Add automatic macros for compile-time feature options

[exim.git] / src / OS / Makefile-Linux

diff --git a/src/OS/Makefile-Linux b/src/OS/Makefile-Linux
index d933c056a541d0ef3837aa42205dd9535ad7bc8c..990f884e9cb2b33ac3ce734986c461312b21449e 100644 (file)
--- a/src/OS/Makefile-Linux
+++ b/src/OS/Makefile-Linux
@@ -1,20 +1,25 @@
-# $Cambridge: exim/src/OS/Makefile-Linux,v 1.1 2004/10/06 15:07:39 ph10 Exp $
-
 # Exim: OS-specific make file for Linux. This is for modern Linuxes,
 # which use libc6.
+#
+# For Linux, we assume GNU Make; at time of writing, the only extension
+# used is ?= which is actually portable to other maintained Make variants,
+# just is not POSIX.
 
 HAVE_ICONV=yes
 
 BASENAME_COMMAND=look_for_it
 CHOWN_COMMAND=look_for_it
 CHGRP_COMMAND=look_for_it
+CHMOD_COMMAND=look_for_it
 
-CFLAGS=-O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+# Preserve CFLAGS and CFLAGS_DYNAMIC from the caller/environment
+CFLAGS ?= -O -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
+CFLAGS_DYNAMIC ?= -shared -rdynamic
 
 DBMLIB = -ldb
 USE_DB = yes
 
-LIBS = -lnsl -lcrypt
+LIBS = -lnsl -lcrypt -lm
 LIBRESOLV = -lresolv
 
 X11=/usr/X11R6