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Installing OCaml on a Unix(-like) machine

PREREQUISITES

  • The GNU C Compiler (gcc) is recommended, as the bytecode interpreter takes advantage of GCC-specific features to enhance performance. gcc is the standard compiler under Linux, OS X, and many other systems.

  • If you do not have write access to /tmp, you should set the environment variable TMPDIR to the name of some other temporary directory.

  • Under HP/UX, the GNU C Compiler (gcc), the GNU Assembler (gas), and GNU Make are all required. The vendor-provided compiler, assembler and make tools have major problems.

  • Under Cygwin, the gcc-core and make packages are required. flexdll is necessary for shared library support. libX11-devel is necessary for graph library support and libintl-devel is necessary for the ocamlobjinfo tool to be able to process .cmxs files. diffutils is necessary to run the test suite.

INSTALLATION INSTRUCTIONS

  1. Configure the system. From the top directory, do:

    ./configure

    This generates the three configuration files Makefile, m.h and s.h in the config/ subdirectory.

    The configure script accepts the following options:

    -prefix <dir>

    (default: /usr/local) Set the PREFIX variable used to define the defaults of the following three options. Must be an absolute path name.

    -bindir <dir>

    (default: $(PREFIX)/bin) Directory where the binaries will be installed. Must be an absolute path name, or start with $(PREFIX).

    -libdir <dir>

    (default: $(PREFIX)/lib/ocaml) Directory where the OCaml library will be installed. Must be an absolute path name, or start with $(PREFIX).

    -mandir <dir>

    (default: $(PREFIX)/man/man1) Directory where the manual pages will be installed. Must be an absolute path name, or start with $(PREFIX).

    -cc <C compiler and options>

    (default: gcc if found, otherwise cc) C compiler to use for building the system.

    -libs <extra libraries>

    (default: none) Extra libraries to link with the system.

    -no-curses

    Do not use the curses library.

    -host <hosttype>

    (default: determined automatically) The type of the host machine, in GNU’s "configuration name" format (CPU-COMPANY-SYSTEM or CPU-COMPANY-KERNEL-SYSTEM). This info is generally determined automatically by the configure script, and rarely ever needs to be provided by hand. The installation instructions for GCC or GNU Emacs contain a complete list of configuration names.

    -target <targettype>

    (default: same as -host) The type of the target machine, in GNU’s "configuration name" format (CPU-COMPANY-SYSTEM or CPU-COMPANY-KERNEL-SYSTEM). Setting this will setup OCaml as a cross-compiler which runs on $host and produces code for $target. This requires a C toolchain which also produces code for $target and a native OCaml compiler of the exact same version (if you want a cross 4.00.1, you need a native 4.00.1).

    -x11include <include_dir>

    (default: determined automatically)

    -x11lib <lib_dir>

    (default: determined automatically) Location of the X11 include directory (e.g. /usr/X11R6/include) and the X11 library directory (e.g. /usr/X11R6/lib).

    -no-pthread

    Do not attempt to use POSIX threads.

    -with-pthread

    Attempt to use POSIX threads (this is the default).

    -no-shared-libs

    Do not configure support for shared libraries.

    -dldefs <cpp flags>
    -dllibs <flags and libraries>

    These options specify where to find the libraries for dynamic linking (i.e. use of shared libraries). -dldefs specifies options for finding the header files, and -dllibs for finding the C libraries.

    -as <assembler and options>

    (default: determined automatically) The assembler to use for assembling ocamlopt-generated code.

    -aspp <assembler and options>

    (default: determined automatically) The assembler to use for assembling the parts of the run-time system manually written in assembly language. This assembler must pre-process its input with the C preprocessor.

    -with-debug-runtime

    Compile and install the debug version of the runtimes, useful for debugging C stubs and other low-level code.

    -with-instrumented-runtime

    Compile and install the instrumented version of the runtimes, useful mainly for fine-tuning the GC. Works only on Linux.

    -verbose

    Verbose output of the configuration tests. Use it if the outcome of configure is not what you were expecting.

    -no-debugger

    Do not build ocamldebug.

    -no-native-compiler

    Do not build the native compiler — bytecode compilation only.

    -no-ocamldoc

    Do not build ocamldoc.

    -no-ocamlbuild

    Deprecated since 4.03.0, as ocamlbuild is now distributed separately from the compiler distribution.

    -no-graph

    Do not compile the Graphics library.

    -partialld <linker and options>

    (default: determined automatically) The linker and options to use for producing an object file (rather than an executable) from several other object files.

    -no-cfi

    Do not compile support for CFI directives.

    Examples:

    • Standard installation in /usr/{bin,lib,man} instead of /usr/local: ./configure -prefix /usr

    • Installation in /usr, man pages in section "l":

      ./configure -bindir /usr/bin -libdir /usr/lib/ocaml -mandir /usr/man/manl

      or:

      ./configure -prefix /usr -mandir '$(PREFIX)/man/manl'

    • On a Linux x86-64 host, to build a 32-bit version of OCaml:

      ./configure -cc "gcc -m32" -as "as --32" -aspp "gcc -m32 -c" \
            -host i386-linux -partialld "ld -r -melf_i386"

    • On a Linux x86-64 host, to build the run-time system in PIC mode, no special options should be required — the libraries should be built automatically. The old instructions were:

      ./configure -cc "gcc -fPIC" -aspp "gcc -c -fPIC"

      On a 64-bit POWER architecture host running Linux, OCaml only operates in a 32-bit environment. If your system compiler is configured as 32-bit, e.g. Red Hat 5.9, you don’t need to do anything special. If that is not the case (e.g. Red Hat 6.4), then IBM’s "Advance Toolchain" can be used. For example:

      export PATH=/opt/at7.0/bin:$PATH
./configure -cc "gcc -m32" -as "as -a32" -aspp "gcc -m32 -c" \
  -partialld "ld -r -m elf32ppc"

    • On a OS X 10.5/Intel Core 2 or OS X 10.5/PowerPC host, to build a 64-bit version of OCaml:

      ./configure -cc "gcc -m64"

    • On OS X Intel, to build a 32-bit version of OCaml:

      ./configure -host "i386-apple-darwin13.2.0" -cc "gcc -arch i386 -m32" \
  -as "as -arch i386" -aspp "gcc -arch i386 -m32 -c"

    • For Sun Solaris with the acc compiler:

      ./configure -cc "acc -fast" -libs "-lucb"

    • For Sun Solaris on Sparc 64bit, to compile natively (32bit only)

      ./configure -cc "gcc -m32" -as "as -32" -aspp "gcc -m32 -c"

    • For AIX 4.3 with the IBM compiler xlc:

      ./configure -cc "xlc_r -D_AIX43 -Wl,-bexpall,-brtl -qmaxmem=8192"

      If something goes wrong during the automatic configuration, or if the generated files cause errors later on, then look at the template files:

      config/Makefile-templ
config/m-templ.h
config/s-templ.h

      for guidance on how to edit the generated files by hand.

  2. From the top directory, do:

    make world

    This builds the OCaml bytecode compiler for the first time. This phase is fairly verbose; consider redirecting the output to a file:

    make world > log.world 2>&1     # in sh
make world >& log.world         # in csh

  3. (Optional) To be sure everything works well, you can try to bootstrap the system — that is, to recompile all OCaml sources with the newly created compiler. From the top directory, do:

    make bootstrap

    or, better:

    make bootstrap > log.bootstrap 2>&1     # in sh
make bootstrap >& log.bootstrap         # in csh

    The make bootstrap checks that the bytecode programs compiled with the new compiler are identical to the bytecode programs compiled with the old compiler. If this is the case, you can be pretty sure the system has been correctly compiled. Otherwise, this does not necessarily mean something went wrong. The best thing to do is to try a second bootstrapping phase: just do make bootstrap again. It will either crash almost immediately, or re-re-compile everything correctly and reach the fix-point.

  4. If your platform is supported by the native-code compiler (as reported during the auto-configuration), you can now build the native-code compiler. From the top directory, do:

    make opt

    or:

    make opt > log.opt 2>&1     # in sh
make opt >& log.opt         # in csh

  5. Compile fast versions of the OCaml compilers, by compiling them with the native-code compiler (you will have only compiled them to bytecode in steps 2-4). Just do:

    make opt.opt

    Later, you can compile your programs to bytecode using ocamlc.opt instead of ocamlc, and to native-code using ocamlopt.opt instead of ocamlopt. The ".opt" compilers should run faster than the normal compilers, especially on large input files, but they may take longer to start due to increased code size. If compilation times are an issue on your programs, try the ".opt" compilers to see if they make a significant difference.

    An alternative, and faster approach to steps 2 to 5 is

    make world.opt          # to build using native-code compilers

    The result is equivalent to make world opt opt.opt, but this may fail if anything goes wrong in native-code generation.

  6. You can now install the OCaml system. This will create the following commands (in the binary directory selected during autoconfiguration):

    ocamlc

    the batch bytecode compiler

    ocamlopt

    the batch native-code compiler (if supported)

    ocamlrun

    the runtime system for the bytecode compiler

    ocamlyacc

    the parser generator

    ocamllex

    the lexer generator

    ocaml

    the interactive, toplevel-based system

    ocamlmktop

    a tool to make toplevel systems that integrate user-defined C primitives and OCaml code

    ocamldebug

    the source-level replay debugger

    ocamldep

    generator of "make" dependencies for OCaml sources

    ocamldoc

    the documentation generator

    ocamlprof

    the execution count profiler

    ocamlcp

    the bytecode compiler in profiling mode

    and also, if you built them during step 5: ocamlc.opt, ocamlopt.opt, ocamllex.opt, ocamldep.opt and ocamldoc.opt

    From the top directory, become superuser and do:

    umask 022       # make sure to give read & execute permission to all
make install

  7. Installation is complete. Time to clean up. From the toplevel directory, do:

    make clean

  8. (Optional) The emacs/ subdirectory contains Emacs-Lisp files for an OCaml editing mode and an interface for the debugger. To install these files, change to the emacs/ subdirectory and do:

    make EMACSDIR=<directory where to install the files> install

    or

    make install

    In the latter case, the destination directory defaults to the site-lisp directory of your Emacs installation.

  9. After installation, do not strip the ocamldebug and ocamlbrowser executables. These are mixed-mode executables (containing both compiled C code and OCaml bytecode) and stripping erases the bytecode! Other executables such as ocamlrun can safely be stripped.

IF SOMETHING GOES WRONG

Read the "common problems" and "machine-specific hints" section at the end of this file.

Check the files m.h and s.h in config/. Wrong endian-ness or alignment constraints in m.h will immediately crash the bytecode interpreter.

If you get a "segmentation violation" signal, check the limits on the stack size and data segment size (type limit under csh or ulimit -a under bash). Make sure the limit on the stack size is at least 4M.

Try recompiling the runtime system with optimizations turned off (change CFLAGS in byterun/Makefile and asmrun/Makefile). The runtime system contains some complex, atypical pieces of C code which can uncover bugs in optimizing compilers. Alternatively, try another C compiler (e.g. gcc instead of the vendor-supplied cc).

You can also build a debug version of the runtime system. Go to the byterun/ directory and do make ocamlrund. Then, copy ocamlrund to ../boot/ocamlrun, and try again. This version of the runtime system contains lots of assertions and sanity checks that could help you pinpoint the problem.

COMMON PROBLEMS

  • The Makefiles use the include directive, which is not supported by all versions of make. Use GNU Make if this is a problem.

  • Solaris make mishandles a space in our Makefiles, so you have to use GNU make to build on Solaris.

  • The Makefiles assume that make executes commands by calling /bin/sh. They won’t work if /bin/csh is called instead. You may have to unset the SHELL environment variable, or set it to /bin/sh.

  • On some systems, localization causes build problems. You should try to set the C locale (export LC_ALL=C) before compiling if you have strange errors while compiling OCaml.

  • GCC 2.7.2.1 generates incorrect code for the runtime system in -O mode on some Intel x86 platforms (e.g. Linux RedHat 4.1 and 4.2). If this causes a problem, the solution is to upgrade to 2.7.2.3 or above.

  • Some versions of GCC 2.96 for the Intel x86 (as found in RedHat 7.2, Mandrake 8.0 and Mandrake 8.1) generate incorrect code for the runtime system. The configure script tries to work around this problem.

  • On HP 9000/700 machines under HP/UX 9, some versions of cc are unable to compile correctly the runtime system (wrong code is generated for (x - y) where x is a pointer and y an integer). Fix: use gcc.

  • Under OS X 10.6, with XCode 4.0.2, the configure script mistakenly detects support for CFI directives in the assembler. Fix: give the -no-cfi option to configure.