x86_64 support requires -fPIC

[razvand]

Compiling libutp under a Linux running on a x86_64 architecture results in the error below:

g++ -Wall -ansi --shared -o libutp.so -g utp.cpp utp_utils.cpp -DPOSIX -I . -I utp_config_lib -lrt -fno-exceptions -fno-rtti
/usr/bin/ld: /tmp/ccglGf8u.o: relocation R_X86_64_32 against `.text' can not be used when making a shared object; recompile with -fPIC
/tmp/ccglGf8u.o: could not read symbols: Bad value
collect2: ld returned 1 exit status
make: *** [libutp.so] Error 1

The solution is adding -fPIC when using getting libutp.so in the root Makefile, as in the diff below:

--- makefile.old    2010-11-19 18:33:24.000000000 +0200
+++ makefile    2010-11-19 18:33:09.000000000 +0200
@@ -15 +15 @@
-   g++ -Wall -ansi --shared -o libutp.so -g $(utp) -DPOSIX -I . -I utp_config_lib $(libs) $(cflags)
+   g++ -Wall -ansi -fPIC --shared -o libutp.so -g $(utp) -DPOSIX -I . -I utp_config_lib $(libs) $(cflags)

[ghazel]

And -fPIC works on x86 (32bit) architectures as well?

[razvand]

Yes, it works. See below:

razvan@anaconda:/tmp/libutp$ make
g++ -Wall -ansi -fPIC --shared -o libutp.so -g utp.cpp utp_utils.cpp -DPOSIX -I . -I utp_config_lib -lrt -fno-exceptions -fno-rtti
razvan@anaconda:/tmp/libutp$ ls -l libutp.so 
-rwxr-xr-x 1 razvan razvan 93195 Nov 19 23:33 libutp.so
razvan@anaconda:/tmp/libutp$ file libutp.so 
libutp.so: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
razvan@anaconda:/tmp/libutp$ uname -a
Linux anaconda 2.6.26-2-686 #1 SMP Thu Aug 19 03:44:10 UTC 2010 i686 GNU/Linux