DKIM: Ed25519 signatures under OpenSSL (1.1.1 or later)

[exim.git] / doc / doc-txt / openssl.txt

diff --git a/doc/doc-txt/openssl.txt b/doc/doc-txt/openssl.txt
index fc2aab0649eebc0cb09e97111de14a5fdb2473b1..93ca701a97a0e1230bdbd3706bc87d0bc85c7d7b 100644 (file)
--- a/doc/doc-txt/openssl.txt
+++ b/doc/doc-txt/openssl.txt
@@ -36,8 +36,9 @@ Extract the current source of OpenSSL.  Change into that directory.
 This assumes that `/opt/openssl` is not in use.  If it is, pick
 something else.  `/opt/exim/openssl` perhaps.
 
-    ./config --prefix=/opt/openssl --openssldir=/etc/ssl
-    enable-ssl-trace
+    ./config --prefix=/opt/openssl --openssldir=/etc/ssl  \
+        -L/opt/openssl/lib -Wl,-R/opt/openssl/lib         \
+        enable-ssl-trace shared
     make
     make install
 
@@ -48,17 +49,21 @@ When you copy `src/EDITME` to `Local/Makefile` to make your build edits,
 choose the pkg-config approach in that file, but also tell Exim to add
 the relevant directory into the rpath stamped into the binary:
 
+    PKG_CONFIG_PATH=/opt/openssl/lib/pkgconfig
+
     SUPPORT_TLS=yes
     USE_OPENSSL_PC=openssl
-    EXTRALIBS_EXIM=-ldl -Wl,-rpath,/opt/openssl/lib
+    LDFLAGS+=-ldl -Wl,-rpath,/opt/openssl/lib
+
+[jgh: I've see /usr/local/lib used]
 
-The -ldl is needed by OpenSSL 1.1+ on Linux and is not needed on most
-other platforms.
+The -ldl is needed by OpenSSL 1.0.2+ on Linux and is not needed on most
+other platforms.  The LDFLAGS is needed because `pkg-config` doesn't know
+how to emit information about RPATH-stamping, but we can still leverage
+`pkg-config` for everything else.
 
-Then tell pkg-config how to find the configuration files for your new
-OpenSSL install, and build Exim:
+Then build Exim:
 
-    export PKG_CONFIG_PATH=/opt/openssl/lib/pkgconfig
     make
     sudo make install
 
@@ -86,6 +91,12 @@ If the `chrpath` package is installed, then:
 
 will show the DT_RPATH stamped into the binary.
 
+Your `binutils` package should come with `readelf`, so an alternative
+is to run:
+
+    readelf -d $(which exim) | grep RPATH
+
+[jgh: I've seen that spelled RUNPATH]
 
 Very Advanced
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