This page about How to build applications on Linux. ISO C and its standard library are described in C Tips. POSIX/Linux specific features and enhancements are described in Linux Programming.

Use indent to constistently format your C-code. Here a configuration example for indent to be put in $HOME/.indent.pro:

/* Default Config: Use Kernighan & Ritchie coding style: */
--k-and-r-style
 
/* My minor variants to Kernighan & Ritchie Style: */
--line-length 80  /* Because default is 75 */
--no-tabs         /* Use spaces instead of tabs */
-brf              /* Place function opening brace after function declaration */

Usage:

find -name '*.c' -print0 | xargs -0 indent

Manual (Current Development)

• -c : Do not link
• -o file : Place output in file file. Applies to object files and executables
• -Wall : enable most warnings

See also: Journey of a C Program to Linux Executable in 4 Stages

Manual

• A line beginning with # is a comment
• The variable $* contains
• The variable $@ or $(@) contains the name of the target (tested)
• '@' at the beginning of a command runs the command but does not copy the line to stdout
• '-' at the beginning of a command runs the command but does not abort make if command fails
• Implicit rules example: file.o is made automatically from file.c with a command of the form `$(CC) -c $(CPPFLAGS) $(CFLAGS)'
• make -n or make --dry-run - Don't actually run any commands; just print them.

a = Peter
c =  $(a)
d := $(a)
a = Franz
 
test:
        @echo c expands to $(c) # Franz
        @echo d expands to $(d) # Peter

1. Every environment variable that make sees when it starts up is transformed into a make variable with the same name and value.
2. An explicit assignment in the makefile overrides the environment
3. An assignment in the makefile can be overridden by the command line argument, eg make CFLAGS='-g -O' [target]

Sources: 1 2

useres expect https://www.gnu.org/software/make/manual/html_node/Command-Variables.html#Command-Variables

$@ does oviously not work in prerequsites, only in recipie!

http://people.freedesktop.org/~dbn/pkg-config-guide.html

Manual

[Makefile.am] → (automake) ⇒ [Makefile.in]

Manual

                               [Makefile.in]
                                     ⇓
[configure.ac] → (autoconf) ⇒ [(configure)] ⇒ [Makefile] -> make ⇒ ...