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Revision 1.40 Revision 1.167
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 1.40 2004/03/12 11:21:15 vapier Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.167 2012/01/14 09:10:54 vapier Exp $
4#
5# Author Bart Verwilst <verwilst@gentoo.org>
6 4
7ECLASS=flag-o-matic 5# @ECLASS: flag-o-matic.eclass
8INHERITED="$INHERITED $ECLASS" 6# @MAINTAINER:
7# toolchain@gentoo.org
8# @BLURB: common functions to manipulate and query toolchain flags
9# @DESCRIPTION:
10# This eclass contains a suite of functions to help developers sanely
11# and safely manage toolchain flags in their builds.
9 12
10# 13if [[ ${___ECLASS_ONCE_FLAG_O_MATIC} != "recur -_+^+_- spank" ]] ; then
11#### filter-flags <flags> #### 14___ECLASS_ONCE_FLAG_O_MATIC="recur -_+^+_- spank"
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#### replace-cpu-flags <new.cpu> <old.cpus> ###
22# Replace march/mcpu flags that specify <old.cpus>
23# with flags that specify <new.cpu>
24#
25#### is-flag <flag> ####
26# Returns "true" if flag is set in C[XX]FLAGS
27# Matches only complete a flag
28#
29#### strip-flags ####
30# Strip C[XX]FLAGS of everything except known
31# good options.
32#
33#### strip-unsupported-flags ####
34# Strip C[XX]FLAGS of any flags not supported by
35# installed version of gcc
36#
37#### get-flag <flag> ####
38# Find and echo the value for a particular flag
39#
40#### replace-sparc64-flags ####
41# Sets mcpu to v8 and uses the original value
42# as mtune if none specified.
43#
44#### filter-mfpmath <math types> ####
45# Remove specified math types from the fpmath specification
46# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
47# will leave the user with -mfpmath=386
48#
49#### append-ldflags ####
50# Add extra flags to your current LDFLAGS
51#
52#### etexec-flags ####
53# hooked function for hardened-gcc that appends
54# -yet_exec {C,CXX,LD}FLAGS when hardened-gcc is installed
55# and a package is filtering -fPIC,-fpic, -fPIE, -fpie
56#
57#### fstack-flags ####
58# hooked function for hardened-gcc that appends
59# -yno_propolice to {C,CXX,LD}FLAGS when hardened-gcc is installed
60# and a package is filtering -fstack-protector, -fstack-protector-all
61#
62 15
16inherit eutils toolchain-funcs multilib
17
18# Return all the flag variables that our high level funcs operate on.
19all-flag-vars() {
20 echo {C,CPP,CXX,F,FC,LD}FLAGS
21}
22
63# C[XX]FLAGS that we allow in strip-flags 23# {C,CXX,F,FC}FLAGS that we allow in strip-flags
24# Note: shell globs and character lists are allowed
64setup-allowed-flags() { 25setup-allowed-flags() {
65 export ALLOWED_FLAGS="-O -O1 -O2 -mcpu -march -mtune -fstack-protector -pipe -g" 26 ALLOWED_FLAGS="-pipe"
27 ALLOWED_FLAGS+=" -O -O1 -O2 -Os -mcpu -march -mtune"
28 ALLOWED_FLAGS+=" -fstack-protector -fstack-protector-all"
29 ALLOWED_FLAGS+=" -fbounds-checking -fno-strict-overflow"
30 ALLOWED_FLAGS+=" -fno-PIE -fno-pie -fno-unit-at-a-time"
31 ALLOWED_FLAGS+=" -g -g[0-9] -ggdb -ggdb[0-9] -gstabs -gstabs+"
32 ALLOWED_FLAGS+=" -fno-ident -fpermissive"
33 ALLOWED_FLAGS+=" -W* -w"
34
35 # allow a bunch of flags that negate features / control ABI
36 ALLOWED_FLAGS+=" -fno-stack-protector -fno-stack-protector-all \
37 -fno-strict-aliasing -fno-bounds-checking -fstrict-overflow \
38 -fno-omit-frame-pointer"
39 ALLOWED_FLAGS+=" -mregparm -mno-app-regs -mapp-regs -mno-mmx -mno-sse \
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 \
42 -mno-abm -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 -mplt \
43 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
44 -mieee -mieee-with-inexact -mschedule -mfloat-gprs -mspe -mno-spe \
45 -mtls-direct-seg-refs -mno-tls-direct-seg-refs -mflat -mno-flat \
46 -mno-faster-structs -mfaster-structs -m32 -m64 -mx32 -mabi \
47 -mlittle-endian -mbig-endian -EL -EB -fPIC -mlive-g0 -mcmodel \
48 -mstack-bias -mno-stack-bias -msecure-plt -m*-toc -D* -U*"
49
50 # 4.5
51 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
52 # 4.6
53 ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
54
55 export ALLOWED_FLAGS
56 return 0
57}
58
59# inverted filters for hardened compiler. This is trying to unpick
60# the hardened compiler defaults.
61_filter-hardened() {
62 local f
63 for f in "$@" ; do
66 case "${ARCH}" in 64 case "${f}" in
67 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;; 65 # Ideally we should only concern ourselves with PIE flags,
68 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 66 # not -fPIC or -fpic, but too many places filter -fPIC without
69 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 67 # thinking about -fPIE.
70 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 68 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
69 gcc-specs-pie || continue
70 is-flagq -nopie || append-flags -nopie;;
71 -fstack-protector)
72 gcc-specs-ssp || continue
73 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
74 -fstack-protector-all)
75 gcc-specs-ssp-to-all || continue
76 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
77 -fno-strict-overflow)
78 gcc-specs-nostrict || continue
79 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
71 esac 80 esac
72 81 done
73 # C[XX]FLAGS that we are think is ok, but needs testing
74 # NOTE: currently -Os have issues with gcc3 and K6* arch's
75 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
76 return 0
77} 82}
78 83
84# Remove occurrences of strings from variable given in $1
85# Strings removed are matched as globs, so for example
86# '-O*' would remove -O1, -O2 etc.
87_filter-var() {
88 local f x var=$1 new=()
89 shift
90
91 for f in ${!var} ; do
92 for x in "$@" ; do
93 # Note this should work with globs like -O*
94 [[ ${f} == ${x} ]] && continue 2
95 done
96 new+=( "${f}" )
97 done
98 eval export ${var}=\""${new[*]}"\"
99}
100
101# @FUNCTION: filter-flags
102# @USAGE: <flags>
103# @DESCRIPTION:
104# Remove particular <flags> from {C,CPP,CXX,F,FC,LD}FLAGS. Accepts shell globs.
79filter-flags() { 105filter-flags() {
80 for x in "$@" ; do 106 _filter-hardened "$@"
81 case "${x}" in 107 local v
82 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;; 108 for v in $(all-flag-vars) ; do
83 -fstack-protector|-fstack-protector-all) fstack-flags;; 109 _filter-var ${v} "$@"
84 *) ;;
85 esac
86 done 110 done
87
88 # we do this fancy spacing stuff so as to not filter
89 # out part of a flag ... we want flag atoms ! :D
90 CFLAGS=" ${CFLAGS} "
91 CXXFLAGS=" ${CXXFLAGS} "
92 for x in "$@" ; do
93 CFLAGS="${CFLAGS// ${x} / }"
94 CXXFLAGS="${CXXFLAGS// ${x} / }"
95 done
96 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
97 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
98 return 0 111 return 0
99} 112}
100 113
114# @FUNCTION: filter-lfs-flags
115# @DESCRIPTION:
116# Remove flags that enable Large File Support.
101filter-lfs-flags() { 117filter-lfs-flags() {
118 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
119 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
120 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
121 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
122 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
102 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE 123 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
103} 124}
104 125
126# @FUNCTION: append-cppflags
127# @USAGE: <flags>
128# @DESCRIPTION:
129# Add extra <flags> to the current CPPFLAGS.
130append-cppflags() {
131 [[ $# -eq 0 ]] && return 0
132 export CPPFLAGS="${CPPFLAGS} $*"
133 return 0
134}
135
136# @FUNCTION: append-cflags
137# @USAGE: <flags>
138# @DESCRIPTION:
139# Add extra <flags> to the current CFLAGS.
140append-cflags() {
141 [[ $# -eq 0 ]] && return 0
142 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
143 return 0
144}
145
146# @FUNCTION: append-cxxflags
147# @USAGE: <flags>
148# @DESCRIPTION:
149# Add extra <flags> to the current CXXFLAGS.
150append-cxxflags() {
151 [[ $# -eq 0 ]] && return 0
152 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
153 return 0
154}
155
156# @FUNCTION: append-fflags
157# @USAGE: <flags>
158# @DESCRIPTION:
159# Add extra <flags> to the current {F,FC}FLAGS.
160append-fflags() {
161 [[ $# -eq 0 ]] && return 0
162 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
163 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
164 return 0
165}
166
167# @FUNCTION: append-lfs-flags
168# @DESCRIPTION:
169# Add flags that enable Large File Support.
170append-lfs-flags() {
171 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
172 # see comments in filter-lfs-flags func for meaning of these
173 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
174}
175
176# @FUNCTION: append-flags
177# @USAGE: <flags>
178# @DESCRIPTION:
179# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
105append-flags() { 180append-flags() {
106 export CFLAGS="${CFLAGS} $@" 181 [[ $# -eq 0 ]] && return 0
107 export CXXFLAGS="${CXXFLAGS} $@" 182 append-cflags "$@"
108 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags 183 append-cxxflags "$@"
184 append-fflags "$@"
109 return 0 185 return 0
110} 186}
111 187
188# @FUNCTION: replace-flags
189# @USAGE: <old> <new>
190# @DESCRIPTION:
191# Replace the <old> flag with <new>. Accepts shell globs for <old>.
112replace-flags() { 192replace-flags() {
113 # we do this fancy spacing stuff so as to not filter 193 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
114 # out part of a flag ... we want flag atoms ! :D
115 CFLAGS=" ${CFLAGS} "
116 CXXFLAGS=" ${CXXFLAGS} "
117 CFLAGS="${CFLAGS// ${1} / ${2} }"
118 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
119 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
120 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
121 return 0
122}
123 194
195 local f var new
196 for var in $(all-flag-vars) ; do
197 # Looping over the flags instead of using a global
198 # substitution ensures that we're working with flag atoms.
199 # Otherwise globs like -O* have the potential to wipe out the
200 # list of flags.
201 new=()
202 for f in ${!var} ; do
203 # Note this should work with globs like -O*
204 [[ ${f} == ${1} ]] && f=${2}
205 new+=( "${f}" )
206 done
207 eval export ${var}=\""${new[*]}"\"
208 done
209
210 return 0
211}
212
213# @FUNCTION: replace-cpu-flags
214# @USAGE: <old> <new>
215# @DESCRIPTION:
216# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
217# with flags that select the <new> cpu. Accepts shell globs for <old>.
124replace-cpu-flags() { 218replace-cpu-flags() {
125 local newcpu="$1" ; shift 219 local newcpu="$#" ; newcpu="${!newcpu}"
126 local oldcpu="" 220 while [ $# -gt 1 ] ; do
127 for oldcpu in "$@" ; do 221 # quote to make sure that no globbing is done (particularly on
222 # ${oldcpu}) prior to calling replace-flags
128 replace-flags -march=${oldcpu} -march=${newcpu} 223 replace-flags "-march=${1}" "-march=${newcpu}"
129 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu} 224 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
130 replace-flags -mtune=${oldcpu} -mtune=${newcpu} 225 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
226 shift
131 done 227 done
228 return 0
229}
230
231_is_flagq() {
232 local x
233 for x in ${!1} ; do
234 [[ ${x} == $2 ]] && return 0
235 done
132 return 0 236 return 1
133} 237}
134 238
239# @FUNCTION: is-flagq
240# @USAGE: <flag>
241# @DESCRIPTION:
242# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
243is-flagq() {
244 [[ -n $2 ]] && die "Usage: is-flag <flag>"
245
246 local var
247 for var in $(all-flag-vars) ; do
248 _is_flagq ${var} "$1" && return 0
249 done
250 return 1
251}
252
253# @FUNCTION: is-flag
254# @USAGE: <flag>
255# @DESCRIPTION:
256# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
135is-flag() { 257is-flag() {
136 for x in ${CFLAGS} ${CXXFLAGS} ; do 258 is-flagq "$@" && echo true
137 if [ "${x}" == "$1" ] ; then
138 echo true
139 return 0
140 fi
141 done
142 return 1
143} 259}
144 260
261# @FUNCTION: is-ldflagq
262# @USAGE: <flag>
263# @DESCRIPTION:
264# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
265is-ldflagq() {
266 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
267 _is_flagq LDFLAGS $1
268}
269
270# @FUNCTION: is-ldflag
271# @USAGE: <flag>
272# @DESCRIPTION:
273# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
274is-ldflag() {
275 is-ldflagq "$@" && echo true
276}
277
278# @FUNCTION: filter-mfpmath
279# @USAGE: <math types>
280# @DESCRIPTION:
281# Remove specified math types from the fpmath flag. For example, if the user
282# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
283# -mfpmath=386.
145filter-mfpmath() { 284filter-mfpmath() {
285 local orig_mfpmath new_math prune_math
286
146 # save the original -mfpmath flag 287 # save the original -mfpmath flag
147 local orig_mfpmath="`get-flag -mfpmath`" 288 orig_mfpmath=$(get-flag -mfpmath)
148 # get the value of the current -mfpmath flag 289 # get the value of the current -mfpmath flag
149 local new_math=" `get-flag mfpmath | tr , ' '` " 290 new_math=$(get-flag mfpmath)
291 new_math=" ${new_math//,/ } "
150 # figure out which math values are to be removed 292 # figure out which math values are to be removed
151 local prune_math="" 293 prune_math=""
152 for prune_math in "$@" ; do 294 for prune_math in "$@" ; do
153 new_math="${new_math/ ${prune_math} / }" 295 new_math=${new_math/ ${prune_math} / }
154 done 296 done
155 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" 297 new_math=$(echo ${new_math})
298 new_math=${new_math// /,}
156 299
157 if [ -z "${new_math}" ] ; then 300 if [[ -z ${new_math} ]] ; then
158 # if we're removing all user specified math values are 301 # if we're removing all user specified math values are
159 # slated for removal, then we just filter the flag 302 # slated for removal, then we just filter the flag
160 filter-flags ${orig_mfpmath} 303 filter-flags ${orig_mfpmath}
161 else 304 else
162 # if we only want to filter some of the user specified 305 # if we only want to filter some of the user specified
164 replace-flags ${orig_mfpmath} -mfpmath=${new_math} 307 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
165 fi 308 fi
166 return 0 309 return 0
167} 310}
168 311
312# @FUNCTION: strip-flags
313# @DESCRIPTION:
314# Strip C[XX]FLAGS of everything except known good/safe flags.
169strip-flags() { 315strip-flags() {
316 local x y var
317
170 setup-allowed-flags 318 setup-allowed-flags
171 319
172 local NEW_CFLAGS="" 320 set -f # disable pathname expansion
173 local NEW_CXXFLAGS=""
174 321
175 # Allow unstable C[XX]FLAGS if we are using unstable profile ... 322 for var in $(all-flag-vars) ; do
176 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then 323 local new=()
177 [ `use debug` ] && einfo "Enabling the use of some unstable flags" 324
178 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" 325 for x in ${!var} ; do
326 local flag=${x%%=*}
327 for y in ${ALLOWED_FLAGS} ; do
328 if [[ -z ${flag%%${y}} ]] ; then
329 new+=( "${x}" )
330 break
331 fi
332 done
333 done
334
335 # In case we filtered out all optimization flags fallback to -O2
336 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
337 new+=( -O2 )
338 fi
339
340 eval export ${var}=\""${new[*]}"\"
341 done
342
343 set +f # re-enable pathname expansion
344
345 return 0
346}
347
348test-flag-PROG() {
349 local comp=$1
350 local flags="$2"
351
352 [[ -z ${comp} || -z ${flags} ]] && return 1
353
354 # use -c so we can test the assembler as well
355 local PROG=$(tc-get${comp})
356 ${PROG} ${flags} -c -o /dev/null -xc /dev/null \
357 > /dev/null 2>&1
358}
359
360# @FUNCTION: test-flag-CC
361# @USAGE: <flag>
362# @DESCRIPTION:
363# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
364test-flag-CC() { test-flag-PROG "CC" "$1"; }
365
366# @FUNCTION: test-flag-CXX
367# @USAGE: <flag>
368# @DESCRIPTION:
369# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
370test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
371
372# @FUNCTION: test-flag-F77
373# @USAGE: <flag>
374# @DESCRIPTION:
375# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
376test-flag-F77() { test-flag-PROG "F77" "$1"; }
377
378# @FUNCTION: test-flag-FC
379# @USAGE: <flag>
380# @DESCRIPTION:
381# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
382test-flag-FC() { test-flag-PROG "FC" "$1"; }
383
384test-flags-PROG() {
385 local comp=$1
386 local flags
387 local x
388
389 shift
390
391 [[ -z ${comp} ]] && return 1
392
393 for x in "$@" ; do
394 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
395 done
396
397 echo "${flags}"
398
399 # Just bail if we dont have any flags
400 [[ -n ${flags} ]]
401}
402
403# @FUNCTION: test-flags-CC
404# @USAGE: <flags>
405# @DESCRIPTION:
406# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
407test-flags-CC() { test-flags-PROG "CC" "$@"; }
408
409# @FUNCTION: test-flags-CXX
410# @USAGE: <flags>
411# @DESCRIPTION:
412# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
413test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
414
415# @FUNCTION: test-flags-F77
416# @USAGE: <flags>
417# @DESCRIPTION:
418# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
419test-flags-F77() { test-flags-PROG "F77" "$@"; }
420
421# @FUNCTION: test-flags-FC
422# @USAGE: <flags>
423# @DESCRIPTION:
424# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
425test-flags-FC() { test-flags-PROG "FC" "$@"; }
426
427# @FUNCTION: test-flags
428# @USAGE: <flags>
429# @DESCRIPTION:
430# Short-hand that should hopefully work for both C and C++ compiler, but
431# its really only present due to the append-flags() abomination.
432test-flags() { test-flags-CC "$@"; }
433
434# @FUNCTION: test_version_info
435# @USAGE: <version>
436# @DESCRIPTION:
437# Returns shell true if the current C compiler version matches <version>, else returns shell false.
438# Accepts shell globs.
439test_version_info() {
440 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
441 return 0
442 else
443 return 1
179 fi 444 fi
180
181 set -f
182
183 for x in ${CFLAGS}
184 do
185 for y in ${ALLOWED_FLAGS}
186 do
187 flag=${x%%=*}
188 if [ "${flag%%${y}}" = "" ]
189 then
190 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
191 break
192 fi
193 done
194 done
195
196 for x in ${CXXFLAGS}
197 do
198 for y in ${ALLOWED_FLAGS}
199 do
200 flag=${x%%=*}
201 if [ "${flag%%${y}}" = "" ]
202 then
203 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
204 break
205 fi
206 done
207 done
208
209 # In case we filtered out all optimization flags fallback to -O2
210 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
211 NEW_CFLAGS="${NEW_CFLAGS} -O2"
212 fi
213 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
214 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
215 fi
216
217 set +f
218
219 [ `use debug` ] \
220 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
221 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
222
223 export CFLAGS="${NEW_CFLAGS}"
224 export CXXFLAGS="${NEW_CXXFLAGS}"
225 return 0
226} 445}
227 446
228test_flag() { 447# @FUNCTION: strip-unsupported-flags
229 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then 448# @DESCRIPTION:
230 echo "$@" 449# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
231 return 0
232 fi
233 return 1
234}
235
236strip-unsupported-flags() { 450strip-unsupported-flags() {
237 for x in ${CFLAGS} ; do 451 export CFLAGS=$(test-flags-CC ${CFLAGS})
238 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`" 452 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
239 done 453 export FFLAGS=$(test-flags-F77 ${FFLAGS})
240 for x in ${CXXFLAGS} ; do 454 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
241 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
242 done
243
244 export CFLAGS="${NEW_CFLAGS}"
245 export CXXFLAGS="${NEW_CXXFLAGS}"
246} 455}
247 456
457# @FUNCTION: get-flag
458# @USAGE: <flag>
459# @DESCRIPTION:
460# Find and echo the value for a particular flag. Accepts shell globs.
248get-flag() { 461get-flag() {
462 local f var findflag="$1"
463
249 # this code looks a little flaky but seems to work for 464 # this code looks a little flaky but seems to work for
250 # everything we want ... 465 # everything we want ...
251 # for example, if CFLAGS="-march=i686": 466 # for example, if CFLAGS="-march=i686":
252 # `get-flags -march` == "-march=i686" 467 # `get-flag -march` == "-march=i686"
253 # `get-flags march` == "i686" 468 # `get-flag march` == "i686"
254 local findflag="$1" 469 for var in $(all-flag-vars) ; do
255 for f in ${CFLAGS} ${CXXFLAGS} ; do 470 for f in ${!var} ; do
256 if [ "${f/${findflag}}" != "${f}" ] ; then 471 if [ "${f/${findflag}}" != "${f}" ] ; then
257 echo "${f/-${findflag}=}" 472 printf "%s\n" "${f/-${findflag}=}"
258 return 0 473 return 0
259 fi 474 fi
475 done
260 done 476 done
261 return 1 477 return 1
262} 478}
263 479
480# @FUNCTION: has_m64
481# @DESCRIPTION:
482# This doesn't test if the flag is accepted, it tests if the flag actually
483# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
484# return code is 0, else the return code is 1.
485has_m64() {
486 eqawarn "${FUNCNAME}: don't use this anymore"
487
488 # 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!
490 # please dont replace this function with test_flag in some future
491 # clean-up!
492
493 local temp="$(emktemp)"
494 echo "int main() { return(0); }" > "${temp}".c
495 MY_CC=$(tc-getCC)
496 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
497 local ret=$?
498 rm -f "${temp}".c
499 [[ ${ret} != 1 ]] && return 0
500 return 1
501}
502
503has_m32() {
504 die "${FUNCNAME}: don't use this anymore"
505}
506
507# @FUNCTION: replace-sparc64-flags
508# @DESCRIPTION:
509# Sets mcpu to v8 and uses the original value as mtune if none specified.
264replace-sparc64-flags() { 510replace-sparc64-flags() {
265 local SPARC64_CPUS="ultrasparc v9" 511 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
266 512
267 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ] 513 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
268 then
269 for x in ${SPARC64_CPUS} 514 for x in ${SPARC64_CPUS}; do
270 do
271 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" 515 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
272 done 516 done
273 else 517 else
274 for x in ${SPARC64_CPUS} 518 for x in ${SPARC64_CPUS}; do
275 do
276 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 519 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
277 done 520 done
278 fi 521 fi
279 522
280 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ] 523 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
281 then
282 for x in ${SPARC64_CPUS} 524 for x in ${SPARC64_CPUS}; do
283 do
284 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" 525 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
285 done 526 done
286 else 527 else
287 for x in ${SPARC64_CPUS} 528 for x in ${SPARC64_CPUS}; do
288 do
289 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 529 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
290 done 530 done
291 fi 531 fi
292}
293 532
533 export CFLAGS CXXFLAGS
534}
535
536# @FUNCTION: append-libs
537# @USAGE: <libs>
538# @DESCRIPTION:
539# Add extra <libs> to the current LIBS.
540append-libs() {
541 [[ $# -eq 0 ]] && return 0
542 local flag
543 for flag in "$@"; do
544 [[ ${flag} == -l* ]] && flag=${flag#-l}
545 export LIBS="${LIBS} -l${flag}"
546 done
547
548 return 0
549}
550
551# @FUNCTION: append-ldflags
552# @USAGE: <flags>
553# @DESCRIPTION:
554# Add extra <flags> to the current LDFLAGS.
294append-ldflags() { 555append-ldflags() {
556 [[ $# -eq 0 ]] && return 0
557 local flag
558 for flag in "$@"; do
559 [[ ${flag} == -l* ]] && \
560 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
561 done
562
295 LDFLAGS="${LDFLAGS} $@" 563 export LDFLAGS="${LDFLAGS} $*"
296 return 0 564 return 0
297} 565}
298 566
299etexec-flags() { 567# @FUNCTION: filter-ldflags
300 has_version sys-devel/hardened-gcc 568# @USAGE: <flags>
301 if [ $? == 0 ] ; then 569# @DESCRIPTION:
302 if [ "`is-flag -yet_exec`" != "true" ]; then 570# Remove particular <flags> from LDFLAGS. Accepts shell globs.
303 debug-print ">>> appending flags -yet_exec" 571filter-ldflags() {
304 append-flags -yet_exec 572 _filter-var LDFLAGS "$@"
305 append-ldflags -yet_exec 573 return 0
306 fi 574}
575
576# @FUNCTION: raw-ldflags
577# @USAGE: [flags]
578# @DESCRIPTION:
579# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
580# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
581# to gcc where it needs the '-Wl,'.
582#
583# If no flags are specified, then default to ${LDFLAGS}.
584raw-ldflags() {
585 local x input="$@"
586 [[ -z ${input} ]] && input=${LDFLAGS}
587 set --
588 for x in ${input} ; do
589 x=${x#-Wl,}
590 set -- "$@" ${x//,/ }
591 done
592 echo "$@"
593}
594
595# @FUNCTION: no-as-needed
596# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
597no-as-needed() {
598 case $($(tc-getLD) -v 2>&1 </dev/null) in
599 *GNU*) # GNU ld
600 echo "-Wl,--no-as-needed" ;;
601 esac
602}
603
307 fi 604fi
308}
309
310fstack-flags() {
311 has_version sys-devel/hardened-gcc
312 if [ $? == 0 ] ; then
313 if [ "`is-flag -yno_propolice`" != "true" ]; then
314 debug-print ">>> appending flags -yno_propolice"
315 append-flags -yno_propolice
316 append-ldflags -yno_propolice
317 fi
318 fi
319}

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