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
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温馨提示
OpenSSL is licensed under an Apache-style license, which basically means that you are free to get and use it for commercial and non-commercial purposes subject to some simple license conditions. OpenSSL是一个开放源代码的软件库包,应用程序可以使用这个包来进行安全通信,避免窃听,同时确认另一端连接者的身份。这个包广泛被应用在互联网的网页服务器上。 SSL能使用户/服务器应用之间的通信不被攻击者窃听,并且始终对服务器进行认证,还可选择对用户进行认证。SSL协议要求建立在可靠的传输层协议(TCP)之上。SSL协议的优势在于它是与应用层协议独立无关的,高层的应用层协议(例如:HTTP,FTP,TELNET等)能透明地建立于SSL协议之上。SSL协议在应用层协议通信之前就已经完成加密算法、通信密钥的协商及服务器认证工作。在此之后应用层协议所传送的数据都会被加密,从而保证通信的私密性。
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