Revert r103213. It broke several sections of live website.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103219 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 234 insertions, 0 deletions

diff --git a/docs/CommandGuide/llvm-ld.pod b/docs/CommandGuide/llvm-ld.pod
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+=pod
+
+=head1 NAME
+
+llvm-ld - LLVM linker
+
+=head1 SYNOPSIS
+
+B<llvm-ld> <options> <files>
+
+=head1 DESCRIPTION
+
+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
+the output of LLVM front-end compilers and run "link time" optimizations (mostly
+the inter-procedural kind).
+
+The B<llvm-ld> tools attempts to mimic the interface provided by the default
+system linker so that it can act as a I<drop-in> replacement.
+
+=head2 Search Order
+
+When looking for objects specified on the command line, B<llvm-ld> will search 
+for the object first in the current directory and then in the directory 
+specified by the B<LLVM_LIB_SEARCH_PATH> environment variable.  If it cannot 
+find the object, it fails.
+
+When looking for a library specified with the B<-l> option, B<llvm-ld> first
+attempts to load a file with that name from the current directory.  If that
+fails, it looks for libI<library>.bc, libI<library>.a, or libI<library>.I<shared
+library extension>, in that order, in each directory added to the library search
+path with the B<-L> option.  These directories are searched in the order they
+are specified.  If the library cannot be located, then B<llvm-ld> looks in the
+directory specified by the B<LLVM_LIB_SEARCH_PATH> environment variable.  If it
+does not find a library there, it fails.
+
+The I<shared library extension> may be I<.so>, I<.dyld>, I<.dll>, or something
+different, depending upon the system.
+
+The B<-L> option is global.  It does not matter where it is specified in the
+list of command line arguments; the directory is simply added to the search path
+and is applied to all libraries, preceding or succeeding, in the command line.
+
+=head2 Link order
+
+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 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
+library may not be linked in, and the dependent library will not have its
+undefined symbols defined.
+
+=head2 Native code generation
+
+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
+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
+
+=head2 General Options
+
+=over 
+
+=item B<-help>
+
+Print a summary of command line options.
+
+=item B<-v>
+
+Specifies verbose mode. In this mode the linker will print additional
+information about the actions it takes, programs it executes, etc. 
+
+=item B<-stats>
+
+Print statistics.
+
+=item B<-time-passes>
+
+Record the amount of time needed for each pass and print it to standard
+error.
+
+=back 
+
+=head2 Input/Output Options
+
+=over
+
+=item B<-o> F<filename>
+
+This overrides the default output file and specifies the name of the file that
+should be generated by the linker. By default, B<llvm-ld> generates a file named
+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
+for the program. Only the base name should be specified as F<name>, without a
+F<lib> prefix or any suffix. 
+
+=item B<-L>F<Path>
+
+This option tells B<llvm-ld> to look in F<Path> to find any library subsequently
+specified with the B<-l> option. The paths will be searched in the order in
+which they are specified on the command line. If the library is still not found,
+a small set of system specific directories will also be searched. Note that
+libraries specified with the B<-l> option that occur I<before> any B<-L> options
+will not search the paths given by the B<-L> options following it.
+
+=item B<-link-as-library>
+
+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<-native>
+
+Generate a native machine code executable.
+
+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 bitcode
+subsets of common libraries and then link in any part of the library that
+hasn't been converted to bitcode.
+
+=item B<-native-cbe>
+
+Generate a native machine code executable with the LLVM C backend.
+      
+This option is identical to the B<-native> option, but uses the
+C backend to generate code for the program instead of an LLVM native
+code generator.
+
+=back
+
+=head2 Optimization Options
+
+=over 
+
+=item B<-disable-inlining>
+
+Do not run the inlining pass. Functions will not be inlined into other
+functions.
+
+=item B<-disable-opt>
+
+Completely disable optimization.
+
+=item B<-disable-internalize>
+
+Do not mark all symbols as internal.
+
+=item B<-verify-each>
+
+Run the verification pass after each of the passes to verify intermediate
+results.
+
+=item B<-strip-all>
+
+Strip all debug and symbol information from the executable to make it smaller.
+
+=item B<-strip-debug>
+
+Strip all debug information from the executable to make it smaller.
+
+=item B<-s>
+
+An alias for B<-strip-all>.
+
+=item B<-S>
+
+An alias for B<-strip-debug>.
+
+=item B<-export-dynamic>
+
+An alias for B<-disable-internalize>
+
+=item B<-post-link-opt>F<Path>
+
+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
+example, the "no-op optimization" would be a simple shell script:
+
+    #!/bin/bash
+    cp $1 $2
+
+=back
+
+=head1 EXIT STATUS
+
+If B<llvm-ld> succeeds, it will exit with 0 return code.  If an error occurs,
+it will exit with a non-zero return code.
+
+=head1 ENVIRONMENT
+
+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.
+
+=head1 SEE ALSO
+
+L<llvm-link|llvm-link>
+
+=head1 AUTHORS
+
+Maintained by the LLVM Team (L<http://llvm.org>).
+
+=cut