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189 lines
4.6 KiB
HTML
189 lines
4.6 KiB
HTML
<html>
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<title>
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LLVM: gccld tool
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</title>
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<body>
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<center>
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<h1>LLVM: gccld tool</h1>
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</center>
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<HR>
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<h3>
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NAME
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</h3>
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gccld
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<h3>
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SYNOPSIS
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</h3>
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gccld [options] < filename> [ filename ...]
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<h3>
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DESCRIPTION
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</h3>
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The gccld utility takes a set of LLVM bytecode files and links them together
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into a single LLVM bytecode file. The output bytecode file can be another
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bytecode library or an executable bytecode program. Using additional options,
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gccld is able to produce native code executables.
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<p>
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The gccld utility is primarily used by the GCC front end, and as such, attempts
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to mimic the interface provided by the default system linker so that it can act
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as a "drop-in" replacement.
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<h4>
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Search Order
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</h4>
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When looking for objects specified on the command line, gccld will search for
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the object first in the current directory and then in the directory specified
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by LLVM_LIB_SEARCH_PATH. If it cannot find the object, it fails.
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<p>
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When looking for a library specified with the -l option, gccld first attempts
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to load a file with that name from the current directory. If that fails, it
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looks for lib<library>.bc, lib<library>.a, or
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lib<library>.so, in that order, in each directory added to the library
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search path with the -L option. These directories are searched in order they
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were specified. If the library cannot be located, then gccld looks in the
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directory specified by the LLVM_LIB_SEARCH_PATH environment variable. If it
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does not find lib<library>.[bc | a | so] there, it fails.
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The -L option is global. It does not matter where it is specified in the list
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of command line arguments; the directory is simply added to the search path and
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is applied to all libraries, preceding or succeeding, in the command line.
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<h4>
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Link order
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</h4>
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All object files are linked first in the order they were specified on the
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command line. All library files are linked next. Some libraries may not be
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linked into the object program; see below.
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<h4>
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Library Linkage
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</h4>
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Object files and static bytecode objects are always linked into the output
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file. Library archives (.a files) load only the objects within the archive
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that define symbols needed by the output file. Hence, libraries should be
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listed after the object files and libraries which need them; otherwise, the
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library may not be linked in, and the dependent library will not have its
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undefined symbols defined.
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<h4>
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Native code generation
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</h4>
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The gccld program has limited support for native code generation.
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<h3>
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OPTIONS
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</h3>
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<ul>
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<li> -help
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<br>
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Print a summary of command line options.
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<p>
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<li> -o <filename>
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<br>
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Specify the output filename which will hold the linked bytecode.
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<p>
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<li> -stats
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<br>
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Print statistics.
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<p>
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<li> -time-passes
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<br>
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Record the amount of time needed for each pass and print it to standard
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error.
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<p>
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<li> -verify
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<br>
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Verify each pass result.
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<p>
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<li> -L=<directory>
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<br>
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Add directory to the list of directories to search when looking for
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libraries.
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<p>
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<li> -disable-internalize
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<br>
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Do not mark all symbols as internal.
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<p>
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<li> -internalize-public-api-file <filename>
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<br>
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Preserve the list of symbol names in the file filename.
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<p>
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<li> -internalize-public-api-list <list>
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<br>
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Preserve the symbol names in list.
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<p>
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<li> -l=<library>
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<br>
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Specify libraries to include when linking the output file. When linking,
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gccld will first attempt to load a file with the pathname library. If that
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fails, it will then attempt to load lib<library>.bc,
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lib<library>.a, and lib<library>.so, in that order.
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<p>
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<li> -link-as-library
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<br>
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Link the .bc files together as a library, not an executable.
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<p>
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<li> -native
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<br>
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Generate a native, machine code executable.
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<p>
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When generating native executables, gccld first checks for a bytecode version
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of the library and links it in, if necessary. If the library is missing,
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gccld skips it. Then, gccld links in the same libraries as native code.
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<p>
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In this way, gccld should be able to link in optimized bytecode subsets of
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common libraries and then link in any part of the library that hasn't been
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converted to bytecode.
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<p>
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<li> -s
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<br>
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Strip symbol information from the generated executable.
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<p>
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<li> -v
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<br>
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Print information about actions taken.
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</ul>
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<h3>
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EXIT STATUS
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</h3>
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If gccld succeeds, it will exit with 0. Otherwise, if an error occurs, it
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will exit with a non-zero value.
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<h3>
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SEE ALSO
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</h3>
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gccas
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<h3>
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BUGS
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</h3>
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The -L option cannot be used for find native code libraries when using the
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-native option.
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<HR>
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<a href="http://llvm.cs.uiuc.edu">LLVM Team</a>
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</body>
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</html>
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