mirror of https://github.com/openssl/openssl
INSTALL: clarify 386 and no-sse2 options.
Reviewed-by: Rich Salz <rsalz@openssl.org> Reviewed-by: Richard Levitte <levitte@openssl.org>
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@ -60,11 +60,12 @@ my $usage="Usage: Configure [no-<cipher> ...] [enable-<cipher> ...] [-Dxxx] [-lx
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# zlib-dynamic Like "zlib", but the zlib library is expected to be a shared
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# library and will be loaded in run-time by the OpenSSL library.
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# sctp include SCTP support
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# 386 generate 80386 code
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# enable-weak-ssl-ciphers
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# Enable weak ciphers that are disabled by default. This currently
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# only includes RC4 based ciphers.
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# no-sse2 disables IA-32 SSE2 code, above option implies no-sse2
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# 386 generate 80386 code in assembly modules
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# no-sse2 disables IA-32 SSE2 code in assembly modules, the above
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# mentioned '386' option implies this one
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# no-<cipher> build without specified algorithm (rsa, idea, rc5, ...)
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# -<xxx> +<xxx> compiler options are passed through
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# -static while -static is also a pass-through compiler option (and
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44
INSTALL
44
INSTALL
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@ -383,19 +383,19 @@
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Don't build SRTP support
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no-sse2
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Exclude SSE2 code paths. Normally SSE2 extension is
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detected at run-time, but the decision whether or not the
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machine code will be executed is taken solely on CPU
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capability vector. This means that if you happen to run OS
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kernel which does not support SSE2 extension on Intel P4
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processor, then your application might be exposed to
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"illegal instruction" exception. There might be a way
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to enable support in kernel, e.g. FreeBSD kernel can be
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compiled with CPU_ENABLE_SSE, and there is a way to
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disengage SSE2 code paths upon application start-up,
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but if you aim for wider "audience" running such kernel,
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consider no-sse2. Both the 386 and no-asm options imply
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no-sse2.
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Exclude SSE2 code paths from 32-bit x86 assembly modules.
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Normally SSE2 extension is detected at run-time, but the
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decision whether or not the machine code will be executed
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is taken solely on CPU capability vector. This means that
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if you happen to run OS kernel which does not support SSE2
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extension on Intel P4 processor, then your application
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might be exposed to "illegal instruction" exception.
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There might be a way to enable support in kernel, e.g.
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FreeBSD kernel can be compiled with CPU_ENABLE_SSE, and
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there is a way to disengage SSE2 code paths upon application
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start-up, but if you aim for wider "audience" running
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such kernel, consider no-sse2. Both the 386 and
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no-asm options imply no-sse2.
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enable-ssl-trace
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Build with the SSL Trace capabilities (adds the "-trace"
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@ -458,11 +458,12 @@
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where loading of shared libraries is supported.
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386
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On Intel hardware, use the 80386 instruction set only
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(the default x86 code is more efficient, but requires at
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least a 486). Note: Use compiler flags for any other CPU
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specific configuration, e.g. "-m32" to build x86 code on
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an x64 system.
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In 32-bit x86 builds, when generating assembly modules,
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use the 80386 instruction set only (the default x86 code
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is more efficient, but requires at least a 486). Note:
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This doesn't affect code generated by compiler, you're
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likely to complement configuration command line with
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suitable compiler-specific option.
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enable-tls1_3
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TODO(TLS1.3): Make this enabled by default
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@ -500,7 +501,12 @@
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These system specific options will be passed through to the
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compiler to allow you to define preprocessor symbols, specify
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additional libraries, library directories or other compiler
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options.
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options. It might be worth noting that some compilers
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generate code specifically for processor the compiler
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currently executes on. This is not necessarily what you might
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have in mind, since it might be unsuitable for execution on
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other, typically older, processor. Consult your compiler
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documentation.
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Installation in Detail
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