Main predefined variables of GNU make

Main predefined variables of GNU make
Predefined Variables
Description
$ *
The name of the target file that does not contain the extension.
$ +
All dependent files are separated by spaces and appear sequentially. They may contain duplicate dependent files.
$ <
The name of the first dependent file.
$?
All dependent files are separated by spaces. The modified date of these dependent files is later than the object creation date.
$ @
The complete name of the target.
$ ^
All dependent files are separated by spaces and do not contain duplicate dependent files.
$ %
If the target is an archive member, this variable indicates the name of the archive member of the target. For example, if the target name is
Mytarget. So (image. O), then $ @ is mytarget. So, and $ % is image. O.
Ar
Archive maintenance ProgramThe default value is ar.
Arflags
Archive maintenance program options.
As
The name of the assembler. The default value is.
Asflags
Assembler options.
CC
The name of the C compiler. The default value is CC.
Cflags
C compiler options.
CPP
The name of the C pre-compiler. The default value is $ (CC)-E.
Cppflags
C precompiled options.
Cxx
The name of the C ++ compiler. The default value is g ++.
Cxxflags
C ++ compiler options.
FC
Name of the Fortran compiler. The default value is f77.
Fflags
FORTRAN compiler options.