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1# Copyright 1999-2006 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 1.108 2006/06/15 14:45:59 vapier Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.176 2012/06/18 06:45:28 grobian Exp $
4#
5# Maintainer: base-system@gentoo.org
6 4
7# need access to emktemp() 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.
12
13if [[ ${___ECLASS_ONCE_FLAG_O_MATIC} != "recur -_+^+_- spank" ]] ; then
14___ECLASS_ONCE_FLAG_O_MATIC="recur -_+^+_- spank"
15
8inherit eutils toolchain-funcs multilib 16inherit eutils toolchain-funcs multilib
9 17
10# 18# Return all the flag variables that our high level funcs operate on.
11#### filter-flags <flags> #### 19all-flag-vars() {
12# Remove particular flags from C[XX]FLAGS 20 echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
13# Matches only complete flags 21}
14#
15#### append-flags <flags> ####
16# Add extra flags to your current C[XX]FLAGS
17#
18#### replace-flags <orig.flag> <new.flag> ###
19# Replace a flag by another one
20#
21#### replace-cpu-flags <old.cpus> <new.cpu> ###
22# Replace march/mcpu flags that specify <old.cpus>
23# with flags that specify <new.cpu>
24#
25#### is-flag[q] <flag> ####
26# Returns "true" if flag is set in C[XX]FLAGS
27# Matches only complete a flag
28# q version sets return code but doesn't echo
29#
30#### is-ldflag[q] <flag> ####
31# Returns "true" if flag is set in LDFLAGS
32# Matches only complete a flag
33# q version sets return code but doesn't echo
34#
35#### strip-flags ####
36# Strip C[XX]FLAGS of everything except known
37# good options.
38#
39#### strip-unsupported-flags ####
40# Strip C[XX]FLAGS of any flags not supported by
41# installed version of gcc
42#
43#### get-flag <flag> ####
44# Find and echo the value for a particular flag
45#
46#### replace-sparc64-flags ####
47# Sets mcpu to v8 and uses the original value
48# as mtune if none specified.
49#
50#### filter-mfpmath <math types> ####
51# Remove specified math types from the fpmath specification
52# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
53# will leave the user with -mfpmath=386
54#
55#### append-ldflags ####
56# Add extra flags to your current LDFLAGS
57#
58#### filter-ldflags <flags> ####
59# Remove particular flags from LDFLAGS
60# Matches only complete flags
61#
62#### bindnow-flags ####
63# Returns the flags to enable "now" binding in the current selected linker.
64#
65################ DEPRECATED functions ################
66# The following are still present to avoid breaking existing
67# code more than necessary; however they are deprecated. Please
68# use gcc-specs-* from toolchain-funcs.eclass instead, if you
69# need to know which hardened techs are active in the compiler.
70# See bug #100974
71#
72#### has_hardened ####
73# Returns true if the compiler has 'Hardened' in its version string,
74# (note; switched-spec vanilla compilers satisfy this condition) or
75# the specs file name contains 'hardened'.
76#
77#### has_pie ####
78# Returns true if the compiler by default or with current CFLAGS
79# builds position-independent code.
80#
81#### has_pic ####
82# Returns true if the compiler by default or with current CFLAGS
83# builds position-independent code.
84#
85#### has_ssp_all ####
86# Returns true if the compiler by default or with current CFLAGS
87# generates stack smash protections for all functions
88#
89#### has_ssp ####
90# Returns true if the compiler by default or with current CFLAGS
91# generates stack smash protections for most vulnerable functions
92#
93 22
94# 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
95setup-allowed-flags() { 25setup-allowed-flags() {
96 if [[ -z ${ALLOWED_FLAGS} ]] ; then
97 export ALLOWED_FLAGS="-pipe" 26 ALLOWED_FLAGS="-pipe"
98 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune" 27 ALLOWED_FLAGS+=" -O -O1 -O2 -Os -mcpu -march -mtune"
99 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all" 28 ALLOWED_FLAGS+=" -fstack-protector -fstack-protector-all"
100 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking" 29 ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
101 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time" 30 ALLOWED_FLAGS+=" -fno-PIE -fno-pie -fno-unit-at-a-time"
102 export ALLOWED_FLAGS="${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+"
103 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident" 32 ALLOWED_FLAGS+=" -fno-ident -fpermissive"
104 fi 33 ALLOWED_FLAGS+=" -W* -w"
34
105 # allow a bunch of flags that negate features / control ABI 35 # allow a bunch of flags that negate features / control ABI
106 ALLOWED_FLAGS="${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"
107 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \ 39 ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
108 -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 \
109 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \ 42 -mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
110 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \ 43 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
111 -mieee -mieee-with-inexact \ 44 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
112 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \ 45 -mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
113 -mflat -mno-flat -mno-faster-structs -mfaster-structs \ 46 -mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
114 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \ 47 -mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
115 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias" 48 -mstack-bias -mno-stack-bias -msecure-plt -m*-toc -mfloat-abi=* \
49 -D* -U*"
116 50
117 # C[XX]FLAGS that we are think is ok, but needs testing 51 # 4.5
118 # NOTE: currently -Os have issues with gcc3 and K6* arch's 52 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
119 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 # CPPFLAGS and LDFLAGS
59 ALLOWED_FLAGS+=" -I* -L* -R* -Wl,*"
60
61 export ALLOWED_FLAGS
120 return 0 62 return 0
121} 63}
122 64
123# inverted filters for hardened compiler. This is trying to unpick 65# inverted filters for hardened compiler. This is trying to unpick
124# the hardened compiler defaults. 66# the hardened compiler defaults.
132 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie) 74 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
133 gcc-specs-pie || continue 75 gcc-specs-pie || continue
134 is-flagq -nopie || append-flags -nopie;; 76 is-flagq -nopie || append-flags -nopie;;
135 -fstack-protector) 77 -fstack-protector)
136 gcc-specs-ssp || continue 78 gcc-specs-ssp || continue
137 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;; 79 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
138 -fstack-protector-all) 80 -fstack-protector-all)
139 gcc-specs-ssp-to-all || continue 81 gcc-specs-ssp-to-all || continue
140 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;; 82 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
83 -fno-strict-overflow)
84 gcc-specs-nostrict || continue
85 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
141 esac 86 esac
142 done 87 done
143} 88}
144 89
145# Remove occurrences of strings from variable given in $1 90# Remove occurrences of strings from variable given in $1
146# Strings removed are matched as globs, so for example 91# Strings removed are matched as globs, so for example
147# '-O*' would remove -O1, -O2 etc. 92# '-O*' would remove -O1, -O2 etc.
148_filter-var() { 93_filter-var() {
149 local f x VAR VAL 94 local f x var=$1 new=()
150 declare -a new
151
152 VAR=$1
153 shift 95 shift
154 eval VAL=\${${VAR}} 96
155 for f in ${VAL}; do 97 for f in ${!var} ; do
156 for x in "$@"; do 98 for x in "$@" ; do
157 # Note this should work with globs like -O* 99 # Note this should work with globs like -O*
158 [[ ${f} == ${x} ]] && continue 2 100 [[ ${f} == ${x} ]] && continue 2
159 done 101 done
160 eval new\[\${\#new\[@]}]=\${f} 102 new+=( "${f}" )
161 done 103 done
162 eval export ${VAR}=\${new\[*]} 104 eval export ${var}=\""${new[*]}"\"
163} 105}
164 106
107# @FUNCTION: filter-flags
108# @USAGE: <flags>
109# @DESCRIPTION:
110# Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
165filter-flags() { 111filter-flags() {
166 _filter-hardened "$@" 112 _filter-hardened "$@"
113 local v
114 for v in $(all-flag-vars) ; do
167 _filter-var CFLAGS "$@" 115 _filter-var ${v} "$@"
168 _filter-var CXXFLAGS "$@" 116 done
169 return 0 117 return 0
170} 118}
171 119
120# @FUNCTION: filter-lfs-flags
121# @DESCRIPTION:
122# Remove flags that enable Large File Support.
172filter-lfs-flags() { 123filter-lfs-flags() {
173 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments" 124 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
125 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
126 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
127 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
128 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
174 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 129 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
175} 130}
176 131
132# @FUNCTION: filter-ldflags
133# @USAGE: <flags>
134# @DESCRIPTION:
135# Remove particular <flags> from LDFLAGS. Accepts shell globs.
136filter-ldflags() {
137 _filter-var LDFLAGS "$@"
138 return 0
139}
140
141# @FUNCTION: append-cppflags
142# @USAGE: <flags>
143# @DESCRIPTION:
144# Add extra <flags> to the current CPPFLAGS.
145append-cppflags() {
146 [[ $# -eq 0 ]] && return 0
147 export CPPFLAGS="${CPPFLAGS} $*"
148 return 0
149}
150
151# @FUNCTION: append-cflags
152# @USAGE: <flags>
153# @DESCRIPTION:
154# Add extra <flags> to the current CFLAGS.
155append-cflags() {
156 [[ $# -eq 0 ]] && return 0
157 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
158 return 0
159}
160
161# @FUNCTION: append-cxxflags
162# @USAGE: <flags>
163# @DESCRIPTION:
164# Add extra <flags> to the current CXXFLAGS.
165append-cxxflags() {
166 [[ $# -eq 0 ]] && return 0
167 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
168 return 0
169}
170
171# @FUNCTION: append-fflags
172# @USAGE: <flags>
173# @DESCRIPTION:
174# Add extra <flags> to the current {F,FC}FLAGS.
175append-fflags() {
176 [[ $# -eq 0 ]] && return 0
177 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
178 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
179 return 0
180}
181
182# @FUNCTION: append-lfs-flags
183# @DESCRIPTION:
184# Add flags that enable Large File Support.
177append-lfs-flags() { 185append-lfs-flags() {
178 [[ -n $@ ]] && die "append-lfs-flags takes no arguments" 186 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
187 # see comments in filter-lfs-flags func for meaning of these
179 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 188 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
180} 189}
181 190
191# @FUNCTION: append-ldflags
192# @USAGE: <flags>
193# @DESCRIPTION:
194# Add extra <flags> to the current LDFLAGS.
195append-ldflags() {
196 [[ $# -eq 0 ]] && return 0
197 local flag
198 for flag in "$@"; do
199 [[ ${flag} == -l* ]] && \
200 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
201 done
202
203 export LDFLAGS="${LDFLAGS} $*"
204 return 0
205}
206
207# @FUNCTION: append-flags
208# @USAGE: <flags>
209# @DESCRIPTION:
210# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
182append-flags() { 211append-flags() {
183 [[ -z $* ]] && return 0 212 [[ $# -eq 0 ]] && return 0
184 export CFLAGS="${CFLAGS} $*" 213 case " $* " in
185 export CXXFLAGS="${CXXFLAGS} $*" 214 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
215 *' '-L*|\
216 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
217 esac
218 append-cflags "$@"
219 append-cxxflags "$@"
220 append-fflags "$@"
186 return 0 221 return 0
187} 222}
188 223
224# @FUNCTION: replace-flags
225# @USAGE: <old> <new>
226# @DESCRIPTION:
227# Replace the <old> flag with <new>. Accepts shell globs for <old>.
189replace-flags() { 228replace-flags() {
190 [[ $# != 2 ]] \
191 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \ 229 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
192 && die "replace-flags takes 2 arguments, not $#"
193 230
194 local f fset 231 local f var new
195 declare -a new_CFLAGS new_CXXFLAGS 232 for var in $(all-flag-vars) ; do
196
197 for fset in CFLAGS CXXFLAGS; do
198 # Looping over the flags instead of using a global 233 # Looping over the flags instead of using a global
199 # substitution ensures that we're working with flag atoms. 234 # substitution ensures that we're working with flag atoms.
200 # Otherwise globs like -O* have the potential to wipe out the 235 # Otherwise globs like -O* have the potential to wipe out the
201 # list of flags. 236 # list of flags.
237 new=()
202 for f in ${!fset}; do 238 for f in ${!var} ; do
203 # Note this should work with globs like -O* 239 # Note this should work with globs like -O*
204 [[ ${f} == ${1} ]] && f=${2} 240 [[ ${f} == ${1} ]] && f=${2}
205 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f} 241 new+=( "${f}" )
206 done
207 eval export ${fset}=\${new_${fset}\[*]}
208 done 242 done
243 eval export ${var}=\""${new[*]}"\"
244 done
209 245
210 return 0 246 return 0
211} 247}
212 248
249# @FUNCTION: replace-cpu-flags
250# @USAGE: <old> <new>
251# @DESCRIPTION:
252# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
253# with flags that select the <new> cpu. Accepts shell globs for <old>.
213replace-cpu-flags() { 254replace-cpu-flags() {
214 local newcpu="$#" ; newcpu="${!newcpu}" 255 local newcpu="$#" ; newcpu="${!newcpu}"
215 while [ $# -gt 1 ] ; do 256 while [ $# -gt 1 ] ; do
216 # quote to make sure that no globbing is done (particularly on 257 # quote to make sure that no globbing is done (particularly on
217 # ${oldcpu} prior to calling replace-flags 258 # ${oldcpu}) prior to calling replace-flags
218 replace-flags "-march=${1}" "-march=${newcpu}" 259 replace-flags "-march=${1}" "-march=${newcpu}"
219 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}" 260 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
220 replace-flags "-mtune=${1}" "-mtune=${newcpu}" 261 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
221 shift 262 shift
222 done 263 done
223 return 0 264 return 0
224} 265}
225 266
267_is_flagq() {
268 local x
269 for x in ${!1} ; do
270 [[ ${x} == $2 ]] && return 0
271 done
272 return 1
273}
274
275# @FUNCTION: is-flagq
276# @USAGE: <flag>
277# @DESCRIPTION:
278# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
226is-flagq() { 279is-flagq() {
280 [[ -n $2 ]] && die "Usage: is-flag <flag>"
281
227 local x 282 local var
228 283 for var in $(all-flag-vars) ; do
229 for x in ${CFLAGS} ${CXXFLAGS} ; do 284 _is_flagq ${var} "$1" && return 0
230 # Note this should work with globs like -mcpu=ultrasparc*
231 if [[ ${x} == ${1} ]]; then
232 return 0
233 fi
234 done 285 done
235 return 1 286 return 1
236} 287}
237 288
289# @FUNCTION: is-flag
290# @USAGE: <flag>
291# @DESCRIPTION:
292# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
238is-flag() { 293is-flag() {
239 if is-flagq ${1}; then 294 is-flagq "$@" && echo true
240 echo true
241 return 0
242 fi
243 return 1
244} 295}
245 296
297# @FUNCTION: is-ldflagq
298# @USAGE: <flag>
299# @DESCRIPTION:
300# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
246is-ldflagq() { 301is-ldflagq() {
247 local x 302 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
248 303 _is_flagq LDFLAGS $1
249 for x in ${LDFLAGS} ; do
250 # Note this should work with globs like -mcpu=ultrasparc*
251 if [[ ${x} == ${1} ]]; then
252 return 0
253 fi
254 done
255 return 1
256} 304}
257 305
306# @FUNCTION: is-ldflag
307# @USAGE: <flag>
308# @DESCRIPTION:
309# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
258is-ldflag() { 310is-ldflag() {
259 if is-ldflagq ${1}; then 311 is-ldflagq "$@" && echo true
260 echo true
261 return 0
262 fi
263 return 1
264} 312}
265 313
314# @FUNCTION: filter-mfpmath
315# @USAGE: <math types>
316# @DESCRIPTION:
317# Remove specified math types from the fpmath flag. For example, if the user
318# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
319# -mfpmath=386.
266filter-mfpmath() { 320filter-mfpmath() {
267 local orig_mfpmath new_math prune_math 321 local orig_mfpmath new_math prune_math
268 322
269 # save the original -mfpmath flag 323 # save the original -mfpmath flag
270 orig_mfpmath="`get-flag -mfpmath`" 324 orig_mfpmath=$(get-flag -mfpmath)
271 # get the value of the current -mfpmath flag 325 # get the value of the current -mfpmath flag
272 new_math=" `get-flag mfpmath | tr , ' '` " 326 new_math=$(get-flag mfpmath)
327 new_math=" ${new_math//,/ } "
273 # figure out which math values are to be removed 328 # figure out which math values are to be removed
274 prune_math="" 329 prune_math=""
275 for prune_math in "$@" ; do 330 for prune_math in "$@" ; do
276 new_math="${new_math/ ${prune_math} / }" 331 new_math=${new_math/ ${prune_math} / }
277 done 332 done
278 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" 333 new_math=$(echo ${new_math})
334 new_math=${new_math// /,}
279 335
280 if [ -z "${new_math}" ] ; then 336 if [[ -z ${new_math} ]] ; then
281 # if we're removing all user specified math values are 337 # if we're removing all user specified math values are
282 # slated for removal, then we just filter the flag 338 # slated for removal, then we just filter the flag
283 filter-flags ${orig_mfpmath} 339 filter-flags ${orig_mfpmath}
284 else 340 else
285 # if we only want to filter some of the user specified 341 # if we only want to filter some of the user specified
287 replace-flags ${orig_mfpmath} -mfpmath=${new_math} 343 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
288 fi 344 fi
289 return 0 345 return 0
290} 346}
291 347
348# @FUNCTION: strip-flags
349# @DESCRIPTION:
350# Strip *FLAGS of everything except known good/safe flags. This runs over all
351# flags returned by all_flag_vars().
292strip-flags() { 352strip-flags() {
293 local x y flag NEW_CFLAGS NEW_CXXFLAGS 353 local x y var
294 354
295 setup-allowed-flags 355 setup-allowed-flags
296 356
297 local NEW_CFLAGS=""
298 local NEW_CXXFLAGS=""
299
300 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
301 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
302 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
303 fi
304
305 set -f # disable pathname expansion 357 set -f # disable pathname expansion
306 358
307 for x in ${CFLAGS}; do 359 for var in $(all-flag-vars) ; do
360 local new=()
361
362 for x in ${!var} ; do
363 local flag=${x%%=*}
308 for y in ${ALLOWED_FLAGS}; do 364 for y in ${ALLOWED_FLAGS} ; do
309 flag=${x%%=*}
310 if [ "${flag%%${y}}" = "" ] ; then 365 if [[ -z ${flag%%${y}} ]] ; then
311 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 366 new+=( "${x}" )
312 break 367 break
313 fi 368 fi
314 done 369 done
315 done 370 done
316 371
317 for x in ${CXXFLAGS}; do
318 for y in ${ALLOWED_FLAGS}; do
319 flag=${x%%=*}
320 if [ "${flag%%${y}}" = "" ] ; then
321 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
322 break
323 fi
324 done
325 done
326
327 # In case we filtered out all optimization flags fallback to -O2 372 # In case we filtered out all optimization flags fallback to -O2
328 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then 373 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
329 NEW_CFLAGS="${NEW_CFLAGS} -O2" 374 new+=( -O2 )
330 fi 375 fi
331 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then 376
332 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2" 377 eval export ${var}=\""${new[*]}"\"
333 fi 378 done
334 379
335 set +f # re-enable pathname expansion 380 set +f # re-enable pathname expansion
336 381
337 export CFLAGS="${NEW_CFLAGS}"
338 export CXXFLAGS="${NEW_CXXFLAGS}"
339 return 0 382 return 0
340} 383}
341 384
342test-flag-PROG() { 385test-flag-PROG() {
343 local comp=$1 386 local comp=$1
344 local flags="$2" 387 local flag=$2
345 388
346 [[ -z ${comp} || -z ${flags} ]] && \ 389 [[ -z ${comp} || -z ${flag} ]] && return 1
347 return 1
348 390
391 # use -c so we can test the assembler as well
349 local PROG=$(tc-get${comp}) 392 local PROG=$(tc-get${comp})
350 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \ 393 ${PROG} "${flag}" -c -o /dev/null -xc /dev/null \
351 > /dev/null 2>&1 394 > /dev/null 2>&1
352} 395}
353 396
354# Returns true if C compiler support given flag 397# @FUNCTION: test-flag-CC
398# @USAGE: <flag>
399# @DESCRIPTION:
400# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
355test-flag-CC() { test-flag-PROG "CC" "$1"; } 401test-flag-CC() { test-flag-PROG "CC" "$1"; }
356 402
357# Returns true if C++ compiler support given flag 403# @FUNCTION: test-flag-CXX
404# @USAGE: <flag>
405# @DESCRIPTION:
406# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
358test-flag-CXX() { test-flag-PROG "CXX" "$1"; } 407test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
408
409# @FUNCTION: test-flag-F77
410# @USAGE: <flag>
411# @DESCRIPTION:
412# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
413test-flag-F77() { test-flag-PROG "F77" "$1"; }
414
415# @FUNCTION: test-flag-FC
416# @USAGE: <flag>
417# @DESCRIPTION:
418# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
419test-flag-FC() { test-flag-PROG "FC" "$1"; }
359 420
360test-flags-PROG() { 421test-flags-PROG() {
361 local comp=$1 422 local comp=$1
362 local flags 423 local flags
363 local x 424 local x
364 425
365 shift 426 shift
366 427
367 [[ -z ${comp} ]] && \ 428 [[ -z ${comp} ]] && return 1
368 return 1
369 429
370 for x in "$@" ; do 430 for x in "$@" ; do
371 test-flag-${comp} "${x}" && flags="${flags} ${x}" 431 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
372 done 432 done
373 433
374 echo "${flags}" 434 echo "${flags}"
375 435
376 # Just bail if we dont have any flags 436 # Just bail if we dont have any flags
377 [[ -n ${flags} ]] 437 [[ -n ${flags} ]]
378} 438}
379 439
380# Returns (echo's) the given flags supported by the C compiler 440# @FUNCTION: test-flags-CC
441# @USAGE: <flags>
442# @DESCRIPTION:
443# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
381test-flags-CC() { test-flags-PROG "CC" "$@"; } 444test-flags-CC() { test-flags-PROG "CC" "$@"; }
382 445
383# Returns (echo's) the given flags supported by the C++ compiler 446# @FUNCTION: test-flags-CXX
447# @USAGE: <flags>
448# @DESCRIPTION:
449# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
384test-flags-CXX() { test-flags-PROG "CXX" "$@"; } 450test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
385 451
452# @FUNCTION: test-flags-F77
453# @USAGE: <flags>
454# @DESCRIPTION:
455# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
456test-flags-F77() { test-flags-PROG "F77" "$@"; }
457
458# @FUNCTION: test-flags-FC
459# @USAGE: <flags>
460# @DESCRIPTION:
461# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
462test-flags-FC() { test-flags-PROG "FC" "$@"; }
463
464# @FUNCTION: test-flags
465# @USAGE: <flags>
466# @DESCRIPTION:
386# Short-hand that should hopefully work for both C and C++ compiler, but 467# Short-hand that should hopefully work for both C and C++ compiler, but
387# its really only present due to the append-flags() abomination. 468# its really only present due to the append-flags() abomination.
388test-flags() { test-flags-CC "$@"; } 469test-flags() { test-flags-CC "$@"; }
389 470
390# Depriciated, use test-flags() 471# @FUNCTION: test_version_info
391test_flag() { 472# @USAGE: <version>
392 ewarn "test_flag: deprecated, please use test-flags()!" >&2 473# @DESCRIPTION:
393 474# Returns shell true if the current C compiler version matches <version>, else returns shell false.
394 test-flags-CC "$@" 475# Accepts shell globs.
395}
396
397test_version_info() { 476test_version_info() {
398 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then 477 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
399 return 0 478 return 0
400 else 479 else
401 return 1 480 return 1
402 fi 481 fi
403} 482}
404 483
484# @FUNCTION: strip-unsupported-flags
485# @DESCRIPTION:
486# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
405strip-unsupported-flags() { 487strip-unsupported-flags() {
406 local x NEW_CFLAGS NEW_CXXFLAGS 488 export CFLAGS=$(test-flags-CC ${CFLAGS})
407 489 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
408 for x in ${CFLAGS} ; do 490 export FFLAGS=$(test-flags-F77 ${FFLAGS})
409 NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})" 491 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
410 done
411 for x in ${CXXFLAGS} ; do
412 NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})"
413 done
414
415 export CFLAGS=${NEW_CFLAGS}
416 export CXXFLAGS=${NEW_CXXFLAGS}
417} 492}
418 493
494# @FUNCTION: get-flag
495# @USAGE: <flag>
496# @DESCRIPTION:
497# Find and echo the value for a particular flag. Accepts shell globs.
419get-flag() { 498get-flag() {
420 local f findflag="$1" 499 local f var findflag="$1"
421 500
422 # this code looks a little flaky but seems to work for 501 # this code looks a little flaky but seems to work for
423 # everything we want ... 502 # everything we want ...
424 # for example, if CFLAGS="-march=i686": 503 # for example, if CFLAGS="-march=i686":
425 # `get-flag -march` == "-march=i686" 504 # `get-flag -march` == "-march=i686"
426 # `get-flag march` == "i686" 505 # `get-flag march` == "i686"
427 for f in ${CFLAGS} ${CXXFLAGS} ; do 506 for var in $(all-flag-vars) ; do
507 for f in ${!var} ; do
428 if [ "${f/${findflag}}" != "${f}" ] ; then 508 if [ "${f/${findflag}}" != "${f}" ] ; then
429 printf "%s\n" "${f/-${findflag}=}" 509 printf "%s\n" "${f/-${findflag}=}"
430 return 0 510 return 0
431 fi 511 fi
512 done
432 done 513 done
433 return 1 514 return 1
434} 515}
435 516
436# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs 517# @FUNCTION: has_m64
437has_hardened() { 518# @DESCRIPTION:
438 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2 519# This doesn't test if the flag is accepted, it tests if the flag actually
439 520# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
440 test_version_info Hardened && return 0 521# return code is 0, else the return code is 1.
441 # The specs file wont exist unless gcc has GCC_SPECS support
442 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
443}
444
445# DEPRECATED - use gcc-specs-pie from toolchain-funcs
446# indicate whether PIC is set
447has_pic() {
448 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
449
450 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
451 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
452 gcc-specs-pie
453}
454
455# DEPRECATED - use gcc-specs-pie from toolchain-funcs
456# indicate whether PIE is set
457has_pie() {
458 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
459
460 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
461 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
462 gcc-specs-pie
463}
464
465# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
466# indicate whether code for SSP is being generated for all functions
467has_ssp_all() {
468 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
469
470 # note; this matches only -fstack-protector-all
471 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
472 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
473 gcc-specs-ssp-all
474}
475
476# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
477# indicate whether code for SSP is being generated
478has_ssp() {
479 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
480
481 # note; this matches both -fstack-protector and -fstack-protector-all
482 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
483 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
484 gcc-specs-ssp
485}
486
487has_m64() { 522has_m64() {
523 eqawarn "${FUNCNAME}: don't use this anymore"
524
488 # this doesnt test if the flag is accepted, it tests if the flag 525 # this doesnt test if the flag is accepted, it tests if the flag
489 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64! 526 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
490 # please dont replace this function with test_flag in some future 527 # please dont replace this function with test_flag in some future
491 # clean-up! 528 # clean-up!
492 529
499 [[ ${ret} != 1 ]] && return 0 536 [[ ${ret} != 1 ]] && return 0
500 return 1 537 return 1
501} 538}
502 539
503has_m32() { 540has_m32() {
504 # this doesnt test if the flag is accepted, it tests if the flag 541 die "${FUNCNAME}: don't use this anymore"
505 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
506 # please dont replace this function with test_flag in some future
507 # clean-up!
508
509 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
510
511 local temp=$(emktemp)
512 echo "int main() { return(0); }" > "${temp}".c
513 MY_CC=$(tc-getCC)
514 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
515 local ret=$?
516 rm -f "${temp}".c
517 [[ ${ret} != 1 ]] && return 0
518 return 1
519} 542}
520 543
544# @FUNCTION: replace-sparc64-flags
545# @DESCRIPTION:
546# Sets mcpu to v8 and uses the original value as mtune if none specified.
521replace-sparc64-flags() { 547replace-sparc64-flags() {
522 local SPARC64_CPUS="ultrasparc3 ultrasparc v9" 548 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
523 549
524 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then 550 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
525 for x in ${SPARC64_CPUS}; do 551 for x in ${SPARC64_CPUS}; do
526 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" 552 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
527 done 553 done
528 else 554 else
529 for x in ${SPARC64_CPUS}; do 555 for x in ${SPARC64_CPUS}; do
530 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 556 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
531 done 557 done
532 fi 558 fi
533 559
534 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then 560 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
535 for x in ${SPARC64_CPUS}; do 561 for x in ${SPARC64_CPUS}; do
536 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" 562 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
537 done 563 done
538 else 564 else
539 for x in ${SPARC64_CPUS}; do 565 for x in ${SPARC64_CPUS}; do
540 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 566 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
541 done 567 done
542 fi 568 fi
543 569
544 export CFLAGS CXXFLAGS 570 export CFLAGS CXXFLAGS
545} 571}
546 572
573# @FUNCTION: append-libs
574# @USAGE: <libs>
575# @DESCRIPTION:
576# Add extra <libs> to the current LIBS.
547append-ldflags() { 577append-libs() {
548 [[ -z $* ]] && return 0 578 [[ $# -eq 0 ]] && return 0
549 export LDFLAGS="${LDFLAGS} $*" 579 local flag
550 return 0 580 for flag in "$@"; do
551} 581 [[ ${flag} == -l* ]] && flag=${flag#-l}
582 export LIBS="${LIBS} -l${flag}"
583 done
552 584
553# Remove flags from LDFLAGS - it's up to the ebuild to filter
554# CFLAGS and CXXFLAGS via filter-flags if they need to.
555filter-ldflags() {
556 _filter-var LDFLAGS "$@"
557 return 0 585 return 0
558} 586}
559 587
588# @FUNCTION: raw-ldflags
589# @USAGE: [flags]
590# @DESCRIPTION:
560# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results 591# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
561# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed 592# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
562# to gcc where it needs the '-Wl,'. 593# to gcc where it needs the '-Wl,'.
594#
595# If no flags are specified, then default to ${LDFLAGS}.
563raw-ldflags() { 596raw-ldflags() {
564 local x input="$@" 597 local x input="$@"
565 [[ -z ${input} ]] && input=${LDFLAGS} 598 [[ -z ${input} ]] && input=${LDFLAGS}
566 set -- 599 set --
567 for x in ${input} ; do 600 for x in ${input} ; do
569 set -- "$@" ${x//,/ } 602 set -- "$@" ${x//,/ }
570 done 603 done
571 echo "$@" 604 echo "$@"
572} 605}
573 606
574# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>, 607# @FUNCTION: no-as-needed
575# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more 608# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
576# fixes. 609no-as-needed() {
577#
578# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
579gcc2-flags() {
580 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
581 CFLAGS=${CFLAGS//-mtune=/-mcpu=}
582 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
583 fi
584
585 replace-cpu-flags k6-{2,3} k6
586 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
587
588 replace-cpu-flags pentium-mmx i586
589 replace-cpu-flags pentium{2,3,4} i686
590
591 replace-cpu-flags ev6{7,8} ev6
592
593 export CFLAGS CXXFLAGS
594}
595
596# Gets the flags needed for "NOW" binding
597bindnow-flags() {
598 case $($(tc-getLD) -v 2>&1 </dev/null) in 610 case $($(tc-getLD) -v 2>&1 </dev/null) in
599 *GNU* | *'with BFD'*) # GNU ld 611 *GNU*) # GNU ld
600 echo "-Wl,-z,now" ;; 612 echo "-Wl,--no-as-needed" ;;
601 *Apple*) # Darwin ld
602 echo "-bind_at_load" ;;
603 *)
604 # Some linkers just recognize -V instead of -v
605 case $($(tc-getLD) -V 2>&1 </dev/null) in
606 *Solaris*) # Solaris accept almost the same GNU options
607 echo "-Wl,-z,now" ;;
608 esac
609 ;;
610 esac 613 esac
611} 614}
615
616fi

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