docs/CommandGuide/gccld.html - platform/external/llvm - Gitiles

 <html>
 <title>
 LLVM: gccld tool
 </title>

 <body>

 <center>
 <h1>LLVM: gccld tool</h1>
 </center>
 <HR>

 <h3>
 NAME
 </h3>

 gccld

 <h3>
 SYNOPSIS
 </h3>

 gccld [options] &lt; filename&gt; [ filename ...]
 <h3>
 DESCRIPTION
 </h3>

 The gccld utility 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 library or an executable bytecode program.  Using additional options,
 gccld is able to produce native code executables.
 <p>
 The gccld utility is primarily used by the GCC front end, and as such, attempts
 to mimic the interface provided by the default system linker so that it can act
 as a "drop-in" replacement.

 <h4>
 Search Order
 </h4>
 When looking for objects specified on the command line, gccld will search for
 the object first in the current directory and then in the directory specified
 by LLVM_LIB_SEARCH_PATH.  If it cannot find the object, it fails.
 <p>
 When looking for a library specified with the -l option, gccld first attempts
 to load a file with that name from the current directory.  If that fails, it
 looks for lib&lt;library&gt;.bc, lib&lt;library&gt;.a, or
 lib&lt;library&gt;.so, in that order, in each directory added to the library
 search path with the -L option.  These directories are searched in order they
 were specified.  If the library cannot be located, then gccld looks in the
 directory specified by the LLVM_LIB_SEARCH_PATH environment variable.  If it
 does not find lib&lt;library&gt;.[bc | a | so] there, it fails.

 The -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.

 <h4>
 Link order
 </h4>
 All object 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.

 <h4>
 Library Linkage
 </h4>
 Object files and static bytecode 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.

 <h4>
 Native code generation
 </h4>
 The gccld program has limited support for native code generation.
 <h3>
 OPTIONS
 </h3>

 <ul>
 	<li> -help
 	<br>
 	Print a summary of command line options.
 	<p>

 	<li> -o &lt;filename&gt;
 	<br>
 	Specify the output filename which will hold the linked bytecode.
 	<p>

 	<li> -stats
 	<br>
 	Print statistics.
 	<p>

 	<li> -time-passes
 	<br>
 	Record the amount of time needed for each pass and print it to standard
 	error.
 	<p>

 	<li> -verify
 	<br>
 	Verify each pass result.
 	<p>

 	<li> -L=&lt;directory&gt;
 	<br>
 	Add directory to the list of directories to search when looking for
 	libraries.
 	<p>

 	<li> -disable-internalize
 	<br>
 	Do not mark all symbols as internal.
 	<p>

 	<li> -internalize-public-api-file &lt;filename&gt;
 	<br>
 	Preserve the list of symbol names in the file filename.
 	<p>

 	<li> -internalize-public-api-list &lt;list&gt;
 	<br>
 	Preserve the symbol names in list.
 	<p>

 	<li> -l=&lt;library&gt;
 	<br>
 	Specify libraries to include when linking the output file.  When linking,
 	gccld will first attempt to load a file with the pathname library.  If that
 	fails, it will then attempt to load lib&lt;library&gt;.bc,
 	lib&lt;library&gt;.a, and lib&lt;library&gt;.so, in that order.
 	<p>

 	<li> -link-as-library
 	<br>
 	Link the .bc files together as a library, not an executable.
 	<p>

 	<li> -native
 	<br>
 	Generate a native, machine code executable.
   <p>
   When generating native executables, gccld first checks for a bytecode version
   of the library and links it in, if necessary.  If the library is missing,
   gccld skips it.  Then, gccld links in the same libraries as native code.
   <p>
   In this way, gccld should be able to link in optimized bytecode subsets of
   common libraries and then link in any part of the library that hasn't been
   converted to bytecode.
 	<p>

 	<li> -s
 	<br>
 	Strip symbol information from the generated executable.
 	<p>

 	<li> -v
 	<br>
 	Print information about actions taken.
 </ul>

 <h3>
 EXIT STATUS
 </h3>

 If gccld succeeds, it will exit with 0.  Otherwise, if an error occurs, it
 will exit with a non-zero value.

 <h3>
 SEE ALSO
 </h3>
 gccas

 <h3>
 BUGS
 </h3>
 The -L option cannot be used for find native code libraries when using the
 -native option.

 <HR>
 <a href="http://llvm.cs.uiuc.edu">LLVM Team</a>
 </body>
 </html>
	<html>
	<title>
	LLVM: gccld tool
	</title>

	<body>

	<center>
	<h1>LLVM: gccld tool</h1>
	</center>
	<HR>

	<h3>
	NAME
	</h3>

	gccld

	<h3>
	SYNOPSIS
	</h3>

	gccld [options] < filename> [ filename ...]
	<h3>
	DESCRIPTION
	</h3>

	The gccld utility 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 library or an executable bytecode program. Using additional options,
	gccld is able to produce native code executables.
	<p>
	The gccld utility is primarily used by the GCC front end, and as such, attempts
	to mimic the interface provided by the default system linker so that it can act
	as a "drop-in" replacement.

	<h4>
	Search Order
	</h4>
	When looking for objects specified on the command line, gccld will search for
	the object first in the current directory and then in the directory specified
	by LLVM_LIB_SEARCH_PATH. If it cannot find the object, it fails.
	<p>
	When looking for a library specified with the -l option, gccld first attempts
	to load a file with that name from the current directory. If that fails, it
	looks for lib<library>.bc, lib<library>.a, or
	lib<library>.so, in that order, in each directory added to the library
	search path with the -L option. These directories are searched in order they
	were specified. If the library cannot be located, then gccld looks in the
	directory specified by the LLVM_LIB_SEARCH_PATH environment variable. If it
	does not find lib<library>.[bc \| a \| so] there, it fails.

	The -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.

	<h4>
	Link order
	</h4>
	All object 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.

	<h4>
	Library Linkage
	</h4>
	Object files and static bytecode 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.

	<h4>
	Native code generation
	</h4>
	The gccld program has limited support for native code generation.
	<h3>
	OPTIONS
	</h3>

	<ul>
	<li> -help
	<br>
	Print a summary of command line options.
	<p>

	<li> -o <filename>
	<br>
	Specify the output filename which will hold the linked bytecode.
	<p>

	<li> -stats
	<br>
	Print statistics.
	<p>

	<li> -time-passes
	<br>
	Record the amount of time needed for each pass and print it to standard
	error.
	<p>

	<li> -verify
	<br>
	Verify each pass result.
	<p>

	<li> -L=<directory>
	<br>
	Add directory to the list of directories to search when looking for
	libraries.
	<p>

	<li> -disable-internalize
	<br>
	Do not mark all symbols as internal.
	<p>

	<li> -internalize-public-api-file <filename>
	<br>
	Preserve the list of symbol names in the file filename.
	<p>

	<li> -internalize-public-api-list <list>
	<br>
	Preserve the symbol names in list.
	<p>

	<li> -l=<library>
	<br>
	Specify libraries to include when linking the output file. When linking,
	gccld will first attempt to load a file with the pathname library. If that
	fails, it will then attempt to load lib<library>.bc,
	lib<library>.a, and lib<library>.so, in that order.
	<p>

	<li> -link-as-library
	<br>
	Link the .bc files together as a library, not an executable.
	<p>

	<li> -native
	<br>
	Generate a native, machine code executable.
	<p>
	When generating native executables, gccld first checks for a bytecode version
	of the library and links it in, if necessary. If the library is missing,
	gccld skips it. Then, gccld links in the same libraries as native code.
	<p>
	In this way, gccld should be able to link in optimized bytecode subsets of
	common libraries and then link in any part of the library that hasn't been
	converted to bytecode.
	<p>

	<li> -s
	<br>
	Strip symbol information from the generated executable.
	<p>

	<li> -v
	<br>
	Print information about actions taken.
	</ul>

	<h3>
	EXIT STATUS
	</h3>

	If gccld succeeds, it will exit with 0. Otherwise, if an error occurs, it
	will exit with a non-zero value.

	<h3>
	SEE ALSO
	</h3>
	gccas

	<h3>
	BUGS
	</h3>
	The -L option cannot be used for find native code libraries when using the
	-native option.

	<HR>
	<a href="http://llvm.cs.uiuc.edu">LLVM Team</a>
	</body>
	</html>