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otool(1) [osx man page]

OTOOL(1)						      General Commands Manual							  OTOOL(1)

NAME
otool - object file displaying tool SYNOPSIS
otool [ option ... ] [ file ... ] DESCRIPTION
The otool command displays specified parts of object files or libraries. If the, -m option is not used, the file arguments may be of the form libx.a(foo.o), to request information about only that object file and not the entire library. (Typically this argument must be quoted, ``libx.a(foo.o)'', to get it past the shell.) Otool understands both Mach-O (Mach object) files and universal file formats. Otool can display the specified information in either its raw (numeric) form (without the -v flag), or in a symbolic form using macro names of constants, etc. (with the -v or -V flag). At least one of the following options must be specified: -a Display the archive header, if the file is an archive. -S Display the contents of the `__.SYMDEF' file, if the file is an archive. -f Display the universal headers. -h Display the Mach header. -l Display the load commands. -L Display the names and version numbers of the shared libraries that the object file uses. -D Display just install name of a shared library. -s segname sectname Display the contents of the section (segname,sectname). If the -v flag is specified, the section is displayed as its type, unless the type is zero (the section header flags). Also the sections (__OBJC,__protocol), (__OBJC,__string_object) and (__OBJC,__run- time_setup) are displayed symbolically if the -v flag is specified. -t Display the contents of the (__TEXT,__text) section. With the -v flag, this disassembles the text. And with -V, it also symboli- cally disassembles the operands. -d Display the contents of the (__DATA,__data) section. -o Display the contents of the __OBJC segment used by the Objective-C run-time system. -r Display the relocation entries. -c Display the argument strings (argv[] and envp[]) from a core file. -I Display the indirect symbol table. -T Display the table of contents for a dynamically linked shared library. -R Display the reference table of a dynamically linked shared library. -M Display the module table of a dynamically linked shared library. -H Display the two-level namespace hints table. The following options may also be given: -p name Used with the -t and -v or -V options to start the disassembly from symbol name and continue to the end of the (__TEXT,__text) sec- tion. -v Display verbosely (symbolically) when possible. -V Display the disassembled operands symbolically (this implies the -v option). This is useful with the -t option. -X Don't display leading addresses when displaying contents of sections. -arch arch_type Specifies the architecture, arch_type, of the file for otool(1) to operate on when the file is a universal file. (See arch(3) for the currently know arch_types.) The arch_type can be "all" to operate on all architectures in the file. The default is to display only the host architecture, if the file contains it; otherwise, all architectures in the file are shown. -m The object file names are not assumed to be in the archive(member) syntax, which allows file names containing parenthesis. Apple Computer, Inc. July 28, 2005 OTOOL(1)

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LIBTOOL(1)						      General Commands Manual							LIBTOOL(1)

NAME
libtool - create libraries ranlib - add or update the table of contents of archive libraries SYNOPSIS
libtool -static -o output [ -sacLT ] [ - ] [ -arch_only arch_type ] file... [-filelist listfile[,dirname]] libtool -dynamic -o output [ -install_name name ] [ -compatibility_version number ] [ -current_version number ] [ link editor flags ] [ -v ] [ -noall_load ] [ - ] [ -arch_only arch_type ] [ -V ] file... [-filelist listfile[,dirname]] ranlib [ -sactfqLT ] [ - ] archive... DESCRIPTION
The libtool command takes the specified input object files and creates a library for use with the link editor, ld(1). The library's name is specified by output (the argument to the -o flag). The input object files may be in any correct format that contains object files (``universal'' files, archives, object files). Libtool will not put any non-object input file into the output library (unlike ranlib, which allows this in the archives it operates on). When producing a ``universal'' file from objects of the same CPU type and differing CPU subtypes, libtool and ranlib create at most one library for each CPU type, rather than a separate library in a universal file for each of the unique pairings of CPU type and CPU subtype. Thus, the resulting CPU subtype for each library is the _ALL CPU subtype for that CPU type. This strategy strongly encourages the imple- mentor of a library to create one library that chooses optimum code to run at run time, rather than at link time. Libtool can create either dynamically linked shared libraries, with -dynamic, or statically linked (archive) libraries, with -static. DYNAMICALLY LINKED SHARED LIBRARIES
Dynamically linked libraries, unlike statically linked libraries, are Mach-O format files and not ar(5) format files. Dynamically linked libraries have two restrictions: No symbol may be defined in more than one object file and no common symbol can be used. To maximize shar- ing of a dynamically linked shared library the objects should be compiled with the -dynamic flag of cc(1) to produce indirect undefined references and position-independent code. To build a dynamically linked library, libtool, runs the link editor, ld(1), with -dylib once for each architecture present in the input objects and then lipo(1) to create a universal file if needed. ARCHIVE (or statically linked) LIBRARIES Libtool with -static is intended to replace ar(5) and ranlib. For backward compatibility, ranlib is still available, and it supports uni- versal files. Ranlib adds or updates the table of contents to each archive so it can be linked by the link editor, ld(1). The table of contents is an archive member at the beginning of the archive that indicates which symbols are defined in which library members. Because ranlib rewrites the archive, sufficient temporary file space must be available in the file system that contains the current directory. Ranlib takes all correct forms of libraries (universal files containing archives, and simple archives) and updates the table of contents for all archives in the file. Ranlib also takes one common incorrect form of archive, an archive whose members are universal object files, adding or updating the table of contents and producing the library in correct form (a universal file containing multiple archives). The archive member name for a table of contents begins with ``__.SYMDEF''. Currently, there are two types of table of contents produced by libtool -static and ranlib and understood by the link editor, ld(1). These are explained below, under the -s and -a options. OPTIONS
The following options pertain to libtool only. -static Produce a statically linked (archive) library from the input files. This is the default. -dynamic Produce a dynamically linked shared library from the input files. -install_name name For a dynamic shared library, this specifies the file name the library will be installed in for programs that use it. If this is not specified the name specified by the -o output option will be used. -compatibility_version number For a dynamic shared library, this specifies the compatibility version number of the library. When a library is used the compati- bility version is checked and if the user's version is greater that the library's version, an error message is printed and the using program exits. The format of number is X[.Y[.Z]] where X must be a positive non-zero number less than or equal to 65535, and .Y and .Z are optional and if present must be non-negative numbers less than or equal to 255. If this is not specified then it has a value of 0 and no checking is done when the library is used. -current_version number For dynamic shared library files this specifies the current version number of the library. The program using the library can obtain the current version of the library programmatically to determine exactly which version of the library it is using. The format of number is X[.Y[.Z]] where X must be a positive non-zero number less than or equal to 65535, and .Y and .Z are optional and if present must be non-negative numbers less than or equal to 255. If this is not specified then it has a value of 0. -noall_load For dynamic shared library files this specifies the the default behavior of loading all members of archives on the command line is not to be done. This option is used by the GNU compiler driver, cc(1), when used with it's -dynamiclib option. This is done to allow selective loading of the GNU's compiler's runtime support library, libcc_dynamic.a . link editor flags For a dynamic shared library the following ld(1) flags are accepted and passed through: -lx, -weak-lx, -search_paths_first -weak_library, -Ldir, -ysym, -usym, -initsym, -idefinition:indirect, -seg1addr, -segs_read_only_addr, -segs_read_write_addr, -seg_addr_table, -seg_addr_table_filename, -segprot, -segalign, -sectcreate, -sectorder, -sectorder_detail, -sectalign, -undefined, -read_only_relocs, -prebind, -prebind_all_twolevel_modules, -prebind_allow_overlap, -noprebind, -framework, -weak_framework, -umbrella, -allowable_client, -sub_umbrella, -sub_library, -F, -U, -Y, -Sn, -Si, -Sp, -S, -X, -x, -whyload, -all_load. -arch_errors_fatal, -dylib_file, -run_init_lazily, -final_output, -macosx_version_min, -multiply_defined, -multiply_defined_unused, -twolevel_namespace, -twolevel_namespace_hints, -flat_namespace, -nomultidefs, -headerpad, -headerpad_max_install_names, -weak_ref- erence_mismatches, -M, -t, -no_arch_warnings, -single_module, -multi_module, -exported_symbols_list, -unexported_symbols_list, -m, -dead_strip, -no_dead_strip_inits_and_terms, -executable_path, -syslibroot, -no_uuid. See the ld(1) man page for details on these flags. The flag -image_base is a synonym for -seg1addr. -v Verbose mode, which prints the ld(1) commands and lipo(1) commands executed. -V Print the version of libtool. -filelist listfile[,dirname] The listfile contains a list of file names and is an alternative way of specifiying file names on the command line. The file names are listed one per line separated only by newlines (spaces and tabs are assumed to be part of the file name). If the optional directory name, dirname is specified then it is prepended to each name in the list file. -arch_only arch_type This option causes libtool to build a library only for the specified arch_type and ignores all other architectures in the input files. When building a dynamic library, if this is specified with a specific cpusubtype other than the family cpusubtype then libtool it does not use the ld(1) -force_cpusubtype_ALL flag and passes the -arch_only argument to ld(1) as the -arch flag so that the output is tagged with that cpusubtype. The following options pertain to the table of contents for an archive library, and apply to both libtool -static and ranlib: -s Produce the preferred type of table of contents, which results in faster link editing when linking with the archive. The order of the table of contents is sorted by symbol name. The library member name of this type of table of contents is ``__.SYMDEF SORTED''. This type of table of contents can only be produced when the library does not have multiple members that define the same symbol. This is the default. -a Produce the original type of table of contents, whose order is based on the order of the members in the archive. The library member name of this type of table of contents is ``__.SYMDEF''. This type of table of contents must be used when the library has multiple members that define the same symbol. -c Include common symbols as definitions with respect to the table of contents. This is seldom the intended behavior for linking from a library, as it forces the linking of a library member just because it uses an uninitialized global that is undefined at that point in the linking. This option is included only because this was the original behavior of ranlib. This option is not the default. -L Use the 4.4bsd archive extended format #1, which allows archive member names to be longer than 16 characters and have spaces in their names. This option is the default. -T Truncate archive member names to 16 characters and don't use the 4.4bsd extended format #1. This option is not the default. -f Warns when the output archive is universal and ar(1) will no longer be able to operate on it. -q Do nothing if a universal file would be created. For compatibility, the following ranlib option is accepted (but ignored): -t This option used to request that ranlib only ``touch'' the archives instead of modifying them. The option is now ignored, and the table of contents is rebuilt. One other option applies to both libtool and ranlib: - Treat all remaining arguments as names of files (or archives) and not as options. SEE ALSO
ld(1), ar(1), otool(1), make(1), redo_prebinding(1), ar(5) BUGS
With the way libraries used to be created, errors were possible if the library was modified with ar(1) and the table of contents was not updated by rerunning ranlib(1). So previously the link editor, ld(1), generated an error when the modification date of a library was more recent than the creation date of its table of contents. Unfortunately, this meant that you got the error even if you only copy the library. Since this error was found to be too much of a nuisance it was removed. So now it is possible again to get link errors if the library is modified and the table of contents is not updated. Apple Inc. September 24, 2008 LIBTOOL(1)
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