=head1 DESCRIPTION
-The B<llvm-ld> tool takes a set of LLVM bytecode files and links them
-together into a single LLVM bytecode file. The output bytecode file can be
-another bytecode file or an executable bytecode program. Using additional
+The B<llvm-ld> tool takes a set of LLVM bitcode files and links them
+together into a single LLVM bitcode file. The output bitcode file can be
+another bitcode file or an executable bitcode program. Using additional
options, B<llvm-ld> is able to produce native code executables.
The B<llvm-ld> tool is the main linker for LLVM. It is used to link together
=head2 Link order
-All object and bytecode files are linked first in the order they were
+All object and bitcode files are linked first in the order they were
specified on the command line. All library files are linked next.
Some libraries may not be linked into the object program; see below.
=head2 Library Linkage
-Object files and static bytecode objects are always linked into the output
+Object files and static bitcode objects are always linked into the output
file. Library archives (.a files) load only the objects within the archive
that define symbols needed by the output file. Hence, libraries should be
listed after the object files and libraries which need them; otherwise, the
The B<llvm-ld> program has limited support for native code generation, when
using the B<-native> or B<-native-cbe> options. Native code generation is
-perfomed by converting the linked bytecode into native assembly (.s) or C code
+performed by converting the linked bitcode into native assembly (.s) or C code
and running the system compiler (typically gcc) on the result.
=head1 OPTIONS
F<a.out> for compatibility with B<ld>. The output will be written to
F<filename>.
+=item B<-b> F<filename>
+
+This option can be used to override the output bitcode file name. By default,
+the name of the bitcode output file is one more ".bc" suffix added to the name
+specified by B<-o filename> option.
+
=item B<-l>F<name>
This option specifies the F<name> of a library to search when resolving symbols
=item B<-link-as-library>
-Link the bytecode files together as a library, not an executable. In this mode,
+Link the bitcode files together as a library, not an executable. In this mode,
undefined symbols will be permitted.
=item B<-r>
An alias for -link-as-library.
-=item B<-march=>C<target>
-
-Specifies the kind of machine for which code or assembly should be generated.
-
=item B<-native>
Generate a native machine code executable.
-When generating native executables, B<llvm-ld> first checks for a bytecode
+When generating native executables, B<llvm-ld> first checks for a bitcode
version of the library and links it in, if necessary. If the library is
missing, B<llvm-ld> skips it. Then, B<llvm-ld> links in the same
libraries as native code.
-In this way, B<llvm-ld> should be able to link in optimized bytecode
+In this way, B<llvm-ld> should be able to link in optimized bitcode
subsets of common libraries and then link in any part of the library that
-hasn't been converted to bytecode.
+hasn't been converted to bitcode.
=item B<-native-cbe>
=over
-=item B<-O0>
-
-An alias for the -O1 option.
-
-=item B<-O1>
-
-Optimize for linking speed, not execution speed. The optimizer will attempt to
-reduce the size of the linked program to reduce I/O but will not otherwise
-perform any link-time optimizations.
-
-=item B<-O2>
-
-Perform only the minimal or required set of scalar optimizations.
-
-=item B<-03>
-
-An alias for the -O2 option.
-
-=item B<-04>
-
-Perform the standard link time inter-procedural optimizations. This will
-attempt to optimize the program taking the entire program into consideration.
-
-=item B<-O5>
-
-Perform aggressive link time optimizations. This is the same as -O4 but works
-more aggressively to optimize the program.
-
=item B<-disable-inlining>
Do not run the inlining pass. Functions will not be inlined into other
=item B<-disable-opt>
-Completely disable optimization. The various B<-On> options will be ignored and
-no link time optimization passes will be run.
+Completely disable optimization.
=item B<-disable-internalize>
An alias for B<-disable-internalize>
-=item B<-load> F<module>
-
-Load an optimization module, F<module>, which is expected to be a dynamic
-library that provides the function name C<RunOptimizations>. This function will
-be passed the PassManager, and the optimization level (values 0-5 based on the
-B<-On> option). This function may add passes to the PassManager that should be
-run. This feature allows the optimization passes of B<llvm-ld> to be extended.
-
=item B<-post-link-opt>F<Path>
-Run post-link optimization program. After linking is completed a bytecode file
+Run post-link optimization program. After linking is completed a bitcode file
will be generated. It will be passed to the program specified by F<Path> as the
first argument. The second argument to the program will be the name of a
temporary file into which the program should place its optimized output. For
=head1 ENVIRONMENT
-The C<LLVM_LIB_SEARCH_PATH> environment variable is used to find bytecode
+The C<LLVM_LIB_SEARCH_PATH> environment variable is used to find bitcode
libraries. Any paths specified in this variable will be searched after the C<-L>
options.
projects / oota-llvm.git / blobdiff