4 This directory contains a few sets of files that are used for
5 configuration in diverse ways:
7 *.conf Target platform configurations, please read
8 'Configurations of OpenSSL target platforms' for more
10 *.tmpl Build file templates, please read 'Build-file
11 programming with the "unified" build system' as well
12 as 'Build info files' for more information.
13 *.pm Helper scripts / modules for the main `Configure`
14 script. See 'Configure helper scripts for more
18 Configurations of OpenSSL target platforms
19 ==========================================
21 Configuration targets are a collection of facts that we know about
22 different platforms and their capabilities. We organise them in a
23 hash table, where each entry represent a specific target.
25 Note that configuration target names must be unique across all config
26 files. The Configure script does check that a config file doesn't
27 have config targets that shadow config targets from other files.
29 In each table entry, the following keys are significant:
31 inherit_from => Other targets to inherit values from.
32 Explained further below. [1]
33 template => Set to 1 if this isn't really a platform
34 target. Instead, this target is a template
35 upon which other targets can be built.
36 Explained further below. [1]
38 sys_id => System identity for systems where that
39 is difficult to determine automatically.
41 enable => Enable specific configuration features.
42 This MUST be an array of words.
43 disable => Disable specific configuration features.
44 This MUST be an array of words.
45 Note: if the same feature is both enabled
46 and disabled, disable wins.
48 as => The assembler command. This is not always
49 used (for example on Unix, where the C
50 compiler is used instead).
51 asflags => Default assembler command flags [4].
52 cpp => The C preprocessor command, normally not
53 given, as the build file defaults are
55 cppflags => Default C preprocessor flags [4].
56 defines => As an alternative, macro definitions may be
57 given here instead of in `cppflags' [4].
58 If given here, they MUST be as an array of
59 the string such as "MACRO=value", or just
60 "MACRO" for definitions without value.
61 includes => As an alternative, inclusion directories
62 may be given here instead of in `cppflags'
63 [4]. If given here, the MUST be an array
64 of strings, one directory specification
66 cc => The C compiler command, usually one of "cc",
67 "gcc" or "clang". This command is normally
68 also used to link object files and
69 libraries into the final program.
70 cxx => The C++ compiler command, usually one of
71 "c++", "g++" or "clang++". This command is
72 also used when linking a program where at
73 least one of the object file is made from
75 cflags => Defaults C compiler flags [4].
76 cxxflags => Default C++ compiler flags [4]. If unset,
77 it gets the same value as cflags.
79 (linking is a complex thing, see [3] below)
80 ld => Linker command, usually not defined
81 (meaning the compiler command is used
83 (NOTE: this is here for future use, it's
85 lflags => Default flags used when linking apps,
86 shared libraries or DSOs [4].
87 ex_libs => Extra libraries that are needed when
88 linking shared libraries, DSOs or programs.
89 The value is also assigned to Libs.private
90 in $(libdir)/pkgconfig/libcrypto.pc.
92 shared_cppflags => Extra C preprocessor flags used when
93 processing C files for shared libraries.
94 shared_cflag => Extra C compiler flags used when compiling
95 for shared libraries, typically something
97 shared_ldflag => Extra linking flags used when linking
101 module_ldflags => Has the same function as the corresponding
102 `shared_' attributes, but for building DSOs.
103 When unset, they get the same values as the
104 corresponding `shared_' attributes.
106 ar => The library archive command, the default is
108 (NOTE: this is here for future use, it's
110 arflags => Flags to be used with the library archive
111 command. On Unix, this includes the
112 command letter, 'r' by default.
114 ranlib => The library archive indexing command, the
115 default is 'ranlib' it it exists.
117 unistd => An alternative header to the typical
118 '<unistd.h>'. This is very rarely needed.
120 shared_extension => File name extension used for shared
122 obj_extension => File name extension used for object files.
123 On unix, this defaults to ".o" (NOTE: this
124 is here for future use, it's not
126 exe_extension => File name extension used for executable
127 files. On unix, this defaults to "" (NOTE:
128 this is here for future use, it's not
130 shlib_variant => A "variant" identifier inserted between the base
131 shared library name and the extension. On "unixy"
132 platforms (BSD, Linux, Solaris, MacOS/X, ...) this
133 supports installation of custom OpenSSL libraries
134 that don't conflict with other builds of OpenSSL
135 installed on the system. The variant identifier
136 becomes part of the SONAME of the library and also
137 any symbol versions (symbol versions are not used or
138 needed with MacOS/X). For example, on a system
139 where a default build would normally create the SSL
140 shared library as 'libssl.so -> libssl.so.1.1' with
141 the value of the symlink as the SONAME, a target
142 definition that sets 'shlib_variant => "-abc"' will
143 create 'libssl.so -> libssl-abc.so.1.1', again with
144 an SONAME equal to the value of the symlink. The
145 symbol versions associated with the variant library
146 would then be 'OPENSSL_ABC_<version>' rather than
147 the default 'OPENSSL_<version>'. The string inserted
148 into symbol versions is obtained by mapping all
149 letters in the "variant" identifier to upper case
150 and all non-alphanumeric characters to '_'.
152 thread_scheme => The type of threads is used on the
153 configured platform. Currently known
154 values are "(unknown)", "pthreads",
155 "uithreads" (a.k.a solaris threads) and
156 "winthreads". Except for "(unknown)", the
157 actual value is currently ignored but may
158 be used in the future. See further notes
160 dso_scheme => The type of dynamic shared objects to build
161 for. This mostly comes into play with
162 engines, but can be used for other purposes
163 as well. Valid values are "DLFCN"
164 (dlopen() et al), "DLFCN_NO_H" (for systems
165 that use dlopen() et al but do not have
166 fcntl.h), "DL" (shl_load() et al), "WIN32"
168 perlasm_scheme => The perlasm method used to create the
169 assembler files used when compiling with
170 assembler implementations.
171 shared_target => The shared library building method used.
172 This serves multiple purposes:
173 - as index for targets found in shared_info.pl.
174 - as linker script generation selector.
175 To serve both purposes, the index for shared_info.pl
176 should end with '-shared', and this suffix will be
177 removed for use as a linker script generation
178 selector. Note that the latter is only used if
179 'shared_defflag' is defined.
180 build_scheme => The scheme used to build up a Makefile.
181 In its simplest form, the value is a string
182 with the name of the build scheme.
183 The value may also take the form of a list
184 of strings, if the build_scheme is to have
185 some options. In this case, the first
186 string in the list is the name of the build
188 Currently recognised build scheme is "unified".
189 For the "unified" build scheme, this item
190 *must* be an array with the first being the
191 word "unified" and the second being a word
192 to identify the platform family.
194 multilib => On systems that support having multiple
195 implementations of a library (typically a
196 32-bit and a 64-bit variant), this is used
197 to have the different variants in different
200 bn_ops => Building options (was just bignum options in
201 the earlier history of this option, hence the
202 name). This is a string of words that describe
203 algorithms' implementation parameters that
204 are optimal for the designated target platform,
205 such as the type of integers used to build up
206 the bignum, different ways to implement certain
207 ciphers and so on. To fully comprehend the
208 meaning, the best is to read the affected
212 THIRTY_TWO_BIT bignum limbs are 32 bits,
213 this is default if no
214 option is specified, it
215 works on any supported
216 system [unless "wider"
217 limb size is implied in
219 BN_LLONG bignum limbs are 32 bits,
220 but 64-bit 'unsigned long
221 long' is used internally
223 SIXTY_FOUR_BIT_LONG bignum limbs are 64 bits
224 and sizeof(long) is 8;
225 SIXTY_FOUR_BIT bignums limbs are 64 bits,
226 but execution environment
228 RC4_CHAR RC4 key schedule is made
229 up of 'unsigned char's;
230 RC4_INT RC4 key schedule is made
231 up of 'unsigned int's;
232 EXPORT_VAR_AS_FN for shared libraries,
236 apps_aux_src => Extra source to build apps/openssl and other
237 apps, as needed by the target and that can be
238 collected in a library.
239 apps_init_src => Init source to build apps/openssl and other
240 apps, as needed by the target. This code
241 cannot be placed in a library, as the rest
242 of the code isn't expected to link to it
244 cpuid_asm_src => assembler implementation of cpuid code as
245 well as OPENSSL_cleanse().
247 bn_asm_src => Assembler implementation of core bignum
250 ec_asm_src => Assembler implementation of core EC
252 des_asm_src => Assembler implementation of core DES
253 encryption functions.
254 Defaults to 'des_enc.c fcrypt_b.c'
255 aes_asm_src => Assembler implementation of core AES
257 Defaults to 'aes_core.c aes_cbc.c'
258 bf_asm_src => Assembler implementation of core BlowFish
260 Defaults to 'bf_enc.c'
261 md5_asm_src => Assembler implementation of core MD5
263 sha1_asm_src => Assembler implementation of core SHA1,
264 functions, and also possibly SHA256 and
266 cast_asm_src => Assembler implementation of core CAST
268 Defaults to 'c_enc.c'
269 rc4_asm_src => Assembler implementation of core RC4
271 Defaults to 'rc4_enc.c rc4_skey.c'
272 rmd160_asm_src => Assembler implementation of core RMD160
274 rc5_asm_src => Assembler implementation of core RC5
276 Defaults to 'rc5_enc.c'
277 wp_asm_src => Assembler implementation of core WHIRLPOOL
279 cmll_asm_src => Assembler implementation of core CAMELLIA
281 Defaults to 'camellia.c cmll_misc.c cmll_cbc.c'
282 modes_asm_src => Assembler implementation of cipher modes,
283 currently the functions gcm_gmult_4bit and
285 padlock_asm_src => Assembler implementation of core parts of
286 the padlock engine. This is mandatory on
287 any platform where the padlock engine might
291 [1] as part of the target configuration, one can have a key called
292 'inherit_from' that indicate what other configurations to inherit
293 data from. These are resolved recursively.
295 Inheritance works as a set of default values that can be overridden
296 by corresponding key values in the inheriting configuration.
298 Note 1: any configuration table can be used as a template.
299 Note 2: pure templates have the attribute 'template => 1' and
300 cannot be used as build targets.
302 If several configurations are given in the 'inherit_from' array,
303 the values of same attribute are concatenated with space
304 separation. With this, it's possible to have several smaller
305 templates for different configuration aspects that can be combined
306 into a complete configuration.
308 instead of a scalar value or an array, a value can be a code block
309 of the form 'sub { /* your code here */ }'. This code block will
310 be called with the list of inherited values for that key as
311 arguments. In fact, the concatenation of strings is really done
312 by using 'sub { join(" ",@_) }' on the list of inherited values.
320 ignored => "This should not appear in the end result",
329 inherit_from => [ "foo", "bar" ],
330 hehe => sub { join(" ",(@_,"!!!")) },
334 The entry for "laughter" will become as follows after processing:
343 [2] OpenSSL is built with threading capabilities unless the user
344 specifies 'no-threads'. The value of the key 'thread_scheme' may
345 be "(unknown)", in which case the user MUST give some compilation
348 [3] OpenSSL has three types of things to link from object files or
351 - shared libraries; that would be libcrypto and libssl.
352 - shared objects (sometimes called dynamic libraries); that would
354 - applications; those are apps/openssl and all the test apps.
356 Very roughly speaking, linking is done like this (words in braces
357 represent the configuration settings documented at the beginning
361 {ld} $(CFLAGS) {lflags} {shared_ldflag} -o libfoo.so \
362 foo/something.o foo/somethingelse.o {ex_libs}
365 {ld} $(CFLAGS) {lflags} {module_ldflags} -o libeng.so \
366 blah1.o blah2.o -lcrypto {ex_libs}
369 {ld} $(CFLAGS) {lflags} -o app \
370 app1.o utils.o -lssl -lcrypto {ex_libs}
372 [4] There are variants of these attribute, prefixed with `lib_',
373 `dso_' or `bin_'. Those variants replace the unprefixed attribute
374 when building library, DSO or program modules specifically.
376 Historically, the target configurations came in form of a string with
377 values separated by colons. This use is deprecated. The string form
380 "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}"
386 The build.info files that are spread over the source tree contain the
387 minimum information needed to build and distribute OpenSSL. It uses a
388 simple and yet fairly powerful language to determine what needs to be
389 built, from what sources, and other relationships between files.
391 For every build.info file, all file references are relative to the
392 directory of the build.info file for source files, and the
393 corresponding build directory for built files if the build tree
394 differs from the source tree.
396 When processed, every line is processed with the perl module
397 Text::Template, using the delimiters "{-" and "-}". The hashes
398 %config and %target are passed to the perl fragments, along with
399 $sourcedir and $builddir, which are the locations of the source
400 directory for the current build.info file and the corresponding build
401 directory, all relative to the top of the build tree.
403 To begin with, things to be built are declared by setting specific
412 Note that the files mentioned for PROGRAMS, LIBS and ENGINES *must* be
413 without extensions. The build file templates will figure them out.
415 For each thing to be built, it is then possible to say what sources
419 SOURCE[foo]=foo.c common.c
420 SOURCE[bar]=bar.c extra.c common.c
422 It's also possible to tell some other dependencies:
424 DEPEND[foo]=libsomething
425 DEPEND[libbar]=libsomethingelse
427 (it could be argued that 'libsomething' and 'libsomethingelse' are
428 source as well. However, the files given through SOURCE are expected
429 to be located in the source tree while files given through DEPEND are
430 expected to be located in the build tree)
432 It's also possible to depend on static libraries explicitly:
434 DEPEND[foo]=libsomething.a
435 DEPEND[libbar]=libsomethingelse.a
437 This should be rarely used, and care should be taken to make sure it's
438 only used when supported. For example, native Windows build doesn't
439 support building static libraries and DLLs at the same time, so using
440 static libraries on Windows can only be done when configured
443 One some platforms, shared libraries come with a name that's different
444 from their static counterpart. That's declared as follows:
446 SHARED_NAME[libfoo]=cygfoo-{- $config{shlibver} -}
448 The example is from Cygwin, which has a required naming convention.
450 Sometimes, it makes sense to rename an output file, for example a
453 RENAME[libfoo]=libbar
455 That line has "libfoo" renamed to "libbar". While it makes no
456 sense at all to just have a rename like that (why not just use
457 "libbar" everywhere?), it does make sense when it can be used
458 conditionally. See a little further below for an example.
460 In some cases, it's desirable to include some source files in the
461 shared form of a library only:
463 SHARED_SOURCE[libfoo]=dllmain.c
465 For any file to be built, it's also possible to tell what extra
466 include paths the build of their source files should use:
470 In some cases, one might want to generate some source files from
471 others, that's done as follows:
473 GENERATE[foo.s]=asm/something.pl $(CFLAGS)
474 GENERATE[bar.s]=asm/bar.S
476 The value of each GENERATE line is a command line or part of it.
477 Configure places no rules on the command line, except that the first
478 item must be the generator file. It is, however, entirely up to the
479 build file template to define exactly how those command lines should
480 be handled, how the output is captured and so on.
482 Sometimes, the generator file itself depends on other files, for
483 example if it is a perl script that depends on other perl modules.
484 This can be expressed using DEPEND like this:
486 DEPEND[asm/something.pl]=../perlasm/Foo.pm
488 There may also be cases where the exact file isn't easily specified,
489 but an inclusion directory still needs to be specified. INCLUDE can
490 be used in that case:
492 INCLUDE[asm/something.pl]=../perlasm
494 NOTE: GENERATE lines are limited to one command only per GENERATE.
496 As a last resort, it's possible to have raw build file lines, between
497 BEGINRAW and ENDRAW lines as follows:
499 BEGINRAW[Makefile(unix)]
500 haha.h: {- $builddir -}/Makefile
501 echo "/* haha */" > haha.h
502 ENDRAW[Makefile(unix)]
504 The word within square brackets is the build_file configuration item
505 or the build_file configuration item followed by the second word in the
506 build_scheme configuration item for the configured target within
507 parenthesis as shown above. For example, with the following relevant
510 build_file => "build.ninja"
511 build_scheme => [ "unified", "unix" ]
513 ... these lines will be considered:
515 BEGINRAW[build.ninja]
516 build haha.h: echo "/* haha */" > haha.h
519 BEGINRAW[build.ninja(unix)]
520 build hoho.h: echo "/* hoho */" > hoho.h
521 ENDRAW[build.ninja(unix)]
523 Should it be needed because the recipes within a RAW section might
524 clash with those generated by Configure, it's possible to tell it
525 not to generate them with the use of OVERRIDES, for example:
527 SOURCE[libfoo]=foo.c bar.c
530 BEGINRAW[Makefile(unix)]
532 $(CC) $(CFLAGS) -DSPECIAL -c -o $@ $<
533 ENDRAW[Makefile(unix)]
535 See the documentation further up for more information on configuration
538 Finally, you can have some simple conditional use of the build.info
539 information, looking like this:
549 The expression in square brackets is interpreted as a string in perl,
550 and will be seen as true if perl thinks it is, otherwise false. For
551 example, the above would have "something" used, since 1 is true.
553 Together with the use of Text::Template, this can be used as
554 conditions based on something in the passed variables, for example:
556 IF[{- $disabled{shared} -}]
558 SOURCE[libcrypto]=...
566 # VMS has a cultural standard where all libraries are prefixed.
567 # For OpenSSL, the choice is 'ossl_'
568 IF[{- $config{target} =~ /^vms/ -}]
569 RENAME[libcrypto]=ossl_libcrypto
570 RENAME[libssl]=ossl_libssl
574 Build-file programming with the "unified" build system
575 ======================================================
577 "Build files" are called "Makefile" on Unix-like operating systems,
578 "descrip.mms" for MMS on VMS, "makefile" for nmake on Windows, etc.
580 To use the "unified" build system, the target configuration needs to
581 set the three items 'build_scheme', 'build_file' and 'build_command'.
582 In the rest of this section, we will assume that 'build_scheme' is set
583 to "unified" (see the configurations documentation above for the
586 For any name given by 'build_file', the "unified" system expects a
587 template file in Configurations/ named like the build file, with
588 ".tmpl" appended, or in case of possible ambiguity, a combination of
589 the second 'build_scheme' list item and the 'build_file' name. For
590 example, if 'build_file' is set to "Makefile", the template could be
591 Configurations/Makefile.tmpl or Configurations/unix-Makefile.tmpl.
592 In case both Configurations/unix-Makefile.tmpl and
593 Configurations/Makefile.tmpl are present, the former takes
596 The build-file template is processed with the perl module
597 Text::Template, using "{-" and "-}" as delimiters that enclose the
598 perl code fragments that generate configuration-dependent content.
599 Those perl fragments have access to all the hash variables from
602 The build-file template is expected to define at least the following
603 perl functions in a perl code fragment enclosed with "{-" and "-}".
604 They are all expected to return a string with the lines they produce.
606 generatesrc - function that produces build file lines to generate
607 a source file from some input.
609 It's called like this:
611 generatesrc(src => "PATH/TO/tobegenerated",
612 generator => [ "generatingfile", ... ]
613 generator_incs => [ "INCL/PATH", ... ]
614 generator_deps => [ "dep1", ... ]
615 generator => [ "generatingfile", ... ]
616 incs => [ "INCL/PATH", ... ],
617 deps => [ "dep1", ... ],
618 intent => one of "libs", "dso", "bin" );
620 'src' has the name of the file to be generated.
621 'generator' is the command or part of command to
622 generate the file, of which the first item is
623 expected to be the file to generate from.
624 generatesrc() is expected to analyse and figure out
625 exactly how to apply that file and how to capture
626 the result. 'generator_incs' and 'generator_deps'
627 are include directories and files that the generator
628 file itself depends on. 'incs' and 'deps' are
629 include directories and files that are used if $(CC)
630 is used as an intermediary step when generating the
631 end product (the file indicated by 'src'). 'intent'
632 indicates what the generated file is going to be
635 src2obj - function that produces build file lines to build an
636 object file from source files and associated data.
638 It's called like this:
640 src2obj(obj => "PATH/TO/objectfile",
641 srcs => [ "PATH/TO/sourcefile", ... ],
642 deps => [ "dep1", ... ],
643 incs => [ "INCL/PATH", ... ]
644 intent => one of "lib", "dso", "bin" );
646 'obj' has the intended object file with '.o'
647 extension, src2obj() is expected to change it to
648 something more suitable for the platform.
649 'srcs' has the list of source files to build the
650 object file, with the first item being the source
651 file that directly corresponds to the object file.
652 'deps' is a list of explicit dependencies. 'incs'
653 is a list of include file directories. Finally,
654 'intent' indicates what this object file is going
657 obj2lib - function that produces build file lines to build a
658 static library file ("libfoo.a" in Unix terms) from
663 obj2lib(lib => "PATH/TO/libfile",
664 objs => [ "PATH/TO/objectfile", ... ]);
666 'lib' has the intended library file name *without*
667 extension, obj2lib is expected to add that. 'objs'
668 has the list of object files to build this library.
670 libobj2shlib - backward compatibility function that's used the
671 same way as obj2shlib (described next), and was
672 expected to build the shared library from the
673 corresponding static library when that was suitable.
674 NOTE: building a shared library from a static
675 library is now DEPRECATED, as they no longer share
676 object files. Attempting to do this will fail.
678 obj2shlib - function that produces build file lines to build a
679 shareable object library file ("libfoo.so" in Unix
680 terms) from the corresponding object files.
684 obj2shlib(shlib => "PATH/TO/shlibfile",
685 lib => "PATH/TO/libfile",
686 objs => [ "PATH/TO/objectfile", ... ],
687 deps => [ "PATH/TO/otherlibfile", ... ]);
689 'lib' has the base (static) library ffile name
690 *without* extension. This is useful in case
691 supporting files are needed (such as import
692 libraries on Windows).
693 'shlib' has the corresponding shared library name
694 *without* extension. 'deps' has the list of other
695 libraries (also *without* extension) this library
696 needs to be linked with. 'objs' has the list of
697 object files to build this library.
699 obj2dso - function that produces build file lines to build a
700 dynamic shared object file from object files.
704 obj2dso(lib => "PATH/TO/libfile",
705 objs => [ "PATH/TO/objectfile", ... ],
706 deps => [ "PATH/TO/otherlibfile",
709 This is almost the same as obj2shlib, but the
710 intent is to build a shareable library that can be
711 loaded in runtime (a "plugin"...).
713 obj2bin - function that produces build file lines to build an
714 executable file from object files.
718 obj2bin(bin => "PATH/TO/binfile",
719 objs => [ "PATH/TO/objectfile", ... ],
720 deps => [ "PATH/TO/libfile", ... ]);
722 'bin' has the intended executable file name
723 *without* extension, obj2bin is expected to add
724 that. 'objs' has the list of object files to build
725 this library. 'deps' has the list of library files
726 (also *without* extension) that the programs needs
729 in2script - function that produces build file lines to build a
730 script file from some input.
734 in2script(script => "PATH/TO/scriptfile",
735 sources => [ "PATH/TO/infile", ... ]);
737 'script' has the intended script file name.
738 'sources' has the list of source files to build the
739 resulting script from.
741 In all cases, file file paths are relative to the build tree top, and
742 the build file actions run with the build tree top as current working
745 Make sure to end the section with these functions with a string that
746 you thing is appropriate for the resulting build file. If nothing
747 else, end it like this:
749 ""; # Make sure no lingering values end up in the Makefile
753 Configure helper scripts
754 ========================
756 Configure uses helper scripts in this directory:
761 These scripts are per platform family, to check the integrity of the
762 tools used for configuration and building. The checker script used is
763 either {build_platform}-{build_file}-checker.pm or
764 {build_platform}-checker.pm, where {build_platform} is the second
765 'build_scheme' list element from the configuration target data, and
766 {build_file} is 'build_file' from the same target data.
768 If the check succeeds, the script is expected to end with a non-zero
769 expression. If the check fails, the script can end with a zero, or