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Revision 1.106 Revision 1.175
1# Copyright 1999-2005 Gentoo Foundation 1# Copyright 1999-2012 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 1.106 2006/02/19 23:18:30 vapier Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.175 2012/06/05 02:16:40 dirtyepic Exp $
4 4
5# @ECLASS: flag-o-matic.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.
5 12
6# need access to emktemp() 13if [[ ${___ECLASS_ONCE_FLAG_O_MATIC} != "recur -_+^+_- spank" ]] ; then
14___ECLASS_ONCE_FLAG_O_MATIC="recur -_+^+_- spank"
15
7inherit eutils toolchain-funcs multilib 16inherit eutils toolchain-funcs multilib
8 17
9# 18# Return all the flag variables that our high level funcs operate on.
10#### filter-flags <flags> #### 19all-flag-vars() {
11# Remove particular flags from C[XX]FLAGS 20 echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
12# Matches only complete flags 21}
13#
14#### append-flags <flags> ####
15# Add extra flags to your current C[XX]FLAGS
16#
17#### replace-flags <orig.flag> <new.flag> ###
18# Replace a flag by another one
19#
20#### replace-cpu-flags <old.cpus> <new.cpu> ###
21# Replace march/mcpu flags that specify <old.cpus>
22# with flags that specify <new.cpu>
23#
24#### is-flag[q] <flag> ####
25# Returns "true" if flag is set in C[XX]FLAGS
26# Matches only complete a flag
27# q version sets return code but doesn't echo
28#
29#### is-ldflag[q] <flag> ####
30# Returns "true" if flag is set in LDFLAGS
31# Matches only complete a flag
32# q version sets return code but doesn't echo
33#
34#### strip-flags ####
35# Strip C[XX]FLAGS of everything except known
36# good options.
37#
38#### strip-unsupported-flags ####
39# Strip C[XX]FLAGS of any flags not supported by
40# installed version of gcc
41#
42#### get-flag <flag> ####
43# Find and echo the value for a particular flag
44#
45#### replace-sparc64-flags ####
46# Sets mcpu to v8 and uses the original value
47# as mtune if none specified.
48#
49#### filter-mfpmath <math types> ####
50# Remove specified math types from the fpmath specification
51# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
52# will leave the user with -mfpmath=386
53#
54#### append-ldflags ####
55# Add extra flags to your current LDFLAGS
56#
57#### filter-ldflags <flags> ####
58# Remove particular flags from LDFLAGS
59# Matches only complete flags
60#
61#### bindnow-flags ####
62# Returns the flags to enable "now" binding in the current selected linker.
63#
64################ DEPRECATED functions ################
65# The following are still present to avoid breaking existing
66# code more than necessary; however they are deprecated. Please
67# use gcc-specs-* from toolchain-funcs.eclass instead, if you
68# need to know which hardened techs are active in the compiler.
69# See bug #100974
70#
71#### has_hardened ####
72# Returns true if the compiler has 'Hardened' in its version string,
73# (note; switched-spec vanilla compilers satisfy this condition) or
74# the specs file name contains 'hardened'.
75#
76#### has_pie ####
77# Returns true if the compiler by default or with current CFLAGS
78# builds position-independent code.
79#
80#### has_pic ####
81# Returns true if the compiler by default or with current CFLAGS
82# builds position-independent code.
83#
84#### has_ssp_all ####
85# Returns true if the compiler by default or with current CFLAGS
86# generates stack smash protections for all functions
87#
88#### has_ssp ####
89# Returns true if the compiler by default or with current CFLAGS
90# generates stack smash protections for most vulnerable functions
91#
92 22
93# C[XX]FLAGS that we allow in strip-flags 23# {C,CXX,F,FC}FLAGS that we allow in strip-flags
24# Note: shell globs and character lists are allowed
94setup-allowed-flags() { 25setup-allowed-flags() {
95 if [[ -z ${ALLOWED_FLAGS} ]] ; then
96 export ALLOWED_FLAGS="-pipe" 26 ALLOWED_FLAGS="-pipe"
97 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune" 27 ALLOWED_FLAGS+=" -O -O1 -O2 -Os -mcpu -march -mtune"
98 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all" 28 ALLOWED_FLAGS+=" -fstack-protector -fstack-protector-all"
99 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking" 29 ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
100 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time" 30 ALLOWED_FLAGS+=" -fno-PIE -fno-pie -fno-unit-at-a-time"
101 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3" 31 ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
102 fi 32 ALLOWED_FLAGS+=" -fno-ident -fpermissive"
33 ALLOWED_FLAGS+=" -W* -w"
34
103 # allow a bunch of flags that negate features / control ABI 35 # allow a bunch of flags that negate features / control ABI
104 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all" 36 ALLOWED_FLAGS+=" -fno-stack-protector -fno-stack-protector-all \
37 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow \
38 -fno-omit-frame-pointer"
105 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \ 39 ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
106 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \ 40 -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 -mno-sse4.2 \
41 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow -mno-popcnt \
107 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \ 42 -mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
108 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \ 43 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
109 -mieee -mieee-with-inexact \ 44 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
110 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \ 45 -mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
111 -mflat -mno-flat -mno-faster-structs -mfaster-structs \ 46 -mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
112 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \ 47 -mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
113 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias" 48 -mstack-bias -mno-stack-bias -msecure-plt -m*-toc -mfloat-abi=* \
49 -D* -U*"
114 50
115 # C[XX]FLAGS that we are think is ok, but needs testing 51 # 4.5
116 # NOTE: currently -Os have issues with gcc3 and K6* arch's 52 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
117 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks" 53 # 4.6
54 ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
55 # 4.7
56 ALLOWED_FLAGS+=" -mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt"
57
58 export ALLOWED_FLAGS
118 return 0 59 return 0
119} 60}
120 61
121# inverted filters for hardened compiler. This is trying to unpick 62# inverted filters for hardened compiler. This is trying to unpick
122# the hardened compiler defaults. 63# the hardened compiler defaults.
130 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie) 71 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
131 gcc-specs-pie || continue 72 gcc-specs-pie || continue
132 is-flagq -nopie || append-flags -nopie;; 73 is-flagq -nopie || append-flags -nopie;;
133 -fstack-protector) 74 -fstack-protector)
134 gcc-specs-ssp || continue 75 gcc-specs-ssp || continue
135 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;; 76 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
136 -fstack-protector-all) 77 -fstack-protector-all)
137 gcc-specs-ssp-to-all || continue 78 gcc-specs-ssp-to-all || continue
138 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;; 79 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
80 -fno-strict-overflow)
81 gcc-specs-nostrict || continue
82 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
139 esac 83 esac
140 done 84 done
141} 85}
142 86
143# Remove occurrences of strings from variable given in $1 87# Remove occurrences of strings from variable given in $1
144# Strings removed are matched as globs, so for example 88# Strings removed are matched as globs, so for example
145# '-O*' would remove -O1, -O2 etc. 89# '-O*' would remove -O1, -O2 etc.
146_filter-var() { 90_filter-var() {
147 local f x VAR VAL 91 local f x var=$1 new=()
148 declare -a new
149
150 VAR=$1
151 shift 92 shift
152 eval VAL=\${${VAR}} 93
153 for f in ${VAL}; do 94 for f in ${!var} ; do
154 for x in "$@"; do 95 for x in "$@" ; do
155 # Note this should work with globs like -O* 96 # Note this should work with globs like -O*
156 [[ ${f} == ${x} ]] && continue 2 97 [[ ${f} == ${x} ]] && continue 2
157 done 98 done
158 eval new\[\${\#new\[@]}]=\${f} 99 new+=( "${f}" )
159 done 100 done
160 eval export ${VAR}=\${new\[*]} 101 eval export ${var}=\""${new[*]}"\"
161} 102}
162 103
104# @FUNCTION: filter-flags
105# @USAGE: <flags>
106# @DESCRIPTION:
107# Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
163filter-flags() { 108filter-flags() {
164 _filter-hardened "$@" 109 _filter-hardened "$@"
110 local v
111 for v in $(all-flag-vars) ; do
165 _filter-var CFLAGS "$@" 112 _filter-var ${v} "$@"
166 _filter-var CXXFLAGS "$@" 113 done
167 return 0 114 return 0
168} 115}
169 116
117# @FUNCTION: filter-lfs-flags
118# @DESCRIPTION:
119# Remove flags that enable Large File Support.
170filter-lfs-flags() { 120filter-lfs-flags() {
171 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments" 121 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
122 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
123 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
124 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
125 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
172 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 126 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
173} 127}
174 128
129# @FUNCTION: filter-ldflags
130# @USAGE: <flags>
131# @DESCRIPTION:
132# Remove particular <flags> from LDFLAGS. Accepts shell globs.
133filter-ldflags() {
134 _filter-var LDFLAGS "$@"
135 return 0
136}
137
138# @FUNCTION: append-cppflags
139# @USAGE: <flags>
140# @DESCRIPTION:
141# Add extra <flags> to the current CPPFLAGS.
142append-cppflags() {
143 [[ $# -eq 0 ]] && return 0
144 export CPPFLAGS="${CPPFLAGS} $*"
145 return 0
146}
147
148# @FUNCTION: append-cflags
149# @USAGE: <flags>
150# @DESCRIPTION:
151# Add extra <flags> to the current CFLAGS.
152append-cflags() {
153 [[ $# -eq 0 ]] && return 0
154 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
155 return 0
156}
157
158# @FUNCTION: append-cxxflags
159# @USAGE: <flags>
160# @DESCRIPTION:
161# Add extra <flags> to the current CXXFLAGS.
162append-cxxflags() {
163 [[ $# -eq 0 ]] && return 0
164 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
165 return 0
166}
167
168# @FUNCTION: append-fflags
169# @USAGE: <flags>
170# @DESCRIPTION:
171# Add extra <flags> to the current {F,FC}FLAGS.
172append-fflags() {
173 [[ $# -eq 0 ]] && return 0
174 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
175 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
176 return 0
177}
178
179# @FUNCTION: append-lfs-flags
180# @DESCRIPTION:
181# Add flags that enable Large File Support.
175append-lfs-flags() { 182append-lfs-flags() {
176 [[ -n $@ ]] && die "append-lfs-flags takes no arguments" 183 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
184 # see comments in filter-lfs-flags func for meaning of these
177 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 185 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
178} 186}
179 187
188# @FUNCTION: append-ldflags
189# @USAGE: <flags>
190# @DESCRIPTION:
191# Add extra <flags> to the current LDFLAGS.
192append-ldflags() {
193 [[ $# -eq 0 ]] && return 0
194 local flag
195 for flag in "$@"; do
196 [[ ${flag} == -l* ]] && \
197 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
198 done
199
200 export LDFLAGS="${LDFLAGS} $*"
201 return 0
202}
203
204# @FUNCTION: append-flags
205# @USAGE: <flags>
206# @DESCRIPTION:
207# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
180append-flags() { 208append-flags() {
181 [[ -z $* ]] && return 0 209 [[ $# -eq 0 ]] && return 0
182 export CFLAGS="${CFLAGS} $*" 210 case " $* " in
183 export CXXFLAGS="${CXXFLAGS} $*" 211 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
212 *' '-L*|\
213 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
214 esac
215 append-cflags "$@"
216 append-cxxflags "$@"
217 append-fflags "$@"
184 return 0 218 return 0
185} 219}
186 220
221# @FUNCTION: replace-flags
222# @USAGE: <old> <new>
223# @DESCRIPTION:
224# Replace the <old> flag with <new>. Accepts shell globs for <old>.
187replace-flags() { 225replace-flags() {
188 [[ $# != 2 ]] \
189 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \ 226 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
190 && die "replace-flags takes 2 arguments, not $#"
191 227
192 local f fset 228 local f var new
193 declare -a new_CFLAGS new_CXXFLAGS 229 for var in $(all-flag-vars) ; do
194
195 for fset in CFLAGS CXXFLAGS; do
196 # Looping over the flags instead of using a global 230 # Looping over the flags instead of using a global
197 # substitution ensures that we're working with flag atoms. 231 # substitution ensures that we're working with flag atoms.
198 # Otherwise globs like -O* have the potential to wipe out the 232 # Otherwise globs like -O* have the potential to wipe out the
199 # list of flags. 233 # list of flags.
234 new=()
200 for f in ${!fset}; do 235 for f in ${!var} ; do
201 # Note this should work with globs like -O* 236 # Note this should work with globs like -O*
202 [[ ${f} == ${1} ]] && f=${2} 237 [[ ${f} == ${1} ]] && f=${2}
203 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f} 238 new+=( "${f}" )
204 done
205 eval export ${fset}=\${new_${fset}\[*]}
206 done 239 done
240 eval export ${var}=\""${new[*]}"\"
241 done
207 242
208 return 0 243 return 0
209} 244}
210 245
246# @FUNCTION: replace-cpu-flags
247# @USAGE: <old> <new>
248# @DESCRIPTION:
249# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
250# with flags that select the <new> cpu. Accepts shell globs for <old>.
211replace-cpu-flags() { 251replace-cpu-flags() {
212 local newcpu="$#" ; newcpu="${!newcpu}" 252 local newcpu="$#" ; newcpu="${!newcpu}"
213 while [ $# -gt 1 ] ; do 253 while [ $# -gt 1 ] ; do
214 # quote to make sure that no globbing is done (particularly on 254 # quote to make sure that no globbing is done (particularly on
215 # ${oldcpu} prior to calling replace-flags 255 # ${oldcpu}) prior to calling replace-flags
216 replace-flags "-march=${1}" "-march=${newcpu}" 256 replace-flags "-march=${1}" "-march=${newcpu}"
217 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}" 257 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
218 replace-flags "-mtune=${1}" "-mtune=${newcpu}" 258 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
219 shift 259 shift
220 done 260 done
221 return 0 261 return 0
222} 262}
223 263
264_is_flagq() {
265 local x
266 for x in ${!1} ; do
267 [[ ${x} == $2 ]] && return 0
268 done
269 return 1
270}
271
272# @FUNCTION: is-flagq
273# @USAGE: <flag>
274# @DESCRIPTION:
275# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
224is-flagq() { 276is-flagq() {
277 [[ -n $2 ]] && die "Usage: is-flag <flag>"
278
225 local x 279 local var
226 280 for var in $(all-flag-vars) ; do
227 for x in ${CFLAGS} ${CXXFLAGS} ; do 281 _is_flagq ${var} "$1" && return 0
228 # Note this should work with globs like -mcpu=ultrasparc*
229 if [[ ${x} == ${1} ]]; then
230 return 0
231 fi
232 done 282 done
233 return 1 283 return 1
234} 284}
235 285
286# @FUNCTION: is-flag
287# @USAGE: <flag>
288# @DESCRIPTION:
289# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
236is-flag() { 290is-flag() {
237 if is-flagq ${1}; then 291 is-flagq "$@" && echo true
238 echo true
239 return 0
240 fi
241 return 1
242} 292}
243 293
294# @FUNCTION: is-ldflagq
295# @USAGE: <flag>
296# @DESCRIPTION:
297# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
244is-ldflagq() { 298is-ldflagq() {
245 local x 299 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
246 300 _is_flagq LDFLAGS $1
247 for x in ${LDFLAGS} ; do
248 # Note this should work with globs like -mcpu=ultrasparc*
249 if [[ ${x} == ${1} ]]; then
250 return 0
251 fi
252 done
253 return 1
254} 301}
255 302
303# @FUNCTION: is-ldflag
304# @USAGE: <flag>
305# @DESCRIPTION:
306# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
256is-ldflag() { 307is-ldflag() {
257 if is-ldflagq ${1}; then 308 is-ldflagq "$@" && echo true
258 echo true
259 return 0
260 fi
261 return 1
262} 309}
263 310
311# @FUNCTION: filter-mfpmath
312# @USAGE: <math types>
313# @DESCRIPTION:
314# Remove specified math types from the fpmath flag. For example, if the user
315# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
316# -mfpmath=386.
264filter-mfpmath() { 317filter-mfpmath() {
265 local orig_mfpmath new_math prune_math 318 local orig_mfpmath new_math prune_math
266 319
267 # save the original -mfpmath flag 320 # save the original -mfpmath flag
268 orig_mfpmath="`get-flag -mfpmath`" 321 orig_mfpmath=$(get-flag -mfpmath)
269 # get the value of the current -mfpmath flag 322 # get the value of the current -mfpmath flag
270 new_math=" `get-flag mfpmath | tr , ' '` " 323 new_math=$(get-flag mfpmath)
324 new_math=" ${new_math//,/ } "
271 # figure out which math values are to be removed 325 # figure out which math values are to be removed
272 prune_math="" 326 prune_math=""
273 for prune_math in "$@" ; do 327 for prune_math in "$@" ; do
274 new_math="${new_math/ ${prune_math} / }" 328 new_math=${new_math/ ${prune_math} / }
275 done 329 done
276 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" 330 new_math=$(echo ${new_math})
331 new_math=${new_math// /,}
277 332
278 if [ -z "${new_math}" ] ; then 333 if [[ -z ${new_math} ]] ; then
279 # if we're removing all user specified math values are 334 # if we're removing all user specified math values are
280 # slated for removal, then we just filter the flag 335 # slated for removal, then we just filter the flag
281 filter-flags ${orig_mfpmath} 336 filter-flags ${orig_mfpmath}
282 else 337 else
283 # if we only want to filter some of the user specified 338 # if we only want to filter some of the user specified
285 replace-flags ${orig_mfpmath} -mfpmath=${new_math} 340 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
286 fi 341 fi
287 return 0 342 return 0
288} 343}
289 344
345# @FUNCTION: strip-flags
346# @DESCRIPTION:
347# Strip C[XX]FLAGS of everything except known good/safe flags.
290strip-flags() { 348strip-flags() {
291 local x y flag NEW_CFLAGS NEW_CXXFLAGS 349 local x y var
292 350
293 setup-allowed-flags 351 setup-allowed-flags
294 352
295 local NEW_CFLAGS=""
296 local NEW_CXXFLAGS=""
297
298 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
299 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
300 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
301 fi
302
303 set -f # disable pathname expansion 353 set -f # disable pathname expansion
304 354
305 for x in ${CFLAGS}; do 355 for var in $(all-flag-vars) ; do
356 local new=()
357
358 for x in ${!var} ; do
359 local flag=${x%%=*}
306 for y in ${ALLOWED_FLAGS}; do 360 for y in ${ALLOWED_FLAGS} ; do
307 flag=${x%%=*}
308 if [ "${flag%%${y}}" = "" ] ; then 361 if [[ -z ${flag%%${y}} ]] ; then
309 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 362 new+=( "${x}" )
310 break 363 break
311 fi 364 fi
312 done 365 done
313 done 366 done
314 367
315 for x in ${CXXFLAGS}; do
316 for y in ${ALLOWED_FLAGS}; do
317 flag=${x%%=*}
318 if [ "${flag%%${y}}" = "" ] ; then
319 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
320 break
321 fi
322 done
323 done
324
325 # In case we filtered out all optimization flags fallback to -O2 368 # In case we filtered out all optimization flags fallback to -O2
326 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then 369 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
327 NEW_CFLAGS="${NEW_CFLAGS} -O2" 370 new+=( -O2 )
328 fi 371 fi
329 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then 372
330 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2" 373 eval export ${var}=\""${new[*]}"\"
331 fi 374 done
332 375
333 set +f # re-enable pathname expansion 376 set +f # re-enable pathname expansion
334 377
335 export CFLAGS="${NEW_CFLAGS}"
336 export CXXFLAGS="${NEW_CXXFLAGS}"
337 return 0 378 return 0
338} 379}
339 380
340test-flag-PROG() { 381test-flag-PROG() {
341 local comp=$1 382 local comp=$1
342 local flags="$2" 383 local flag=$2
343 384
344 [[ -z ${comp} || -z ${flags} ]] && \ 385 [[ -z ${comp} || -z ${flag} ]] && return 1
345 return 1
346 386
387 # use -c so we can test the assembler as well
347 local PROG=$(tc-get${comp}) 388 local PROG=$(tc-get${comp})
348 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \ 389 ${PROG} "${flag}" -c -o /dev/null -xc /dev/null \
349 > /dev/null 2>&1 390 > /dev/null 2>&1
350} 391}
351 392
352# Returns true if C compiler support given flag 393# @FUNCTION: test-flag-CC
394# @USAGE: <flag>
395# @DESCRIPTION:
396# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
353test-flag-CC() { test-flag-PROG "CC" "$1"; } 397test-flag-CC() { test-flag-PROG "CC" "$1"; }
354 398
355# Returns true if C++ compiler support given flag 399# @FUNCTION: test-flag-CXX
400# @USAGE: <flag>
401# @DESCRIPTION:
402# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
356test-flag-CXX() { test-flag-PROG "CXX" "$1"; } 403test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
404
405# @FUNCTION: test-flag-F77
406# @USAGE: <flag>
407# @DESCRIPTION:
408# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
409test-flag-F77() { test-flag-PROG "F77" "$1"; }
410
411# @FUNCTION: test-flag-FC
412# @USAGE: <flag>
413# @DESCRIPTION:
414# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
415test-flag-FC() { test-flag-PROG "FC" "$1"; }
357 416
358test-flags-PROG() { 417test-flags-PROG() {
359 local comp=$1 418 local comp=$1
360 local flags 419 local flags
361 local x 420 local x
362 421
363 shift 422 shift
364 423
365 [[ -z ${comp} ]] && \ 424 [[ -z ${comp} ]] && return 1
366 return 1
367 425
368 for x in "$@" ; do 426 for x in "$@" ; do
369 test-flag-${comp} "${x}" && flags="${flags} ${x}" 427 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
370 done 428 done
371 429
372 echo "${flags}" 430 echo "${flags}"
373 431
374 # Just bail if we dont have any flags 432 # Just bail if we dont have any flags
375 [[ -n ${flags} ]] 433 [[ -n ${flags} ]]
376} 434}
377 435
378# Returns (echo's) the given flags supported by the C compiler 436# @FUNCTION: test-flags-CC
437# @USAGE: <flags>
438# @DESCRIPTION:
439# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
379test-flags-CC() { test-flags-PROG "CC" "$@"; } 440test-flags-CC() { test-flags-PROG "CC" "$@"; }
380 441
381# Returns (echo's) the given flags supported by the C++ compiler 442# @FUNCTION: test-flags-CXX
443# @USAGE: <flags>
444# @DESCRIPTION:
445# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
382test-flags-CXX() { test-flags-PROG "CXX" "$@"; } 446test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
383 447
448# @FUNCTION: test-flags-F77
449# @USAGE: <flags>
450# @DESCRIPTION:
451# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
452test-flags-F77() { test-flags-PROG "F77" "$@"; }
453
454# @FUNCTION: test-flags-FC
455# @USAGE: <flags>
456# @DESCRIPTION:
457# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
458test-flags-FC() { test-flags-PROG "FC" "$@"; }
459
460# @FUNCTION: test-flags
461# @USAGE: <flags>
462# @DESCRIPTION:
384# Short-hand that should hopefully work for both C and C++ compiler, but 463# Short-hand that should hopefully work for both C and C++ compiler, but
385# its really only present due to the append-flags() abomination. 464# its really only present due to the append-flags() abomination.
386test-flags() { test-flags-CC "$@"; } 465test-flags() { test-flags-CC "$@"; }
387 466
388# Depriciated, use test-flags() 467# @FUNCTION: test_version_info
389test_flag() { 468# @USAGE: <version>
390 ewarn "test_flag: deprecated, please use test-flags()!" >&2 469# @DESCRIPTION:
391 470# Returns shell true if the current C compiler version matches <version>, else returns shell false.
392 test-flags-CC "$@" 471# Accepts shell globs.
393}
394
395test_version_info() { 472test_version_info() {
396 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then 473 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
397 return 0 474 return 0
398 else 475 else
399 return 1 476 return 1
400 fi 477 fi
401} 478}
402 479
480# @FUNCTION: strip-unsupported-flags
481# @DESCRIPTION:
482# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
403strip-unsupported-flags() { 483strip-unsupported-flags() {
404 local x NEW_CFLAGS NEW_CXXFLAGS 484 export CFLAGS=$(test-flags-CC ${CFLAGS})
405 485 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
406 for x in ${CFLAGS} ; do 486 export FFLAGS=$(test-flags-F77 ${FFLAGS})
407 NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})" 487 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
408 done
409 for x in ${CXXFLAGS} ; do
410 NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})"
411 done
412
413 export CFLAGS=${NEW_CFLAGS}
414 export CXXFLAGS=${NEW_CXXFLAGS}
415} 488}
416 489
490# @FUNCTION: get-flag
491# @USAGE: <flag>
492# @DESCRIPTION:
493# Find and echo the value for a particular flag. Accepts shell globs.
417get-flag() { 494get-flag() {
418 local f findflag="$1" 495 local f var findflag="$1"
419 496
420 # this code looks a little flaky but seems to work for 497 # this code looks a little flaky but seems to work for
421 # everything we want ... 498 # everything we want ...
422 # for example, if CFLAGS="-march=i686": 499 # for example, if CFLAGS="-march=i686":
423 # `get-flag -march` == "-march=i686" 500 # `get-flag -march` == "-march=i686"
424 # `get-flag march` == "i686" 501 # `get-flag march` == "i686"
425 for f in ${CFLAGS} ${CXXFLAGS} ; do 502 for var in $(all-flag-vars) ; do
503 for f in ${!var} ; do
426 if [ "${f/${findflag}}" != "${f}" ] ; then 504 if [ "${f/${findflag}}" != "${f}" ] ; then
427 printf "%s\n" "${f/-${findflag}=}" 505 printf "%s\n" "${f/-${findflag}=}"
428 return 0 506 return 0
429 fi 507 fi
508 done
430 done 509 done
431 return 1 510 return 1
432} 511}
433 512
434# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs 513# @FUNCTION: has_m64
435has_hardened() { 514# @DESCRIPTION:
436 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2 515# This doesn't test if the flag is accepted, it tests if the flag actually
437 516# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
438 test_version_info Hardened && return 0 517# return code is 0, else the return code is 1.
439 # The specs file wont exist unless gcc has GCC_SPECS support
440 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
441}
442
443# DEPRECATED - use gcc-specs-pie from toolchain-funcs
444# indicate whether PIC is set
445has_pic() {
446 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
447
448 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
449 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
450 gcc-specs-pie
451}
452
453# DEPRECATED - use gcc-specs-pie from toolchain-funcs
454# indicate whether PIE is set
455has_pie() {
456 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
457
458 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
459 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
460 gcc-specs-pie
461}
462
463# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
464# indicate whether code for SSP is being generated for all functions
465has_ssp_all() {
466 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
467
468 # note; this matches only -fstack-protector-all
469 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
470 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
471 gcc-specs-ssp-all
472}
473
474# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
475# indicate whether code for SSP is being generated
476has_ssp() {
477 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
478
479 # note; this matches both -fstack-protector and -fstack-protector-all
480 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
481 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
482 gcc-specs-ssp
483}
484
485has_m64() { 518has_m64() {
519 eqawarn "${FUNCNAME}: don't use this anymore"
520
486 # this doesnt test if the flag is accepted, it tests if the flag 521 # this doesnt test if the flag is accepted, it tests if the flag
487 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64! 522 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
488 # please dont replace this function with test_flag in some future 523 # please dont replace this function with test_flag in some future
489 # clean-up! 524 # clean-up!
490 525
497 [[ ${ret} != 1 ]] && return 0 532 [[ ${ret} != 1 ]] && return 0
498 return 1 533 return 1
499} 534}
500 535
501has_m32() { 536has_m32() {
502 # this doesnt test if the flag is accepted, it tests if the flag 537 die "${FUNCNAME}: don't use this anymore"
503 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
504 # please dont replace this function with test_flag in some future
505 # clean-up!
506
507 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
508
509 local temp=$(emktemp)
510 echo "int main() { return(0); }" > "${temp}".c
511 MY_CC=$(tc-getCC)
512 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
513 local ret=$?
514 rm -f "${temp}".c
515 [[ ${ret} != 1 ]] && return 0
516 return 1
517} 538}
518 539
540# @FUNCTION: replace-sparc64-flags
541# @DESCRIPTION:
542# Sets mcpu to v8 and uses the original value as mtune if none specified.
519replace-sparc64-flags() { 543replace-sparc64-flags() {
520 local SPARC64_CPUS="ultrasparc3 ultrasparc v9" 544 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
521 545
522 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then 546 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
523 for x in ${SPARC64_CPUS}; do 547 for x in ${SPARC64_CPUS}; do
524 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" 548 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
525 done 549 done
526 else 550 else
527 for x in ${SPARC64_CPUS}; do 551 for x in ${SPARC64_CPUS}; do
528 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 552 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
529 done 553 done
530 fi 554 fi
531 555
532 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then 556 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
533 for x in ${SPARC64_CPUS}; do 557 for x in ${SPARC64_CPUS}; do
534 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" 558 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
535 done 559 done
536 else 560 else
537 for x in ${SPARC64_CPUS}; do 561 for x in ${SPARC64_CPUS}; do
538 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 562 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
539 done 563 done
540 fi 564 fi
541 565
542 export CFLAGS CXXFLAGS 566 export CFLAGS CXXFLAGS
543} 567}
544 568
569# @FUNCTION: append-libs
570# @USAGE: <libs>
571# @DESCRIPTION:
572# Add extra <libs> to the current LIBS.
545append-ldflags() { 573append-libs() {
546 [[ -z $* ]] && return 0 574 [[ $# -eq 0 ]] && return 0
547 export LDFLAGS="${LDFLAGS} $*" 575 local flag
548 return 0 576 for flag in "$@"; do
549} 577 [[ ${flag} == -l* ]] && flag=${flag#-l}
578 export LIBS="${LIBS} -l${flag}"
579 done
550 580
551# Remove flags from LDFLAGS - it's up to the ebuild to filter
552# CFLAGS and CXXFLAGS via filter-flags if they need to.
553filter-ldflags() {
554 _filter-var LDFLAGS "$@"
555 return 0 581 return 0
556} 582}
557 583
584# @FUNCTION: raw-ldflags
585# @USAGE: [flags]
586# @DESCRIPTION:
558# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results 587# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
559# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed 588# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
560# to gcc where it needs the '-Wl,'. 589# to gcc where it needs the '-Wl,'.
590#
591# If no flags are specified, then default to ${LDFLAGS}.
561raw-ldflags() { 592raw-ldflags() {
562 local x input="$@" 593 local x input="$@"
563 [[ -z ${input} ]] && input=${LDFLAGS} 594 [[ -z ${input} ]] && input=${LDFLAGS}
564 set -- 595 set --
565 for x in ${input} ; do 596 for x in ${input} ; do
567 set -- "$@" ${x//,/ } 598 set -- "$@" ${x//,/ }
568 done 599 done
569 echo "$@" 600 echo "$@"
570} 601}
571 602
572# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>, 603# @FUNCTION: no-as-needed
573# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more 604# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
574# fixes. 605no-as-needed() {
575#
576# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
577gcc2-flags() {
578 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
579 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
580 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
581 fi
582
583 replace-cpu-flags k6-{2,3} k6
584 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
585
586 replace-cpu-flags pentium-mmx i586
587 replace-cpu-flags pentium{2,3,4} i686
588
589 replace-cpu-flags ev6{7,8} ev6
590
591 export CFLAGS CXXFLAGS
592}
593
594# Gets the flags needed for "NOW" binding
595bindnow-flags() {
596 case $($(tc-getLD) -v 2>&1 </dev/null) in 606 case $($(tc-getLD) -v 2>&1 </dev/null) in
597 *GNU* | *'with BFD'*) # GNU ld 607 *GNU*) # GNU ld
598 echo "-Wl,-z,now" ;; 608 echo "-Wl,--no-as-needed" ;;
599 *Apple*) # Darwin ld
600 echo "-bind_at_load" ;;
601 *)
602 # Some linkers just recognize -V instead of -v
603 case $($(tc-getLD) -V 2>&1 </dev/null) in
604 *Solaris*) # Solaris accept almost the same GNU options
605 echo "-Wl,-z,now" ;;
606 esac
607 ;;
608 esac 609 esac
609} 610}
611
612fi

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