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252b5132 RH |
1 | -*- text -*- |
2 | ||
2d30b3da TW |
3 | * TI C54x support, by Timothy Wall. |
4 | ||
176355da NC |
5 | * Added command line switch --section-start to set the start address of any |
6 | specified section. | |
7 | ||
a712da20 NC |
8 | * Added ability to emit full relocation information in linked executables, |
9 | enabled by --emit-relocs. Some post-linkage optimization tools need | |
10 | this information in order to be able to correctly identify and perform | |
11 | symbol relative addressing in the event of changes in section contents | |
12 | (instructions being added or deleted, extending data sections, etc.) | |
13 | ||
919e4093 AM |
14 | Changes in version 2.10: |
15 | ||
5948916f TW |
16 | * Added AT> to the linker script language to allow load-time allocation of |
17 | sections into regions. | |
18 | ||
252b5132 RH |
19 | * Added garbage collection of unused sections, enabled by --gc-sections. |
20 | It does require a bit of backend support; currently implemented are | |
4667035e AM |
21 | arm-elf, avr-elf, d10v-elf, fr30-elf, i386-elf, m32r-elf, m68k-elf, |
22 | mcore-elf, mips-elf, mn10300-elf, ppc-elf, sh-elf, sparc-elf, and v850-elf. | |
987fd5b4 | 23 | Others will ignore the option. |
252b5132 RH |
24 | |
25 | * Added SORT to the linker script language to permit sorting sections by file | |
26 | name or section name. | |
27 | ||
28 | * Added EXTERN to the linker script language as an equivalent to the -u | |
29 | command-line option. | |
30 | ||
31 | * Added ASSERT to the linker script language. | |
32 | ||
277c9afe ILT |
33 | * Added EXCLUDE_FILE to the linker script language for further control over |
34 | wildcard file names. | |
35 | ||
252b5132 RH |
36 | * Added -O option to optimize linker output (as of this writing, this only |
37 | affects ELF shared library generation). | |
38 | ||
39 | * The -e option now accepts a number as well as a symbol name. | |
40 | ||
2575273d ILT |
41 | * Added --no-undefined option to disallow undefined symbols when creating a |
42 | shared library. | |
43 | ||
9b1d3b78 ILT |
44 | * The linker now issues a warning, not an error, for an undefined symbol when |
45 | using -Bsymbolic; use the new --no-undefined option to get the old | |
46 | behaviour. | |
47 | ||
252b5132 RH |
48 | * Added --demangle and --no-demangle options. |
49 | ||
50 | Changes in version 2.9: | |
51 | ||
52 | * Added SQUAD to the linker script language. | |
53 | ||
54 | * New option --no-warn-mismatch. | |
55 | ||
56 | * The MEMORY command now parses the attributes to determine where sections that | |
57 | are not placed in a specific memory region are placed. | |
58 | ||
59 | Changes in version 2.8: | |
60 | ||
61 | * Linker scripts may now contain shell wildcard characters for file and section | |
62 | names. | |
63 | ||
64 | * The linker now supports symbol versions in ELF. | |
65 | ||
66 | * The NOCROSSREFS command was added to the linker script language. | |
67 | ||
68 | * The LOADADDR expression was added to the linker script language. | |
69 | ||
70 | * MAX and MIN functions were added to the linker script language. | |
71 | ||
72 | * The OVERLAY construct was added to the linker script language. | |
73 | ||
74 | * New option --warn-section-align to warn when the address of an output section | |
75 | changes due to alignment of an input section. | |
76 | ||
77 | * New options --filter/-F and --auxiliary/-f. | |
78 | ||
79 | Changes in version 2.7: | |
80 | ||
81 | * New option --cref to print out a cross reference table. | |
82 | ||
83 | * New option --wrap SYMBOL. | |
84 | ||
85 | * New option --no-whole-archive, to turn off the effect of --whole-archive. | |
86 | ||
87 | * Input sections assigned to the output section /DISCARD/ in the linker script | |
88 | are not included in the output file. | |
89 | ||
90 | * The SunOS and ELF linkers now merge stabs debugging information which uses | |
91 | the N_BINCL and N_EINCL stab types. This reduces the amount of debugging | |
92 | information generated. | |
93 | ||
94 | Changes in version 2.6: | |
95 | ||
96 | * When an ELF section name is representable as a C identifier (this is not true | |
97 | of most ELF section names), the linker will automatically define symbols | |
98 | __start_SECNAME and __stop_SECNAME, where SECNAME is the section name, at the | |
99 | beginning and the end of the section. This is used by glibc. | |
100 | ||
101 | * When an ELF section named .gnu.warning is encountered in an input file, the | |
102 | contents of the section are displayed as an error message, and the section is | |
103 | not copied into the output file. This is used by glibc. | |
104 | ||
105 | * When an ELF section named .gnu.warning.SYMBOL is encountered in an input | |
106 | file, and the symbol SYMBOL is referenced by some object file, the contents of | |
107 | the section are displayed as an error message. The section is not copied into | |
108 | the output file, unless doing a relocateable or shared link. This is used by | |
109 | glibc. | |
110 | ||
111 | * New options -split-by-reloc and -split-by-file. | |
112 | ||
113 | * The linker now supports linking PIC compiled code on SPARC SunOS. It can | |
114 | also create SPARC SunOS shared libraries, and, like the native SunOS linker, | |
115 | will do so whenever there is an undefined symbol in the link and neither the -e | |
116 | nor the -r option was used. | |
117 | ||
118 | * The -rpath option may be used on SunOS to set the list of directories to be | |
119 | searched at run time. This overrides the default of building the list from the | |
120 | -L options. | |
121 | ||
122 | * The COFF linker now combines debugging information for structs, unions, and | |
123 | enums, so that even if the same type is defined in multiple input files it will | |
124 | only be defined once in the output file. The --traditional-format switch will | |
125 | prevent this optimization. | |
126 | ||
127 | Changes in version 2.5: | |
128 | ||
129 | * The linker now supports linking against SunOS shared libraries. It still can | |
130 | not link SunOS PIC (Position Independent Code) files, so it can not be used to | |
131 | generate shared libaries. | |
132 | ||
133 | * The linker now supports linking against ELF shared libraries for the i386 | |
134 | (UnixWare) and SPARC (Solaris). It can also link ELF PIC files, and can be | |
135 | used to generate shared libraries. Shared library generation is not well | |
136 | tested; please report any problems encountered. The linker is now enabled for | |
137 | Solaris again. | |
138 | ||
139 | * Eric Youngdale has contributed Linux support code, including linking against | |
140 | Linux a.out shared libraries. The linker produces Linux QMAGIC binaries. | |
141 | ||
142 | * The ELF backend has been converted to the new linker code. To use the new | |
143 | ELF linker, each particular target requires a relocation function. So far, | |
144 | this function has been written for i386 (UnixWare), SPARC (Solaris) MIPS (Irix | |
145 | 5), and HPPA ELF targets. | |
146 | ||
147 | * The -( (--start-group) and -) (--end-group) options have been added to | |
148 | support searching a group of archives as though they were a single archive. | |
149 | This can also be used in a linker script, as GROUP ( files ). | |
150 | ||
151 | * When a file is named on the command line, and the linker does not recognize | |
152 | it as an object file, the linker will now treat the file as a linker script | |
153 | file. A linker script named in this way augments, but does not replace, the | |
154 | default linker script. | |
155 | ||
156 | * The -warn-once option was added. It causes the linker to only warn once per | |
157 | undefined symbol, rather than once per reference. | |
158 | ||
159 | * The COFF backend has been converted to the new linker code. As with ELF, to | |
160 | use the new linker, each particular target requires a relocation function. So | |
161 | far, this function has been written for the i386, m68k, a29k and SH targets. | |
162 | ||
163 | * The -V flag was made a synonym for -v, for SVR4 compatibility. The old -V | |
164 | behaviour is available via --verbose. | |
165 | ||
166 | Changes in version 2.4: | |
167 | ||
168 | * New linker code, by Steve Chamberlain and Ian Taylor. For a.out and ecoff | |
169 | formats (so far), this should result in considerable savings in time | |
170 | and memory used while linking; slightly poorer performance than | |
171 | before for formats not converted yet. | |
172 | ||
173 | * Command-line parsing is no longer done with flex. This means | |
174 | oddball characters in filenames won't get treated as argument | |
175 | separators. | |
176 | ||
177 | * HP-PA ELF support, by Jeff Law. (No SOM support yet.) | |
178 | ||
179 | * Mach i386 support, by David Mackenzie. | |
180 | ||
181 | * Irix 4 shared libraries are now supported (Irix 5 uses ELF, and ELF shared | |
182 | libraries are not yet supported). | |
183 | ||
184 | * COFF shared libraries (as on SCO) should work as well. | |
185 | ||
186 | * The linker is disabled for Solaris. (Actually, it was in 2.3 also, I just | |
187 | forgot to note it.) Some of their C library routines don't work when | |
188 | statically linked, and the GNU linker doesn't support dynamic linking yet. | |
189 | ||
190 | Changes in version 2.3: | |
191 | ||
192 | * Weak symbols are now supported. | |
193 | ||
194 | * ELF support has been added. The linker has been bootstrapped on | |
195 | UnixWare and Solaris. | |
196 | ||
197 | * Alpha OSF/1 support has been added (non dynamic linking only). | |
198 | ||
199 | Changes in version 2.2: | |
200 | ||
201 | * The `bfd' library has been updated to reduce a.out-format string | |
202 | table size. The effect of this is that files linked from many input | |
203 | files with duplicate symbols (`-g' debugging records, or identical | |
204 | static symbols) should be much smaller. | |
205 | ||
206 | Changes in version 2.1: | |
207 | ||
208 | * The ld -ySYMBOL flag (to trace references to SYMBOL) is now implemented. | |
209 | ||
210 | * There is now support for writing ECOFF files, so ld and the | |
211 | other utilities should work on Risc/Ultrix and Irix. | |
212 | ||
213 | \f | |
214 | Local variables: | |
215 | fill-column: 79 | |
216 | End: |