What does .suffixes mean in makefile?
Suffix rules are the old-fashioned way of defining implicit rules for make . Suffix rules are obsolete because pattern rules are more general and clearer. They are supported in GNU make for compatibility with old makefiles. They come in two kinds: double-suffix and single-suffix.
What does o mean in makefile?
object file
The first line in your question is just a standard Makefile rule. vpath.o: make.h config.h getopt.h gettext.h dep.h. A .o file is an object file; it’s an intermediate product in between your source files and the final compiled binary.
What is Cflags in makefile?
CFLAGS and CXXFLAGS are either the name of environment variables or of Makefile variables that can be set to specify additional switches to be passed to a compiler in the process of building computer software.
What does the special symbol mean in makefile $@ $
Inside actions we can use: $@ to represent the full target name of the current target $? returns the dependencies that are newer than the current target $* returns the text that corresponds to % in the target $< returns the name of the first dependency $^ returns the names of all the dependencies with space as the …
Can you have multiple rules in a makefile?
There can only be one recipe to be executed for a file. If more than one rule gives a recipe for the same file, make uses the last one given and prints an error message. (As a special case, if the file’s name begins with a dot, no error message is printed.
What is the rule of prefix and suffix?
A prefix is a word part added to the beginning of a word that changes the word’s meaning. A suffix is a word part added to the end of a word that changes the word’s meaning. Learning the meanings of prefixes and suffixes will help expand your vocabulary, which will help improve your writing.
What is Ldflags in makefile?
The make-specific variables (the ones in capital letters) follow a name convention such that: CC refers to the compiler (gcc in this case); CFLAGS contains compiler directives/options; and LDFLAGS is a list of link (or “load”) directives (here, instructions to link with the C math library).
What is a suffix rule in make?
Suffix rules are the old-fashioned way of defining implicit rules for make. Suffix rules are obsolete because pattern rules are more general and clearer. They are supported in GNU make for compatibility with old makefiles. They come in two kinds: double-suffix and single-suffix . A double-suffix rule is defined by a pair
How to change the list of suffixes in a makefile?
The variable SUFFIXES is defined to the default list of suffixes before make reads any makefiles. You can change the list of suffixes with a rule for the special target .SUFFIXES, but that does not alter this variable.
What is a single suffix rule in Python?
Suffix rule definitions are recognized by comparing each rule’s target against a defined list of known suffixes. When make sees a rule whose target is a known suffix, this rule is considered a single-suffix rule. When make sees a rule whose target is two known suffixes concatenated, this rule is taken as a double-suffix rule.
What is an example of a double suffix rule?
When make sees a rule whose target is two known suffixes concatenated, this rule is taken as a double-suffix rule. For example, ‘ .c ’ and ‘ .o ’ are both on the default list of known suffixes. Therefore, if you define a rule whose target is ‘ .c.o ’, make takes it to be a double-suffix rule with source suffix ‘ .c ’ and target suffix ‘ .o ’.