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1 | # Copyright (c) 2010 Vladimir Prus. |
2 | # Copyright (c) 2013 Steven Watanabe | |
3 | # | |
4 | # Use, modification and distribution is subject to the Boost Software | |
1e59de90 TL |
5 | # License Version 1.0. (See accompanying file LICENSE.txt or |
6 | # https://www.bfgroup.xyz/b2/LICENSE.txt) | |
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7 | |
8 | # Supports the libpng library | |
9 | # | |
10 | # After 'using libpng', the following targets are available: | |
11 | # | |
12 | # /libpng//libpng -- The libpng library | |
13 | ||
14 | import project ; | |
15 | import ac ; | |
16 | import errors ; | |
11fdf7f2 | 17 | import feature ; |
7c673cae | 18 | import "class" : new ; |
f67539c2 | 19 | import targets ; |
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20 | import path ; |
21 | import modules ; | |
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22 | import indirect ; |
23 | import property ; | |
24 | import property-set ; | |
25 | ||
26 | header = png.h ; | |
f67539c2 TL |
27 | |
28 | # On Windows, binary distributions of libpng and package managers | |
29 | # name the library differently (e.g. vcpkg installs libpng16.lib). | |
30 | # Listing popular names increases chances of successful look-up. | |
31 | names = libpng libpng16 png png16 ; | |
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32 | |
33 | sources = png.c pngerror.c pngget.c pngmem.c pngpread.c pngread.c pngrio.c pngrtran.c pngrutil.c | |
34 | pngset.c pngtrans.c pngwio.c pngwrite.c pngwtran.c pngwutil.c ; | |
35 | ||
36 | library-id = 0 ; | |
37 | ||
38 | if --debug-configuration in [ modules.peek : ARGV ] | |
39 | { | |
40 | .debug = true ; | |
41 | } | |
42 | ||
43 | # Initializes the libpng library. | |
44 | # | |
45 | # libpng can be configured either to use pre-existing binaries | |
46 | # or to build the library from source. | |
47 | # | |
48 | # Options for configuring a prebuilt libpng:: | |
49 | # | |
50 | # <search> | |
51 | # The directory containing the libpng binaries. | |
52 | # <name> | |
53 | # Overrides the default library name. | |
54 | # <include> | |
55 | # The directory containing the libpng headers. | |
56 | # | |
57 | # If none of these options is specified, then the environmental | |
58 | # variables LIBPNG_LIBRARY_PATH, LIBPNG_NAME, and LIBPNG_INCLUDE will | |
59 | # be used instead. | |
60 | # | |
61 | # Options for building libpng from source:: | |
62 | # | |
63 | # <source> | |
64 | # The libpng source directory. Defaults to the environmental variable | |
65 | # LIBPNG_SOURCE. | |
66 | # <tag> | |
67 | # A rule which computes the actual name of the compiled | |
68 | # libraries based on the build properties. Ignored | |
69 | # when using precompiled binaries. | |
70 | # <build-name> | |
71 | # The base name to use for the compiled library. Ignored | |
72 | # when using precompiled binaries. | |
73 | # | |
74 | # Examples:: | |
75 | # | |
76 | # # Find libpng in the default system location | |
77 | # using libpng ; | |
78 | # # Build libpng from source | |
79 | # using libpng : 1.5.4 : <source>/home/steven/libpng-1.5.4 ; | |
80 | # # Find libpng in /usr/local | |
81 | # using libpng : 1.5.4 | |
82 | # : <include>/usr/local/include <search>/usr/local/lib ; | |
83 | # # Build libpng from source for msvc and find | |
84 | # # prebuilt binaries for gcc. | |
85 | # using libpng : 1.5.4 : <source>C:/Devel/src/libpng-1.5.4 : <toolset>msvc ; | |
86 | # using libpng : 1.5.4 : : <toolset>gcc ; | |
87 | # | |
88 | rule init ( | |
89 | version ? | |
90 | # The libpng version (currently ignored) | |
91 | ||
92 | : options * | |
93 | # A list of the options to use | |
94 | ||
95 | : requirements * | |
96 | # The requirements for the libpng target | |
97 | ||
98 | : is-default ? | |
99 | # Default configurations are only used when libpng | |
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100 | # has not yet been configured. This option is |
101 | # deprecated. A configuration will be treated | |
102 | # as a default when none of <include>, <search>, | |
103 | # <name>, and <source> are present. | |
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104 | ) |
105 | { | |
106 | local caller = [ project.current ] ; | |
107 | ||
108 | if ! $(.initialized) | |
109 | { | |
110 | .initialized = true ; | |
111 | ||
112 | project.initialize $(__name__) ; | |
113 | .project = [ project.current ] ; | |
114 | project libpng ; | |
115 | } | |
116 | ||
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117 | local library-path = [ feature.get-values <search> : $(options) ] ; |
118 | local include-path = [ feature.get-values <include> : $(options) ] ; | |
119 | local source-path = [ feature.get-values <source> : $(options) ] ; | |
120 | local library-name = [ feature.get-values <name> : $(options) ] ; | |
121 | local tag = [ feature.get-values <tag> : $(options) ] ; | |
122 | local build-name = [ feature.get-values <build-name> : $(options) ] ; | |
123 | ||
124 | if ! $(library-path) && ! $(include-path) && ! $(source-path) && ! $(library-name) | |
125 | { | |
126 | is-default = true ; | |
127 | } | |
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128 | |
129 | condition = [ property-set.create $(requirements) ] ; | |
130 | condition = [ property-set.create [ $(condition).base ] ] ; | |
131 | ||
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132 | # Ignore environmental LIBPNG_SOURCE if this initialization |
133 | # requested to search for a specific pre-built library. | |
134 | if $(library-path) || $(include-path) || $(library-name) | |
135 | { | |
136 | if $(source-path) || $(tag) || $(build-name) | |
137 | { | |
138 | errors.user-error "incompatible options for libpng:" | |
139 | [ property.select <search> <include> <name> : $(options) ] "and" | |
140 | [ property.select <source> <tag> <build-name> : $(options) ] ; | |
141 | } | |
7c673cae | 142 | } |
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143 | else |
144 | { | |
145 | source-path ?= [ modules.peek : LIBPNG_SOURCE ] ; | |
146 | } | |
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147 | |
148 | if $(.configured.$(condition)) | |
149 | { | |
150 | if $(is-default) | |
151 | { | |
152 | if $(.debug) | |
153 | { | |
154 | ECHO "notice: [libpng] libpng is already configured" ; | |
155 | } | |
156 | } | |
157 | else | |
158 | { | |
159 | errors.user-error "libpng is already configured" ; | |
160 | } | |
161 | return ; | |
162 | } | |
11fdf7f2 | 163 | else if $(source-path) |
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164 | { |
165 | build-name ?= png ; | |
166 | library-id = [ CALC $(library-id) + 1 ] ; | |
167 | tag = [ MATCH ^@?(.*)$ : $(tag) ] ; | |
11fdf7f2 | 168 | if $(tag) |
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169 | { |
170 | tag = [ indirect.make $(tag) : [ $(caller).project-module ] ] ; | |
171 | } | |
172 | sources = [ path.glob $(source-path) : $(sources) ] ; | |
173 | if $(.debug) | |
174 | { | |
175 | ECHO "notice: [libpng] Building libpng from source as $(build-name)" ; | |
176 | if $(condition) | |
177 | { | |
178 | ECHO "notice: [libpng] Condition" [ $(condition).raw ] ; | |
179 | } | |
180 | if $(sources) | |
181 | { | |
182 | ECHO "notice: [libpng] found libpng source in $(source-path)" ; | |
183 | } | |
184 | else | |
185 | { | |
186 | ECHO "warning: [libpng] could not find libpng source in $(source-path)" ; | |
187 | } | |
188 | } | |
189 | local target ; | |
190 | if $(sources) { | |
191 | target = [ targets.create-typed-target LIB : $(.project) | |
192 | : $(build-name).$(library-id) | |
193 | : $(sources) | |
194 | : $(requirements) | |
195 | <tag>@$(tag) | |
196 | <include>$(source-path) | |
197 | <toolset>msvc:<define>_CRT_SECURE_NO_DEPRECATE | |
198 | <toolset>msvc:<define>_SCL_SECURE_NO_DEPRECATE | |
199 | <link>shared:<define>LIBPNG_DLL | |
200 | : | |
201 | : <include>$(source-path) ] ; | |
202 | } | |
203 | ||
204 | local mt = [ new ac-library libpng : $(.project) : $(condition) ] ; | |
205 | $(mt).set-header $(header) ; | |
206 | $(mt).set-default-names $(names) ; | |
207 | if $(target) | |
208 | { | |
209 | $(mt).set-target $(target) ; | |
210 | } | |
211 | targets.main-target-alternative $(mt) ; | |
212 | } else { | |
213 | if $(.debug) | |
214 | { | |
215 | ECHO "notice: [libpng] Using pre-installed library" ; | |
216 | if $(condition) | |
217 | { | |
218 | ECHO "notice: [libpng] Condition" [ $(condition).raw ] ; | |
219 | } | |
220 | } | |
221 | ||
222 | local mt = [ new ac-library libpng : $(.project) : $(condition) : | |
223 | $(include-path) : $(library-path) : $(library-name) : $(root) ] ; | |
224 | $(mt).set-header $(header) ; | |
225 | $(mt).set-default-names $(names) ; | |
226 | targets.main-target-alternative $(mt) ; | |
227 | } | |
228 | .configured.$(condition) = true ; | |
229 | } |