Commit | Line | Data |
---|---|---|
252b5132 | 1 | -*- text -*- |
1c0d3aa6 NC |
2 | * Add support for Score target. |
3 | ||
55255dae L |
4 | * ELF: Add --dynamic-list option to specify a list of global symbols |
5 | whose references shouldn't be bound to the definition within the | |
6 | shared library, or a list of symbols which should be added to the | |
7 | symbol table in the executable. | |
8 | ||
dc0b6aa0 AM |
9 | * The default output section LMA has changed for allocatable sections from |
10 | being equal to VMA, to keeping the difference between LMA and VMA the same as | |
11 | the previous output section in the same region. This is a more useful | |
12 | default when using overlays and other cases where you specify an LMA | |
13 | differing from the VMA for some sections. | |
14 | ||
c17d87de NC |
15 | * New switch: --print-gc-sections to list any sections removed by garabge |
16 | collection. | |
17 | ||
18 | Changes in 2.17: | |
cf88bb9f | 19 | |
d70c5fc7 NC |
20 | * Support for the Infineon XC16X has been added by KPIT Cummins Infosystems. |
21 | ||
dfcffada AM |
22 | * Modify the Linux linker search order to better match ld.so search order. |
23 | Look for DT_NEEDED libraries in paths specified by ld.so.conf before | |
24 | searching the default directories, rather than vice versa. | |
25 | Use $prefix/etc/ld.so.conf if it exists, otherwise /etc/ld.so.conf. | |
c1446dba | 26 | |
4b5bd4e7 DS |
27 | * PE-COFF: Forward exports from DLL's can now be specified in .def files |
28 | passed directly to ld. | |
29 | ||
3c9b82ba NC |
30 | * Support for the Z80 processor family has been added. |
31 | ||
3e8a519c MM |
32 | * Add support for the "@<file>" syntax to the command line, so that extra |
33 | switches can be read from <file>. | |
34 | ||
957d91c1 NC |
35 | Changes in 2.16: |
36 | ||
319850b4 JB |
37 | * Support for the R_ARM_V4BX relocation as defined in the ARM AAELF |
38 | specification has been added via the --fix-v4bx command-line option. | |
39 | ||
b717d30e JJ |
40 | * New linker script construct AS_NEEDED(), which sets the --as-needed flag |
41 | for input files listed inside of it. | |
42 | ||
e2243057 RS |
43 | * A new command-line option, --sysroot, can be used to override the |
44 | default sysroot location. It only applies to toolchains that were | |
45 | configured using --with-sysroot. | |
46 | ||
3ec57632 NC |
47 | * New linker script functions: ORIGIN() and LENGTH() which return information |
48 | about a specified memory region. | |
49 | ||
7499d566 NC |
50 | * Port to MAXQ processor contributed by HCL Tech. |
51 | ||
ba916c8a MM |
52 | * Added SEGMENT_START to the linker script language to permit the user to |
53 | override the base address for a segment from the command-line. | |
54 | ||
8fdd7217 NC |
55 | * ELF: --warn-shared-textrel option to warn if adding a DT_TEXTREL to a shared |
56 | object. | |
57 | ||
bcaa7b3e L |
58 | * Added SORT_BY_NAME and SORT_BY_ALIGNMENT to the linker script |
59 | language to permit sorting sections by section name or section | |
60 | maximum alignment. | |
61 | ||
62 | * Added a new linker command line switch, --sort-section name|alignment, | |
63 | to sort sections by section name or maximum alignment. | |
64 | ||
8fdd7217 NC |
65 | * ELF: --add-needed/--no-add-needed options to control if a DT_NEEDED tag |
66 | should be added when a shared library comes from DT_NEEDED tags. | |
14b3c463 | 67 | |
1fe1f39c NC |
68 | * Support for the crx-elf target added. |
69 | ||
1a320fbb | 70 | * Support for the sh-symbianelf target added. |
1fe1f39c | 71 | |
2d643429 NC |
72 | * A new linker command line switch has been added which allows the hash table |
73 | size to be set to a suitable prime value near to its argument. This switch | |
74 | is --hash-size=<NUMBER>. Also if the switch --reduce-memory-overheads is | |
75 | used, and --hash-size has not been used, then the default value will be set | |
76 | to 1021. | |
77 | ||
35835446 JR |
78 | * Linker map files are now generated with an O(N) algorithm for finding symbols |
79 | that are defined in each section. This uses about 40% more memory for | |
80 | symbols than the old O(N^2) algorithm. You can use the new | |
81 | --reduce-memory-overheads option to select the old algorithm; this option | |
82 | might also be used in the future to select similar tradeoffs. | |
83 | ||
2d643429 | 84 | Changes in 2.15: |
14b3c463 | 85 | |
8fdd7217 NC |
86 | * ELF: --as-needed/--no-as-needed options to control if a DT_NEEDED tag should |
87 | be added only when a shared library is referenced. | |
2d643429 | 88 | |
8fdd7217 | 89 | * PE: --large-address-aware option to indicate executables support virtual |
26d2d8a2 BF |
90 | addresses greater than 2 gigabytes. |
91 | ||
1b169501 BF |
92 | * DWARF 2 support for i386pe added. |
93 | ||
c894ddfb HPN |
94 | * The linker script operator DEFINED() will now yield 1 only for a symbol that |
95 | is defined before the statement where DEFINED is used. | |
96 | ||
7a7f4e42 CD |
97 | * The MIPS --embedded-relocs (used to embed relocations into binaries for |
98 | Embedded-PIC code) is deprecated and will be removed in a future release. | |
99 | ||
0949843d NC |
100 | * cr16c support added by NSC. |
101 | ||
6edf0760 NC |
102 | * m32r Linux (ELF) support added by Renesas. |
103 | ||
560e09e9 NC |
104 | * Improved linker's handling of unresolved symbols. The switch |
105 | --unresolved-symbols=<method> has been added to tell the linker when it | |
106 | should report them and the switch --warn-unresolved-symbols has been added to | |
107 | make reports be issued as warning messages rather than errors. | |
108 | ||
43c58ae6 CD |
109 | Changes in 2.14: |
110 | ||
e8fd7476 NC |
111 | * Added support for Xtensa architecture. |
112 | ||
9c8ebd6a DJ |
113 | * Added --with-sysroot configure switch to specify a target system root, for |
114 | linking against a target filesystem image. | |
115 | ||
312b768e NC |
116 | * Added --accept-unknown-linker-format to restore old linker behaviour (pre |
117 | 2.14) of silently accepting and linking in any files in an unknown binary | |
118 | file format. | |
119 | ||
63fd3b82 NC |
120 | * Added --no-omagic to undo the effects of the -N option. |
121 | ||
004d9caf NC |
122 | * Support for Texas Instruments TMS320C4x and TMS320C3x series of |
123 | DSP's contributed by Michael Hayes and Svein E. Seldal. | |
026df7c5 | 124 | |
8e523c23 NC |
125 | * Added --with-lib-path configure switch to specify default value for |
126 | LIB_PATH. | |
127 | ||
7e392df6 NC |
128 | * ARM port to QNX operating system added by Graeme Peterson. |
129 | ||
cf88bb9f NC |
130 | * IP2K support added by Denis Chertykov. |
131 | ||
2cbb2eef NC |
132 | Changes in 2.13: |
133 | ||
134 | * Support for the Fujitsu FRV architecture added by Red Hat. Models for FR400 | |
135 | and FR500 included. | |
7d553a40 | 136 | |
37020578 JT |
137 | Changes in version 2.13: |
138 | ||
139 | * DEC VAX ELF support, by Matt Thomas. | |
140 | ||
9a66911f NC |
141 | Changes in version 2.12: |
142 | ||
49fda6c8 HPN |
143 | * Support for Don Knuth's MMIX, by Hans-Peter Nilsson. |
144 | ||
3b16e843 NC |
145 | * Support for the OpenRISC 32-bit embedded processor by OpenCores. |
146 | ||
8bd621d8 AM |
147 | * Support for -z nocopyreloc in the x86 ELF linker, which disables |
148 | production of copy relocs. Warning: using this option may result in | |
149 | non-sharable applications. | |
5b343f5a | 150 | |
db6751f2 JJ |
151 | * Support for -z combreloc in the ELF linker, which puts dynamic |
152 | relocations against the same symbol together, so that dynamic linker | |
153 | can use an one-entry symbol lookup cache. | |
154 | ||
155 | * Support for ELF SHF_MERGE section merging, by Jakub Jelinek. | |
156 | ||
9a66911f NC |
157 | Changes in version 2.11: |
158 | ||
b8355149 JH |
159 | * Support for AMD x86-64 architecture, by Jan Hubicka, SuSE Labs. |
160 | ||
18e03609 NC |
161 | * Support added for eliminating duplicate DWARF2 debug information by |
162 | having the compiler generate the information in sections called | |
163 | .gnu.linkonce.wi.XXXX where XXXX is a checksum for the contents. The | |
164 | linker then merges these sections together into the normal .debug_info | |
165 | section. | |
252b5132 | 166 | |
ec4eb78a L |
167 | * The native ELF linker now searches the directories in DT_RUNPATH or |
168 | DT_RPATH of a shared library for shared libraries needed by it. | |
169 | ||
2d30b3da TW |
170 | * TI C54x support, by Timothy Wall. |
171 | ||
176355da NC |
172 | * Added command line switch --section-start to set the start address of any |
173 | specified section. | |
174 | ||
a712da20 NC |
175 | * Added ability to emit full relocation information in linked executables, |
176 | enabled by --emit-relocs. Some post-linkage optimization tools need | |
177 | this information in order to be able to correctly identify and perform | |
178 | symbol relative addressing in the event of changes in section contents | |
179 | (instructions being added or deleted, extending data sections, etc.) | |
180 | ||
22b36938 JE |
181 | * Support for i860, by Jason Eckhardt (preliminary, alpha quality). |
182 | ||
5bcac8a4 HPN |
183 | * Support for CRIS (Axis Communications ETRAX series). |
184 | ||
500800ca NC |
185 | * Support for PDP-11 and 2.11BSD a.out format, by Lars Brinkhoff. |
186 | ||
919e4093 AM |
187 | Changes in version 2.10: |
188 | ||
5948916f TW |
189 | * Added AT> to the linker script language to allow load-time allocation of |
190 | sections into regions. | |
191 | ||
252b5132 RH |
192 | * Added garbage collection of unused sections, enabled by --gc-sections. |
193 | It does require a bit of backend support; currently implemented are | |
4667035e AM |
194 | arm-elf, avr-elf, d10v-elf, fr30-elf, i386-elf, m32r-elf, m68k-elf, |
195 | mcore-elf, mips-elf, mn10300-elf, ppc-elf, sh-elf, sparc-elf, and v850-elf. | |
987fd5b4 | 196 | Others will ignore the option. |
252b5132 RH |
197 | |
198 | * Added SORT to the linker script language to permit sorting sections by file | |
199 | name or section name. | |
200 | ||
201 | * Added EXTERN to the linker script language as an equivalent to the -u | |
202 | command-line option. | |
203 | ||
204 | * Added ASSERT to the linker script language. | |
205 | ||
277c9afe ILT |
206 | * Added EXCLUDE_FILE to the linker script language for further control over |
207 | wildcard file names. | |
208 | ||
252b5132 | 209 | * Added -O option to optimize linker output (as of this writing, this only |
500800ca | 210 | affects ELF shared library generation). |
252b5132 RH |
211 | |
212 | * The -e option now accepts a number as well as a symbol name. | |
213 | ||
2575273d ILT |
214 | * Added --no-undefined option to disallow undefined symbols when creating a |
215 | shared library. | |
216 | ||
9b1d3b78 ILT |
217 | * The linker now issues a warning, not an error, for an undefined symbol when |
218 | using -Bsymbolic; use the new --no-undefined option to get the old | |
219 | behaviour. | |
220 | ||
252b5132 RH |
221 | * Added --demangle and --no-demangle options. |
222 | ||
223 | Changes in version 2.9: | |
224 | ||
225 | * Added SQUAD to the linker script language. | |
226 | ||
227 | * New option --no-warn-mismatch. | |
228 | ||
229 | * The MEMORY command now parses the attributes to determine where sections that | |
230 | are not placed in a specific memory region are placed. | |
231 | ||
232 | Changes in version 2.8: | |
233 | ||
234 | * Linker scripts may now contain shell wildcard characters for file and section | |
235 | names. | |
236 | ||
237 | * The linker now supports symbol versions in ELF. | |
238 | ||
239 | * The NOCROSSREFS command was added to the linker script language. | |
240 | ||
241 | * The LOADADDR expression was added to the linker script language. | |
242 | ||
243 | * MAX and MIN functions were added to the linker script language. | |
244 | ||
245 | * The OVERLAY construct was added to the linker script language. | |
246 | ||
247 | * New option --warn-section-align to warn when the address of an output section | |
248 | changes due to alignment of an input section. | |
249 | ||
250 | * New options --filter/-F and --auxiliary/-f. | |
251 | ||
252 | Changes in version 2.7: | |
253 | ||
254 | * New option --cref to print out a cross reference table. | |
255 | ||
256 | * New option --wrap SYMBOL. | |
257 | ||
258 | * New option --no-whole-archive, to turn off the effect of --whole-archive. | |
259 | ||
260 | * Input sections assigned to the output section /DISCARD/ in the linker script | |
261 | are not included in the output file. | |
262 | ||
263 | * The SunOS and ELF linkers now merge stabs debugging information which uses | |
264 | the N_BINCL and N_EINCL stab types. This reduces the amount of debugging | |
265 | information generated. | |
266 | ||
267 | Changes in version 2.6: | |
268 | ||
269 | * When an ELF section name is representable as a C identifier (this is not true | |
270 | of most ELF section names), the linker will automatically define symbols | |
271 | __start_SECNAME and __stop_SECNAME, where SECNAME is the section name, at the | |
272 | beginning and the end of the section. This is used by glibc. | |
273 | ||
274 | * When an ELF section named .gnu.warning is encountered in an input file, the | |
275 | contents of the section are displayed as an error message, and the section is | |
276 | not copied into the output file. This is used by glibc. | |
277 | ||
278 | * When an ELF section named .gnu.warning.SYMBOL is encountered in an input | |
279 | file, and the symbol SYMBOL is referenced by some object file, the contents of | |
280 | the section are displayed as an error message. The section is not copied into | |
1049f94e | 281 | the output file, unless doing a relocatable or shared link. This is used by |
252b5132 RH |
282 | glibc. |
283 | ||
284 | * New options -split-by-reloc and -split-by-file. | |
285 | ||
286 | * The linker now supports linking PIC compiled code on SPARC SunOS. It can | |
287 | also create SPARC SunOS shared libraries, and, like the native SunOS linker, | |
288 | will do so whenever there is an undefined symbol in the link and neither the -e | |
289 | nor the -r option was used. | |
290 | ||
291 | * The -rpath option may be used on SunOS to set the list of directories to be | |
292 | searched at run time. This overrides the default of building the list from the | |
293 | -L options. | |
294 | ||
295 | * The COFF linker now combines debugging information for structs, unions, and | |
296 | enums, so that even if the same type is defined in multiple input files it will | |
297 | only be defined once in the output file. The --traditional-format switch will | |
298 | prevent this optimization. | |
299 | ||
300 | Changes in version 2.5: | |
301 | ||
302 | * The linker now supports linking against SunOS shared libraries. It still can | |
303 | not link SunOS PIC (Position Independent Code) files, so it can not be used to | |
07f3b6ad | 304 | generate shared libraries. |
252b5132 RH |
305 | |
306 | * The linker now supports linking against ELF shared libraries for the i386 | |
307 | (UnixWare) and SPARC (Solaris). It can also link ELF PIC files, and can be | |
308 | used to generate shared libraries. Shared library generation is not well | |
309 | tested; please report any problems encountered. The linker is now enabled for | |
310 | Solaris again. | |
311 | ||
312 | * Eric Youngdale has contributed Linux support code, including linking against | |
313 | Linux a.out shared libraries. The linker produces Linux QMAGIC binaries. | |
314 | ||
315 | * The ELF backend has been converted to the new linker code. To use the new | |
316 | ELF linker, each particular target requires a relocation function. So far, | |
317 | this function has been written for i386 (UnixWare), SPARC (Solaris) MIPS (Irix | |
318 | 5), and HPPA ELF targets. | |
319 | ||
320 | * The -( (--start-group) and -) (--end-group) options have been added to | |
321 | support searching a group of archives as though they were a single archive. | |
322 | This can also be used in a linker script, as GROUP ( files ). | |
323 | ||
324 | * When a file is named on the command line, and the linker does not recognize | |
325 | it as an object file, the linker will now treat the file as a linker script | |
326 | file. A linker script named in this way augments, but does not replace, the | |
327 | default linker script. | |
328 | ||
329 | * The -warn-once option was added. It causes the linker to only warn once per | |
330 | undefined symbol, rather than once per reference. | |
331 | ||
332 | * The COFF backend has been converted to the new linker code. As with ELF, to | |
333 | use the new linker, each particular target requires a relocation function. So | |
334 | far, this function has been written for the i386, m68k, a29k and SH targets. | |
335 | ||
336 | * The -V flag was made a synonym for -v, for SVR4 compatibility. The old -V | |
337 | behaviour is available via --verbose. | |
338 | ||
339 | Changes in version 2.4: | |
340 | ||
341 | * New linker code, by Steve Chamberlain and Ian Taylor. For a.out and ecoff | |
342 | formats (so far), this should result in considerable savings in time | |
343 | and memory used while linking; slightly poorer performance than | |
344 | before for formats not converted yet. | |
345 | ||
346 | * Command-line parsing is no longer done with flex. This means | |
347 | oddball characters in filenames won't get treated as argument | |
348 | separators. | |
349 | ||
350 | * HP-PA ELF support, by Jeff Law. (No SOM support yet.) | |
351 | ||
352 | * Mach i386 support, by David Mackenzie. | |
353 | ||
354 | * Irix 4 shared libraries are now supported (Irix 5 uses ELF, and ELF shared | |
355 | libraries are not yet supported). | |
356 | ||
357 | * COFF shared libraries (as on SCO) should work as well. | |
358 | ||
359 | * The linker is disabled for Solaris. (Actually, it was in 2.3 also, I just | |
360 | forgot to note it.) Some of their C library routines don't work when | |
361 | statically linked, and the GNU linker doesn't support dynamic linking yet. | |
362 | ||
363 | Changes in version 2.3: | |
364 | ||
365 | * Weak symbols are now supported. | |
366 | ||
367 | * ELF support has been added. The linker has been bootstrapped on | |
368 | UnixWare and Solaris. | |
369 | ||
370 | * Alpha OSF/1 support has been added (non dynamic linking only). | |
371 | ||
372 | Changes in version 2.2: | |
373 | ||
374 | * The `bfd' library has been updated to reduce a.out-format string | |
375 | table size. The effect of this is that files linked from many input | |
376 | files with duplicate symbols (`-g' debugging records, or identical | |
377 | static symbols) should be much smaller. | |
378 | ||
379 | Changes in version 2.1: | |
380 | ||
381 | * The ld -ySYMBOL flag (to trace references to SYMBOL) is now implemented. | |
382 | ||
383 | * There is now support for writing ECOFF files, so ld and the | |
384 | other utilities should work on Risc/Ultrix and Irix. | |
385 | ||
386 | \f | |
387 | Local variables: | |
388 | fill-column: 79 | |
389 | End: |