Fix: Use env CLASSPATH when building log4j example

[lttng-ust.git] / doc / examples / java-log4j / Makefile

diff --git a/doc/examples/java-log4j/Makefile b/doc/examples/java-log4j/Makefile
index 4b5996422c6f3768f184033fecf8f1f04997ea8c..2c629c37efe0fb23f03cf7d0966942319c8c7676 100644 (file)
--- a/doc/examples/java-log4j/Makefile
+++ b/doc/examples/java-log4j/Makefile
@@ -20,7 +20,11 @@ JFLAGS = -g
 
 # Default JUL jar name.
 JARFILE=liblttng-ust-agent.jar
-LOG4J=/usr/share/java/log4j.jar
+
+# If system classpath is empty, try to guess log4j location
+ifeq "$(CLASSPATH)" ""
+       CLASSPATH="/usr/local/share/java/log4j.jar:/usr/share/java/log4j.jar"
+endif
 
 # Check if the top level makefile overrides the JUL Jar file name.
 ifneq "$(JAVA_JARFILE_OVERRIDE)" ""
@@ -29,9 +33,9 @@ endif
 
 # Check if the top level makefile overrides the JUL classpath.
 ifeq "$(JAVA_CLASSPATH_OVERRIDE)" ""
-       CLASSPATH=/usr/local/share/java/$(JARFILE):/usr/share/java/$(JARFILE):$(LOG4J)
+       CLASSPATH:=/usr/local/share/java/$(JARFILE):/usr/share/java/$(JARFILE):$(CLASSPATH)
 else
-       CLASSPATH=$(JAVA_CLASSPATH_OVERRIDE)/$(JARFILE):$(LOG4J)
+       CLASSPATH:=$(JAVA_CLASSPATH_OVERRIDE)/$(JARFILE):$(CLASSPATH)
 endif
 
 JC = javac -classpath "$(CLASSPATH):."