X-Git-Url: https://git.openssl.org/gitweb/?p=openssl.git;a=blobdiff_plain;f=INSTALL;h=ff0aa6d12792482856f8f0f48189bb1e849c82f2;hp=c0163a9371daf9cd7a4ba052381fcc51f5732d26;hb=30c41bfb158c0f595809d0eaf032926a3c2cf236;hpb=dbabc862966b9afbcc55c59cc07ab643a14ffb31

diff --git a/INSTALL b/INSTALL
index c0163a9371..ff0aa6d127 100644
--- a/INSTALL
+++ b/INSTALL
@@ -2,7 +2,8 @@
  --------------------
 
  This document describes installation on all supported operating
- systems (the Linux/Unix family, OpenVMS and Windows)
+ systems (the Unix/Linux family (which includes Mac OS/X), OpenVMS,
+ and Windows).
 
  To install OpenSSL, you will need:
 
@@ -76,7 +77,7 @@
 
  If you want to just get on with it, do:
 
-  on Unix:
+  on Unix (again, this includes Mac OS/X):
 
     $ ./config
     $ make
@@ -144,8 +145,8 @@
                    put together one-size-fits-all instructions. You might
                    have to pass more flags or set up environment variables
                    to actually make it work. Android and iOS cases are
-                   discussed in corresponding Configurations/10-main.cf
-                   sections. But there are cases when this option alone is
+                   discussed in corresponding Configurations/15-*.conf
+                   files. But there are cases when this option alone is
                    sufficient. For example to build the mingw64 target on
                    Linux "--cross-compile-prefix=x86_64-w64-mingw32-"
                    works. Naturally provided that mingw packages are
@@ -156,10 +157,12 @@
                    "--cross-compile-prefix=mipsel-linux-gnu-" suffices
                    in such case. Needless to mention that you have to
                    invoke ./Configure, not ./config, and pass your target
-                   name explicitly.
+                   name explicitly. Also, note that --openssldir refers
+                   to target's file system, not one you are building on.
 
   --debug
-                   Build OpenSSL with debugging symbols.
+                   Build OpenSSL with debugging symbols and zero optimization
+                   level.
 
   --libdir=DIR
                    The name of the directory under the top of the installation
@@ -224,7 +227,8 @@
                    os:         Use a trusted operating system entropy source.
                                This is the default method if such an entropy
                                source exists.
-                   getrandom:  Use the L<getrandom(2)> system call if available.
+                   getrandom:  Use the L<getrandom(2)> or equivalent system
+                               call.
                    devrandom:  Use the the first device from the DEVRANDOM list
                                which can be opened to read random bytes. The
                                DEVRANDOM preprocessor constant expands to
@@ -254,8 +258,10 @@
                    no-shared option.
 
   no-asm
-                   Do not use assembler code. On some platforms a small amount
-                   of assembler code may still be used.
+                   Do not use assembler code. This should be viewed as
+                   debugging/trouble-shooting option rather than production.
+                   On some platforms a small amount of assembler code may
+                   still be used even with this option.
 
   no-async
                    Do not build support for async operations.
@@ -335,8 +341,13 @@
 
   enable-ec_nistp_64_gcc_128
                    Enable support for optimised implementations of some commonly
-                   used NIST elliptic curves. This is only supported on some
-                   platforms.
+                   used NIST elliptic curves.
+                   This is only supported on platforms:
+                   - with little-endian storage of non-byte types
+                   - that tolerate misaligned memory references
+                   - where the compiler:
+                     - supports the non-standard type __uint128_t
+                     - defines the built-in macro __SIZEOF_INT128__
 
   enable-egd
                    Build support for gathering entropy from EGD (Entropy
@@ -465,16 +476,6 @@
                    require additional system-dependent options! See "Note on
                    multi-threading" below.
 
-  enable-tls13downgrade
-                   TODO(TLS1.3): Make this enabled by default and remove the
-                   option when TLSv1.3 is out of draft
-                   TLSv1.3 offers a downgrade protection mechanism. This is
-                   implemented but disabled by default. It should not typically
-                   be enabled except for testing purposes. Otherwise this could
-                   cause problems if a pre-RFC version of OpenSSL talks to an
-                   RFC implementation (it will erroneously be detected as a
-                   downgrade).
-
   no-ts
                    Don't build Time Stamping Authority support.
 
@@ -541,9 +542,9 @@
                    Build without support for the specified algorithm, where
                    <alg> is one of: aria, bf, blake2, camellia, cast, chacha,
                    cmac, des, dh, dsa, ecdh, ecdsa, idea, md4, mdc2, ocb,
-                   poly1305, rc2, rc4, rmd160, scrypt, seed, siphash, sm3, sm4
-                   or whirlpool.  The "ripemd" algorithm is deprecated and if
-                   used is synonymous with rmd160.
+                   poly1305, rc2, rc4, rmd160, scrypt, seed, siphash, sm2, sm3,
+                   sm4 or whirlpool.  The "ripemd" algorithm is deprecated and
+                   if used is synonymous with rmd160.
 
   -Dxxx, -Ixxx, -Wp, -lxxx, -Lxxx, -Wl, -rpath, -R, -framework, -static
                    These system specific options will be recognised and