diff options
Diffstat (limited to 'make.html.markdown')
| -rw-r--r-- | make.html.markdown | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/make.html.markdown b/make.html.markdown index e8cfd2b5..ab128475 100644 --- a/make.html.markdown +++ b/make.html.markdown @@ -9,16 +9,16 @@ A Makefile defines a graph of rules for creating a target (or targets). Its purpose is to do the minimum amount of work needed to update a
target to the most recent version of the source. Famously written over a
weekend by Stuart Feldman in 1976, it is still widely used (particularly
-on Unix) despite many competitors and criticisms.
+on Unix and Linux) despite many competitors and criticisms.
-There are many varieties of make in existance, this article assumes that
-we are using GNU make which is the standard on Linux.
+There are many varieties of make in existence, however this article
+assumes that we are using GNU make which is the standard on Linux.
```make
# Comments can be written like this.
-# Files should be named Makefile and then be can run as `make <target>`.
+# File should be named Makefile and then can be run as `make <target>`.
# Otherwise we use `make -f "filename" <target>`.
# Warning - only use TABS to indent in Makefiles, never spaces!
@@ -27,13 +27,16 @@ we are using GNU make which is the standard on Linux. # Basics
#-----------------------------------------------------------------------
+# Rules are of the format
+# target: <prerequisite>
+# where prerequisites are optional.
+
# A rule - this rule will only run if file0.txt doesn't exist.
file0.txt:
echo "foo" > file0.txt
# Even comments in these 'recipe' sections get passed to the shell.
# Try `make file0.txt` or simply `make` - first rule is the default.
-
# This rule will only run if file0.txt is newer than file1.txt.
file1.txt: file0.txt
cat file0.txt > file1.txt
@@ -99,8 +102,8 @@ process: ex1.txt file0.txt %.png: %.svg
inkscape --export-png $^
-# Pattern rules will only do anything if make decides to create the \
-target.
+# Pattern rules will only do anything if make decides to create the
+# target.
# Directory paths are normally ignored when matching pattern rules. But
# make will try to use the most appropriate rule available.
@@ -145,11 +148,11 @@ echo: # In order of priority from highest to lowest:
# 1: commandline arguments
# 2: Makefile
-# 3: shell enviroment variables - make imports these automatically.
+# 3: shell environment variables - make imports these automatically.
# 4: make has some predefined variables
name4 ?= Jean
-# Only set the variable if enviroment variable is not already defined.
+# Only set the variable if environment variable is not already defined.
override name5 = David
# Stops commandline arguments from changing this variable.
@@ -185,7 +188,7 @@ var := hello var2 ::= $(var) hello
#:= and ::= are equivalent.
-# These variables are evaluated procedurely (in the order that they
+# These variables are evaluated procedurally (in the order that they
# appear), thus breaking with the rest of the language !
# This doesn't work
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