1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
|
Intro
=====
This directory contains a few sets of files that are used for
configuration in diverse ways:
*.conf Target platform configurations, please read
'Configurations of OpenSSL target platforms' for more
information.
*.tmpl Build file templates, please read 'Build-file
programming with the "unified" build system' as well
as 'Build info files' for more information.
*.pm Helper scripts / modules for the main `Configure`
script. See 'Configure helper scripts for more
information.
Configurations of OpenSSL target platforms
==========================================
Configuration targets are a collection of facts that we know about
different platforms and their capabilities. We organise them in a
hash table, where each entry represent a specific target.
Note that configuration target names must be unique across all config
files. The Configure script does check that a config file doesn't
have config targets that shadow config targets from other files.
In each table entry, the following keys are significant:
inherit_from => Other targets to inherit values from.
Explained further below. [1]
template => Set to 1 if this isn't really a platform
target. Instead, this target is a template
upon which other targets can be built.
Explained further below. [1]
sys_id => System identity for systems where that
is difficult to determine automatically.
enable => Enable specific configuration features.
This MUST be an array of words.
disable => Disable specific configuration features.
This MUST be an array of words.
Note: if the same feature is both enabled
and disabled, disable wins.
as => The assembler command. This is not always
used (for example on Unix, where the C
compiler is used instead).
asflags => Default assembler command flags [4].
cpp => The C preprocessor command, normally not
given, as the build file defaults are
usually good enough.
cppflags => Default C preprocessor flags [4].
defines => As an alternative, macro definitions may be
given here instead of in `cppflags' [4].
If given here, they MUST be as an array of
the string such as "MACRO=value", or just
"MACRO" for definitions without value.
includes => As an alternative, inclusion directories
may be given here instead of in `cppflags'
[4]. If given here, the MUST be an array
of strings, one directory specification
each.
cc => The C compiler command, usually one of "cc",
"gcc" or "clang". This command is normally
also used to link object files and
libraries into the final program.
cxx => The C++ compiler command, usually one of
"c++", "g++" or "clang++". This command is
also used when linking a program where at
least one of the object file is made from
C++ source.
cflags => Defaults C compiler flags [4].
cxxflags => Default C++ compiler flags [4]. If unset,
it gets the same value as cflags.
(linking is a complex thing, see [3] below)
ld => Linker command, usually not defined
(meaning the compiler command is used
instead).
(NOTE: this is here for future use, it's
not implemented yet)
lflags => Default flags used when linking apps,
shared libraries or DSOs [4].
ex_libs => Extra libraries that are needed when
linking shared libraries, DSOs or programs.
The value is also assigned to Libs.private
in $(libdir)/pkgconfig/libcrypto.pc.
shared_cppflags => Extra C preprocessor flags used when
processing C files for shared libraries.
shared_cflag => Extra C compiler flags used when compiling
for shared libraries, typically something
like "-fPIC".
shared_ldflag => Extra linking flags used when linking
shared libraries.
module_cppflags
module_cflags
module_ldflags => Has the same function as the corresponding
`shared_' attributes, but for building DSOs.
When unset, they get the same values as the
corresponding `shared_' attributes.
ar => The library archive command, the default is
"ar".
(NOTE: this is here for future use, it's
not implemented yet)
arflags => Flags to be used with the library archive
command. On Unix, this includes the
command letter, 'r' by default.
ranlib => The library archive indexing command, the
default is 'ranlib' it it exists.
unistd => An alternative header to the typical
'<unistd.h>'. This is very rarely needed.
shared_extension => File name extension used for shared
libraries.
obj_extension => File name extension used for object files.
On unix, this defaults to ".o" (NOTE: this
is here for future use, it's not
implemented yet)
exe_extension => File name extension used for executable
files. On unix, this defaults to "" (NOTE:
this is here for future use, it's not
implemented yet)
shlib_variant => A "variant" identifier inserted between the base
shared library name and the extension. On "unixy"
platforms (BSD, Linux, Solaris, MacOS/X, ...) this
supports installation of custom OpenSSL libraries
that don't conflict with other builds of OpenSSL
installed on the system. The variant identifier
becomes part of the SONAME of the library and also
any symbol versions (symbol versions are not used or
needed with MacOS/X). For example, on a system
where a default build would normally create the SSL
shared library as 'libssl.so -> libssl.so.1.1' with
the value of the symlink as the SONAME, a target
definition that sets 'shlib_variant => "-abc"' will
create 'libssl.so -> libssl-abc.so.1.1', again with
an SONAME equal to the value of the symlink. The
symbol versions associated with the variant library
would then be 'OPENSSL_ABC_<version>' rather than
the default 'OPENSSL_<version>'. The string inserted
into symbol versions is obtained by mapping all
letters in the "variant" identifier to upper case
and all non-alphanumeric characters to '_'.
thread_scheme => The type of threads is used on the
configured platform. Currently known
values are "(unknown)", "pthreads",
"uithreads" (a.k.a solaris threads) and
"winthreads". Except for "(unknown)", the
actual value is currently ignored but may
be used in the future. See further notes
below [2].
dso_scheme => The type of dynamic shared objects to build
for. This mostly comes into play with
engines, but can be used for other purposes
as well. Valid values are "DLFCN"
(dlopen() et al), "DLFCN_NO_H" (for systems
that use dlopen() et al but do not have
fcntl.h), "DL" (shl_load() et al), "WIN32"
and "VMS".
perlasm_scheme => The perlasm method used to create the
assembler files used when compiling with
assembler implementations.
shared_target => The shared library building method used.
This is a target found in Makefile.shared.
build_scheme => The scheme used to build up a Makefile.
In its simplest form, the value is a string
with the name of the build scheme.
The value may also take the form of a list
of strings, if the build_scheme is to have
some options. In this case, the first
string in the list is the name of the build
scheme.
Currently recognised build scheme is "unified".
For the "unified" build scheme, this item
*must* be an array with the first being the
word "unified" and the second being a word
to identify the platform family.
multilib => On systems that support having multiple
implementations of a library (typically a
32-bit and a 64-bit variant), this is used
to have the different variants in different
directories.
bn_ops => Building options (was just bignum options in
the earlier history of this option, hence the
name). This is a string of words that describe
algorithms' implementation parameters that
are optimal for the designated target platform,
such as the type of integers used to build up
the bignum, different ways to implement certain
ciphers and so on. To fully comprehend the
meaning, the best is to read the affected
source.
The valid words are:
THIRTY_TWO_BIT bignum limbs are 32 bits,
this is default if no
option is specified, it
works on any supported
system [unless "wider"
limb size is implied in
assembly code];
BN_LLONG bignum limbs are 32 bits,
but 64-bit 'unsigned long
long' is used internally
in calculations;
SIXTY_FOUR_BIT_LONG bignum limbs are 64 bits
and sizeof(long) is 8;
SIXTY_FOUR_BIT bignums limbs are 64 bits,
but execution environment
is ILP32;
RC4_CHAR RC4 key schedule is made
up of 'unsigned char's;
RC4_INT RC4 key schedule is made
up of 'unsigned int's;
EXPORT_VAR_AS_FN for shared libraries,
export vars as
accessor functions.
apps_aux_src => Extra source to build apps/openssl and other
apps, as needed by the target and that can be
collected in a library.
apps_init_src => Init source to build apps/openssl and other
apps, as needed by the target. This code
cannot be placed in a library, as the rest
of the code isn't expected to link to it
explicitly.
cpuid_asm_src => assembler implementation of cpuid code as
well as OPENSSL_cleanse().
Default to mem_clr.c
bn_asm_src => Assembler implementation of core bignum
functions.
Defaults to bn_asm.c
ec_asm_src => Assembler implementation of core EC
functions.
des_asm_src => Assembler implementation of core DES
encryption functions.
Defaults to 'des_enc.c fcrypt_b.c'
aes_asm_src => Assembler implementation of core AES
functions.
Defaults to 'aes_core.c aes_cbc.c'
bf_asm_src => Assembler implementation of core BlowFish
functions.
Defaults to 'bf_enc.c'
md5_asm_src => Assembler implementation of core MD5
functions.
sha1_asm_src => Assembler implementation of core SHA1,
functions, and also possibly SHA256 and
SHA512 ones.
cast_asm_src => Assembler implementation of core CAST
functions.
Defaults to 'c_enc.c'
rc4_asm_src => Assembler implementation of core RC4
functions.
Defaults to 'rc4_enc.c rc4_skey.c'
rmd160_asm_src => Assembler implementation of core RMD160
functions.
rc5_asm_src => Assembler implementation of core RC5
functions.
Defaults to 'rc5_enc.c'
wp_asm_src => Assembler implementation of core WHIRLPOOL
functions.
cmll_asm_src => Assembler implementation of core CAMELLIA
functions.
Defaults to 'camellia.c cmll_misc.c cmll_cbc.c'
modes_asm_src => Assembler implementation of cipher modes,
currently the functions gcm_gmult_4bit and
gcm_ghash_4bit.
padlock_asm_src => Assembler implementation of core parts of
the padlock engine. This is mandatory on
any platform where the padlock engine might
actually be built.
[1] as part of the target configuration, one can have a key called
'inherit_from' that indicate what other configurations to inherit
data from. These are resolved recursively.
Inheritance works as a set of default values that can be overridden
by corresponding key values in the inheriting configuration.
Note 1: any configuration table can be used as a template.
Note 2: pure templates have the attribute 'template => 1' and
cannot be used as build targets.
If several configurations are given in the 'inherit_from' array,
the values of same attribute are concatenated with space
separation. With this, it's possible to have several smaller
templates for different configuration aspects that can be combined
into a complete configuration.
instead of a scalar value or an array, a value can be a code block
of the form 'sub { /* your code here */ }'. This code block will
be called with the list of inherited values for that key as
arguments. In fact, the concatenation of strings is really done
by using 'sub { join(" ",@_) }' on the list of inherited values.
An example:
"foo" => {
template => 1,
haha => "ha ha",
hoho => "ho",
ignored => "This should not appear in the end result",
},
"bar" => {
template => 1,
haha => "ah",
hoho => "haho",
hehe => "hehe"
},
"laughter" => {
inherit_from => [ "foo", "bar" ],
hehe => sub { join(" ",(@_,"!!!")) },
ignored => "",
}
The entry for "laughter" will become as follows after processing:
"laughter" => {
haha => "ha ha ah",
hoho => "ho haho",
hehe => "hehe !!!",
ignored => ""
}
[2] OpenSSL is built with threading capabilities unless the user
specifies 'no-threads'. The value of the key 'thread_scheme' may
be "(unknown)", in which case the user MUST give some compilation
flags to Configure.
[3] OpenSSL has three types of things to link from object files or
static libraries:
- shared libraries; that would be libcrypto and libssl.
- shared objects (sometimes called dynamic libraries); that would
be the engines.
- applications; those are apps/openssl and all the test apps.
Very roughly speaking, linking is done like this (words in braces
represent the configuration settings documented at the beginning
of this file):
shared libraries:
{ld} $(CFLAGS) {lflags} {shared_ldflag} -o libfoo.so \
foo/something.o foo/somethingelse.o {ex_libs}
shared objects:
{ld} $(CFLAGS) {lflags} {module_ldflags} -o libeng.so \
blah1.o blah2.o -lcrypto {ex_libs}
applications:
{ld} $(CFLAGS) {lflags} -o app \
app1.o utils.o -lssl -lcrypto {ex_libs}
[4] There are variants of these attribute, prefixed with `lib_',
`dso_' or `bin_'. Those variants replace the unprefixed attribute
when building library, DSO or program modules specifically.
Historically, the target configurations came in form of a string with
values separated by colons. This use is deprecated. The string form
looked like this:
"target" => "{cc}:{cflags}:{unistd}:{thread_cflag}:{sys_id}:{lflags}:{bn_ops}:{cpuid_obj}:{bn_obj}:{ec_obj}:{des_obj}:{aes_obj}:{bf_obj}:{md5_obj}:{sha1_obj}:{cast_obj}:{rc4_obj}:{rmd160_obj}:{rc5_obj}:{wp_obj}:{cmll_obj}:{modes_obj}:{padlock_obj}:{perlasm_scheme}:{dso_scheme}:{shared_target}:{shared_cflag}:{shared_ldflag}:{shared_extension}:{ranlib}:{arflags}:{multilib}"
Build info files
================
The build.info files that are spread over the source tree contain the
minimum information needed to build and distribute OpenSSL. It uses a
simple and yet fairly powerful language to determine what needs to be
built, from what sources, and other relationships between files.
For every build.info file, all file references are relative to the
directory of the build.info file for source files, and the
corresponding build directory for built files if the build tree
differs from the source tree.
When processed, every line is processed with the perl module
Text::Template, using the delimiters "{-" and "-}". The hashes
%config and %target are passed to the perl fragments, along with
$sourcedir and $builddir, which are the locations of the source
directory for the current build.info file and the corresponding build
directory, all relative to the top of the build tree.
To begin with, things to be built are declared by setting specific
variables:
PROGRAMS=foo bar
LIBS=libsomething
ENGINES=libeng
SCRIPTS=myhack
EXTRA=file1 file2
Note that the files mentioned for PROGRAMS, LIBS and ENGINES *must* be
without extensions. The build file templates will figure them out.
For each thing to be built, it is then possible to say what sources
they are built from:
PROGRAMS=foo bar
SOURCE[foo]=foo.c common.c
SOURCE[bar]=bar.c extra.c common.c
It's also possible to tell some other dependencies:
DEPEND[foo]=libsomething
DEPEND[libbar]=libsomethingelse
(it could be argued that 'libsomething' and 'libsomethingelse' are
source as well. However, the files given through SOURCE are expected
to be located in the source tree while files given through DEPEND are
expected to be located in the build tree)
It's also possible to depend on static libraries explicitly:
DEPEND[foo]=libsomething.a
DEPEND[libbar]=libsomethingelse.a
This should be rarely used, and care should be taken to make sure it's
only used when supported. For example, native Windows build doesn't
support building static libraries and DLLs at the same time, so using
static libraries on Windows can only be done when configured
'no-shared'.
One some platforms, shared libraries come with a name that's different
from their static counterpart. That's declared as follows:
SHARED_NAME[libfoo]=cygfoo-{- $config{shlibver} -}
The example is from Cygwin, which has a required naming convention.
Sometimes, it makes sense to rename an output file, for example a
library:
RENAME[libfoo]=libbar
That line has "libfoo" renamed to "libbar". While it makes no
sense at all to just have a rename like that (why not just use
"libbar" everywhere?), it does make sense when it can be used
conditionally. See a little further below for an example.
In some cases, it's desirable to include some source files in the
shared form of a library only:
SHARED_SOURCE[libfoo]=dllmain.c
For any file to be built, it's also possible to tell what extra
include paths the build of their source files should use:
INCLUDE[foo]=include
In some cases, one might want to generate some source files from
others, that's done as follows:
GENERATE[foo.s]=asm/something.pl $(CFLAGS)
GENERATE[bar.s]=asm/bar.S
The value of each GENERATE line is a command line or part of it.
Configure places no rules on the command line, except that the first
item must be the generator file. It is, however, entirely up to the
build file template to define exactly how those command lines should
be handled, how the output is captured and so on.
Sometimes, the generator file itself depends on other files, for
example if it is a perl script that depends on other perl modules.
This can be expressed using DEPEND like this:
DEPEND[asm/something.pl]=../perlasm/Foo.pm
There may also be cases where the exact file isn't easily specified,
but an inclusion directory still needs to be specified. INCLUDE can
be used in that case:
INCLUDE[asm/something.pl]=../perlasm
NOTE: GENERATE lines are limited to one command only per GENERATE.
As a last resort, it's possible to have raw build file lines, between
BEGINRAW and ENDRAW lines as follows:
BEGINRAW[Makefile(unix)]
haha.h: {- $builddir -}/Makefile
echo "/* haha */" > haha.h
ENDRAW[Makefile(unix)]
The word within square brackets is the build_file configuration item
or the build_file configuration item followed by the second word in the
build_scheme configuration item for the configured target within
parenthesis as shown above. For example, with the following relevant
configuration items:
build_file => "build.ninja"
build_scheme => [ "unified", "unix" ]
... these lines will be considered:
BEGINRAW[build.ninja]
build haha.h: echo "/* haha */" > haha.h
ENDRAW[build.ninja]
BEGINRAW[build.ninja(unix)]
build hoho.h: echo "/* hoho */" > hoho.h
ENDRAW[build.ninja(unix)]
Should it be needed because the recipes within a RAW section might
clash with those generated by Configure, it's possible to tell it
not to generate them with the use of OVERRIDES, for example:
SOURCE[libfoo]=foo.c bar.c
OVERRIDES=bar.o
BEGINRAW[Makefile(unix)]
bar.o: bar.c
$(CC) $(CFLAGS) -DSPECIAL -c -o $@ $<
ENDRAW[Makefile(unix)]
See the documentation further up for more information on configuration
items.
Finally, you can have some simple conditional use of the build.info
information, looking like this:
IF[1]
something
ELSIF[2]
something other
ELSE
something else
ENDIF
The expression in square brackets is interpreted as a string in perl,
and will be seen as true if perl thinks it is, otherwise false. For
example, the above would have "something" used, since 1 is true.
Together with the use of Text::Template, this can be used as
conditions based on something in the passed variables, for example:
IF[{- $disabled{shared} -}]
LIBS=libcrypto
SOURCE[libcrypto]=...
ELSE
LIBS=libfoo
SOURCE[libfoo]=...
ENDIF
or:
# VMS has a cultural standard where all libraries are prefixed.
# For OpenSSL, the choice is 'ossl_'
IF[{- $config{target} =~ /^vms/ -}]
RENAME[libcrypto]=ossl_libcrypto
RENAME[libssl]=ossl_libssl
ENDIF
Build-file programming with the "unified" build system
======================================================
"Build files" are called "Makefile" on Unix-like operating systems,
"descrip.mms" for MMS on VMS, "makefile" for nmake on Windows, etc.
To use the "unified" build system, the target configuration needs to
set the three items 'build_scheme', 'build_file' and 'build_command'.
In the rest of this section, we will assume that 'build_scheme' is set
to "unified" (see the configurations documentation above for the
details).
For any name given by 'build_file', the "unified" system expects a
template file in Configurations/ named like the build file, with
".tmpl" appended, or in case of possible ambiguity, a combination of
the second 'build_scheme' list item and the 'build_file' name. For
example, if 'build_file' is set to "Makefile", the template could be
Configurations/Makefile.tmpl or Configurations/unix-Makefile.tmpl.
In case both Configurations/unix-Makefile.tmpl and
Configurations/Makefile.tmpl are present, the former takes
precedence.
The build-file template is processed with the perl module
Text::Template, using "{-" and "-}" as delimiters that enclose the
perl code fragments that generate configuration-dependent content.
Those perl fragments have access to all the hash variables from
configdata.pem.
The build-file template is expected to define at least the following
perl functions in a perl code fragment enclosed with "{-" and "-}".
They are all expected to return a string with the lines they produce.
generatesrc - function that produces build file lines to generate
a source file from some input.
It's called like this:
generatesrc(src => "PATH/TO/tobegenerated",
generator => [ "generatingfile", ... ]
generator_incs => [ "INCL/PATH", ... ]
generator_deps => [ "dep1
|