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Update README.md #56

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Nov 13, 2013
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Update README.md #56

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13 changes: 13 additions & 0 deletions README.md
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Expand Up @@ -162,6 +162,11 @@ You can set the following variables:
- KERL_DEPLOY_RSYNC_OPTIONS if additional options are required, e.g. "--delete"
- KERL_ENABLE_PROMPT if set, the prompt will be prefixed with the name of the active build

Note on .kerlrc
===============

Since .kerlrc is a dot file for /bin/sh, running shell commands inside the .kerlrc will affect the shell and environment variables for the commands being executed later. For example, the shell `export` commands in .kerlrc will affect *your login shell environment* when activating curl. Use with care.

Glossary
========

Expand Down Expand Up @@ -217,6 +222,14 @@ You can enable the use of autoconf in the build process setting KERL_USE_AUTOCON

*Note*: autoconf is always enabled for git builds

#### Using shell export command in .kerlrc

Configure variables which includes spaces such as those in CFLAGS cannot be passed on with KERL_CONFIGURE_OPTIONS. In such a case you can use shell `export` command to define the environment variables for Configure. Note well: this method has a side effect to change your shell execution environment after activating a kerl installation of Erlang/OTP. Here is an example of .kerlrc for building Erlang/OTP for FreeBSD with clang compiler:

# for clang
export CC=clang CXX=clang CFLAGS="-g -O3 -fstack-protector" LDFLAGS="-fstack-protector"
# compilation options
KERL_CONFIGURE_OPTIONS="--disable-native-libs --enable-vm-probes --with-dynamic-trace=dtrace --with-ssl=/usr/local --with-javac --enable-hipe --enable-kernel-poll --with-wx-config=/usr/local/bin/wxgtk2u-2.8-config --without-odbc --enable-threads --enable-sctp --enable-smp-support"

install
-------
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