relaytool - Online in the Cloud

PROGRAM:

NAME

relaytool - Generate a file that can be used instead of linking directly against a library

SYNOPSIS

relaytool [OPTION ...] [LINKER COMMAND ...]

DESCRIPTION

This manual page documents briefly the relaytool command.

relaytool is a program to provide a more convenient interface to dlopen/dlsym. It lets you
write the same style of code you would when using a normal hard link (-lwhatever), but the
symbols are actually lazy-linked at runtime. You can use the symbols
libwhatever_is_present and libwhatever_symbol_is_present() to find out what APIs are
actually available at runtime.

In other words, the need to use function pointers and lots of manual calls to dlsym() is
eliminated, and it becomes much simpler to soft link to things as a result. If a symbol is
missing at runtime and you call it anyway, your application will abort and an error
message is printed that states which function was called. If a variable is missing at
runtime, the value is always -1.

OPTIONS

--relay LIB
If a matching -lLIB is found, generate a file that can be used instead of linking
directly to LIB. The name of the file is echoed on stdout. Multiple --relay can be
used together, a file will be generated for each matching ones.

--replace-all-libs
Generate a file for every -lLIB parameter.

--minimal-list OBJ_LIST
Will look in OBJ_LIST for undefined symbols, and generate a file creating only the
needed symbols for each LIB.

--partial-map MAP_FILE
Generate a file creating only the symbols contained in MAP_FILE. Will apply to all
further -lLIB parameters, so in general is not suitable to multiple libs in the same
invocation of relaytool.

--no-replace
Echo -lLIB on stdout even if a --relay LIB is found, so it'll be linked in normally.

--multilink [SONAMES...]
If a library has different SONAMES on different Linux distributions you can specify
the various SONAMES that it's known by here. Relaytool will attempt to load them (in
the order provided) until one if found. This cannot be used with multiple --relay
options. The first SONAME in the list will be used as the name in the _is_present
variable and _symbol_is_present function.

--out-dir DIRECTORY
Write stub file to DIRECTORY instead of CWD.

LINKER COMMANDS

-LPATH
Add PATH to the list of paths to search for LIBs.

-lLIB
If a matching --relay LIB is found (or if --replace-all-libs is specified), generate a
file that can be used instead of linking directly to LIB. If there's no --relay LIB,
echo -lLIB to stdout.

All other linker commands are passed as is to stdout.

OTHER COMMANDS

-h, --help
Show some help.

--version
Display version information of relaytool

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