Which ld version did you use?
`ld -v`

bash-3.00# ld -V
ld: Software Generation Utilities - Solaris Link Editors: 5.10-1.482

php5.2-200608141230 from snap.php.net fails in the same way.

Thanks for looking at this.
Terry

Please install and use GNU ld.

Sadly, make failed again.

PATH='/opt/local/gcc/bin:/opt/local/php5/bin:/opt/local/perl/bin:/opt/local/mysql/mysql/bin:/usr/bin:/usr/sbin:/usr/ccs/bin:/usr/local/bin:/usr/bin/nsr:/usr/sbin/nsr:/usr/openwin/bin:/opt/csw/bin:/usr/sfw/bin:/usr/bin'
CFLAGS='-O3 -fPIC -L/opt/csw/lib' \
CPPFLAGS='-I/opt/csw/include -I/usr/include' \
LDFLAGS='-Wl,-rpath-link=/lib:/usr/lib:/opt/csw/lib:/opt/local/mysql/mysql/lib:/opt/local/mysql/mysql:/usr/sfw/lib:/opt/local/oracle/10103_client:/opt/local/oracle/10103_client/lib'

export CFLAGS CPPFLAGS LDFLAGS PATH


'./configure' \
'--prefix=/opt/local/php5' \
'--with-apxs2=/opt/local/apache/bin/apxs' \
'--enable-safe-mode' \
'--with-exec-dir=/opt/local/php5/bin' \
'--enable-bcmath' \
'--enable-gd-native-ttf' \
'--enable-soap' \
'--enable-sockets' \
'--disable-rpath' \
'--enable-ftp' \
'--with-gd' \
'--with-gettext' \
'--with-imap=/src/Web/IMap/imap-2004g' \
'--with-imap-ssl=/src/Web/IMap/imap-2004g' \
'--with-jpeg-dir=/usr/lib/amd64/' \
'--with-ldap=/usr' \
'--with-mcrypt=/opt/local' \
'--with-png-dir=/usr/lib/amd64/' \
'--with-pspell=/usr' \
'--with-openssl=/opt/csw' \
'--with-zlib' \
'--with-libxml-dir=/opt/csw' \
'--with-mysql=/opt/local/mysql/mysql' \
'--with-oci8=/opt/local/oracle/10103_client' \
'--with-xpm-dir=/usr/lib' \
'--enable-memory-limit' \
'--with-gdbm=/opt/csw' \
'--with-db4=/opt/csw/bdb4' \
'--with-mhash=/opt/local/mhash' \
'--with-curl=/opt/local/curl' \
'--with-pear=/opt/local/php5' \
'--enable-pdo=shared' \
'--with-pdo-sqlite=shared' \
'--with-sqlite=shared' \
'--with-mbstring' \
'--with-mysqli=/opt/local/mysql/mysql/bin/mysql_config' \
'--with-pdo-mysql=shared,/opt/local/mysql/mysql' \
'--with-gnu-ld' \
'--with-ld=/usr/sfw/i386-sun-solaris2.10/bin/ld'

with;
gcc: ext/pdo_mysql/.libs/pdo_mysql.o: No such file or directory
gcc: ext/pdo_mysql/.libs/mysql_driver.o: No such file or directory
gcc: ext/pdo_mysql/.libs/mysql_statement.o: No such file or directory
gmake: *** [ext/pdo_mysql/pdo_mysql.la] Error 1

Are you sure the ld binary used for the build is GNU ?

Here is the relevant output from the configure script;
Configuring libtool
checking build system type... i386-pc-solaris2.10
checking for ld used by gcc... (cached) /usr/sfw/i386-sun-solaris2.10/bin/ld
checking if the linker (/usr/sfw/i386-sun-solaris2.10/bin/ld) is GNU ld... (cached) yes
checking for /usr/sfw/i386-sun-solaris2.10/bin/ld option to reload object files... (cached) -r
checking for BSD-compatible nm... (cached) /usr/ccs/bin/nm -p
checking how to recognise dependent libraries... (cached) pass_all
checking for object suffix... (cached) o
checking for executable suffix... (cached) no
checking the maximum length of command line arguments... (cached) 262144
checking command to parse /usr/ccs/bin/nm -p output from gcc object... (cached) ok
checking for objdir... (cached) .libs
checking for ar... (cached) ar
checking for ranlib... (cached) ranlib
checking for strip... (cached) strip
checking if gcc static flag  works... yes
checking if gcc supports -fno-rtti -fno-exceptions... (cached) no
checking for gcc option to produce PIC... -fPIC
checking if gcc PIC flag -fPIC works... yes
checking if gcc supports -c -o file.o... (cached) yes
checking whether the gcc linker (/usr/sfw/i386-sun-solaris2.10/bin/ld) supports shared libraries... yes
checking whether -lc should be explicitly linked in... yes
checking dynamic linker characteristics... solaris2.10 ld.so
checking how to hardcode library paths into programs... immediate
checking whether stripping libraries is possible... no
checking if libtool supports shared libraries... yes
checking whether to build shared libraries... yes
checking whether to build static libraries... no

creating libtool
appending configuration tag "CXX" to libtool

I will put it in the path and have another go.
Terry

Ok, I see.
Give me some time, I'll try to figure out what's wrong there (building PHP on Solaris takes hours, *sigh*..) 

This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
Thank you for the report, and for helping us make PHP better.

Hi Tony,
Thank you very much for this fix.  I really appreciate it.  I compiled Stable (5.2.x-dev) without problems.  Is it possible to compile 5.1.4 without pdo mysql and then compile PDO_MYSQL from the 5.2dev using pecl and add it in?  Or is the 5.2dev not compatiable with 5.1.4? Or is there a fixed 5.1.x somewhere that I am not aware of?  I have a few problems with the Zend Platform stuff not compatible with 5.2dev.

Thanks again.
Terry

Working!!!
Ok... I'll summarize to help out others suffering from solaris. Dont compile with the pdo_mysql stuff.

PATH='/usr/sfw/i386-sun-solaris2.10/bin:/opt/local/gcc/bin:/opt/local/php5/bin:/opt/local/perl/bin:/opt/local/mysql/mysql/bin:/usr/bin:/usr/sbin:/usr/ccs/bin:/usr/local/bin:/usr/bin/nsr:/usr/sbin/nsr:/usr/openwin/bin:/opt/csw/bin:/usr/sfw/bin:/usr/bin'
CFLAGS='-O3 -fPIC -L/opt/csw/lib' \
CPPFLAGS='-I/opt/csw/include -I/usr/include' \
LDFLAGS='-Wl,-rpath-link=/lib:/usr/lib:/opt/csw/lib:/opt/local/mysql/mysql/lib:/opt/local/mysql/mysql:/usr/sfw/lib:/opt/local/oracle/10103_client:/opt/local/oracle/10103_client/lib'
export CFLAGS CPPFLAGS LDFLAGS PATH
'./configure' \
'--prefix=/opt/local/php5' \
'--with-apxs2=/opt/local/apache/bin/apxs' \
'--enable-safe-mode' \
'--with-exec-dir=/opt/local/php5/bin' \
'--enable-bcmath' \
'--enable-gd-native-ttf' \
'--enable-soap' \
'--enable-sockets' \
'--disable-rpath' \
'--enable-ftp' \
'--with-gd' \
'--with-gettext' \
'--with-imap=/src/Web/IMap/imap-2004g' \
'--with-imap-ssl=/src/Web/IMap/imap-2004g' \
'--with-jpeg-dir=/usr/lib/amd64/' \
'--with-ldap=/usr' \
'--with-mcrypt=/opt/local' \
'--with-png-dir=/usr/lib/amd64/' \
'--with-pspell=/usr' \
'--with-openssl=/opt/csw' \
'--with-zlib' \
'--with-libxml-dir=/opt/csw' \
'--with-mysql=/opt/local/mysql/mysql' \
'--with-oci8=/opt/local/oracle/10103_client' \
'--with-xpm-dir=/usr/lib' \
'--enable-memory-limit' \
'--with-gdbm=/opt/csw' \
'--with-db4=/opt/csw/bdb4' \
'--with-mhash=/opt/local/mhash' \
'--with-curl=/opt/local/curl' \
'--with-pear=/opt/local/php5' \
'--enable-pdo=shared' \
'--with-pdo-sqlite=shared' \
'--with-sqlite=shared' \
'--with-mbstring' \
'--with-mysqli=/opt/local/mysql/mysql/bin/mysql_config' \
'--with-ld=/usr/sfw/i386-sun-solaris2.10/bin/ld' \
'--with-gnu-ld' \

Download the fixed php snapshot. Unpack, and browse to the ext/pdo_mysql. You need to phpize but make sure that phpize sets the API version matching that of your php version.  Then run 
PHP_PDO_SHARED=1 ./configure --with-pdo-mysql=/opt/local/mysql/mysql because there is a bug in the configure script that doesn't set PHP_PDO_SHARED then run gmake, cp the pdo_mysql.so to your php ext dir and add the so to php.ini.

Thanks a lot Tony.