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1# Copyright 1999-2004 Gentoo Foundation 1# Copyright 1999-2014 Gentoo Foundation
2# Distributed under the terms of the GNU General Public License v2 2# Distributed under the terms of the GNU General Public License v2
3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.73 2004/10/13 14:11:52 vapier Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.205 2015/05/06 07:04:53 vapier Exp $
4#
5# Author Bart Verwilst <verwilst@gentoo.org>
6 4
7ECLASS=flag-o-matic 5# @ECLASS: flag-o-matic.eclass
8INHERITED="$INHERITED $ECLASS" 6# @MAINTAINER:
7# toolchain@gentoo.org
8# @BLURB: common functions to manipulate and query toolchain flags
9# @DESCRIPTION:
10# This eclass contains a suite of functions to help developers sanely
11# and safely manage toolchain flags in their builds.
9 12
10# Please leave ${IUSE} in this until portage .51 is stable, otherwise 13if [[ -z ${_FLAG_O_MATIC_ECLASS} ]]; then
11# IUSE gets clobbered. 14_FLAG_O_MATIC_ECLASS=1
12IUSE="${IUSE} debug"
13 15
14# need access to emktemp() 16inherit eutils toolchain-funcs multilib
15inherit eutils
16 17
17# 18# Return all the flag variables that our high level funcs operate on.
18#### filter-flags <flags> #### 19all-flag-vars() {
19# Remove particular flags from C[XX]FLAGS 20 echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
20# Matches only complete flags 21}
21#
22#### append-flags <flags> ####
23# Add extra flags to your current C[XX]FLAGS
24#
25#### replace-flags <orig.flag> <new.flag> ###
26# Replace a flag by another one
27#
28#### replace-cpu-flags <old.cpus> <new.cpu> ###
29# Replace march/mcpu flags that specify <old.cpus>
30# with flags that specify <new.cpu>
31#
32#### is-flag <flag> ####
33# Returns "true" if flag is set in C[XX]FLAGS
34# Matches only complete a flag
35#
36#### strip-flags ####
37# Strip C[XX]FLAGS of everything except known
38# good options.
39#
40#### strip-unsupported-flags ####
41# Strip C[XX]FLAGS of any flags not supported by
42# installed version of gcc
43#
44#### get-flag <flag> ####
45# Find and echo the value for a particular flag
46#
47#### replace-sparc64-flags ####
48# Sets mcpu to v8 and uses the original value
49# as mtune if none specified.
50#
51#### filter-mfpmath <math types> ####
52# Remove specified math types from the fpmath specification
53# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
54# will leave the user with -mfpmath=386
55#
56#### append-ldflags ####
57# Add extra flags to your current LDFLAGS
58#
59#### filter-ldflags <flags> ####
60# Remove particular flags from LDFLAGS
61# Matches only complete flags
62#
63#### etexec-flags ####
64# hooked function for hardened gcc that appends
65# -fno-pic to {C,CXX,LD}FLAGS
66# when a package is filtering -fpic, -fPIC, -fpie, -fPIE
67#
68#### fstack-flags ####
69# hooked function for hardened gcc that appends
70# -fno-stack-protector to {C,CXX,LD}FLAGS
71# when a package is filtering -fstack-protector, -fstack-protector-all
72# notice: modern automatic specs files will also suppress -fstack-protector-all
73# when only -fno-stack-protector is given
74#
75 22
76# C[XX]FLAGS that we allow in strip-flags 23# {C,CPP,CXX,CCAS,F,FC,LD}FLAGS that we allow in strip-flags
24# Note: shell globs and character lists are allowed
77setup-allowed-flags() { 25setup-allowed-flags() {
78 if [ -z "${ALLOWED_FLAGS}" ] ; then 26 ALLOWED_FLAGS="-pipe"
79 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -fno-stack-protector -fno-pie -fno-unit-at-a-time -pipe -g" 27 ALLOWED_FLAGS+=" -O -O1 -O2 -Os -Og -mcpu -march -mtune"
28 ALLOWED_FLAGS+=" -fstack-protector* -fsanitize=*"
29 ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
30 ALLOWED_FLAGS+=" -fno-PIE -fno-pie -nopie -fno-unit-at-a-time"
31 ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gdwarf-* gstabs -gstabs+"
32 ALLOWED_FLAGS+=" -fno-ident -fpermissive -frecord-gcc-switches"
33 ALLOWED_FLAGS+=" -fdiagnostics*"
34 ALLOWED_FLAGS+=" -W* -w"
35
36 # allow a bunch of flags that negate features / control ABI
37 ALLOWED_FLAGS+=" -fno-stack-protector* -fabi-version=* \
38 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow \
39 -fno-omit-frame-pointer -fno-builtin*"
40 ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
41 -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2 \
42 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt \
43 -mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
44 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
45 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
46 -mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
47 -mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
48 -mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
49 -mstack-bias -mno-stack-bias -msecure-plt -m*-toc -mfloat-abi \
50 -mfix-r10000 -mno-fix-r10000 -D* -U*"
51
52 # 4.5
53 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
54 # 4.6
55 ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
56 # 4.7
57 ALLOWED_FLAGS+=" -mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt"
58 # 4.8
59 ALLOWED_FLAGS+=" -mno-fxsr -mno-rtm -mno-xsave -mno-xsaveopt"
60 # 4.9
61 ALLOWED_FLAGS+=" -mno-avx512cd -mno-avx512er -mno-avx512f -mno-avx512pf -mno-sha"
62
63 # CPPFLAGS and LDFLAGS
64 ALLOWED_FLAGS+=" -I* -L* -R* -Wl,*"
65
66 export ALLOWED_FLAGS
67 return 0
68}
69
70# inverted filters for hardened compiler. This is trying to unpick
71# the hardened compiler defaults.
72_filter-hardened() {
73 local f
74 for f in "$@" ; do
80 case "${ARCH}" in 75 case "${f}" in
81 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -EL -EB -mabi" ;; 76 # Ideally we should only concern ourselves with PIE flags,
82 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC -m64" ;; 77 # not -fPIC or -fpic, but too many places filter -fPIC without
83 x86) ALLOWED_FLAGS="${ALLOWED_FLAGS} -m32" ;; 78 # thinking about -fPIE.
84 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 79 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
85 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 80 gcc-specs-pie || continue
81 is-flagq -nopie || append-flags -nopie;;
82 -fstack-protector)
83 gcc-specs-ssp || continue
84 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
85 -fstack-protector-all)
86 gcc-specs-ssp-to-all || continue
87 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
88 -fno-strict-overflow)
89 gcc-specs-nostrict || continue
90 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
86 esac 91 esac
87 fi 92 done
88 # allow a bunch of flags that negate features / control ABI 93}
89 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all" 94
90 case "${ARCH}" in 95# Remove occurrences of strings from variable given in $1
91 x86|amd64|ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow" ;; 96# Strings removed are matched as globs, so for example
97# '-O*' would remove -O1, -O2 etc.
98_filter-var() {
99 local f x var=$1 new=()
100 shift
101
102 for f in ${!var} ; do
103 for x in "$@" ; do
104 # Note this should work with globs like -O*
105 [[ ${f} == ${x} ]] && continue 2
106 done
107 new+=( "${f}" )
108 done
109 eval export ${var}=\""${new[*]}"\"
110}
111
112# @FUNCTION: filter-flags
113# @USAGE: <flags>
114# @DESCRIPTION:
115# Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
116filter-flags() {
117 _filter-hardened "$@"
118 local v
119 for v in $(all-flag-vars) ; do
120 _filter-var ${v} "$@"
121 done
122 return 0
123}
124
125# @FUNCTION: filter-lfs-flags
126# @DESCRIPTION:
127# Remove flags that enable Large File Support.
128filter-lfs-flags() {
129 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
130 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
131 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
132 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
133 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
134 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
135}
136
137# @FUNCTION: filter-ldflags
138# @USAGE: <flags>
139# @DESCRIPTION:
140# Remove particular <flags> from LDFLAGS. Accepts shell globs.
141filter-ldflags() {
142 _filter-var LDFLAGS "$@"
143 return 0
144}
145
146# @FUNCTION: append-cppflags
147# @USAGE: <flags>
148# @DESCRIPTION:
149# Add extra <flags> to the current CPPFLAGS.
150append-cppflags() {
151 [[ $# -eq 0 ]] && return 0
152 export CPPFLAGS+=" $*"
153 return 0
154}
155
156# @FUNCTION: append-cflags
157# @USAGE: <flags>
158# @DESCRIPTION:
159# Add extra <flags> to the current CFLAGS. If a flag might not be supported
160# with different compilers (or versions), then use test-flags-CC like so:
161# @CODE
162# append-cflags $(test-flags-CC -funky-flag)
163# @CODE
164append-cflags() {
165 [[ $# -eq 0 ]] && return 0
166 # Do not do automatic flag testing ourselves. #417047
167 export CFLAGS+=" $*"
168 return 0
169}
170
171# @FUNCTION: append-cxxflags
172# @USAGE: <flags>
173# @DESCRIPTION:
174# Add extra <flags> to the current CXXFLAGS. If a flag might not be supported
175# with different compilers (or versions), then use test-flags-CXX like so:
176# @CODE
177# append-cxxflags $(test-flags-CXX -funky-flag)
178# @CODE
179append-cxxflags() {
180 [[ $# -eq 0 ]] && return 0
181 # Do not do automatic flag testing ourselves. #417047
182 export CXXFLAGS+=" $*"
183 return 0
184}
185
186# @FUNCTION: append-fflags
187# @USAGE: <flags>
188# @DESCRIPTION:
189# Add extra <flags> to the current {F,FC}FLAGS. If a flag might not be supported
190# with different compilers (or versions), then use test-flags-F77 like so:
191# @CODE
192# append-fflags $(test-flags-F77 -funky-flag)
193# @CODE
194append-fflags() {
195 [[ $# -eq 0 ]] && return 0
196 # Do not do automatic flag testing ourselves. #417047
197 export FFLAGS+=" $*"
198 export FCFLAGS+=" $*"
199 return 0
200}
201
202# @FUNCTION: append-lfs-flags
203# @DESCRIPTION:
204# Add flags that enable Large File Support.
205append-lfs-flags() {
206 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
207 # see comments in filter-lfs-flags func for meaning of these
208 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
209}
210
211# @FUNCTION: append-ldflags
212# @USAGE: <flags>
213# @DESCRIPTION:
214# Add extra <flags> to the current LDFLAGS.
215append-ldflags() {
216 [[ $# -eq 0 ]] && return 0
217 local flag
218 for flag in "$@"; do
219 [[ ${flag} == -l* ]] && \
220 eqawarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
221 done
222
223 export LDFLAGS="${LDFLAGS} $*"
224 return 0
225}
226
227# @FUNCTION: append-flags
228# @USAGE: <flags>
229# @DESCRIPTION:
230# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
231append-flags() {
232 [[ $# -eq 0 ]] && return 0
233 case " $* " in
234 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
235 *' '-L*|\
236 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
92 esac 237 esac
93 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs -msoft-float -mflat -mno-faster-structs -mfaster-structs -mlittle-endian -mbig-endian -mlive-g0 -mcmodel -mno-stack-bias -mstack-bias" 238 append-cflags "$@"
94 239 append-cxxflags "$@"
95 # C[XX]FLAGS that we are think is ok, but needs testing 240 append-fflags "$@"
96 # NOTE: currently -Os have issues with gcc3 and K6* arch's
97 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
98 return 0 241 return 0
99} 242}
100 243
101filter-flags() { 244# @FUNCTION: replace-flags
102 local x f fset 245# @USAGE: <old> <new>
103 declare -a new_CFLAGS new_CXXFLAGS 246# @DESCRIPTION:
247# Replace the <old> flag with <new>. Accepts shell globs for <old>.
248replace-flags() {
249 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
104 250
105 for x in "$@" ; do 251 local f var new
106 case "${x}" in 252 for var in $(all-flag-vars) ; do
107 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;;
108 -fstack-protector|-fstack-protector-all) fstack-flags;;
109 esac
110 done
111
112 for fset in CFLAGS CXXFLAGS; do
113 # Looping over the flags instead of using a global 253 # Looping over the flags instead of using a global
114 # substitution ensures that we're working with flag atoms. 254 # substitution ensures that we're working with flag atoms.
115 # Otherwise globs like -O* have the potential to wipe out the 255 # Otherwise globs like -O* have the potential to wipe out the
116 # list of flags. 256 # list of flags.
257 new=()
117 for f in ${!fset}; do 258 for f in ${!var} ; do
118 for x in "$@"; do
119 # Note this should work with globs like -O*
120 [[ ${f} == ${x} ]] && continue 2
121 done
122 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
123 done
124 eval export ${fset}=\${new_${fset}\[*]}
125 done
126
127 return 0
128}
129
130filter-lfs-flags() {
131 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
132}
133
134append-lfs-flags() {
135 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
136}
137
138append-flags() {
139 export CFLAGS="${CFLAGS} $*"
140 export CXXFLAGS="${CXXFLAGS} $*"
141 [ -n "`is-flag -fno-stack-protector`" -o \
142 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
143 return 0
144}
145
146replace-flags() {
147 local f fset
148 declare -a new_CFLAGS new_CXXFLAGS
149
150 for fset in CFLAGS CXXFLAGS; do
151 # Looping over the flags instead of using a global
152 # substitution ensures that we're working with flag atoms.
153 # Otherwise globs like -O* have the potential to wipe out the
154 # list of flags.
155 for f in ${!fset}; do
156 # Note this should work with globs like -O* 259 # Note this should work with globs like -O*
157 [[ ${f} == ${1} ]] && f=${2} 260 [[ ${f} == ${1} ]] && f=${2}
158 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f} 261 new+=( "${f}" )
159 done
160 eval export ${fset}=\${new_${fset}\[*]}
161 done 262 done
263 eval export ${var}=\""${new[*]}"\"
264 done
162 265
163 return 0 266 return 0
164} 267}
165 268
269# @FUNCTION: replace-cpu-flags
270# @USAGE: <old> <new>
271# @DESCRIPTION:
272# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
273# with flags that select the <new> cpu. Accepts shell globs for <old>.
166replace-cpu-flags() { 274replace-cpu-flags() {
167 local newcpu="$#" ; newcpu="${!newcpu}" 275 local newcpu="$#" ; newcpu="${!newcpu}"
168 while [ $# -gt 1 ] ; do 276 while [ $# -gt 1 ] ; do
169 # quote to make sure that no globbing is done (particularly on 277 # quote to make sure that no globbing is done (particularly on
170 # ${oldcpu} prior to calling replace-flags 278 # ${oldcpu}) prior to calling replace-flags
171 replace-flags "-march=${1}" "-march=${newcpu}" 279 replace-flags "-march=${1}" "-march=${newcpu}"
172 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}" 280 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
173 replace-flags "-mtune=${1}" "-mtune=${newcpu}" 281 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
174 shift 282 shift
175 done 283 done
176 return 0 284 return 0
177} 285}
178 286
287_is_flagq() {
288 local x var
289 eval var=\""\${$1[*]}"\"
290 for x in ${var} ; do
291 [[ ${x} == $2 ]] && return 0
292 done
293 return 1
294}
295
296# @FUNCTION: is-flagq
297# @USAGE: <flag>
298# @DESCRIPTION:
299# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
300is-flagq() {
301 [[ -n $2 ]] && die "Usage: is-flag <flag>"
302
303 local var
304 for var in $(all-flag-vars) ; do
305 _is_flagq ${var} "$1" && return 0
306 done
307 return 1
308}
309
310# @FUNCTION: is-flag
311# @USAGE: <flag>
312# @DESCRIPTION:
313# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
179is-flag() { 314is-flag() {
180 local x 315 is-flagq "$@" && echo true
181
182 for x in ${CFLAGS} ${CXXFLAGS} ; do
183 # Note this should work with globs like -mcpu=ultrasparc*
184 if [[ ${x} == ${1} ]]; then
185 echo true
186 return 0
187 fi
188 done
189 return 1
190} 316}
191 317
318# @FUNCTION: is-ldflagq
319# @USAGE: <flag>
320# @DESCRIPTION:
321# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
322is-ldflagq() {
323 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
324 _is_flagq LDFLAGS $1
325}
326
327# @FUNCTION: is-ldflag
328# @USAGE: <flag>
329# @DESCRIPTION:
330# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
331is-ldflag() {
332 is-ldflagq "$@" && echo true
333}
334
335# @FUNCTION: filter-mfpmath
336# @USAGE: <math types>
337# @DESCRIPTION:
338# Remove specified math types from the fpmath flag. For example, if the user
339# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
340# -mfpmath=386.
192filter-mfpmath() { 341filter-mfpmath() {
193 local orig_mfpmath new_math prune_math 342 local orig_mfpmath new_math prune_math
194 343
195 # save the original -mfpmath flag 344 # save the original -mfpmath flag
196 orig_mfpmath="`get-flag -mfpmath`" 345 orig_mfpmath=$(get-flag -mfpmath)
197 # get the value of the current -mfpmath flag 346 # get the value of the current -mfpmath flag
198 new_math=" `get-flag mfpmath | tr , ' '` " 347 new_math=$(get-flag mfpmath)
348 # convert "both" to something we can filter
349 new_math=${new_math/both/387,sse}
350 new_math=" ${new_math//[,+]/ } "
199 # figure out which math values are to be removed 351 # figure out which math values are to be removed
200 prune_math="" 352 prune_math=""
201 for prune_math in "$@" ; do 353 for prune_math in "$@" ; do
202 new_math="${new_math/ ${prune_math} / }" 354 new_math=${new_math/ ${prune_math} / }
203 done 355 done
204 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" 356 new_math=$(echo ${new_math})
357 new_math=${new_math// /,}
205 358
206 if [ -z "${new_math}" ] ; then 359 if [[ -z ${new_math} ]] ; then
207 # if we're removing all user specified math values are 360 # if we're removing all user specified math values are
208 # slated for removal, then we just filter the flag 361 # slated for removal, then we just filter the flag
209 filter-flags ${orig_mfpmath} 362 filter-flags ${orig_mfpmath}
210 else 363 else
211 # if we only want to filter some of the user specified 364 # if we only want to filter some of the user specified
213 replace-flags ${orig_mfpmath} -mfpmath=${new_math} 366 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
214 fi 367 fi
215 return 0 368 return 0
216} 369}
217 370
371# @FUNCTION: strip-flags
372# @DESCRIPTION:
373# Strip *FLAGS of everything except known good/safe flags. This runs over all
374# flags returned by all_flag_vars().
218strip-flags() { 375strip-flags() {
219 local x y flag NEW_CFLAGS NEW_CXXFLAGS 376 local x y var
220 377
221 setup-allowed-flags 378 setup-allowed-flags
222 379
223 local NEW_CFLAGS="" 380 set -f # disable pathname expansion
224 local NEW_CXXFLAGS=""
225 381
226 # Allow unstable C[XX]FLAGS if we are using unstable profile ... 382 for var in $(all-flag-vars) ; do
227 if has ~${ARCH} ${ACCEPT_KEYWORDS} ; then 383 local new=()
228 use debug && einfo "Enabling the use of some unstable flags" 384
229 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" 385 for x in ${!var} ; do
386 local flag=${x%%=*}
387 for y in ${ALLOWED_FLAGS} ; do
388 if [[ -z ${flag%%${y}} ]] ; then
389 new+=( "${x}" )
390 break
391 fi
392 done
393 done
394
395 # In case we filtered out all optimization flags fallback to -O2
396 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
397 new+=( -O2 )
398 fi
399
400 if [[ ${!var} != "${new[*]}" ]] ; then
401 einfo "strip-flags: ${var}: changed '${!var}' to '${new[*]}'"
402 fi
403 eval export ${var}=\""${new[*]}"\"
404 done
405
406 set +f # re-enable pathname expansion
407
408 return 0
409}
410
411test-flag-PROG() {
412 local comp=$1
413 local lang=$2
414 local flag=$3
415
416 [[ -z ${comp} || -z ${flag} ]] && return 1
417
418 local cmdline=(
419 $(tc-get${comp})
420 # Clang will warn about unknown gcc flags but exit 0.
421 # Need -Werror to force it to exit non-zero.
422 -Werror
423 # Use -c so we can test the assembler as well.
424 -c -o /dev/null
425 )
426 if "${cmdline[@]}" -x${lang} - </dev/null >/dev/null 2>&1 ; then
427 "${cmdline[@]}" "${flag}" -x${lang} - </dev/null >/dev/null 2>&1
428 else
429 "${cmdline[@]}" "${flag}" -c -o /dev/null /dev/null >/dev/null 2>&1
230 fi 430 fi
431}
231 432
232 set -f # disable pathname expansion 433# @FUNCTION: test-flag-CC
434# @USAGE: <flag>
435# @DESCRIPTION:
436# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
437test-flag-CC() { test-flag-PROG "CC" c "$1"; }
233 438
234 for x in ${CFLAGS}; do 439# @FUNCTION: test-flag-CXX
235 for y in ${ALLOWED_FLAGS}; do 440# @USAGE: <flag>
236 flag=${x%%=*} 441# @DESCRIPTION:
237 if [ "${flag%%${y}}" = "" ] ; then 442# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
238 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 443test-flag-CXX() { test-flag-PROG "CXX" c++ "$1"; }
239 break 444
240 fi 445# @FUNCTION: test-flag-F77
446# @USAGE: <flag>
447# @DESCRIPTION:
448# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
449test-flag-F77() { test-flag-PROG "F77" f77 "$1"; }
450
451# @FUNCTION: test-flag-FC
452# @USAGE: <flag>
453# @DESCRIPTION:
454# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
455test-flag-FC() { test-flag-PROG "FC" f95 "$1"; }
456
457test-flags-PROG() {
458 local comp=$1
459 local flags=()
460 local x
461
462 shift
463
464 [[ -z ${comp} ]] && return 1
465
466 for x ; do
467 test-flag-${comp} "${x}" && flags+=( "${x}" )
241 done 468 done
242 done
243 469
244 for x in ${CXXFLAGS}; do 470 echo "${flags[*]}"
245 for y in ${ALLOWED_FLAGS}; do
246 flag=${x%%=*}
247 if [ "${flag%%${y}}" = "" ] ; then
248 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
249 break
250 fi
251 done
252 done
253 471
254 # In case we filtered out all optimization flags fallback to -O2 472 # Just bail if we dont have any flags
255 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then 473 [[ ${#flags[@]} -gt 0 ]]
256 NEW_CFLAGS="${NEW_CFLAGS} -O2"
257 fi
258 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
259 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
260 fi
261
262 set +f # re-enable pathname expansion
263
264 export CFLAGS="${NEW_CFLAGS}"
265 export CXXFLAGS="${NEW_CXXFLAGS}"
266 return 0
267} 474}
268 475
269test_flag() { 476# @FUNCTION: test-flags-CC
270 local cc=${CC:-gcc} ; cc=${cc%% *} 477# @USAGE: <flags>
271 if ${cc} -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then 478# @DESCRIPTION:
272 printf "%s\n" "$*" 479# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
273 return 0 480test-flags-CC() { test-flags-PROG "CC" "$@"; }
274 fi
275 return 1
276}
277 481
482# @FUNCTION: test-flags-CXX
483# @USAGE: <flags>
484# @DESCRIPTION:
485# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
486test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
487
488# @FUNCTION: test-flags-F77
489# @USAGE: <flags>
490# @DESCRIPTION:
491# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
492test-flags-F77() { test-flags-PROG "F77" "$@"; }
493
494# @FUNCTION: test-flags-FC
495# @USAGE: <flags>
496# @DESCRIPTION:
497# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
498test-flags-FC() { test-flags-PROG "FC" "$@"; }
499
500# @FUNCTION: test-flags
501# @USAGE: <flags>
502# @DESCRIPTION:
503# Short-hand that should hopefully work for both C and C++ compiler, but
504# its really only present due to the append-flags() abomination.
505test-flags() { test-flags-CC "$@"; }
506
507# @FUNCTION: test_version_info
508# @USAGE: <version>
509# @DESCRIPTION:
510# Returns shell true if the current C compiler version matches <version>, else returns shell false.
511# Accepts shell globs.
278test_version_info() { 512test_version_info() {
279 local cc=${CC:-gcc} ; cc=${cc%% *}
280 if [[ $(${cc} --version 2>&1) == *$1* ]]; then 513 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
281 return 0 514 return 0
282 else 515 else
283 return 1 516 return 1
284 fi 517 fi
285} 518}
286 519
520# @FUNCTION: strip-unsupported-flags
521# @DESCRIPTION:
522# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
287strip-unsupported-flags() { 523strip-unsupported-flags() {
288 local NEW_CFLAGS NEW_CXXFLAGS 524 export CFLAGS=$(test-flags-CC ${CFLAGS})
289 525 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
290 for x in ${CFLAGS} ; do 526 export FFLAGS=$(test-flags-F77 ${FFLAGS})
291 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`" 527 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
292 done
293 for x in ${CXXFLAGS} ; do
294 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
295 done
296
297 export CFLAGS="${NEW_CFLAGS}"
298 export CXXFLAGS="${NEW_CXXFLAGS}"
299} 528}
300 529
530# @FUNCTION: get-flag
531# @USAGE: <flag>
532# @DESCRIPTION:
533# Find and echo the value for a particular flag. Accepts shell globs.
301get-flag() { 534get-flag() {
302 local f findflag="$1" 535 local f var findflag="$1"
303 536
304 # this code looks a little flaky but seems to work for 537 # this code looks a little flaky but seems to work for
305 # everything we want ... 538 # everything we want ...
306 # for example, if CFLAGS="-march=i686": 539 # for example, if CFLAGS="-march=i686":
307 # `get-flag -march` == "-march=i686" 540 # `get-flag -march` == "-march=i686"
308 # `get-flag march` == "i686" 541 # `get-flag march` == "i686"
309 for f in ${CFLAGS} ${CXXFLAGS} ; do 542 for var in $(all-flag-vars) ; do
543 for f in ${!var} ; do
310 if [ "${f/${findflag}}" != "${f}" ] ; then 544 if [ "${f/${findflag}}" != "${f}" ] ; then
311 printf "%s\n" "${f/-${findflag}=}" 545 printf "%s\n" "${f/-${findflag}=}"
312 return 0 546 return 0
313 fi 547 fi
548 done
314 done 549 done
315 return 1 550 return 1
316} 551}
317 552
318has_hardened() { 553# @FUNCTION: has_m64
319 test_version_info Hardened && return 0 554# @DESCRIPTION:
320 # the specs file wont exist unless gcc has GCC_SPECS support 555# This doesn't test if the flag is accepted, it tests if the flag actually
321 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \ 556# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
322 return 0 557# return code is 0, else the return code is 1.
323 return 1
324}
325
326has_pic() {
327 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
328 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
329 test_version_info pie && return 0
330 return 1
331}
332
333has_pie() {
334 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
335 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
336 test_version_info pie && return 0
337 return 1
338}
339
340has_ssp() {
341 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
342 test_version_info ssp && return 0
343 return 1
344}
345
346has_m64() { 558has_m64() {
559 eqawarn "${FUNCNAME}: don't use this anymore"
560
347 # this doesnt test if the flag is accepted, it tests if the flag 561 # this doesnt test if the flag is accepted, it tests if the flag
348 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64! 562 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
349 # please dont replace this function with test_flag in some future 563 # please dont replace this function with test_flag in some future
350 # clean-up! 564 # clean-up!
565
351 local temp="$(emktemp)" 566 local temp="$(emktemp)"
352 echo "int main() { return(0); }" > ${temp}.c 567 echo "int main() { return(0); }" > "${temp}".c
568 MY_CC=$(tc-getCC)
353 ${CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1 569 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
354 local ret=$? 570 local ret=$?
355 rm -f ${temp}.c 571 rm -f "${temp}".c
356 [ "$ret" != "1" ] && return 0 572 [[ ${ret} != 1 ]] && return 0
357 return 1 573 return 1
358} 574}
359 575
360has_m32() { 576has_m32() {
361 # this doesnt test if the flag is accepted, it tests if the flag 577 die "${FUNCNAME}: don't use this anymore"
362 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
363 # please dont replace this function with test_flag in some future
364 # clean-up!
365 local temp="$(emktemp)"
366 echo "int main() { return(0); }" > ${temp}.c
367 ${CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
368 local ret=$?
369 rm -f ${temp}.c
370 [ "$ret" != "1" ] && return 0
371 return 1
372} 578}
373 579
580# @FUNCTION: replace-sparc64-flags
581# @DESCRIPTION:
582# Sets mcpu to v8 and uses the original value as mtune if none specified.
374replace-sparc64-flags() { 583replace-sparc64-flags() {
375 local SPARC64_CPUS="ultrasparc v9" 584 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
376 585
377 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then 586 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
378 for x in ${SPARC64_CPUS}; do 587 for x in ${SPARC64_CPUS}; do
379 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" 588 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
380 done 589 done
381 else 590 else
382 for x in ${SPARC64_CPUS}; do 591 for x in ${SPARC64_CPUS}; do
383 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 592 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
384 done 593 done
385 fi 594 fi
386 595
387 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then 596 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
388 for x in ${SPARC64_CPUS}; do 597 for x in ${SPARC64_CPUS}; do
389 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" 598 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
390 done 599 done
391 else 600 else
392 for x in ${SPARC64_CPUS}; do 601 for x in ${SPARC64_CPUS}; do
393 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 602 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
394 done 603 done
395 fi 604 fi
396 605
397 export CFLAGS CXXFLAGS 606 export CFLAGS CXXFLAGS
398} 607}
399 608
609# @FUNCTION: append-libs
610# @USAGE: <libs>
611# @DESCRIPTION:
612# Add extra <libs> to the current LIBS. All arguments should be prefixed with
613# either -l or -L. For compatibility, if arguments are not prefixed as
614# options, they are given a -l prefix automatically.
400append-ldflags() { 615append-libs() {
401 export LDFLAGS="${LDFLAGS} $*" 616 [[ $# -eq 0 ]] && return 0
402 return 0 617 local flag
403}
404
405filter-ldflags() {
406 local x
407
408 # we do this fancy spacing stuff so as to not filter
409 # out part of a flag ... we want flag atoms ! :D
410 LDFLAGS=" ${LDFLAGS} "
411 for x in "$@" ; do 618 for flag in "$@"; do
412 LDFLAGS="${LDFLAGS// ${x} / }" 619 if [[ -z "${flag// }" ]]; then
413 done 620 eqawarn "Appending an empty argument to LIBS is invalid! Skipping."
414 LDFLAGS="${LDFLAGS:1:${#LDFLAGS}-2}" 621 continue
415 export LDFLAGS
416 return 0
417}
418
419etexec-flags() {
420 # if you're not using a hardened compiler you wont need this
421 # PIC/no-pic kludge in the first place.
422 has_hardened || return 0
423 # this kludge breaks on amd64, and probably other -fPIC dependant
424 # archs.
425 use amd64 && return 0
426
427 if has_pie || has_pic; then
428 [ -z "`is-flag -fno-pic`" ] &&
429 export CFLAGS="${CFLAGS} `test_flag -fno-pic`"
430 [ -z "`is-flag -nopie`" ] &&
431 export CFLAGS="${CFLAGS} `test_flag -nopie`"
432 fi 622 fi
433 return 0 623 case $flag in
434} 624 -[lL]*)
625 export LIBS="${LIBS} ${flag}"
626 ;;
627 -*)
628 eqawarn "Appending non-library to LIBS (${flag}); Other linker flags should be passed via LDFLAGS"
629 export LIBS="${LIBS} ${flag}"
630 ;;
631 *)
632 export LIBS="${LIBS} -l${flag}"
633 esac
634 done
435 635
436fstack-flags() {
437 if has_ssp; then
438 [ -z "`is-flag -fno-stack-protector`" ] &&
439 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
440 fi
441 return 0 636 return 0
442} 637}
443 638
444# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>, 639# @FUNCTION: raw-ldflags
445# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more 640# @USAGE: [flags]
446# fixes. 641# @DESCRIPTION:
642# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
643# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
644# to gcc where it needs the '-Wl,'.
447# 645#
448# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3 646# If no flags are specified, then default to ${LDFLAGS}.
449gcc2-flags() { 647raw-ldflags() {
450 CFLAGS=${CFLAGS//pentium-mmx/i586} 648 local x input="$@"
451 CFLAGS=${CFLAGS//pentium[234]/i686} 649 [[ -z ${input} ]] && input=${LDFLAGS}
452 CFLAGS=${CFLAGS//k6-[23]/k6} 650 set --
453 CFLAGS=${CFLAGS//athlon-tbird/i686} 651 for x in ${input} ; do
454 CFLAGS=${CFLAGS//athlon-4/i686} 652 case ${x} in
455 CFLAGS=${CFLAGS//athlon-[xm]p/i686} 653 -Wl,*)
456 CFLAGS=${CFLAGS//athlon/i686} 654 x=${x#-Wl,}
655 set -- "$@" ${x//,/ }
656 ;;
657 *) # Assume it's a compiler driver flag, so throw it away #441808
658 ;;
659 esac
660 done
661 echo "$@"
662}
457 663
458 CXXFLAGS=${CXXFLAGS//pentium-mmx/i586} 664# @FUNCTION: no-as-needed
459 CXXFLAGS=${CXXFLAGS//pentium[234]/i686} 665# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
460 CXXFLAGS=${CXXFLAGS//k6-[23]/k6} 666no-as-needed() {
461 CXXFLAGS=${CXXFLAGS//athlon-tbird/i686} 667 case $($(tc-getLD) -v 2>&1 </dev/null) in
462 CXXFLAGS=${CXXFLAGS//athlon-4/i686} 668 *GNU*) # GNU ld
463 CXXFLAGS=${CXXFLAGS//athlon-[xm]p/i686} 669 echo "-Wl,--no-as-needed" ;;
464 CXXFLAGS=${CXXFLAGS//athlon/i686} 670 esac
671}
465 672
466 if [ "$ARCH" = alpha ]; then
467 CHOST=${CHOST/#alphaev6[78]/alphaev6}
468 CFLAGS=${CFLAGS//ev6[78]/ev6}
469 CXXFLAGS=${CXXFLAGS//ev6[78]/ev6}
470 fi 673fi
471
472 export CFLAGS CXXFLAGS
473}

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