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187 lines
4.5 KiB
Plaintext
187 lines
4.5 KiB
Plaintext
=pod
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=head1 NAME
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llvm-ld - LLVM linker
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=head1 SYNOPSIS
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B<llvm-ld> <options> <files>
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=head1 DESCRIPTION
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The B<llvm-ld> command is similar to the common Unix utility, C<ld>. It
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links together bytecode modules to produce an executable program.
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=head1 OPTIONS
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=head2 Input/Output Options
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=over
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=item B<-o> F<filename>
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This overrides the default output file and specifies the name of the file that
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should be generated by the linker. By default, B<llvm-ld> generates a file named
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F<a.out> for compatibility with B<ld>. The output will be written to
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F<filename>.
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=item B<-l>F<name>
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This option specifies the F<name> of a library to search when resolving symbols
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for the program. Only the base name should be specified as F<name>, without a
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F<lib> prefix or any suffix.
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=item B<-L>F<Path>
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This option tells B<llvm-ld> to look in F<Path> to find any library subsequently
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specified with the B<-l> option. The paths will be searched in the order in
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which they are specified on the command line. If the library is still not found,
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a small set of system specific directories will also be searched. Note that
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libraries specified with the B<-l> option that occur I<before> any B<-L> options
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will not search the paths given by the B<-L> options following it.
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=item B<-link-as-library>
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Link the bytecode files together as a library, not an executable. In this mode,
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undefined symbols will be permitted.
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=item B<-r>
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An alias for -link-as-library.
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=item B<-march=>C<target>
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Specifies the kind of machine for which code or assembly should be generated.
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=item B<-native>
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Generate a native binary instead of a shell script that runs the JIT from
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bytecode.
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=item B<-native-cbe>
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Generate a native binary with the C back end and compilation with GCC.
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=item B<-disable-compression>
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Do not compress bytecode files.
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=back
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=head2 Optimization Options
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=over
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=item B<-O0>
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An alias for the -O1 option.
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=item B<-O1>
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Optimize for linking speed, not execution speed. The optimizer will attempt to
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reduce the size of the linked program to reduce I/O but will not otherwise
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perform any link-time optimizations.
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=item B<-O2>
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Perform only the minimal or required set of scalar optimizations.
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=item B<-03>
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An alias for the -O2 option.
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=item B<-04>
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Perform the standard link time inter-procedural optimizations. This will
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attempt to optimize the program taking the entire program into consideration.
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=item B<-O5>
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Perform aggressive link time optimizations. This is the same as -O4 but works
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more aggressively to optimize the program.
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=item B<-disable-inlining>
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Do not run the inlining pass. Functions will not be inlined into other
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functions.
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=item B<-disable-opt>
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Completely disable optimization. The various B<-On> options will be ignored and
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no link time optimization passes will be run.
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=item B<-disable-internalize>
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Do not mark all symbols as internal.
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=item B<-verify>
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Run the verification pass after each of the passes to verify intermediate
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results.
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=item B<-s>
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Strip symbol info from the executable to make it smaller.
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=item B<-export-dynamic>
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An alias for -disable-internalize
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=item B<-load> F<module>
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Load an optimization module, F<module>, which is expected to be a dynamic
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library that provides the function name C<RunOptimizations>. This function will
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be passed the PassManager, and the optimization level (values 0-5 based on the
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B<-On> option). This function may add passes to the PassManager that should be
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run. This feature allows the optimization passes of B<llvm-ld> to be extended.
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=item B<-post-link-opt>F<Path>
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Run post-link optimization program. After linking is completed a bytecode file
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will be generated. It will be passed to the program specified by F<Path> as the
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first argument. The second argument to the program will be the name of a
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temporary file into which the program should place its optimized output. For
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example, the "no-op optimization" would be a simple shell script:
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=over
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#!/bin/bash
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cp $1 $2
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=back
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=back
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=head2 Miscellaneous Options
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=over
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=item B<-v>
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Specifies verbose mode. In this mode the linker will print additional
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information about the actions it takes, programs it executes, etc.
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=back
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=head1 EXIT STATUS
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If B<llvm-ld> succeeds, it will exit with 0 return code. If an error occurs,
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it will exit with a non-zero return code.
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=head1 ENVIRONMENT
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The C<LLVM_LIB_SEARCH_PATH> environment variable is used to find bytecode
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libraries. Any paths specified in this variable will be searched after the C<-L>
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options.
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=head1 SEE ALSO
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L<llvm-ar|llvm-ar>
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=head1 AUTHORS
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Maintained by the LLVM Team (L<http://llvm.org>).
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=cut
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