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Macros in makefiles may be overridden in the command-line arguments passed to the Make utility. Environment variables are also available as macros. For example, the macro CC is frequently used in makefiles to refer to the location of a C compiler. If used consistently throughout the makefile, then the compiler used can be changed by changing ...
(For this reason source code using Autotools is normally distributed without the files that configure generates.) If the body of source code is changed more fundamentally, then configure.ac and the .in files need to be changed and all subsequent steps also followed. To process files, autoconf uses the GNU implementation of the m4 macro system.
The generated "Makefile.in"s are portable and compliant with the Makefile conventions in the GNU Coding Standards, and may be used by configure scripts to generate a working Makefile. [2] The Free Software Foundation maintains automake as one of the GNU programs, and as part of the GNU build system.
The following list of C++ template libraries details the various libraries of templates available for the C++ programming language.. The choice of a typical library depends on a diverse range of requirements such as: desired features (e.g.: large dimensional linear algebra, parallel computation, partial differential equations), commercial/opensource nature, readability of API, portability or ...
m4 is a general-purpose macro processor included in most Unix-like operating systems, and is a component of the POSIX standard.. The language was designed by Brian Kernighan and Dennis Ritchie for the original versions of UNIX.
qmake is a software build automation tool that generates makefiles for building a codebase. As it generates configuration files for other build tools, it is classified as a meta-build tool. The makefiles that qmake produces are tailored to the particular platform where it is run from based on qmake project files.
If they are not specified in the Makefile, then they will be read from the environment, if present. Tools like autoconf's ./configure script will usually pick them up from the environment and write them into the generated Makefiles. Some package install scripts, like SDL, allow CFLAGS settings to override their normal settings (instead of ...
For example, if a program uses both an int and a double version of the max() function template above, the compiler will create an object code version of max() that operates on int arguments and another object code version that operates on double arguments.