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-rw-r--r-- | ld/ld.texinfo | 758 |
1 files changed, 412 insertions, 346 deletions
diff --git a/ld/ld.texinfo b/ld/ld.texinfo index 915761a..b6ff46b 100644 --- a/ld/ld.texinfo +++ b/ld/ld.texinfo @@ -160,40 +160,8 @@ you have many choices to control its behavior. @cindex command line @cindex options -Here is a summary of the options you can use on the @code{ld} command -line: - -@c FIXME! -relax only avail h8/300, i960. Conditionals screwed in examples. -@smallexample -ld [ -o @var{output} ] @var{objfile}@dots{} - [ -A@var{architecture} ] [ -b @var{input-format} ] - [ -Bstatic ] [ -Bdynamic ] [ -Bsymbolic ] - [ -c @var{MRI-commandfile} ] [ -d | -dc | -dp ] - [ -defsym @var{symbol}=@var{expression} ] - [ -dynamic-linker @var{file} ] [ -embedded-relocs ] [ -E ] - [ -export-dynamic ] [ -e @var{entry} ] [ -F ] [ -F @var{format} ] - [ -format @var{input-format} ] [ -g ] [ -G @var{size} ] - [ -help ] [ -i ] [ -l@var{archive} ] [ -L@var{searchdir} ] - [ -M ] [ -Map @var{mapfile} ] [ -m @var{emulation} ] - [ -N | -n ] [ -noinhibit-exec ] [ -no-keep-memory ] - [ -oformat @var{output-format} ] [ -R @var{filename} ] - [ -relax ] [ -retain-symbols-file @var{filename} ] - [ -r | -Ur ] [ -rpath @var{dir} ] [-rpath-link @var{dir} ] - [ -S ] [ -s ] [ -soname @var{name} ] [ -shared ] - [ -sort-common ] [ -stats ] [ -T @var{commandfile} ] - [ -Ttext @var{org} ] [ -Tdata @var{org} ] - [ -Tbss @var{org} ] [ -t ] [ -traditional-format ] - [ -u @var{symbol}] [-V] [-v] [ -verbose] [ -version ] - [ -warn-common ] [ -warn-constructors] [ -warn-multiple-gp ] - [ -warn-once ] [ -y @var{symbol} ] [ -X ] [-x ] - [ -( [ archives ] -) ] - [ --start-group [ archives ] --end-group ] - [ -split-by-reloc @var{count} ] [ -split-by-file ] - [ --whole-archive ] [ --no-whole-archive ] [ --wrap @var{symbol} ] -@end smallexample - -This plethora of command-line options may seem intimidating, but in -actual practice few of them are used in any particular context. +The linker supports a plethora of command-line options, but in actual +practice few of them are used in any particular context. @cindex standard Unix system For instance, a frequent use of @code{ld} is to link standard Unix object files on a standard, supported Unix system. On such a system, to @@ -209,28 +177,17 @@ the library @code{libc.a}, which will come from the standard search directories. (See the discussion of the @samp{-l} option below.) The command-line options to @code{ld} may be specified in any order, and -may be repeated at will. Repeating most options with a -different argument will either have no further effect, or override prior +may be repeated at will. Repeating most options with a different +argument will either have no further effect, or override prior occurrences (those further to the left on the command line) of that -option. - -@ifclear SingleFormat -The exceptions---which may meaningfully be used more than once---are -@samp{-A}, @samp{-b} (or its synonym @samp{-format}), @samp{-defsym}, -@samp{-L}, @samp{-l}, @samp{-R}, @samp{-u}, and @samp{-(} (or its -synonym @samp{--start-group}). -@end ifclear -@ifset SingleFormat -The exceptions---which may meaningfully be used more than once---are -@samp{-A}, @samp{-defsym}, @samp{-L}, @samp{-l}, @samp{-R}, @samp{-u}, -and @samp{-(} (or its synonym @samp{--start-group}). -@end ifset +option. Options which may be meaningfully specified more than once are +noted in the descriptions below. @cindex object files -The list of object files to be linked together, shown as @var{objfile}@dots{}, -may follow, precede, or be mixed in with command-line options, except that -an @var{objfile} argument may not be placed between an option and -its argument. +Non-option arguments are objects files which are to be linked together. +They may follow, precede, or be mixed in with command-line options, +except that an object file argument may not be placed between an option +and its argument. Usually the linker is invoked with at least one object file, but you can specify other forms of binary input files using @samp{-l}, @samp{-R}, @@ -261,10 +218,20 @@ requires them. For example, @samp{--oformat srec} and of multiple-letter options are accepted. @table @code +@kindex -a@var{keyword} +@item -a@var{keyword} +This option is supported for HP/UX compatibility. The @var{keyword} +argument must be one of the strings @samp{archive}, @samp{shared}, or +@samp{default}. @samp{-aarchive} is functionally equivalent to +@samp{-Bstatic}, and the other two keywords are functionally equivalent +to @samp{-Bdynamic}. This option may be used any number of times. + @ifset I960 @cindex architectures @kindex -A@var{arch} @item -A@var{architecture} +@kindex --architecture=@var{arch} +@itemx --architecture=@var{architecture} In the current release of @code{ld}, this option is useful only for the Intel 960 family of architectures. In that @code{ld} configuration, the @var{architecture} argument identifies the particular architecture in @@ -279,9 +246,11 @@ other architecture families. @ifclear SingleFormat @cindex binary input format @kindex -b @var{format} +@kindex --format=@var{format} @cindex input format @cindex input format @item -b @var{input-format} +@itemx --format=@var{input-format} @code{ld} may be configured to support more than one kind of object file. If your @code{ld} is configured this way, you can use the @samp{-b} option to specify the binary format for input object files @@ -291,8 +260,7 @@ to specify this, as @code{ld} should be configured to expect as a default input format the most usual format on each machine. @var{input-format} is a text string, the name of a particular format supported by the BFD libraries. (You can list the available binary -formats with @samp{objdump -i}.) @w{@samp{-format @var{input-format}}} -has the same effect, as does the script command @code{TARGET}. +formats with @samp{objdump -i}.) @xref{BFD}. You may want to use this option if you are linking files with an unusual @@ -311,28 +279,11 @@ format from a script, using the command @code{TARGET}; see @ref{Option Commands}. @end ifclear -@kindex -Bstatic -@item -Bstatic -Do not link against shared libraries. This is only meaningful on -platforms for which shared libraries are supported. - -@kindex -Bdynamic -@item -Bdynamic -Link against dynamic libraries. This is only meaningful on platforms -for which shared libraries are supported. This option is normally the -default on such platforms. - -@kindex -Bsymbolic -@item -Bsymbolic -When creating a shared library, bind references to global symbols to the -definition within the shared library, if any. Normally, it is possible -for a program linked against a shared library to override the definition -within the shared library. This option is only meaningful on ELF -platforms which support shared libraries. - @kindex -c @var{MRI-cmdfile} +@kindex --mri-script=@var{MRI-cmdfile} @cindex compatibility, MRI @item -c @var{MRI-commandfile} +@itemx --mri-script=@var{MRI-commandfile} For compatibility with linkers produced by MRI, @code{ld} accepts script files written in an alternate, restricted command language, described in @ref{MRI,,MRI Compatible Script Files}. Introduce MRI script files with @@ -355,43 +306,11 @@ specified (with @samp{-r}). The script command @code{FORCE_COMMON_ALLOCATION} has the same effect. @xref{Option Commands}. -@cindex symbols, from command line -@kindex -defsym @var{symbol}=@var{exp} -@item -defsym @var{symbol}=@var{expression} -Create a global symbol in the output file, containing the absolute -address given by @var{expression}. You may use this option as many -times as necessary to define multiple symbols in the command line. A -limited form of arithmetic is supported for the @var{expression} in this -context: you may give a hexadecimal constant or the name of an existing -symbol, or use @code{+} and @code{-} to add or subtract hexadecimal -constants or symbols. If you need more elaborate expressions, consider -using the linker command language from a script (@pxref{Assignment, , -Assignment: Symbol Definitions}). @emph{Note:} there should be no -white space between @var{symbol}, the equals sign (``@key{=}''), and -@var{expression}. - -@ifset GENERIC -@cindex dynamic linker, from command line -@kindex -dynamic-linker @var{file} -@item -dynamic-linker @var{file} -Set the name of the dynamic linker. This is only meaningful when -generating dynamically linked ELF executables. The default dynamic -linker is normally correct; don't use this unless you know what you are -doing. -@end ifset - -@cindex MIPS embedded PIC code -@kindex -embedded-relocs -@item -embedded-relocs -This option is only meaningful when linking MIPS embedded PIC code, -generated by the -membedded-pic option to the @sc{gnu} compiler and -assembler. It causes the linker to create a table which may be used at -runtime to relocate any data which was statically initialized to pointer -values. See the code in testsuite/ld-empic for details. - @cindex entry point, from command line @kindex -e @var{entry} +@kindex --entry=@var{entry} @item -e @var{entry} +@itemx --entry=@var{entry} Use @var{entry} as the explicit symbol for beginning execution of your program, rather than the default entry point. @xref{Entry Point}, for a discussion of defaults and other ways of specifying the @@ -402,10 +321,10 @@ entry point. @kindex -export-dynamic @item -E @itemx -export-dynamic -When creating an ELF file, add all symbols to the dynamic symbol table. -Normally, the dynamic symbol table contains only symbols which are used -by a dynamic object. This option is needed for some uses of -@code{dlopen}. +When creating a dynamically linked executable, add all symbols to the +dynamic symbol table. Normally, the dynamic symbol table contains only +symbols which are used by a dynamic object. This option is needed for +some uses of @code{dlopen}. @ifclear SingleFormat @kindex -F @@ -419,10 +338,6 @@ option or the @code{TARGET} command in linker scripts for output files, the @code{GNUTARGET} environment variable) are more flexible, but @code{ld} accepts the @samp{-F} option for compatibility with scripts written to call the old linker. - -@kindex -format -@item -format @var{input-format} -Synonym for @samp{-b @var{input-format}}. @end ifclear @kindex -g @@ -430,17 +345,25 @@ Synonym for @samp{-b @var{input-format}}. Ignored. Provided for compatibility with other tools. @kindex -G +@kindex --gpsize @cindex object size @item -G@var{value} -@itemx -G @var{value} +@itemx --gpsize=@var{value} Set the maximum size of objects to be optimized using the GP register to -@var{size} under MIPS ECOFF. Ignored for other object file formats. +@var{size}. This is only meaningful for object file formats such as +MIPS ECOFF which supports putting large and small objects into different +sections. This is ignored for other object file formats. -@cindex help -@cindex usage -@kindex -help -@item -help -Print a summary of the command-line options on the standard output and exit. +@cindex runtime library name +@kindex -h@var{name} +@kindex -soname=@var{name} +@item -h@var{name} +@itemx -soname=@var{name} +When creating an ELF shared object, set the internal DT_SONAME field to +the specified name. When an executable is linked with a shared object +which has a DT_SONAME field, then when the executable is run the dynamic +linker will attempt to load the shared object specified by the DT_SONAME +field rather than the using the file name given to the linker. @kindex -i @cindex incremental link @@ -449,16 +372,20 @@ Perform an incremental link (same as option @samp{-r}). @cindex archive files, from cmd line @kindex -l@var{archive} -@item -l@var{ar} -Add archive file @var{archive} to the list of files to link. This +@kindex --library=@var{archive} +@item -l@var{archive} +@itemx --library=@var{archive} +Add archive file @var{archive} to the list of files to link. This option may be used any number of times. @code{ld} will search its -path-list for occurrences of @code{lib@var{ar}.a} for every @var{archive} -specified. +path-list for occurrences of @code{lib@var{archive}.a} for every +@var{archive} specified. File extensions other than @code{.a} may be +used on certain systems. @cindex search directory, from cmd line @kindex -L@var{dir} +@kindex --library-path=@var{dir} @item -L@var{searchdir} -@itemx -L @var{searchdir} +@itemx --library-path=@var{searchdir} Add path @var{searchdir} to the list of paths that @code{ld} will search for archive libraries and @code{ld} control scripts. You may use this option any number of times. The directories are searched in the order @@ -477,66 +404,310 @@ The paths can also be specified in a link script with the @code{SEARCH_DIR} command. Directories specified this way are searched at the point in which the linker script appears in the command line. -@cindex link map -@kindex -M -@item -M -Print (to the standard output) a link map---diagnostic information about -where symbols are mapped by @code{ld}, and information on global common -storage allocation. - -@cindex link map -@kindex -Map -@item -Map @var{mapfile} -Print to the file @var{mapfile} a link map---diagnostic information -about where symbols are mapped by @code{ld}, and information on global -common storage allocation. - @cindex emulation @kindex -m @var{emulation} @item -m@var{emulation} -@itemx -m @var{emulation} Emulate the @var{emulation} linker. You can list the available emulations with the @samp{--verbose} or @samp{-V} options. The default depends on how your @code{ld} was configured. +@cindex link map +@kindex -M +@kindex --print-map +@item -M +@itemx --print-map +Print (to the standard output) a link map---diagnostic information about +where symbols are mapped by @code{ld}, and information on global common +storage allocation. + +@kindex -n +@cindex read-only text +@cindex NMAGIC +@kindex --nmagic +@item -n +@itemx --nmagic +Set the text segment to be read only, and mark the output as +@code{NMAGIC} if possible. + @kindex -N +@kindex --omagic @cindex read/write from cmd line -@kindex OMAGIC +@cindex OMAGIC @item -N +@itemx --omagic Set the text and data sections to be readable and writable. Also, do not page-align the data segment. If the output format supports Unix style magic numbers, mark the output as @code{OMAGIC}. -@kindex -n -@cindex read-only text -@kindex NMAGIC -@item -n -Set the text segment to be read only, and mark the output as -@code{NMAGIC} if possible. +@kindex -o @var{output} +@kindex --output=@var{output} +@cindex naming the output file +@item -o @var{output} +@itemx --output=@var{output} +Use @var{output} as the name for the program produced by @code{ld}; if this +option is not specified, the name @file{a.out} is used by default. The +script command @code{OUTPUT} can also specify the output file name. -@cindex output file after errors -@kindex -noinhibit-exec -@item -noinhibit-exec -Retain the executable output file whenever it is still usable. -Normally, the linker will not produce an output file if it encounters -errors during the link process; it exits without writing an output file -when it issues any error whatsoever. +@cindex partial link +@cindex relocatable output +@kindex -r +@kindex --relocateable +@item -r +@itemx --relocateable +Generate relocatable output---i.e., generate an output file that can in +turn serve as input to @code{ld}. This is often called @dfn{partial +linking}. As a side effect, in environments that support standard Unix +magic numbers, this option also sets the output file's magic number to +@code{OMAGIC}. +@c ; see @code{-N}. +If this option is not specified, an absolute file is produced. When +linking C++ programs, this option @emph{will not} resolve references to +constructors; to do that, use @samp{-Ur}. + +This option does the same thing as @samp{-i}. + +@kindex -R @var{file} +@kindex --just-symbols=@var{file} +@cindex symbol-only input +@item -R @var{filename} +@itemx --just-symbols=@var{filename} +Read symbol names and their addresses from @var{filename}, but do not +relocate it or include it in the output. This allows your output file +to refer symbolically to absolute locations of memory defined in other +programs. You may use this option more than once. + +For compatibility with other ELF linkers, if the @code{-R} option is +followed by a directory name, rather than a file name, it is treated as +the @code{-rpath} option. + +@kindex -s +@kindex --strip-all +@cindex strip all symbols +@item -s +@itemx --strip-all +Omit all symbol information from the output file. + +@kindex -S +@kindex --strip-debug +@cindex strip debugger symbols +@item -S +@itemx --strip-debug +Omit debugger symbol information (but not all symbols) from the output file. + +@kindex -t +@kindex --trace +@cindex input files, displaying +@item -t +@itemx --trace +Print the names of the input files as @code{ld} processes them. + +@kindex -T @var{script} +@kindex --script=@var{script} +@cindex script files +@item -T @var{commandfile} +@itemx --script=@var{commandfile} +Read link commands from the file @var{commandfile}. These commands +replace @code{ld}'s default link script (rather than adding +to it), so @var{commandfile} must specify everything necessary to describe +the target format. @xref{Commands}. If @var{commandfile} does not +exist, @code{ld} looks for it in the directories specified by any +preceding @samp{-L} options. Multiple @samp{-T} options accumulate. + +@kindex -u @var{symbol} +@kindex --undefined=@var{symbol} +@cindex undefined symbol +@item -u @var{symbol} +@itemx --undefined=@var{symbol} +Force @var{symbol} to be entered in the output file as an undefined symbol. +Doing this may, for example, trigger linking of additional modules from +standard libraries. @samp{-u} may be repeated with different option +arguments to enter additional undefined symbols. +@c Nice idea, but no such command: This option is equivalent +@c to the @code{EXTERN} linker command. + +@kindex -v +@kindex -V +@kindex --version +@cindex version +@item -v +@itemx --version +@itemx -V +Display the version number for @code{ld}. The @code{-V} option also +lists the supported emulations. + +@kindex -x +@kindex --discard-all +@cindex deleting local symbols +@item -x +@itemx --discard-all +Delete all local symbols. + +@kindex -X +@kindex --discard-locals +@cindex local symbols, deleting +@cindex L, deleting symbols beginning +@item -X +@itemx --discard-locals +Delete all temporary local symbols. For most targets, this is all local +symbols whose names begin with @samp{L}. + +@kindex -y @var{symbol} +@kindex --trace-symbol=@var{symbol} +@cindex symbol tracing +@item -y @var{symbol} +@itemx --trace-symbol=@var{symbol} +Print the name of each linked file in which @var{symbol} appears. This +option may be given any number of times. On many systems it is necessary +to prepend an underscore. + +This option is useful when you have an undefined symbol in your link but +don't know where the reference is coming from. + +@kindex -Y @var{path} +@item -Y @var{path} +Add @var{path} to the default library search path. This option exists +for Solaris compatibility. + +@kindex -z @var{keyword} +@item -z @var{keyword} +This option is ignored for Solaris compatibility. + +@kindex -( +@cindex groups of archives +@item -( @var{archives} -) +@itemx --start-group @var{archives} --end-group +The @var{archives} should be a list of archive files. They may be +either explicit file names, or @samp{-l} options. + +The specified archives are searched repeatedly until no new undefined +references are created. Normally, an archive is searched only once in +the order that it is specified on the command line. If a symbol in that +archive is needed to resolve an undefined symbol referred to by an +object in an archive that appears later on the command line, the linker +would not be able to resolve that reference. By grouping the archives, +they all be searched repeatedly until all possible references are +resolved. + +Using this option has a significant performance cost. It is best to use +it only when there are unavoidable circular references between two or +more archives. + +@kindex -assert @var{keyword} +@item -assert @var{keyword} +This option is ignored for SunOS compatibility. + +@kindex -Bdynamic +@kindex -dy +@kindex -call_shared +@item -Bdynamic +@itemx -dy +@itemx -call_shared +Link against dynamic libraries. This is only meaningful on platforms +for which shared libraries are supported. This option is normally the +default on such platforms. The different variants of this option are +for compatibility with various systems. You may use this option +multiple times on the command line: it affects library searching for +@code{-l} options which follow it. + +@kindex -Bstatic +@kindex -dn +@kindex -non_shared +@kindex -static +@item -Bstatic +@itemx -dn +@itemx -non_shared +@itemx -static +Do not link against shared libraries. This is only meaningful on +platforms for which shared libraries are supported. The different +variants of this option are for compatibility with various systems. You +may use this option multiple times on the command line: it affects +library searching for @code{-l} options which follow it. + +@kindex -Bsymbolic +@item -Bsymbolic +When creating a shared library, bind references to global symbols to the +definition within the shared library, if any. Normally, it is possible +for a program linked against a shared library to override the definition +within the shared library. This option is only meaningful on ELF +platforms which support shared libraries. + +@cindex symbols, from command line +@kindex --defsym @var{symbol}=@var{exp} +@item --defsym @var{symbol}=@var{expression} +Create a global symbol in the output file, containing the absolute +address given by @var{expression}. You may use this option as many +times as necessary to define multiple symbols in the command line. A +limited form of arithmetic is supported for the @var{expression} in this +context: you may give a hexadecimal constant or the name of an existing +symbol, or use @code{+} and @code{-} to add or subtract hexadecimal +constants or symbols. If you need more elaborate expressions, consider +using the linker command language from a script (@pxref{Assignment, , +Assignment: Symbol Definitions}). @emph{Note:} there should be no +white space between @var{symbol}, the equals sign (``@key{=}''), and +@var{expression}. + +@cindex dynamic linker, from command line +@kindex --dynamic-linker @var{file} +@item --dynamic-linker @var{file} +Set the name of the dynamic linker. This is only meaningful when +generating dynamically linked ELF executables. The default dynamic +linker is normally correct; don't use this unless you know what you are +doing. + +@cindex big-endian objects +@cindex endianness +@kindex -EB +@item -EB +Link big-endian objects. This affects the default output format. + +@cindex little-endian objects +@kindex -EL +@item -EL +Link little-endian objects. This affects the default output format. + +@cindex MIPS embedded PIC code +@kindex -embedded-relocs +@item -embedded-relocs +This option is only meaningful when linking MIPS embedded PIC code, +generated by the -membedded-pic option to the @sc{gnu} compiler and +assembler. It causes the linker to create a table which may be used at +runtime to relocate any data which was statically initialized to pointer +values. See the code in testsuite/ld-empic for details. + +@cindex help +@cindex usage +@kindex --help +@item --help +Print a summary of the command-line options on the standard output and exit. + +@cindex link map +@kindex -Map +@item -Map @var{mapfile} +Print to the file @var{mapfile} a link map---diagnostic information +about where symbols are mapped by @code{ld}, and information on global +common storage allocation. @cindex memory usage -@kindex -no-keep-memory -@item -no-keep-memory +@kindex --no-keep-memory +@item --no-keep-memory @code{ld} normally optimizes for speed over memory usage by caching the symbol tables of input files in memory. This option tells @code{ld} to instead optimize for memory usage, by rereading the symbol tables as necessary. This may be required if @code{ld} runs out of memory space while linking a large executable. -@kindex -o @var{output} -@cindex naming the output file -@item -o @var{output} -Use @var{output} as the name for the program produced by @code{ld}; if this -option is not specified, the name @file{a.out} is used by default. The -script command @code{OUTPUT} can also specify the output file name. +@kindex --no-whole-archive +@item --no-whole-archive +Turn off the effect of the @code{--whole-archive} option for subsequent +archive files. + +@cindex output file after errors +@kindex --noinhibit-exec +@item --noinhibit-exec +Retain the executable output file whenever it is still usable. +Normally, the linker will not produce an output file if it encounters +errors during the link process; it exits without writing an output file +when it issues any error whatsoever. @ifclear SingleFormat @kindex -oformat @@ -554,25 +725,21 @@ command @code{OUTPUT_FORMAT} can also specify the output format, but this option overrides it. @xref{BFD}. @end ifclear -@kindex -R @var{file} -@cindex symbol-only input -@item -R @var{filename} -Read symbol names and their addresses from @var{filename}, but do not -relocate it or include it in the output. This allows your output file -to refer symbolically to absolute locations of memory defined in other -programs. +@kindex -qmagic +@item -qmagic +This option is ignored for Linux compatibility. -For compatibility with other ELF linkers, if the @code{-R} option is -followed by a directory name, rather than a file name, it is treated as -the @code{-rpath} option. +@kindex -Qy +@item -Qy +This option is ignored for SVR4 compatibility. -@kindex -relax +@kindex --relax @cindex synthesizing linker @cindex relaxing addressing modes -@item -relax +@item --relax An option with machine dependent effects. @ifset GENERIC -Currently this option is only supported on the H8/300 and the Intel 960. +This option is only supported on a few targets. @end ifset @ifset H8300 @xref{H8/300,,@code{ld} and the H8/300}. @@ -581,10 +748,10 @@ Currently this option is only supported on the H8/300 and the Intel 960. @xref{i960,, @code{ld} and the Intel 960 family}. @end ifset -On some platforms, the @samp{-relax} option performs global optimizations that -become possible when the linker resolves addressing in the program, such -as relaxing address modes and synthesizing new instructions in the -output object file. +On some platforms, the @samp{--relax} option performs global +optimizations that become possible when the linker resolves addressing +in the program, such as relaxing address modes and synthesizing new +instructions in the output object file. @ifset GENERIC On platforms where this is not supported, @samp{-relax} is accepted, but @@ -594,7 +761,7 @@ ignored. @cindex retaining specified symbols @cindex stripping all but some symbols @cindex symbols, retaining selectively -@item -retain-symbols-file @var{filename} +@item --retain-symbols-file @var{filename} Retain @emph{only} the symbols listed in the file @var{filename}, discarding all others. @var{filename} is simply a flat file, with one symbol name per line. This option is especially useful in environments @@ -683,109 +850,46 @@ If the required shared library is not found, the linker will issue a warning and continue with the link. @end ifset -@cindex partial link -@cindex relocatable output -@kindex -r -@item -r -Generate relocatable output---i.e., generate an output file that can in -turn serve as input to @code{ld}. This is often called @dfn{partial -linking}. As a side effect, in environments that support standard Unix -magic numbers, this option also sets the output file's magic number to -@code{OMAGIC}. -@c ; see @code{-N}. -If this option is not specified, an absolute file is produced. When -linking C++ programs, this option @emph{will not} resolve references to -constructors; to do that, use @samp{-Ur}. - -This option does the same thing as @samp{-i}. - -@kindex -S -@cindex strip debugger symbols -@item -S -Omit debugger symbol information (but not all symbols) from the output file. - -@kindex -s -@cindex strip all symbols -@item -s -Omit all symbol information from the output file. - -@ifset GENERIC -@cindex runtime library name -@kindex -soname -@item -soname @var{name} -When creating an ELF shared object, set the internal DT_SONAME field to -the specified name. When an executable is linked with a shared object -which has a DT_SONAME field, then when the executable is run the dynamic -linker will attempt to load the shared object specified by the DT_SONAME -field rather than the using the file name given to the linker. -@end ifset - +@kindex -shared +@kindex -Bshareable @item -shared +@itemx -Bshareable @cindex shared libraries -@kindex -shared -Create a shared library. This is currently only supported on ELF and -SunOS platforms. On SunOS, the linker will automatically create a +Create a shared library. This is currently only supported on ELF, XCOFF +and SunOS platforms. On SunOS, the linker will automatically create a shared library if the @code{-e} option is not used and there are undefined symbols in the link. -@item -sort-common -@kindex -sort-common -Normally, when @code{ld} places the global common symbols in the -appropriate output sections, it sorts them by size. First come all the -one byte symbols, then all the two bytes, then all the four bytes, and -then everything else. This is to prevent gaps between symbols due to -alignment constraints. This option disables that sorting. - -@kindex split -@item -split-by-reloc @var{count} -Trys to creates extra sections in the output file so that no single output section -in the file contains more than @var{count} relocations. This -is useful when generating huge relocatable for downloading into -certain real time kernels with the COFF object file format; since -COFF cannot represent more than 65535 relocations in a single section. -Note that this will fail to work with object file formats which do not -support arbitrary sections. The linker will not split up individual input -sections for redistribution, so if a single input section contains +@item --sort-common +@kindex --sort-common +This option tells @code{ld} to sort the common symbols by size when it +places them in the appropriate output sections. First come all the one +byte symbols, then all the two bytes, then all the four bytes, and then +everything else. This is to prevent gaps between symbols due to +alignment constraints. + +@kindex --split-by-file +@item --split-by-file +Similar to @code{--split-by-reloc} but creates a new output section for +each input file. + +@kindex --split-by-reloc +@item --split-by-reloc @var{count} +Trys to creates extra sections in the output file so that no single +output section in the file contains more than @var{count} relocations. +This is useful when generating huge relocatable for downloading into +certain real time kernels with the COFF object file format; since COFF +cannot represent more than 65535 relocations in a single section. Note +that this will fail to work with object file formats which do not +support arbitrary sections. The linker will not split up individual +input sections for redistribution, so if a single input section contains more than @var{count} relocations one output section will contain that many relocations. -@kindex split -@item -split-by-file -Similar to -split-by-reloc but creates a new output section for each -input file. - -@item -stats -Compute and display statistics about the operation of the linker, -such as execution time and memory usage. - -@kindex -Tbss @var{org} -@kindex -Tdata @var{org} -@kindex -Ttext @var{org} -@cindex segment origins, cmd line -@item -Tbss @var{org} -@itemx -Tdata @var{org} -@itemx -Ttext @var{org} -Use @var{org} as the starting address for---respectively---the -@code{bss}, @code{data}, or the @code{text} segment of the output file. -@var{org} must be a single hexadecimal integer; -for compatibility with other linkers, you may omit the leading -@samp{0x} usually associated with hexadecimal values. - -@kindex -T @var{script} -@cindex script files -@item -T @var{commandfile} -@itemx -T@var{commandfile} -Read link commands from the file @var{commandfile}. These commands -replace @code{ld}'s default link script (rather than adding -to it), so @var{commandfile} must specify everything necessary to describe -the target format. @xref{Commands}. If @var{commandfile} does not -exist, @code{ld} looks for it in the directories specified by any -preceding @samp{-L} options. Multiple @samp{-T} options accumulate. - -@kindex -t -@cindex input files, displaying -@item -t -Print the names of the input files as @code{ld} processes them. +@kindex --stats +@item --stats +Compute and display statistics about the operation of the linker, such +as execution time and memory usage. @kindex -traditional-format @cindex traditional format @@ -802,15 +906,18 @@ full debugging information by over 30 percent. Unfortunately, the SunOS trouble). The @samp{-traditional-format} switch tells @code{ld} to not combine duplicate entries. -@kindex -u @var{symbol} -@cindex undefined symbol -@item -u @var{symbol} -Force @var{symbol} to be entered in the output file as an undefined symbol. -Doing this may, for example, trigger linking of additional modules from -standard libraries. @samp{-u} may be repeated with different option -arguments to enter additional undefined symbols. -@c Nice idea, but no such command: This option is equivalent -@c to the @code{EXTERN} linker command. +@kindex -Tbss @var{org} +@kindex -Tdata @var{org} +@kindex -Ttext @var{org} +@cindex segment origins, cmd line +@item -Tbss @var{org} +@itemx -Tdata @var{org} +@itemx -Ttext @var{org} +Use @var{org} as the starting address for---respectively---the +@code{bss}, @code{data}, or the @code{text} segment of the output file. +@var{org} must be a single hexadecimal integer; +for compatibility with other linkers, you may omit the leading +@samp{0x} usually associated with hexadecimal values. @kindex -Ur @cindex constructors @@ -831,18 +938,6 @@ Display the version number for @code{ld} and list the linker emulations supported. Display which input files can and cannot be opened. Display the linker script if using a default builtin script. -@kindex -v -@kindex -V -@cindex version -@item -v -@itemx -V -Display the version number for @code{ld}. The @code{-V} option also -lists the supported emulations. - -@kindex -version -@item -version -Display the version number for @code{ld} and exit. - @kindex -warn-comon @cindex warnings, on combining symbols @cindex combining symbols, warnings on @@ -963,12 +1058,7 @@ For each archive mentioned on the command line after the in the link, rather than searching the archive for the required object files. This is normally used to turn an archive file into a shared library, forcing every object to be included in the resulting shared -library. - -@kindex --no-whole-archive -@item --no-whole-archive -Turn off the effect of the @code{--whole-archive} option for archives -which appear later on the command line. +library. This option may be used more than once. @kindex --wrap @item --wrap @var{symbol} @@ -1004,47 +1094,6 @@ you should not put the definition of @code{__real_malloc} in the same file as @code{__wrap_malloc}; if you do, the assembler may resolve the call before the linker has a chance to wrap it to @code{malloc}. -@kindex -X -@cindex local symbols, deleting -@cindex L, deleting symbols beginning -@item -X -Delete all temporary local symbols. For most targets, this is all local -symbols whose names begin with @samp{L}. - -@kindex -x -@cindex deleting local symbols -@item -x -Delete all local symbols. - -@kindex -y @var{symbol} -@cindex symbol tracing -@item -y @var{symbol} -Print the name of each linked file in which @var{symbol} appears. This -option may be given any number of times. On many systems it is necessary -to prepend an underscore. - -This option is useful when you have an undefined symbol in your link but -don't know where the reference is coming from. - -@kindex -( -@cindex groups of archives -@item -( @var{archives} -) -@itemx --start-group @var{archives} --end-group -The @var{archives} should be a list of archive files. They may be -either explicit file names, or @samp{-l} options. - -The specified archives are searched repeatedly until no new undefined -references are created. Normally, an archive is searched only once in -the order that it is specified on the command line. If a symbol in that -archive is needed to resolve an undefined symbol referred to by an -object in an archive that appears later on the command line, the linker -would not be able to resolve that reference. By grouping the archives, -they all be searched repeatedly until all possible references are -resolved. - -Using this option has a significant performance cost. It is best to use -it only when there are unavoidable circular references between two or -more archives. @end table @ifset UsesEnvVars @@ -1161,6 +1210,7 @@ You may call special purpose built-in functions. * Evaluation:: Evaluation * Assignment:: Assignment: Defining Symbols * Arithmetic Functions:: Built-In Functions +* Semicolons:: Semicolon Usage @end menu @node Integers @@ -1602,6 +1652,22 @@ paging. @end table +@node Semicolons +@subsection Semicolons + +Semicolons (``@key{;}'') are required in the following places. In all +other places they can appear for aesthetic reasons but are otherwise ignored. + +@table @code +@item Assignment +Semicolons must appear at the end of assignment expressions. +@xref{Assignment} + +@item PHDRS +Semicolons must appear at the end of a @code{PHDRS} statement. +@xref{PHDRS} +@end table + @node MEMORY @section Memory Layout @kindex MEMORY |