Makefile

   1 ########################################################################
   2 # Copyright (C) 2021, 2022  Alejandro Colomar <alx@kernel.org>
   3 # SPDX-License-Identifier:  GPL-2.0  OR  LGPL-2.0
   4 ########################################################################
   5 # Conventions:
   6 #
   7 # - Follow "Makefile Conventions" from the "GNU Coding Standards" closely.
   8 #   However, when something could be improved, don't follow those.
   9 # - Uppercase variables, when referring files, refer to files in this repo.
  10 # - Lowercase variables, when referring files, refer to system files.
  11 # - Lowercase variables starting with '_' refer to absolute paths,
  12 #   including $(DESTDIR).
  13 # - Uppercase variables starting with '_' refer to temporary files produced
  14 #   in $builddir.
  15 # - Variables ending with '_' refer to a subdir of their parent dir, which
  16 #   is in a variable of the same name but without the '_'.  The subdir is
  17 #   named after this project: <*/man>.
  18 # - Variables ending in '_rm' refer to files that can be removed (exist).
  19 # - Variables ending in '_rmdir' refer to dirs that can be removed (exist).
  20 # - Targets of the form '%-rm' remove their corresponding file '%'.
  21 # - Targets of the form '%/.-rmdir' remove their corresponding dir '%/'.
  22 # - Targets of the form '%/.' create their corresponding directory '%/'.
  23 # - Every file or directory to be created depends on its parent directory.
  24 #   This avoids race conditions caused by `mkdir -p`.  Only the root
  25 #   directories are created with parents.
  26 # - The 'FORCE' target is used to make phony some variables that can't be
  27 #   .PHONY to avoid some optimizations.
  28 #
  29 ########################################################################
  30
  31 SHELL := /usr/bin/env bash -Eeuo pipefail
  32
  33
  34 MAKEFLAGS += --no-builtin-rules
  35 MAKEFLAGS += --no-builtin-variables
  36 MAKEFLAGS += --no-print-directory
  37 MAKEFLAGS += --warn-undefined-variables
  38
  39
  40 srcdir := .
  41
  42
  43 .PHONY: all
  44 all: build
  45         @:
  46
  47 .PHONY: help
  48 help:
  49         $(info  Targets:)
  50         $(info  )
  51         $(info  all                     Alias for "build")
  52         $(info  )
  53         $(info  clean                   Remove $$(builddir))
  54         $(info  )
  55         $(info  build                   Alias for "build-html")
  56         $(info  )
  57         $(info  build-html              Build HTML manual pages)
  58         $(info  html                    Alias for "build-html")
  59         $(info  )
  60         $(info  build-src               Alias for "build-src-ld")
  61         $(info  build-src-c             Extract C programs from EXAMPLES)
  62         $(info  build-src-cc            Compile C programs from EXAMPLES)
  63         $(info  build-src-ld            Link C programs from EXAMPLES)
  64         $(info  )
  65         $(info  lint                    Wrapper for "lint-c lint-man")
  66         $(info  lint-c                  Wrapper for lint-c-* targets)
  67         $(info  lint-c-checkpatch       Lint C programs from EXAMPLES with checkpatch(1))
  68         $(info  lint-c-clang-tidy       Lint C programs from EXAMPLES with clang-tidy(1))
  69         $(info  lint-c-cpplint          Lint C programs from EXAMPLES with cpplint(1))
  70         $(info  lint-c-iwyu             Lint C programs from EXAMPLES with iwyu(1))
  71         $(info  lint-man                Wrapper for lint-man-* targets)
  72         $(info  lint-man-groff          Lint man pages with groff(1))
  73         $(info  lint-man-mandoc         Lint man pages with mandoc(1))
  74         $(info  lint-man-tbl            Lint man pages about '\" t' comment for tbl(1))
  75         $(info  )
  76         $(info  [un]install             Alias for "[un]install-man")
  77         $(info  [un]install-man         Wrapper for [un]install-man* targets)
  78         $(info  [un]install-man1        [Un]install man pages in section 1)
  79         $(info  [un]install-man2        [Un]install man pages in section 2)
  80         $(info  [un]install-man2type    [Un]install man pages in section 2type)
  81         $(info  [un]install-man3        [Un]install man pages in section 3)
  82         $(info  [un]install-man3const   [Un]install man pages in section 3const)
  83         $(info  [un]install-man3head    [Un]install man pages in section 3head)
  84         $(info  [un]install-man3type    [Un]install man pages in section 3type)
  85         $(info  [un]install-man4        [Un]install man pages in section 4)
  86         $(info  [un]install-man5        [Un]install man pages in section 5)
  87         $(info  [un]install-man6        [Un]install man pages in section 6)
  88         $(info  [un]install-man7        [Un]install man pages in section 7)
  89         $(info  [un]install-man8        [Un]install man pages in section 8)
  90         $(info  )
  91         $(info  [un]install-html        [Un]install HTML manual pages)
  92         $(info  )
  93         $(info  dist                    Wrapper for dist-* targets)
  94         $(info  dist-tar                Create a tarball of the repository)
  95         $(info  dist-gz                 Create a compressed tarball (.tar.gz))
  96         $(info  dist-xz                 Create a compressed tarball (.tar.xz))
  97         $(info  )
  98         $(info  help                    Print this help)
  99         $(info  )
 100         $(info  Variables:)
 101         $(info  )
 102         $(info  V                       Define to non-empty string for verbose output)
 103
 104
 105 .SECONDEXPANSION:
 106
 107
 108 include $(srcdir)/lib/build.mk
 109 include $(srcdir)/lib/build-html.mk
 110 include $(srcdir)/lib/build-src.mk
 111 include $(srcdir)/lib/dist.mk
 112 include $(srcdir)/lib/install.mk
 113 include $(srcdir)/lib/install-html.mk
 114 include $(srcdir)/lib/install-man.mk
 115 include $(srcdir)/lib/lint.mk
 116 include $(srcdir)/lib/lint-c.mk
 117 include $(srcdir)/lib/lint-man.mk
 118 include $(srcdir)/lib/verbose.mk
 119
 120
 121 FORCE: