1 # Copyright 1999-2015 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
5 # @ECLASS: scons-utils.eclass
8 # @BLURB: helper functions to deal with SCons buildsystem
10 # This eclass provides a set of function to help developers sanely call
11 # dev-util/scons and pass parameters to it.
13 # Please note that SCons is more like a 'build system creation kit',
14 # and requires a lot of upstream customization to be used sanely.
15 # You will often need to request fixes upstream and/or patch the build
16 # system. In particular:
18 # 1. There are no 'standard' variables. To respect CC, CXX, CFLAGS,
19 # CXXFLAGS, CPPFLAGS, LDFLAGS, upstream needs to define appropriate
20 # variables explicitly. In some cases, upstreams respect envvars,
21 # in others you need to pass them as options.
23 # 2. SCons scrubs out environment by default and replaces it with some
24 # pre-defined values. To respect environment variables such as PATH,
25 # Upstreams need to explicitly get them from os.environ and copy them
26 # to the build environment.
30 # inherit scons-utils toolchain-funcs
37 # ENABLE_NLS=$(usex nls)
42 # escons "${MYSCONS[@]}"
46 # # note: this can be DESTDIR, INSTALL_ROOT, ... depending on package
47 # escons "${MYSCONS[@]}" DESTDIR="${D}" install
51 # -- public variables --
53 # @ECLASS-VARIABLE: SCONS_MIN_VERSION
56 # The minimal version of SCons required for the build to work.
58 # @VARIABLE: myesconsargs
61 # DEPRECATED, EAPI 0..5 ONLY: pass options to escons instead
63 # List of package-specific options to pass to all SCons calls. Supposed to be
64 # set in src_configure().
66 # @ECLASS-VARIABLE: SCONSOPTS
69 # The default set of options to pass to scons. Similar to MAKEOPTS,
70 # supposed to be set in make.conf. If unset, escons() will use cleaned
71 # up MAKEOPTS instead.
73 # @ECLASS-VARIABLE: EXTRA_ESCONS
76 # The additional parameters to pass to SCons whenever escons() is used.
77 # Much like EXTRA_EMAKE, this is not supposed to be used in make.conf
80 # @ECLASS-VARIABLE: USE_SCONS_TRUE
82 # DEPRECATED: use usex instead
84 # The default value for truth in scons-use() (1 by default).
85 : ${USE_SCONS_TRUE:=1}
87 # @ECLASS-VARIABLE: USE_SCONS_FALSE
89 # DEPRECATED: use usex instead
91 # The default value for false in scons-use() (0 by default).
92 : ${USE_SCONS_FALSE:=0}
94 # -- EAPI support check --
98 *) die "EAPI ${EAPI} unsupported."
101 # -- ebuild variables setup --
103 if [[ -n ${SCONS_MIN_VERSION} ]]; then
104 DEPEND=">=dev-util/scons-${SCONS_MIN_VERSION}"
106 DEPEND="dev-util/scons"
109 # -- public functions --
112 # @USAGE: [<args>...]
114 # Call scons, passing the supplied arguments. Like emake, this function
115 # does die on failure in EAPI 4. Respects nonfatal in EAPI 6 and newer.
119 debug-print-function ${FUNCNAME} "${@}"
121 # Use myesconsargs in EAPI 5 and older
122 if [[ ${EAPI} == [012345] ]]; then
123 set -- "${myesconsargs[@]}" "${@}"
126 # if SCONSOPTS are _unset_, use cleaned MAKEOPTS
127 if [[ ! ${SCONSOPTS+set} ]]; then
129 _scons_clean_makeopts
132 set -- scons ${SCONSOPTS} ${EXTRA_ESCONS} "${@}"
137 if [[ ${ret} -ne 0 ]]; then
139 0|1|2|3) # nonfatal in EAPIs 0 through 3
141 4|5) # 100% fatal in 4 & 5
144 *) # respect nonfatal in 6 onwards
145 die -n "escons failed."
152 # @FUNCTION: _scons_get_default_jobs
155 # Output the default number of jobs, used if -j is used without
156 # argument. Tries to figure out the number of logical CPUs, falling
157 # back to hardcoded constant.
158 _scons_get_default_jobs() {
161 if type -P nproc &>/dev/null; then
164 elif type -P python &>/dev/null; then
165 # fallback to python2.6+
166 # note: this may fail (raise NotImplementedError)
167 nproc=$(python -c 'import multiprocessing; print(multiprocessing.cpu_count());' 2>/dev/null)
170 if [[ ${nproc} ]]; then
171 echo $(( nproc + 1 ))
178 # @FUNCTION: _scons_clean_makeopts
180 # @USAGE: [makeflags] [...]
182 # Strip the supplied makeflags (or ${MAKEOPTS} if called without
183 # an argument) of options not supported by SCons and make sure --jobs
184 # gets an argument. Output the resulting flag list (suitable
185 # for an assignment to SCONSOPTS).
186 _scons_clean_makeopts() {
187 local new_makeopts=()
189 debug-print-function ${FUNCNAME} "${@}"
191 if [[ ${#} -eq 0 ]]; then
192 debug-print "Using MAKEOPTS: [${MAKEOPTS}]"
195 # unquote if necessary
199 # empty MAKEOPTS give out empty SCONSOPTS
200 # thus, we do need to worry about the initial setup
201 if [[ ${*} = ${_SCONS_CACHE_MAKEOPTS} ]]; then
202 SCONSOPTS=${_SCONS_CACHE_SCONSOPTS}
203 debug-print "Cache hit: [${SCONSOPTS}]"
206 _SCONS_CACHE_MAKEOPTS=${*}
208 while [[ ${#} -gt 0 ]]; do
210 # clean, simple to check -- we like that
211 --jobs=*|--keep-going)
212 new_makeopts+=( ${1} )
214 # need to take a look at the next arg and guess
216 if [[ ${#} -gt 1 && ${2} =~ ^[0-9]+$ ]]; then
217 new_makeopts+=( ${1} ${2} )
220 # no value means no limit, let's pass a random int
221 new_makeopts+=( ${1}=$(_scons_get_default_jobs) )
224 # strip other long options
233 while [[ -n ${str} ]]; do
238 # -j needs to come last
240 if [[ ${#} -gt 1 && ${2} =~ ^[0-9]+$ ]]; then
244 new_optstr+="j $(_scons_get_default_jobs)"
247 # otherwise, everything after -j is treated as an arg
256 if [[ -n ${new_optstr} ]]; then
257 new_makeopts+=( -${new_optstr} )
264 SCONSOPTS=${new_makeopts[*]}
265 _SCONS_CACHE_SCONSOPTS=${SCONSOPTS}
266 debug-print "New SCONSOPTS: [${SCONSOPTS}]"
269 # @FUNCTION: use_scons
270 # @USAGE: <use-flag> [var-name] [var-opt-true] [var-opt-false]
272 # DEPRECATED, EAPI 0..5 ONLY: use usex instead
274 # Output a SCons parameter with value depending on the USE flag state.
275 # If the USE flag is set, output <var-name>=<var-opt-true>; otherwise
276 # <var-name>=<var-opt-false>.
278 # If <var-name> is omitted, <use-flag> will be used instead. However,
279 # if <use-flag> starts with an exclamation mark (!flag), 'no' will be
280 # prepended to the name (e.g. noflag).
282 # If <var-opt-true> and/or <var-opt-false> are omitted,
283 # ${USE_SCONS_TRUE} and/or ${USE_SCONS_FALSE} will be used instead.
285 [[ ${EAPI} == [012345] ]] \
286 || die "${FUNCNAME} is banned in EAPI ${EAPI}, use usex instead"
289 local varname=${2:-${flag/\!/no}}
290 local vartrue=${3:-${USE_SCONS_TRUE}}
291 local varfalse=${4:-${USE_SCONS_FALSE}}
293 debug-print-function ${FUNCNAME} "${@}"
295 if [[ ${#} -eq 0 ]]; then
296 eerror "Usage: scons-use <use-flag> [var-name] [var-opt-true] [var-opt-false]"
297 die 'scons-use(): not enough arguments'
300 if use "${flag}"; then
301 echo "${varname}=${vartrue}"
303 echo "${varname}=${varfalse}"