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1# Copyright 1999-2003 Gentoo Technologies, Inc. 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 1.32 2003/12/21 06:50:15 solar Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.159 2011/12/07 06:42:40 vapier Exp $
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.
12
13inherit eutils toolchain-funcs multilib
14
15################ DEPRECATED functions ################
16# The following are still present to avoid breaking existing
17# code more than necessary; however they are deprecated. Please
18# use gcc-specs-* from toolchain-funcs.eclass instead, if you
19# need to know which hardened techs are active in the compiler.
20# See bug #100974
4# 21#
5# Author Bart Verwilst <verwilst@gentoo.org> 22# has_hardened
23# has_pie
24# has_pic
25# has_ssp_all
26# has_ssp
6 27
7ECLASS=flag-o-matic
8INHERITED="$INHERITED $ECLASS"
9 28
10#
11#### filter-flags <flags> ####
12# Remove particular flags from C[XX]FLAGS
13# Matches only complete flags
14#
15#### append-flags <flags> ####
16# Add extra flags to your current C[XX]FLAGS
17#
18#### replace-flags <orig.flag> <new.flag> ###
19# Replace a flag by another one
20#
21#### is-flag <flag> ####
22# Returns "true" if flag is set in C[XX]FLAGS
23# Matches only complete a flag
24#
25#### strip-flags ####
26# Strip C[XX]FLAGS of everything except known
27# good options.
28#
29#### strip-unsupported-flags ####
30# Strip C[XX]FLAGS of any flags not supported by
31# installed version of gcc
32#
33#### get-flag <flag> ####
34# Find and echo the value for a particular flag
35#
36#### replace-sparc64-flags ####
37# Sets mcpu to v8 and uses the original value
38# as mtune if none specified.
39#
40#### filter-mfpmath <math types> ####
41# Remove specified math types from the fpmath specification
42# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
43# will leave the user with -mfpmath=386
44#
45#### append-ldflags ####
46# Add extra flags to your current LDFLAGS
47#
48#### etexec-flags ####
49# hooked function for hardened-gcc that appends
50# -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
51# and a package is filtering -fPIC,-fpic, -fPIE, -fpie
52#
53#### fstack-flags ####
54# hooked function for hardened-gcc that appends
55# -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
56# and a package is filtering -fstack-protector, -fstack-protector-all
57#
58
59# C[XX]FLAGS that we allow in strip-flags 29# {C,CXX,F,FC}FLAGS that we allow in strip-flags
60ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g" 30# Note: shell globs and character lists are allowed
61case "${ARCH}" in 31setup-allowed-flags() {
62 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;; 32 if [[ -z ${ALLOWED_FLAGS} ]] ; then
63 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 33 export ALLOWED_FLAGS="-pipe"
64 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 34 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
65 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 35 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
66esac 36 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-strict-overflow"
37 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
38 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
39 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident -fpermissive"
40 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -W* -w"
41 fi
42 # allow a bunch of flags that negate features / control ABI
43 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all \
44 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow -fno-omit-frame-pointer"
45 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
46 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-ssse3 -mno-sse4 -mno-sse4.1 \
47 -mno-sse4.2 -mno-avx -mno-aes -mno-pclmul -mno-sse4a -mno-3dnow \
48 -mno-popcnt -mno-abm \
49 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
50 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
51 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
52 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
53 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
54 -m32 -m64 -mx32 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
55 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
56 -msecure-plt -m*-toc -D* -U*"
67 57
58 # 4.5
59 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
60 # 4.6
61 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mno-fsgsbase -mno-rdrnd -mno-f16c \
62 -mno-bmi -mno-tbm"
63
68# C[XX]FLAGS that we are think is ok, but needs testing 64 # {C,CXX,F,FC}FLAGS that we are think is ok, but needs testing
69# NOTE: currently -Os have issues with gcc3 and K6* arch's 65 # NOTE: currently -Os have issues with gcc3 and K6* arch's
70UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays" 66 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
67 return 0
68}
71 69
70# inverted filters for hardened compiler. This is trying to unpick
71# the hardened compiler defaults.
72_filter-hardened() {
73 local f
74 for f in "$@" ; do
75 case "${f}" in
76 # Ideally we should only concern ourselves with PIE flags,
77 # not -fPIC or -fpic, but too many places filter -fPIC without
78 # thinking about -fPIE.
79 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
80 gcc-specs-pie || continue
81 is-flagq -nopie || append-flags -nopie;;
82 -fstack-protector)
83 gcc-specs-ssp || continue
84 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
85 -fstack-protector-all)
86 gcc-specs-ssp-to-all || continue
87 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
88 -fno-strict-overflow)
89 gcc-specs-nostrict || continue
90 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
91 esac
92 done
93}
94
95# Remove occurrences of strings from variable given in $1
96# Strings removed are matched as globs, so for example
97# '-O*' would remove -O1, -O2 etc.
98_filter-var() {
99 local f x VAR VAL
100 declare -a new
101
102 VAR=$1
103 shift
104 eval VAL=\${${VAR}}
105 for f in ${VAL}; do
106 for x in "$@"; do
107 # Note this should work with globs like -O*
108 [[ ${f} == ${x} ]] && continue 2
109 done
110 eval new\[\${\#new\[@]}]=\${f}
111 done
112 eval export ${VAR}=\${new\[*]}
113}
114
115# @FUNCTION: filter-flags
116# @USAGE: <flags>
117# @DESCRIPTION:
118# Remove particular <flags> from {C,CPP,CXX,F,FC}FLAGS. Accepts shell globs.
119filter-flags() {
120 _filter-hardened "$@"
121 _filter-var CFLAGS "$@"
122 _filter-var CPPFLAGS "$@"
123 _filter-var CXXFLAGS "$@"
124 _filter-var FFLAGS "$@"
125 _filter-var FCFLAGS "$@"
126 return 0
127}
128
129# @FUNCTION: filter-lfs-flags
130# @DESCRIPTION:
131# Remove flags that enable Large File Support.
132filter-lfs-flags() {
133 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
134 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
135 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
136 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
137 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
138 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
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.
185append-lfs-flags() {
186 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
187 # see comments in filter-lfs-flags func for meaning of these
188 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
189}
190
191# @FUNCTION: append-flags
192# @USAGE: <flags>
193# @DESCRIPTION:
194# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
195append-flags() {
196 [[ $# -eq 0 ]] && return 0
197 append-cflags "$@"
198 append-cxxflags "$@"
199 append-fflags "$@"
200 return 0
201}
202
203# @FUNCTION: replace-flags
204# @USAGE: <old> <new>
205# @DESCRIPTION:
206# Replace the <old> flag with <new>. Accepts shell globs for <old>.
207replace-flags() {
208 [[ $# != 2 ]] \
209 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
210 && die "replace-flags takes 2 arguments, not $#"
211
212 local f fset
213 declare -a new_CFLAGS new_CXXFLAGS new_FFLAGS new_FCFLAGS
214
215 for fset in CFLAGS CXXFLAGS FFLAGS FCFLAGS; do
216 # Looping over the flags instead of using a global
217 # substitution ensures that we're working with flag atoms.
218 # Otherwise globs like -O* have the potential to wipe out the
219 # list of flags.
220 for f in ${!fset}; do
221 # Note this should work with globs like -O*
222 [[ ${f} == ${1} ]] && f=${2}
223 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
224 done
225 eval export ${fset}=\${new_${fset}\[*]}
226 done
227
228 return 0
229}
230
231# @FUNCTION: replace-cpu-flags
232# @USAGE: <old> <new>
233# @DESCRIPTION:
234# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
235# with flags that select the <new> cpu. Accepts shell globs for <old>.
236replace-cpu-flags() {
237 local newcpu="$#" ; newcpu="${!newcpu}"
238 while [ $# -gt 1 ] ; do
239 # quote to make sure that no globbing is done (particularly on
240 # ${oldcpu}) prior to calling replace-flags
241 replace-flags "-march=${1}" "-march=${newcpu}"
242 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
243 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
244 shift
245 done
246 return 0
247}
248
249_is_flagq() {
250 local x
251 for x in ${!1} ; do
252 [[ ${x} == $2 ]] && return 0
253 done
254 return 1
255}
256
257# @FUNCTION: is-flagq
258# @USAGE: <flag>
259# @DESCRIPTION:
260# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
261is-flagq() {
262 [[ -n $2 ]] && die "Usage: is-flag <flag>"
263 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1 || _is_flagq FFLAGS $1 || _is_flagq FCFLAGS $1
264}
265
266# @FUNCTION: is-flag
267# @USAGE: <flag>
268# @DESCRIPTION:
269# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
270is-flag() {
271 is-flagq "$@" && echo true
272}
273
274# @FUNCTION: is-ldflagq
275# @USAGE: <flag>
276# @DESCRIPTION:
277# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
278is-ldflagq() {
279 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
280 _is_flagq LDFLAGS $1
281}
282
283# @FUNCTION: is-ldflag
284# @USAGE: <flag>
285# @DESCRIPTION:
286# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
287is-ldflag() {
288 is-ldflagq "$@" && echo true
289}
290
291# @FUNCTION: filter-mfpmath
292# @USAGE: <math types>
293# @DESCRIPTION:
294# Remove specified math types from the fpmath flag. For example, if the user
295# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
296# -mfpmath=386.
72filter-mfpmath() { 297filter-mfpmath() {
73 for a in $CFLAGS; do 298 local orig_mfpmath new_math prune_math
74 if [ "${a:0:8}" == "-mfpmath" ]; then
75 orig_mfpmath=$a
76 fi
77 done
78 299
79 mfpmath="$( echo $orig_mfpmath | awk -F '=' '{print $2}' | tr "," " " )" 300 # save the original -mfpmath flag
80 for b in $@; do 301 orig_mfpmath=$(get-flag -mfpmath)
81 mfpmath="${mfpmath/$b}" 302 # get the value of the current -mfpmath flag
303 new_math=$(get-flag mfpmath)
304 new_math=" ${new_math//,/ } "
305 # figure out which math values are to be removed
306 prune_math=""
307 for prune_math in "$@" ; do
308 new_math=${new_math/ ${prune_math} / }
82 done 309 done
310 new_math=$(echo ${new_math})
311 new_math=${new_math// /,}
83 312
84 if [ -z "${mfpmath/ }" ]; then 313 if [[ -z ${new_math} ]] ; then
314 # if we're removing all user specified math values are
315 # slated for removal, then we just filter the flag
85 filter-flags "$orig_mfpmath" 316 filter-flags ${orig_mfpmath}
86 else 317 else
87 new_mfpmath="-mfpmath=$( echo $mfpmath | sed -e "s/ /,/g" -e "s/,,/,/g" )" 318 # if we only want to filter some of the user specified
88 replace-flags "$orig_mfpmath" "$new_mfpmath" 319 # math values, then we replace the current flag
320 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
89 fi 321 fi
90}
91
92filter-flags() {
93 # we do two loops to avoid the first and last char from being chomped.
94 for x in $@ ; do
95 case "${x}" in
96 -fPIC|-fpic|-fPIE|-fpie) etexec-flags;;
97 -fstack-protector|-fstack-protector-all) fstack-flags;;
98 *) ;;
99 esac
100 done
101 # we do this fancy spacing stuff so as to not filter
102 # out part of a flag ... we want flag atoms ! :D
103 CFLAGS=" ${CFLAGS} "
104 CXXFLAGS=" ${CXXFLAGS} "
105 for x in $@ ; do
106 CFLAGS="${CFLAGS/ ${x} / }"
107 CXXFLAGS="${CXXFLAGS/ ${x} / }"
108 done
109 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
110 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
111}
112
113append-flags() {
114 CFLAGS="${CFLAGS} $@"
115 CXXFLAGS="${CXXFLAGS} $@"
116 for x in $@; do
117 [ "${x}" = "-fno-stack-protector" -o "${x}" = "-fno-stack-protector-all" ] && fstack-flags
118 done
119 return 0
120}
121
122replace-flags() {
123 CFLAGS="${CFLAGS/${1}/${2} }"
124 CXXFLAGS="${CXXFLAGS/${1}/${2} }"
125 return 0
126}
127
128is-flag() {
129 for x in ${CFLAGS} ${CXXFLAGS} ; do
130 if [ "${x}" == "$1" ] ; then
131 echo true
132 return 0 322 return 0
133 fi
134 done
135 return 1
136} 323}
137 324
325# @FUNCTION: strip-flags
326# @DESCRIPTION:
327# Strip C[XX]FLAGS of everything except known good/safe flags.
138strip-flags() { 328strip-flags() {
329 local x y flag NEW_CFLAGS NEW_CXXFLAGS NEW_FFLAGS NEW_FCFLAGS
330
331 setup-allowed-flags
332
139 local NEW_CFLAGS="" 333 local NEW_CFLAGS=""
140 local NEW_CXXFLAGS="" 334 local NEW_CXXFLAGS=""
335 local NEW_FFLAGS=""
336 local NEW_FCFLAGS=""
141 337
142 # Allow unstable C[XX]FLAGS if we are using unstable profile ... 338 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
143 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then 339 if has "~$(tc-arch)" ${ACCEPT_KEYWORDS} ; then
144 [ `use debug` ] && einfo "Enabling the use of some unstable flags"
145 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" 340 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
146 fi 341 fi
147 342
148 set -f 343 set -f # disable pathname expansion
149 344
150 for x in ${CFLAGS} 345 for x in ${CFLAGS}; do
151 do
152 for y in ${ALLOWED_FLAGS} 346 for y in ${ALLOWED_FLAGS}; do
153 do
154 flag=${x%%=*} 347 flag=${x%%=*}
155 if [ "${flag%%${y}}" = "" ] 348 if [ "${flag%%${y}}" = "" ] ; then
156 then
157 NEW_CFLAGS="${NEW_CFLAGS} ${x}" 349 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
158 break 350 break
159 fi 351 fi
160 done 352 done
161 done 353 done
162 354
163 for x in ${CXXFLAGS} 355 for x in ${CXXFLAGS}; do
164 do
165 for y in ${ALLOWED_FLAGS} 356 for y in ${ALLOWED_FLAGS}; do
166 do
167 flag=${x%%=*} 357 flag=${x%%=*}
168 if [ "${flag%%${y}}" = "" ] 358 if [ "${flag%%${y}}" = "" ] ; then
169 then
170 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}" 359 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
171 break 360 break
172 fi 361 fi
173 done 362 done
174 done 363 done
175 364
365 for x in ${FFLAGS}; do
366 for y in ${ALLOWED_FLAGS}; do
367 flag=${x%%=*}
368 if [ "${flag%%${y}}" = "" ] ; then
369 NEW_FFLAGS="${NEW_FFLAGS} ${x}"
370 break
371 fi
372 done
373 done
374
375 for x in ${FCFLAGS}; do
376 for y in ${ALLOWED_FLAGS}; do
377 flag=${x%%=*}
378 if [ "${flag%%${y}}" = "" ] ; then
379 NEW_FCFLAGS="${NEW_FCFLAGS} ${x}"
380 break
381 fi
382 done
383 done
384
176 # In case we filtered out all optimization flags fallback to -O2 385 # In case we filtered out all optimization flags fallback to -O2
177 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then 386 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
178 NEW_CFLAGS="${NEW_CFLAGS} -O2" 387 NEW_CFLAGS="${NEW_CFLAGS} -O2"
179 fi 388 fi
180 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then 389 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
181 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2" 390 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
182 fi 391 fi
392 if [ "${FFLAGS/-O}" != "${FFLAGS}" -a "${NEW_FFLAGS/-O}" = "${NEW_FFLAGS}" ]; then
393 NEW_FFLAGS="${NEW_FFLAGS} -O2"
394 fi
395 if [ "${FCFLAGS/-O}" != "${FCFLAGS}" -a "${NEW_FCFLAGS/-O}" = "${NEW_FCFLAGS}" ]; then
396 NEW_FCFLAGS="${NEW_FCFLAGS} -O2"
397 fi
183 398
184 set +f 399 set +f # re-enable pathname expansion
185
186 [ `use debug` ] \
187 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
188 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
189 400
190 export CFLAGS="${NEW_CFLAGS}" 401 export CFLAGS="${NEW_CFLAGS}"
191 export CXXFLAGS="${NEW_CXXFLAGS}" 402 export CXXFLAGS="${NEW_CXXFLAGS}"
403 export FFLAGS="${NEW_FFLAGS}"
404 export FCFLAGS="${NEW_FCFLAGS}"
405 return 0
192} 406}
193 407
194test_flag () { 408test-flag-PROG() {
195 if gcc -S -xc $1 -o /dev/null /dev/null >/dev/null 2>&1; then 409 local comp=$1
196 echo "$1" 410 local flags="$2"
197 fi
198}
199 411
412 [[ -z ${comp} || -z ${flags} ]] && return 1
413
414 # use -c so we can test the assembler as well
415 local PROG=$(tc-get${comp})
416 ${PROG} ${flags} -c -o /dev/null -xc /dev/null \
417 > /dev/null 2>&1
418}
419
420# @FUNCTION: test-flag-CC
421# @USAGE: <flag>
422# @DESCRIPTION:
423# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
424test-flag-CC() { test-flag-PROG "CC" "$1"; }
425
426# @FUNCTION: test-flag-CXX
427# @USAGE: <flag>
428# @DESCRIPTION:
429# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
430test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
431
432# @FUNCTION: test-flag-F77
433# @USAGE: <flag>
434# @DESCRIPTION:
435# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
436test-flag-F77() { test-flag-PROG "F77" "$1"; }
437
438# @FUNCTION: test-flag-FC
439# @USAGE: <flag>
440# @DESCRIPTION:
441# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
442test-flag-FC() { test-flag-PROG "FC" "$1"; }
443
444test-flags-PROG() {
445 local comp=$1
446 local flags
447 local x
448
449 shift
450
451 [[ -z ${comp} ]] && return 1
452
453 for x in "$@" ; do
454 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
455 done
456
457 echo "${flags}"
458
459 # Just bail if we dont have any flags
460 [[ -n ${flags} ]]
461}
462
463# @FUNCTION: test-flags-CC
464# @USAGE: <flags>
465# @DESCRIPTION:
466# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
467test-flags-CC() { test-flags-PROG "CC" "$@"; }
468
469# @FUNCTION: test-flags-CXX
470# @USAGE: <flags>
471# @DESCRIPTION:
472# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
473test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
474
475# @FUNCTION: test-flags-F77
476# @USAGE: <flags>
477# @DESCRIPTION:
478# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
479test-flags-F77() { test-flags-PROG "F77" "$@"; }
480
481# @FUNCTION: test-flags-FC
482# @USAGE: <flags>
483# @DESCRIPTION:
484# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
485test-flags-FC() { test-flags-PROG "FC" "$@"; }
486
487# @FUNCTION: test-flags
488# @USAGE: <flags>
489# @DESCRIPTION:
490# Short-hand that should hopefully work for both C and C++ compiler, but
491# its really only present due to the append-flags() abomination.
492test-flags() { test-flags-CC "$@"; }
493
494# @FUNCTION: test_version_info
495# @USAGE: <version>
496# @DESCRIPTION:
497# Returns shell true if the current C compiler version matches <version>, else returns shell false.
498# Accepts shell globs.
499test_version_info() {
500 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
501 return 0
502 else
503 return 1
504 fi
505}
506
507# @FUNCTION: strip-unsupported-flags
508# @DESCRIPTION:
509# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
200strip-unsupported-flags() { 510strip-unsupported-flags() {
201 for x in ${CFLAGS} 511 export CFLAGS=$(test-flags-CC ${CFLAGS})
202 do 512 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
203 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`" 513 export FFLAGS=$(test-flags-F77 ${FFLAGS})
204 done 514 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
205
206 for x in ${CXXFLAGS}
207 do
208 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
209 done
210
211 CFLAGS="${NEW_CFLAGS}"
212 CXXFLAGS="${NEW_CXXFLAGS}"
213} 515}
214 516
517# @FUNCTION: get-flag
518# @USAGE: <flag>
519# @DESCRIPTION:
520# Find and echo the value for a particular flag. Accepts shell globs.
215get-flag() { 521get-flag() {
216 local findflag="$1" 522 local f findflag="$1"
523
524 # this code looks a little flaky but seems to work for
525 # everything we want ...
526 # for example, if CFLAGS="-march=i686":
527 # `get-flag -march` == "-march=i686"
528 # `get-flag march` == "i686"
217 for f in ${CFLAGS} ${CXXFLAGS} ; do 529 for f in ${CFLAGS} ${CXXFLAGS} ${FFLAGS} ${FCFLAGS} ; do
218 if [ "${f/${findflag}}" != "${f}" ] ; then 530 if [ "${f/${findflag}}" != "${f}" ] ; then
219 echo "${f/-${findflag}=}" 531 printf "%s\n" "${f/-${findflag}=}"
220 return 0 532 return 0
221 fi 533 fi
222 done 534 done
223 return 1 535 return 1
224} 536}
225 537
538# DEAD FUNCS. Remove by Dec 2011.
539test_flag() { die "$0: deprecated, please use test-flags()!" ; }
540has_hardened() { die "$0: deprecated, please use gcc-specs-{relro,now}()!" ; }
541has_pic() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
542has_pie() { die "$0: deprecated, please use gcc-specs-pie()!" ; }
543has_ssp_all() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
544has_ssp() { die "$0: deprecated, please use gcc-specs-ssp()!" ; }
545
546# @FUNCTION: has_m64
547# @DESCRIPTION:
548# This doesn't test if the flag is accepted, it tests if the flag actually
549# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
550# return code is 0, else the return code is 1.
551has_m64() {
552 # this doesnt test if the flag is accepted, it tests if the flag
553 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
554 # please dont replace this function with test_flag in some future
555 # clean-up!
556
557 local temp="$(emktemp)"
558 echo "int main() { return(0); }" > "${temp}".c
559 MY_CC=$(tc-getCC)
560 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
561 local ret=$?
562 rm -f "${temp}".c
563 [[ ${ret} != 1 ]] && return 0
564 return 1
565}
566
567# @FUNCTION: has_m32
568# @DESCRIPTION:
569# This doesn't test if the flag is accepted, it tests if the flag actually
570# WORKS. Non-mulilib gcc will take both -m32 and -64. If the flag works return
571# code is 0, else return code is 1.
572has_m32() {
573 # this doesnt test if the flag is accepted, it tests if the flag
574 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
575 # please dont replace this function with test_flag in some future
576 # clean-up!
577
578 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
579
580 local temp=$(emktemp)
581 echo "int main() { return(0); }" > "${temp}".c
582 MY_CC=$(tc-getCC)
583 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
584 local ret=$?
585 rm -f "${temp}".c
586 [[ ${ret} != 1 ]] && return 0
587 return 1
588}
589
590# @FUNCTION: replace-sparc64-flags
591# @DESCRIPTION:
592# Sets mcpu to v8 and uses the original value as mtune if none specified.
226replace-sparc64-flags() { 593replace-sparc64-flags() {
227 local SPARC64_CPUS="ultrasparc v9" 594 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
228 595
229 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ] 596 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
230 then
231 for x in ${SPARC64_CPUS} 597 for x in ${SPARC64_CPUS}; do
232 do
233 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" 598 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
234 done 599 done
235 else 600 else
236 for x in ${SPARC64_CPUS} 601 for x in ${SPARC64_CPUS}; do
237 do
238 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 602 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
239 done 603 done
240 fi 604 fi
241 605
242 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ] 606 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
243 then
244 for x in ${SPARC64_CPUS} 607 for x in ${SPARC64_CPUS}; do
245 do
246 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" 608 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
247 done 609 done
248 else 610 else
249 for x in ${SPARC64_CPUS} 611 for x in ${SPARC64_CPUS}; do
250 do
251 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 612 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
252 done 613 done
253 fi 614 fi
254}
255 615
616 export CFLAGS CXXFLAGS
617}
618
619# @FUNCTION: append-libs
620# @USAGE: <libs>
621# @DESCRIPTION:
622# Add extra <libs> to the current LIBS.
623append-libs() {
624 [[ $# -eq 0 ]] && return 0
625 local flag
626 for flag in "$@"; do
627 [[ ${flag} == -l* ]] && flag=${flag#-l}
628 export LIBS="${LIBS} -l${flag}"
629 done
630
631 return 0
632}
633
634# @FUNCTION: append-ldflags
635# @USAGE: <flags>
636# @DESCRIPTION:
637# Add extra <flags> to the current LDFLAGS.
256append-ldflags() { 638append-ldflags() {
639 [[ $# -eq 0 ]] && return 0
640 local flag
641 for flag in "$@"; do
642 [[ ${flag} == -l* ]] && \
643 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
644 done
645
257 LDFLAGS="${LDFLAGS} $@" 646 export LDFLAGS="${LDFLAGS} $*"
258 return 0 647 return 0
259} 648}
260 649
261etexec-flags() { 650# @FUNCTION: filter-ldflags
262 has_version 'sys-devel/hardened-gcc' && { 651# @USAGE: <flags>
263 debug-print ">>> appending flags -yet_exec" 652# @DESCRIPTION:
264 append-flags -yet_exec 653# Remove particular <flags> from LDFLAGS. Accepts shell globs.
265 append-ldflags -yet_exec 654filter-ldflags() {
266 } 655 _filter-var LDFLAGS "$@"
656 return 0
267} 657}
268 658
269fstack-flags() { 659# @FUNCTION: raw-ldflags
270 has_version 'sys-devel/hardened-gcc' && { 660# @USAGE: [flags]
271 debug-print ">>> appending flags -yno_propolice" 661# @DESCRIPTION:
272 append-flags -yno_propolice 662# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
273 append-ldflags -yno_propolice 663# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
274 } 664# to gcc where it needs the '-Wl,'.
665#
666# If no flags are specified, then default to ${LDFLAGS}.
667raw-ldflags() {
668 local x input="$@"
669 [[ -z ${input} ]] && input=${LDFLAGS}
670 set --
671 for x in ${input} ; do
672 x=${x#-Wl,}
673 set -- "$@" ${x//,/ }
674 done
675 echo "$@"
275} 676}
677
678# @FUNCTION: no-as-needed
679# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
680no-as-needed() {
681 case $($(tc-getLD) -v 2>&1 </dev/null) in
682 *GNU*) # GNU ld
683 echo "-Wl,--no-as-needed" ;;
684 esac
685}
686
687# Some tests for when we screw with things and want to make
688# sure we didn't break anything
689#TESTS() {
690# CFLAGS="-a -b -c=1"
691# CXXFLAGS="-x -y -z=2"
692# LDFLAGS="-l -m -n=3"
693#
694# die() { exit 1; }
695# (is-flag 1 2 3) && die
696# (is-ldflag 1 2 3) && die
697#
698# is-flagq -l && die
699# is-ldflagq -a && die
700# is-flagq -a || die
701# is-flagq -x || die
702# is-ldflagq -n=* || die
703# is-ldflagq -n && die
704#
705# strip-unsupported-flags
706# [[ ${CFLAGS} == "-c=1" ]] || die
707# [[ ${CXXFLAGS} == "-y -z=2" ]] || die
708#
709# echo "All tests pass"
710#}
711#TESTS

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