings about wrong conversion specifications for variables of type size_t. Indeed %zd should be used instead of %d or %u for size_t variables.

Steps to reproduce:
1. Retrieve trunk sources
2. ./autogen.sh --enable-fail-on-warning --enable-rohc-debug --enable-rohc-tests
3. make clean all check

With the --enable-fail-on-warning flag, the build fails on all warnings.

[Audric Schiltknecht (audric-schiltknecht)]

%zu may be used if C99 is used to compile ROHC. (length modifier 'z' was added in C99, cf http://en.wikipedia.org/wiki/C99 or http://www.open-std.org/jtc1/sc22/WG14/www/docs/n1256.pdf page 352).

If compatibility with C90 is required, using '%lu', and casting any 'size_t' variables to 'unsigned long' is sufficient.

Provided patch uses '%lu' formater, compiles and passes tests successfully on both 32 and 64 bits plateforms (with GCC 4.6)

[Didier Barvaux (didier-barvaux)]

Branch 1.3.x is not affected.

[Didier Barvaux (didier-barvaux)]

Branch 1.2.x is not affected.

[Didier Barvaux (didier-barvaux)]

The C99 standard is already required because of variadic macros. So, sorry Audric, I prefer using the %zd modifier.

Format strings modified all around in the trunk to fix the x68_64 build.
See http://bazaar.launchpad.net/~didier-barvaux/rohc/main/revision/256 for details.