From Lazarus-ccr

[edit] Status

• 2.2.x (and above) compiler support
• compiler can build itself
• snapshot is available ftp://ftp.freepascal.org/pub/fpc/dist/i386-win32-2.2.0/fpc-2.2.0.x86_64-win64.exe
• test suite results for 2.3.1 version are at 30 failures (near to Win32, 27 failures) http://www.freepascal.org/cgi-bin/testsuite.cgi?os=16&cpu=8&version=0&date=
• Lazarus/FreePascal daily snapshot is available http://www.hu.freepascal.org/lazarus/

[edit] Compiling and building

[edit] Compiling a program

Win64 requires the usage of the internal linker of FPC so all programs must be compiled with -Xi.

[edit] Debugging and Profiling

There is currently no full debugger support available, we're working on improving this situation. Basic debugging can be done so far with WinDBG http://www.microsoft.com/whdc/devtools/debugging/install64bit.mspx, the missing dwarf support of WinDBG makes things a little bit difficult though.

GDB for Win64 (beta version) is already available at http://sourceforge.net/project/showfiles.php?group_id=202880&package_id=259447

[edit] Todo

• add compiler target
• adapt rtl units
• adapt api units
• adapt fcl
• get lazarus working
• get integrated debugger working

[edit] Technical information

We're using our own assembler and linker to overcome the problem of the missing GNU Tools.

Information about the API etc. can be found at Win64/AMD64 API