/[gentoo-x86]/eclass/flag-o-matic.eclass
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1# Copyright 1999-2005 Gentoo Foundation 1# Copyright 1999-2011 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 1.87 2005/06/24 22:06:19 vapier Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.161 2011/12/15 05:23:15 vapier Exp $
4 4
5ECLASS=flag-o-matic 5# @ECLASS: flag-o-matic.eclass
6INHERITED="$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.
7 12
8# need access to emktemp() 13if [[ ${___ECLASS_ONCE_FLAG_O_MATIC} != "recur -_+^+_- spank" ]] ; then
14___ECLASS_ONCE_FLAG_O_MATIC="recur -_+^+_- spank"
15
9inherit eutils toolchain-funcs multilib 16inherit eutils toolchain-funcs multilib
10 17
18################ DEPRECATED functions ################
19# The following are still present to avoid breaking existing
20# code more than necessary; however they are deprecated. Please
21# use gcc-specs-* from toolchain-funcs.eclass instead, if you
22# need to know which hardened techs are active in the compiler.
23# See bug #100974
11# 24#
12#### filter-flags <flags> #### 25# has_hardened
13# Remove particular flags from C[XX]FLAGS 26# has_pie
14# Matches only complete flags 27# has_pic
15#
16#### append-flags <flags> ####
17# Add extra flags to your current C[XX]FLAGS
18#
19#### replace-flags <orig.flag> <new.flag> ###
20# Replace a flag by another one
21#
22#### replace-cpu-flags <old.cpus> <new.cpu> ###
23# Replace march/mcpu flags that specify <old.cpus>
24# with flags that specify <new.cpu>
25#
26#### is-flag <flag> ####
27# Returns "true" if flag is set in C[XX]FLAGS
28# Matches only complete a flag
29#
30#### strip-flags ####
31# Strip C[XX]FLAGS of everything except known
32# good options.
33#
34#### strip-unsupported-flags ####
35# Strip C[XX]FLAGS of any flags not supported by
36# installed version of gcc
37#
38#### get-flag <flag> ####
39# Find and echo the value for a particular flag
40#
41#### replace-sparc64-flags ####
42# Sets mcpu to v8 and uses the original value
43# as mtune if none specified.
44#
45#### filter-mfpmath <math types> ####
46# Remove specified math types from the fpmath specification
47# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
48# will leave the user with -mfpmath=386
49#
50#### append-ldflags ####
51# Add extra flags to your current LDFLAGS
52#
53#### filter-ldflags <flags> ####
54# Remove particular flags from LDFLAGS
55# Matches only complete flags
56#
57#### fstack-flags ####
58# hooked function for hardened gcc that appends
59# -fno-stack-protector to {C,CXX,LD}FLAGS
60# when a package is filtering -fstack-protector, -fstack-protector-all
61# notice: modern automatic specs files will also suppress -fstack-protector-all
62# when only -fno-stack-protector is given
63#
64#### has_pic ####
65# Returns true if the compiler by default or with current CFLAGS
66# builds position-independent code.
67#
68#### has_ssp_all #### 28# has_ssp_all
69# Returns true if the compiler by default or with current CFLAGS 29# has_ssp
70# generates stack smash protections for all functions
71#
72#### has_ssp ####
73# Returns true if the compiler by default or with current CFLAGS
74# generates stack smash protections for most vulnerable functions
75#
76 30
31
77# C[XX]FLAGS that we allow in strip-flags 32# {C,CXX,F,FC}FLAGS that we allow in strip-flags
33# Note: shell globs and character lists are allowed
78setup-allowed-flags() { 34setup-allowed-flags() {
79 if [[ -z ${ALLOWED_FLAGS} ]] ; then 35 if [[ -z ${ALLOWED_FLAGS} ]] ; then
80 export ALLOWED_FLAGS="-pipe" 36 export ALLOWED_FLAGS="-pipe"
81 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune" 37 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
82 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all" 38 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
83 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking" 39 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-strict-overflow"
84 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time" 40 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
85 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3" 41 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
42 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident -fpermissive"
43 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -W* -w"
86 fi 44 fi
87 # allow a bunch of flags that negate features / control ABI 45 # allow a bunch of flags that negate features / control ABI
88 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all" 46 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
47 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow -fno-omit-frame-pointer"
89 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \ 48 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
90 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \ 49 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 \
50 -mno-sse4.2 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow \
51 -mno-popcnt -mno-abm \
91 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \ 52 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
92 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \ 53 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
54 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
55 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
93 -mflat -mno-flat -mno-faster-structs -mfaster-structs \ 56 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
94 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \ 57 -m32 -m64 -mx32 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
95 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias" 58 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
59 -msecure-plt -m*-toc -D* -U*"
96 60
61 # 4.5
62 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
63 # 4.6
64 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-fsgsbase -mno-rdrnd -mno-f16c \
65 -mno-bmi -mno-tbm"
66
97 # C[XX]FLAGS that we are think is ok, but needs testing 67 # {C,CXX,F,FC}FLAGS that we are think is ok, but needs testing
98 # NOTE: currently -Os have issues with gcc3 and K6* arch's 68 # NOTE: currently -Os have issues with gcc3 and K6* arch's
99 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays" 69 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
100 return 0 70 return 0
101} 71}
102 72
73# inverted filters for hardened compiler. This is trying to unpick
74# the hardened compiler defaults.
75_filter-hardened() {
76 local f
77 for f in "$@" ; do
78 case "${f}" in
79 # Ideally we should only concern ourselves with PIE flags,
80 # not -fPIC or -fpic, but too many places filter -fPIC without
81 # thinking about -fPIE.
82 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
83 gcc-specs-pie || continue
84 is-flagq -nopie || append-flags -nopie;;
85 -fstack-protector)
86 gcc-specs-ssp || continue
87 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
88 -fstack-protector-all)
89 gcc-specs-ssp-to-all || continue
90 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
91 -fno-strict-overflow)
92 gcc-specs-nostrict || continue
93 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
94 esac
95 done
96}
97
98# Remove occurrences of strings from variable given in $1
99# Strings removed are matched as globs, so for example
100# '-O*' would remove -O1, -O2 etc.
101_filter-var() {
102 local f x VAR VAL
103 declare -a new
104
105 VAR=$1
106 shift
107 eval VAL=\${${VAR}}
108 for f in ${VAL}; do
109 for x in "$@"; do
110 # Note this should work with globs like -O*
111 [[ ${f} == ${x} ]] && continue 2
112 done
113 eval new\[\${\#new\[@]}]=\${f}
114 done
115 eval export ${VAR}=\${new\[*]}
116}
117
118# @FUNCTION: filter-flags
119# @USAGE: <flags>
120# @DESCRIPTION:
121# Remove particular <flags> from {C,CPP,CXX,F,FC}FLAGS. Accepts shell globs.
103filter-flags() { 122filter-flags() {
104 local x f fset 123 _filter-hardened "$@"
105 declare -a new_CFLAGS new_CXXFLAGS 124 _filter-var CFLAGS "$@"
106 125 _filter-var CPPFLAGS "$@"
107 for x in "$@" ; do 126 _filter-var CXXFLAGS "$@"
108 case "${x}" in 127 _filter-var FFLAGS "$@"
109 -fPIC|-fpic|-fPIE|-fpie|-pie) 128 _filter-var FCFLAGS "$@"
110 append-flags `test_flag -fno-pie`;;
111 -fstack-protector|-fstack-protector-all)
112 fstack-flags;;
113 esac
114 done
115
116 for fset in CFLAGS CXXFLAGS; do
117 # Looping over the flags instead of using a global
118 # substitution ensures that we're working with flag atoms.
119 # Otherwise globs like -O* have the potential to wipe out the
120 # list of flags.
121 for f in ${!fset}; do
122 for x in "$@"; do
123 # Note this should work with globs like -O*
124 [[ ${f} == ${x} ]] && continue 2
125 done
126 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
127 done
128 eval export ${fset}=\${new_${fset}\[*]}
129 done
130
131 return 0 129 return 0
132} 130}
133 131
132# @FUNCTION: filter-lfs-flags
133# @DESCRIPTION:
134# Remove flags that enable Large File Support.
134filter-lfs-flags() { 135filter-lfs-flags() {
136 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
137 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
138 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
139 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
140 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
135 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 141 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
136} 142}
137 143
144# @FUNCTION: append-cppflags
145# @USAGE: <flags>
146# @DESCRIPTION:
147# Add extra <flags> to the current CPPFLAGS.
148append-cppflags() {
149 [[ $# -eq 0 ]] && return 0
150 export CPPFLAGS="${CPPFLAGS} $*"
151 return 0
152}
153
154# @FUNCTION: append-cflags
155# @USAGE: <flags>
156# @DESCRIPTION:
157# Add extra <flags> to the current CFLAGS.
158append-cflags() {
159 [[ $# -eq 0 ]] && return 0
160 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
161 return 0
162}
163
164# @FUNCTION: append-cxxflags
165# @USAGE: <flags>
166# @DESCRIPTION:
167# Add extra <flags> to the current CXXFLAGS.
168append-cxxflags() {
169 [[ $# -eq 0 ]] && return 0
170 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
171 return 0
172}
173
174# @FUNCTION: append-fflags
175# @USAGE: <flags>
176# @DESCRIPTION:
177# Add extra <flags> to the current {F,FC}FLAGS.
178append-fflags() {
179 [[ $# -eq 0 ]] && return 0
180 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
181 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
182 return 0
183}
184
185# @FUNCTION: append-lfs-flags
186# @DESCRIPTION:
187# Add flags that enable Large File Support.
138append-lfs-flags() { 188append-lfs-flags() {
189 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
190 # see comments in filter-lfs-flags func for meaning of these
139 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 191 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
140} 192}
141 193
194# @FUNCTION: append-flags
195# @USAGE: <flags>
196# @DESCRIPTION:
197# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
142append-flags() { 198append-flags() {
143 [[ -z $* ]] && return 0 199 [[ $# -eq 0 ]] && return 0
144 export CFLAGS="${CFLAGS} $*" 200 append-cflags "$@"
145 export CXXFLAGS="${CXXFLAGS} $*" 201 append-cxxflags "$@"
146 [ -n "`is-flag -fno-stack-protector`" -o \ 202 append-fflags "$@"
147 -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
148 return 0 203 return 0
149} 204}
150 205
206# @FUNCTION: replace-flags
207# @USAGE: <old> <new>
208# @DESCRIPTION:
209# Replace the <old> flag with <new>. Accepts shell globs for <old>.
151replace-flags() { 210replace-flags() {
211 [[ $# != 2 ]] \
212 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
213 && die "replace-flags takes 2 arguments, not $#"
214
152 local f fset 215 local f fset
153 declare -a new_CFLAGS new_CXXFLAGS 216 declare -a new_CFLAGS new_CXXFLAGS new_FFLAGS new_FCFLAGS
154 217
155 for fset in CFLAGS CXXFLAGS; do 218 for fset in CFLAGS CXXFLAGS FFLAGS FCFLAGS; do
156 # Looping over the flags instead of using a global 219 # Looping over the flags instead of using a global
157 # substitution ensures that we're working with flag atoms. 220 # substitution ensures that we're working with flag atoms.
158 # Otherwise globs like -O* have the potential to wipe out the 221 # Otherwise globs like -O* have the potential to wipe out the
159 # list of flags. 222 # list of flags.
160 for f in ${!fset}; do 223 for f in ${!fset}; do
166 done 229 done
167 230
168 return 0 231 return 0
169} 232}
170 233
234# @FUNCTION: replace-cpu-flags
235# @USAGE: <old> <new>
236# @DESCRIPTION:
237# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
238# with flags that select the <new> cpu. Accepts shell globs for <old>.
171replace-cpu-flags() { 239replace-cpu-flags() {
172 local newcpu="$#" ; newcpu="${!newcpu}" 240 local newcpu="$#" ; newcpu="${!newcpu}"
173 while [ $# -gt 1 ] ; do 241 while [ $# -gt 1 ] ; do
174 # quote to make sure that no globbing is done (particularly on 242 # quote to make sure that no globbing is done (particularly on
175 # ${oldcpu} prior to calling replace-flags 243 # ${oldcpu}) prior to calling replace-flags
176 replace-flags "-march=${1}" "-march=${newcpu}" 244 replace-flags "-march=${1}" "-march=${newcpu}"
177 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}" 245 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
178 replace-flags "-mtune=${1}" "-mtune=${newcpu}" 246 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
179 shift 247 shift
180 done 248 done
181 return 0 249 return 0
182} 250}
183 251
252_is_flagq() {
253 local x
254 for x in ${!1} ; do
255 [[ ${x} == $2 ]] && return 0
256 done
257 return 1
258}
259
260# @FUNCTION: is-flagq
261# @USAGE: <flag>
262# @DESCRIPTION:
263# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
264is-flagq() {
265 [[ -n $2 ]] && die "Usage: is-flag <flag>"
266 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1 || _is_flagq FFLAGS $1 || _is_flagq FCFLAGS $1
267}
268
269# @FUNCTION: is-flag
270# @USAGE: <flag>
271# @DESCRIPTION:
272# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
184is-flag() { 273is-flag() {
185 local x 274 is-flagq "$@" && echo true
186
187 for x in ${CFLAGS} ${CXXFLAGS} ; do
188 # Note this should work with globs like -mcpu=ultrasparc*
189 if [[ ${x} == ${1} ]]; then
190 echo true
191 return 0
192 fi
193 done
194 return 1
195} 275}
196 276
277# @FUNCTION: is-ldflagq
278# @USAGE: <flag>
279# @DESCRIPTION:
280# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
281is-ldflagq() {
282 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
283 _is_flagq LDFLAGS $1
284}
285
286# @FUNCTION: is-ldflag
287# @USAGE: <flag>
288# @DESCRIPTION:
289# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
290is-ldflag() {
291 is-ldflagq "$@" && echo true
292}
293
294# @FUNCTION: filter-mfpmath
295# @USAGE: <math types>
296# @DESCRIPTION:
297# Remove specified math types from the fpmath flag. For example, if the user
298# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
299# -mfpmath=386.
197filter-mfpmath() { 300filter-mfpmath() {
198 local orig_mfpmath new_math prune_math 301 local orig_mfpmath new_math prune_math
199 302
200 # save the original -mfpmath flag 303 # save the original -mfpmath flag
201 orig_mfpmath="`get-flag -mfpmath`" 304 orig_mfpmath=$(get-flag -mfpmath)
202 # get the value of the current -mfpmath flag 305 # get the value of the current -mfpmath flag
203 new_math=" `get-flag mfpmath | tr , ' '` " 306 new_math=$(get-flag mfpmath)
307 new_math=" ${new_math//,/ } "
204 # figure out which math values are to be removed 308 # figure out which math values are to be removed
205 prune_math="" 309 prune_math=""
206 for prune_math in "$@" ; do 310 for prune_math in "$@" ; do
207 new_math="${new_math/ ${prune_math} / }" 311 new_math=${new_math/ ${prune_math} / }
208 done 312 done
209 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" 313 new_math=$(echo ${new_math})
314 new_math=${new_math// /,}
210 315
211 if [ -z "${new_math}" ] ; then 316 if [[ -z ${new_math} ]] ; then
212 # if we're removing all user specified math values are 317 # if we're removing all user specified math values are
213 # slated for removal, then we just filter the flag 318 # slated for removal, then we just filter the flag
214 filter-flags ${orig_mfpmath} 319 filter-flags ${orig_mfpmath}
215 else 320 else
216 # if we only want to filter some of the user specified 321 # if we only want to filter some of the user specified
218 replace-flags ${orig_mfpmath} -mfpmath=${new_math} 323 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
219 fi 324 fi
220 return 0 325 return 0
221} 326}
222 327
328# @FUNCTION: strip-flags
329# @DESCRIPTION:
330# Strip C[XX]FLAGS of everything except known good/safe flags.
223strip-flags() { 331strip-flags() {
224 local x y flag NEW_CFLAGS NEW_CXXFLAGS 332 local x y flag NEW_CFLAGS NEW_CXXFLAGS NEW_FFLAGS NEW_FCFLAGS
225 333
226 setup-allowed-flags 334 setup-allowed-flags
227 335
228 local NEW_CFLAGS="" 336 local NEW_CFLAGS=""
229 local NEW_CXXFLAGS="" 337 local NEW_CXXFLAGS=""
338 local NEW_FFLAGS=""
339 local NEW_FCFLAGS=""
230 340
231 # Allow unstable C[XX]FLAGS if we are using unstable profile ... 341 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
232 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then 342 if has "~$(tc-arch)" ${ACCEPT_KEYWORDS} ; then
233 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" 343 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
234 fi 344 fi
235 345
236 set -f # disable pathname expansion 346 set -f # disable pathname expansion
237 347
253 break 363 break
254 fi 364 fi
255 done 365 done
256 done 366 done
257 367
368 for x in ${FFLAGS}; do
369 for y in ${ALLOWED_FLAGS}; do
370 flag=${x%%=*}
371 if [ "${flag%%${y}}" = "" ] ; then
372 NEW_FFLAGS="${NEW_FFLAGS} ${x}"
373 break
374 fi
375 done
376 done
377
378 for x in ${FCFLAGS}; do
379 for y in ${ALLOWED_FLAGS}; do
380 flag=${x%%=*}
381 if [ "${flag%%${y}}" = "" ] ; then
382 NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
383 break
384 fi
385 done
386 done
387
258 # In case we filtered out all optimization flags fallback to -O2 388 # In case we filtered out all optimization flags fallback to -O2
259 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then 389 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
260 NEW_CFLAGS="${NEW_CFLAGS} -O2" 390 NEW_CFLAGS="${NEW_CFLAGS} -O2"
261 fi 391 fi
262 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then 392 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
263 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2" 393 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
264 fi 394 fi
395 if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
396 NEW_FFLAGS="${NEW_FFLAGS} -O2"
397 fi
398 if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
399 NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
400 fi
265 401
266 set +f # re-enable pathname expansion 402 set +f # re-enable pathname expansion
267 403
268 export CFLAGS="${NEW_CFLAGS}" 404 export CFLAGS="${NEW_CFLAGS}"
269 export CXXFLAGS="${NEW_CXXFLAGS}" 405 export CXXFLAGS="${NEW_CXXFLAGS}"
270 return 0 406 export FFLAGS="${NEW_FFLAGS}"
271} 407 export FCFLAGS="${NEW_FCFLAGS}"
272
273test_flag() {
274 if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
275 printf "%s\n" "$*"
276 return 0 408 return 0
277 fi
278 return 1
279} 409}
280 410
411test-flag-PROG() {
412 local comp=$1
413 local flags="$2"
414
415 [[ -z ${comp} || -z ${flags} ]] && return 1
416
417 # use -c so we can test the assembler as well
418 local PROG=$(tc-get${comp})
419 ${PROG} ${flags} -c -o /dev/null -xc /dev/null \
420 > /dev/null 2>&1
421}
422
423# @FUNCTION: test-flag-CC
424# @USAGE: <flag>
425# @DESCRIPTION:
426# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
427test-flag-CC() { test-flag-PROG "CC" "$1"; }
428
429# @FUNCTION: test-flag-CXX
430# @USAGE: <flag>
431# @DESCRIPTION:
432# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
433test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
434
435# @FUNCTION: test-flag-F77
436# @USAGE: <flag>
437# @DESCRIPTION:
438# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
439test-flag-F77() { test-flag-PROG "F77" "$1"; }
440
441# @FUNCTION: test-flag-FC
442# @USAGE: <flag>
443# @DESCRIPTION:
444# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
445test-flag-FC() { test-flag-PROG "FC" "$1"; }
446
447test-flags-PROG() {
448 local comp=$1
449 local flags
450 local x
451
452 shift
453
454 [[ -z ${comp} ]] && return 1
455
456 for x in "$@" ; do
457 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
458 done
459
460 echo "${flags}"
461
462 # Just bail if we dont have any flags
463 [[ -n ${flags} ]]
464}
465
466# @FUNCTION: test-flags-CC
467# @USAGE: <flags>
468# @DESCRIPTION:
469# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
470test-flags-CC() { test-flags-PROG "CC" "$@"; }
471
472# @FUNCTION: test-flags-CXX
473# @USAGE: <flags>
474# @DESCRIPTION:
475# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
476test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
477
478# @FUNCTION: test-flags-F77
479# @USAGE: <flags>
480# @DESCRIPTION:
481# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
482test-flags-F77() { test-flags-PROG "F77" "$@"; }
483
484# @FUNCTION: test-flags-FC
485# @USAGE: <flags>
486# @DESCRIPTION:
487# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
488test-flags-FC() { test-flags-PROG "FC" "$@"; }
489
490# @FUNCTION: test-flags
491# @USAGE: <flags>
492# @DESCRIPTION:
493# Short-hand that should hopefully work for both C and C++ compiler, but
494# its really only present due to the append-flags() abomination.
495test-flags() { test-flags-CC "$@"; }
496
497# @FUNCTION: test_version_info
498# @USAGE: <version>
499# @DESCRIPTION:
500# Returns shell true if the current C compiler version matches <version>, else returns shell false.
501# Accepts shell globs.
281test_version_info() { 502test_version_info() {
282 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then 503 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
283 return 0 504 return 0
284 else 505 else
285 return 1 506 return 1
286 fi 507 fi
287} 508}
288 509
510# @FUNCTION: strip-unsupported-flags
511# @DESCRIPTION:
512# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
289strip-unsupported-flags() { 513strip-unsupported-flags() {
290 local NEW_CFLAGS NEW_CXXFLAGS 514 export CFLAGS=$(test-flags-CC ${CFLAGS})
291 515 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
292 for x in ${CFLAGS} ; do 516 export FFLAGS=$(test-flags-F77 ${FFLAGS})
293 NEW_CFLAGS="${NEW_CFLAGS} `test_flag ${x}`" 517 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
294 done
295 for x in ${CXXFLAGS} ; do
296 NEW_CXXFLAGS="${NEW_CXXFLAGS} `test_flag ${x}`"
297 done
298
299 export CFLAGS="${NEW_CFLAGS}"
300 export CXXFLAGS="${NEW_CXXFLAGS}"
301} 518}
302 519
520# @FUNCTION: get-flag
521# @USAGE: <flag>
522# @DESCRIPTION:
523# Find and echo the value for a particular flag. Accepts shell globs.
303get-flag() { 524get-flag() {
304 local f findflag="$1" 525 local f findflag="$1"
305 526
306 # this code looks a little flaky but seems to work for 527 # this code looks a little flaky but seems to work for
307 # everything we want ... 528 # everything we want ...
308 # for example, if CFLAGS="-march=i686": 529 # for example, if CFLAGS="-march=i686":
309 # `get-flag -march` == "-march=i686" 530 # `get-flag -march` == "-march=i686"
310 # `get-flag march` == "i686" 531 # `get-flag march` == "i686"
311 for f in ${CFLAGS} ${CXXFLAGS} ; do 532 for f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
312 if [ "${f/${findflag}}" != "${f}" ] ; then 533 if [ "${f/${findflag}}" != "${f}" ] ; then
313 printf "%s\n" "${f/-${findflag}=}" 534 printf "%s\n" "${f/-${findflag}=}"
314 return 0 535 return 0
315 fi 536 fi
316 done 537 done
317 return 1 538 return 1
318} 539}
319 540
320has_hardened() { 541# DEAD FUNCS. Remove by Dec 2011.
321 test_version_info Hardened && return 0 542test_flag() { die "$0: deprecated, please use test-flags()!" ; }
322 # the specs file wont exist unless gcc has GCC_SPECS support 543has_hardened() { die "$0: deprecated, please use gcc-specs-{relro,now}()!" ; }
323 [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \ 544has_pic() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
324 return 0 545has_pie() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
325 return 1 546has_ssp_all() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
326} 547has_ssp() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
327 548
328# indicate whether PIC is set 549# @FUNCTION: has_m64
329has_pic() { 550# @DESCRIPTION:
330 [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0 551# This doesn't test if the flag is accepted, it tests if the flag actually
331 [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0 552# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
332 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0 553# return code is 0, else the return code is 1.
333 return 1
334}
335
336# indicate whether PIE is set
337has_pie() {
338 [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
339 [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
340 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
341 # test PIC while waiting for specs to be updated to generate __PIE__
342 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
343 return 1
344}
345
346# indicate whether code for SSP is being generated for all functions
347has_ssp_all() {
348 # note; this matches only -fstack-protector-all
349 [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
350 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
351 return 1
352}
353
354# indicate whether code for SSP is being generated
355has_ssp() {
356 # note; this matches both -fstack-protector and -fstack-protector-all
357 [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
358 [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
359 return 1
360}
361
362has_m64() { 554has_m64() {
363 # this doesnt test if the flag is accepted, it tests if the flag 555 # this doesnt test if the flag is accepted, it tests if the flag
364 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64! 556 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
365 # please dont replace this function with test_flag in some future 557 # please dont replace this function with test_flag in some future
366 # clean-up! 558 # clean-up!
559
367 local temp="$(emktemp)" 560 local temp="$(emktemp)"
368 echo "int main() { return(0); }" > ${temp}.c 561 echo "int main() { return(0); }" > "${temp}".c
369 MY_CC=$(tc-getCC) 562 MY_CC=$(tc-getCC)
370 ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1 563 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
371 local ret=$? 564 local ret=$?
372 rm -f ${temp}.c 565 rm -f "${temp}".c
373 [ "$ret" != "1" ] && return 0 566 [[ ${ret} != 1 ]] && return 0
374 return 1 567 return 1
375} 568}
376 569
570# @FUNCTION: has_m32
571# @DESCRIPTION:
572# This doesn't test if the flag is accepted, it tests if the flag actually
573# WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
574# code is 0, else return code is 1.
377has_m32() { 575has_m32() {
378 # this doesnt test if the flag is accepted, it tests if the flag 576 # this doesnt test if the flag is accepted, it tests if the flag
379 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64! 577 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
380 # please dont replace this function with test_flag in some future 578 # please dont replace this function with test_flag in some future
381 # clean-up! 579 # clean-up!
382 580
383 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0 581 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
384 582
385 local temp="$(emktemp)" 583 local temp=$(emktemp)
386 echo "int main() { return(0); }" > ${temp}.c 584 echo "int main() { return(0); }" > "${temp}".c
387 MY_CC=$(tc-getCC) 585 MY_CC=$(tc-getCC)
388 ${MY_CC/ .*/} -m32 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1 586 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
389 local ret=$? 587 local ret=$?
390 rm -f ${temp}.c 588 rm -f "${temp}".c
391 [ "$ret" != "1" ] && return 0 589 [[ ${ret} != 1 ]] && return 0
392 return 1 590 return 1
393} 591}
394 592
593# @FUNCTION: replace-sparc64-flags
594# @DESCRIPTION:
595# Sets mcpu to v8 and uses the original value as mtune if none specified.
395replace-sparc64-flags() { 596replace-sparc64-flags() {
396 local SPARC64_CPUS="ultrasparc v9" 597 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
397 598
398 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then 599 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
399 for x in ${SPARC64_CPUS}; do 600 for x in ${SPARC64_CPUS}; do
400 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" 601 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
401 done 602 done
402 else 603 else
403 for x in ${SPARC64_CPUS}; do 604 for x in ${SPARC64_CPUS}; do
404 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 605 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
405 done 606 done
406 fi 607 fi
407 608
408 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then 609 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
409 for x in ${SPARC64_CPUS}; do 610 for x in ${SPARC64_CPUS}; do
410 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" 611 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
411 done 612 done
412 else 613 else
413 for x in ${SPARC64_CPUS}; do 614 for x in ${SPARC64_CPUS}; do
414 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 615 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
415 done 616 done
416 fi 617 fi
417 618
418 export CFLAGS CXXFLAGS 619 export CFLAGS CXXFLAGS
419} 620}
420 621
622# @FUNCTION: append-libs
623# @USAGE: <libs>
624# @DESCRIPTION:
625# Add extra <libs> to the current LIBS.
626append-libs() {
627 [[ $# -eq 0 ]] && return 0
628 local flag
629 for flag in "$@"; do
630 [[ ${flag} == -l* ]] && flag=${flag#-l}
631 export LIBS="${LIBS} -l${flag}"
632 done
633
634 return 0
635}
636
637# @FUNCTION: append-ldflags
638# @USAGE: <flags>
639# @DESCRIPTION:
640# Add extra <flags> to the current LDFLAGS.
421append-ldflags() { 641append-ldflags() {
642 [[ $# -eq 0 ]] && return 0
643 local flag
644 for flag in "$@"; do
645 [[ ${flag} == -l* ]] && \
646 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
647 done
648
422 export LDFLAGS="${LDFLAGS} $*" 649 export LDFLAGS="${LDFLAGS} $*"
423 return 0 650 return 0
424} 651}
425 652
653# @FUNCTION: filter-ldflags
654# @USAGE: <flags>
655# @DESCRIPTION:
656# Remove particular <flags> from LDFLAGS. Accepts shell globs.
426filter-ldflags() { 657filter-ldflags() {
427 local x 658 _filter-var LDFLAGS "$@"
428
429 # we do this fancy spacing stuff so as to not filter
430 # out part of a flag ... we want flag atoms ! :D
431 LDFLAGS=" ${LDFLAGS} "
432 for x in "$@" ; do
433 LDFLAGS=${LDFLAGS// ${x} / }
434 done
435 [[ -z ${LDFLAGS// } ]] \
436 && LDFLAGS="" \
437 || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
438 export LDFLAGS
439 return 0 659 return 0
440} 660}
441 661
442fstack-flags() { 662# @FUNCTION: raw-ldflags
443 if has_ssp; then 663# @USAGE: [flags]
444 [ -z "`is-flag -fno-stack-protector`" ] && 664# @DESCRIPTION:
445 export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`" 665# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
446 fi 666# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
447 return 0 667# to gcc where it needs the '-Wl,'.
448}
449
450# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
451# bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
452# fixes.
453# 668#
454# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3 669# If no flags are specified, then default to ${LDFLAGS}.
455gcc2-flags() { 670raw-ldflags() {
456 if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then 671 local x input="$@"
457 CFLAGS=${CFLAGS//-mtune=/-mcpu=} 672 [[ -z ${input} ]] && input=${LDFLAGS}
458 CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=} 673 set --
674 for x in ${input} ; do
675 x=${x#-Wl,}
676 set -- "$@" ${x//,/ }
677 done
678 echo "$@"
679}
680
681# @FUNCTION: no-as-needed
682# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
683no-as-needed() {
684 case $($(tc-getLD) -v 2>&1 </dev/null) in
685 *GNU*) # GNU ld
686 echo "-Wl,--no-as-needed" ;;
687 esac
688}
689
459 fi 690fi
460
461 replace-cpu-flags k6-{2,3} k6
462 replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
463
464 replace-cpu-flags pentium-mmx i586
465 replace-cpu-flags pentium{2,3,4} i686
466
467 replace-cpu-flags ev6{7,8} ev6
468
469 export CFLAGS CXXFLAGS
470}

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