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1# Copyright 1999-2003 Gentoo Technologies, Inc. 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 1.37 2004/02/21 07:19:29 vapier Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.174 2012/06/05 02:07:44 dirtyepic 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,CCAS,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 -mfloat-abi=* \
49 -D* -U*"
50
51 # 4.5
52 ALLOWED_FLAGS+=" -mno-fma4 -mno-movbe -mno-xop -mno-lwp"
53 # 4.6
54 ALLOWED_FLAGS+=" -mno-fsgsbase -mno-rdrnd -mno-f16c -mno-bmi -mno-tbm"
55
56 export ALLOWED_FLAGS
57 return 0
58}
59
60# inverted filters for hardened compiler. This is trying to unpick
61# the hardened compiler defaults.
62_filter-hardened() {
63 local f
64 for f in "$@" ; do
66 case "${ARCH}" in 65 case "${f}" in
67 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;; 66 # Ideally we should only concern ourselves with PIE flags,
68 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 67 # not -fPIC or -fpic, but too many places filter -fPIC without
69 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 68 # thinking about -fPIE.
70 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 69 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
70 gcc-specs-pie || continue
71 is-flagq -nopie || append-flags -nopie;;
72 -fstack-protector)
73 gcc-specs-ssp || continue
74 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
75 -fstack-protector-all)
76 gcc-specs-ssp-to-all || continue
77 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
78 -fno-strict-overflow)
79 gcc-specs-nostrict || continue
80 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
81 esac
82 done
83}
84
85# Remove occurrences of strings from variable given in $1
86# Strings removed are matched as globs, so for example
87# '-O*' would remove -O1, -O2 etc.
88_filter-var() {
89 local f x var=$1 new=()
90 shift
91
92 for f in ${!var} ; do
93 for x in "$@" ; do
94 # Note this should work with globs like -O*
95 [[ ${f} == ${x} ]] && continue 2
96 done
97 new+=( "${f}" )
98 done
99 eval export ${var}=\""${new[*]}"\"
100}
101
102# @FUNCTION: filter-flags
103# @USAGE: <flags>
104# @DESCRIPTION:
105# Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
106filter-flags() {
107 _filter-hardened "$@"
108 local v
109 for v in $(all-flag-vars) ; do
110 _filter-var ${v} "$@"
111 done
112 return 0
113}
114
115# @FUNCTION: filter-lfs-flags
116# @DESCRIPTION:
117# Remove flags that enable Large File Support.
118filter-lfs-flags() {
119 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
120 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
121 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
122 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
123 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
124 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
125}
126
127# @FUNCTION: filter-ldflags
128# @USAGE: <flags>
129# @DESCRIPTION:
130# Remove particular <flags> from LDFLAGS. Accepts shell globs.
131filter-ldflags() {
132 _filter-var LDFLAGS "$@"
133 return 0
134}
135
136# @FUNCTION: append-cppflags
137# @USAGE: <flags>
138# @DESCRIPTION:
139# Add extra <flags> to the current CPPFLAGS.
140append-cppflags() {
141 [[ $# -eq 0 ]] && return 0
142 export CPPFLAGS="${CPPFLAGS} $*"
143 return 0
144}
145
146# @FUNCTION: append-cflags
147# @USAGE: <flags>
148# @DESCRIPTION:
149# Add extra <flags> to the current CFLAGS.
150append-cflags() {
151 [[ $# -eq 0 ]] && return 0
152 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
153 return 0
154}
155
156# @FUNCTION: append-cxxflags
157# @USAGE: <flags>
158# @DESCRIPTION:
159# Add extra <flags> to the current CXXFLAGS.
160append-cxxflags() {
161 [[ $# -eq 0 ]] && return 0
162 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
163 return 0
164}
165
166# @FUNCTION: append-fflags
167# @USAGE: <flags>
168# @DESCRIPTION:
169# Add extra <flags> to the current {F,FC}FLAGS.
170append-fflags() {
171 [[ $# -eq 0 ]] && return 0
172 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
173 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
174 return 0
175}
176
177# @FUNCTION: append-lfs-flags
178# @DESCRIPTION:
179# Add flags that enable Large File Support.
180append-lfs-flags() {
181 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
182 # see comments in filter-lfs-flags func for meaning of these
183 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
184}
185
186# @FUNCTION: append-ldflags
187# @USAGE: <flags>
188# @DESCRIPTION:
189# Add extra <flags> to the current LDFLAGS.
190append-ldflags() {
191 [[ $# -eq 0 ]] && return 0
192 local flag
193 for flag in "$@"; do
194 [[ ${flag} == -l* ]] && \
195 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
196 done
197
198 export LDFLAGS="${LDFLAGS} $*"
199 return 0
200}
201
202# @FUNCTION: append-flags
203# @USAGE: <flags>
204# @DESCRIPTION:
205# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
206append-flags() {
207 [[ $# -eq 0 ]] && return 0
208 case " $* " in
209 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
210 *' '-L*|\
211 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
71 esac 212 esac
72 213 append-cflags "$@"
73 # C[XX]FLAGS that we are think is ok, but needs testing 214 append-cxxflags "$@"
74 # NOTE: currently -Os have issues with gcc3 and K6* arch's 215 append-fflags "$@"
75 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
76 return 0 216 return 0
77} 217}
78 218
79filter-flags() { 219# @FUNCTION: replace-flags
80 for x in "$@" ; do 220# @USAGE: <old> <new>
81 case "${x}" in 221# @DESCRIPTION:
82 -fPIC|-fpic|-fPIE|-fpie) etexec-flags;; 222# Replace the <old> flag with <new>. Accepts shell globs for <old>.
83 -fstack-protector|-fstack-protector-all) fstack-flags;;
84 *) ;;
85 esac
86 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:${#CXXFLAGS}-2}"
98 return 0
99}
100
101append-flags() {
102 export CFLAGS="${CFLAGS} $@"
103 export CXXFLAGS="${CXXFLAGS} $@"
104 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
105 return 0
106}
107
108replace-flags() { 223replace-flags() {
109 # we do this fancy spacing stuff so as to not filter 224 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
110 # out part of a flag ... we want flag atoms ! :D
111 CFLAGS=" ${CFLAGS} "
112 CXXFLAGS=" ${CXXFLAGS} "
113 CFLAGS="${CFLAGS// ${1} / ${2} }"
114 CXXFLAGS="${CXXFLAGS// ${1} / ${2} }"
115 CFLAGS="${CFLAGS:1:${#CFLAGS}-2}"
116 CXXFLAGS="${CXXFLAGS:1:${#CXXFLAGS}-2}"
117 return 0
118}
119 225
226 local f var new
227 for var in $(all-flag-vars) ; do
228 # Looping over the flags instead of using a global
229 # substitution ensures that we're working with flag atoms.
230 # Otherwise globs like -O* have the potential to wipe out the
231 # list of flags.
232 new=()
233 for f in ${!var} ; do
234 # Note this should work with globs like -O*
235 [[ ${f} == ${1} ]] && f=${2}
236 new+=( "${f}" )
237 done
238 eval export ${var}=\""${new[*]}"\"
239 done
240
241 return 0
242}
243
244# @FUNCTION: replace-cpu-flags
245# @USAGE: <old> <new>
246# @DESCRIPTION:
247# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
248# with flags that select the <new> cpu. Accepts shell globs for <old>.
120replace-cpu-flags() { 249replace-cpu-flags() {
121 local newcpu="$1" ; shift 250 local newcpu="$#" ; newcpu="${!newcpu}"
122 local oldcpu="" 251 while [ $# -gt 1 ] ; do
123 for oldcpu in "$@" ; do 252 # quote to make sure that no globbing is done (particularly on
253 # ${oldcpu}) prior to calling replace-flags
124 replace-flags -march=${oldcpu} -march=${newcpu} 254 replace-flags "-march=${1}" "-march=${newcpu}"
125 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu} 255 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
256 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
257 shift
126 done 258 done
259 return 0
260}
261
262_is_flagq() {
263 local x
264 for x in ${!1} ; do
265 [[ ${x} == $2 ]] && return 0
266 done
127 return 0 267 return 1
128} 268}
129 269
270# @FUNCTION: is-flagq
271# @USAGE: <flag>
272# @DESCRIPTION:
273# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
274is-flagq() {
275 [[ -n $2 ]] && die "Usage: is-flag <flag>"
276
277 local var
278 for var in $(all-flag-vars) ; do
279 _is_flagq ${var} "$1" && return 0
280 done
281 return 1
282}
283
284# @FUNCTION: is-flag
285# @USAGE: <flag>
286# @DESCRIPTION:
287# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
130is-flag() { 288is-flag() {
131 for x in ${CFLAGS} ${CXXFLAGS} ; do 289 is-flagq "$@" && echo true
132 if [ "${x}" == "$1" ] ; then
133 echo true
134 return 0
135 fi
136 done
137 return 1
138} 290}
139 291
292# @FUNCTION: is-ldflagq
293# @USAGE: <flag>
294# @DESCRIPTION:
295# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
296is-ldflagq() {
297 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
298 _is_flagq LDFLAGS $1
299}
300
301# @FUNCTION: is-ldflag
302# @USAGE: <flag>
303# @DESCRIPTION:
304# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
305is-ldflag() {
306 is-ldflagq "$@" && echo true
307}
308
309# @FUNCTION: filter-mfpmath
310# @USAGE: <math types>
311# @DESCRIPTION:
312# Remove specified math types from the fpmath flag. For example, if the user
313# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
314# -mfpmath=386.
140filter-mfpmath() { 315filter-mfpmath() {
316 local orig_mfpmath new_math prune_math
317
141 # save the original -mfpmath flag 318 # save the original -mfpmath flag
142 local orig_mfpmath="`get-flag -mfpmath`" 319 orig_mfpmath=$(get-flag -mfpmath)
143 # get the value of the current -mfpmath flag 320 # get the value of the current -mfpmath flag
144 local new_math=" `get-flag mfpmath | tr , ' '` " 321 new_math=$(get-flag mfpmath)
322 new_math=" ${new_math//,/ } "
145 # figure out which math values are to be removed 323 # figure out which math values are to be removed
146 local prune_math="" 324 prune_math=""
147 for prune_math in "$@" ; do 325 for prune_math in "$@" ; do
148 new_math="${new_math/ ${prune_math} / }" 326 new_math=${new_math/ ${prune_math} / }
149 done 327 done
150 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" 328 new_math=$(echo ${new_math})
329 new_math=${new_math// /,}
151 330
152 if [ -z "${new_math}" ] ; then 331 if [[ -z ${new_math} ]] ; then
153 # if we're removing all user specified math values are 332 # if we're removing all user specified math values are
154 # slated for removal, then we just filter the flag 333 # slated for removal, then we just filter the flag
155 filter-flags ${orig_mfpmath} 334 filter-flags ${orig_mfpmath}
156 else 335 else
157 # if we only want to filter some of the user specified 336 # if we only want to filter some of the user specified
159 replace-flags ${orig_mfpmath} -mfpmath=${new_math} 338 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
160 fi 339 fi
161 return 0 340 return 0
162} 341}
163 342
343# @FUNCTION: strip-flags
344# @DESCRIPTION:
345# Strip C[XX]FLAGS of everything except known good/safe flags.
164strip-flags() { 346strip-flags() {
347 local x y var
348
165 setup-allowed-flags 349 setup-allowed-flags
166 350
167 local NEW_CFLAGS="" 351 set -f # disable pathname expansion
168 local NEW_CXXFLAGS=""
169 352
170 # Allow unstable C[XX]FLAGS if we are using unstable profile ... 353 for var in $(all-flag-vars) ; do
171 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then 354 local new=()
172 [ `use debug` ] && einfo "Enabling the use of some unstable flags" 355
173 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" 356 for x in ${!var} ; do
357 local flag=${x%%=*}
358 for y in ${ALLOWED_FLAGS} ; do
359 if [[ -z ${flag%%${y}} ]] ; then
360 new+=( "${x}" )
361 break
362 fi
363 done
364 done
365
366 # In case we filtered out all optimization flags fallback to -O2
367 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
368 new+=( -O2 )
369 fi
370
371 eval export ${var}=\""${new[*]}"\"
372 done
373
374 set +f # re-enable pathname expansion
375
376 return 0
377}
378
379test-flag-PROG() {
380 local comp=$1
381 local flag=$2
382
383 [[ -z ${comp} || -z ${flag} ]] && return 1
384
385 # use -c so we can test the assembler as well
386 local PROG=$(tc-get${comp})
387 ${PROG} "${flag}" -c -o /dev/null -xc /dev/null \
388 > /dev/null 2>&1
389}
390
391# @FUNCTION: test-flag-CC
392# @USAGE: <flag>
393# @DESCRIPTION:
394# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
395test-flag-CC() { test-flag-PROG "CC" "$1"; }
396
397# @FUNCTION: test-flag-CXX
398# @USAGE: <flag>
399# @DESCRIPTION:
400# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
401test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
402
403# @FUNCTION: test-flag-F77
404# @USAGE: <flag>
405# @DESCRIPTION:
406# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
407test-flag-F77() { test-flag-PROG "F77" "$1"; }
408
409# @FUNCTION: test-flag-FC
410# @USAGE: <flag>
411# @DESCRIPTION:
412# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
413test-flag-FC() { test-flag-PROG "FC" "$1"; }
414
415test-flags-PROG() {
416 local comp=$1
417 local flags
418 local x
419
420 shift
421
422 [[ -z ${comp} ]] && return 1
423
424 for x in "$@" ; do
425 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
426 done
427
428 echo "${flags}"
429
430 # Just bail if we dont have any flags
431 [[ -n ${flags} ]]
432}
433
434# @FUNCTION: test-flags-CC
435# @USAGE: <flags>
436# @DESCRIPTION:
437# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
438test-flags-CC() { test-flags-PROG "CC" "$@"; }
439
440# @FUNCTION: test-flags-CXX
441# @USAGE: <flags>
442# @DESCRIPTION:
443# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
444test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
445
446# @FUNCTION: test-flags-F77
447# @USAGE: <flags>
448# @DESCRIPTION:
449# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
450test-flags-F77() { test-flags-PROG "F77" "$@"; }
451
452# @FUNCTION: test-flags-FC
453# @USAGE: <flags>
454# @DESCRIPTION:
455# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
456test-flags-FC() { test-flags-PROG "FC" "$@"; }
457
458# @FUNCTION: test-flags
459# @USAGE: <flags>
460# @DESCRIPTION:
461# Short-hand that should hopefully work for both C and C++ compiler, but
462# its really only present due to the append-flags() abomination.
463test-flags() { test-flags-CC "$@"; }
464
465# @FUNCTION: test_version_info
466# @USAGE: <version>
467# @DESCRIPTION:
468# Returns shell true if the current C compiler version matches <version>, else returns shell false.
469# Accepts shell globs.
470test_version_info() {
471 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
472 return 0
473 else
474 return 1
174 fi 475 fi
175
176 set -f
177
178 for x in ${CFLAGS}
179 do
180 for y in ${ALLOWED_FLAGS}
181 do
182 flag=${x%%=*}
183 if [ "${flag%%${y}}" = "" ]
184 then
185 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
186 break
187 fi
188 done
189 done
190
191 for x in ${CXXFLAGS}
192 do
193 for y in ${ALLOWED_FLAGS}
194 do
195 flag=${x%%=*}
196 if [ "${flag%%${y}}" = "" ]
197 then
198 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
199 break
200 fi
201 done
202 done
203
204 # In case we filtered out all optimization flags fallback to -O2
205 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
206 NEW_CFLAGS="${NEW_CFLAGS} -O2"
207 fi
208 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
209 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
210 fi
211
212 set +f
213
214 [ `use debug` ] \
215 && einfo "CFLAGS=\"${NEW_CFLAGS}\"" \
216 && einfo "CXXFLAGS=\"${NEW_CXXFLAGS}\""
217
218 export CFLAGS="${NEW_CFLAGS}"
219 export CXXFLAGS="${NEW_CXXFLAGS}"
220 return 0
221} 476}
222 477
223test_flag() { 478# @FUNCTION: strip-unsupported-flags
224 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then 479# @DESCRIPTION:
225 echo "$@" 480# Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
226 return 0
227 fi
228 return 1
229}
230
231strip-unsupported-flags() { 481strip-unsupported-flags() {
232 for x in ${CFLAGS} ; do 482 export CFLAGS=$(test-flags-CC ${CFLAGS})
233 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`" 483 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
234 done 484 export FFLAGS=$(test-flags-F77 ${FFLAGS})
235 for x in ${CXXFLAGS} ; do 485 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
236 NEW_CXXFLAGS=${NEW_CXXFLAGS}" ""`test_flag ${x}`"
237 done
238
239 export CFLAGS="${NEW_CFLAGS}"
240 export CXXFLAGS="${NEW_CXXFLAGS}"
241} 486}
242 487
488# @FUNCTION: get-flag
489# @USAGE: <flag>
490# @DESCRIPTION:
491# Find and echo the value for a particular flag. Accepts shell globs.
243get-flag() { 492get-flag() {
493 local f var findflag="$1"
494
244 # this code looks a little flaky but seems to work for 495 # this code looks a little flaky but seems to work for
245 # everything we want ... 496 # everything we want ...
246 # for example, if CFLAGS="-march=i686": 497 # for example, if CFLAGS="-march=i686":
247 # `get-flags -march` == "-march=i686" 498 # `get-flag -march` == "-march=i686"
248 # `get-flags march` == "i686" 499 # `get-flag march` == "i686"
249 local findflag="$1" 500 for var in $(all-flag-vars) ; do
250 for f in ${CFLAGS} ${CXXFLAGS} ; do 501 for f in ${!var} ; do
251 if [ "${f/${findflag}}" != "${f}" ] ; then 502 if [ "${f/${findflag}}" != "${f}" ] ; then
252 echo "${f/-${findflag}=}" 503 printf "%s\n" "${f/-${findflag}=}"
253 return 0 504 return 0
254 fi 505 fi
506 done
255 done 507 done
256 return 1 508 return 1
257} 509}
258 510
511# @FUNCTION: has_m64
512# @DESCRIPTION:
513# This doesn't test if the flag is accepted, it tests if the flag actually
514# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
515# return code is 0, else the return code is 1.
516has_m64() {
517 eqawarn "${FUNCNAME}: don't use this anymore"
518
519 # this doesnt test if the flag is accepted, it tests if the flag
520 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
521 # please dont replace this function with test_flag in some future
522 # clean-up!
523
524 local temp="$(emktemp)"
525 echo "int main() { return(0); }" > "${temp}".c
526 MY_CC=$(tc-getCC)
527 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
528 local ret=$?
529 rm -f "${temp}".c
530 [[ ${ret} != 1 ]] && return 0
531 return 1
532}
533
534has_m32() {
535 die "${FUNCNAME}: don't use this anymore"
536}
537
538# @FUNCTION: replace-sparc64-flags
539# @DESCRIPTION:
540# Sets mcpu to v8 and uses the original value as mtune if none specified.
259replace-sparc64-flags() { 541replace-sparc64-flags() {
260 local SPARC64_CPUS="ultrasparc v9" 542 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
261 543
262 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ] 544 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
263 then
264 for x in ${SPARC64_CPUS} 545 for x in ${SPARC64_CPUS}; do
265 do
266 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" 546 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
267 done 547 done
268 else 548 else
269 for x in ${SPARC64_CPUS} 549 for x in ${SPARC64_CPUS}; do
270 do
271 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 550 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
272 done 551 done
273 fi 552 fi
274 553
275 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ] 554 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
276 then
277 for x in ${SPARC64_CPUS} 555 for x in ${SPARC64_CPUS}; do
278 do
279 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" 556 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
280 done 557 done
281 else 558 else
282 for x in ${SPARC64_CPUS} 559 for x in ${SPARC64_CPUS}; do
283 do
284 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 560 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
285 done 561 done
286 fi 562 fi
287}
288 563
564 export CFLAGS CXXFLAGS
565}
566
567# @FUNCTION: append-libs
568# @USAGE: <libs>
569# @DESCRIPTION:
570# Add extra <libs> to the current LIBS.
289append-ldflags() { 571append-libs() {
290 LDFLAGS="${LDFLAGS} $@" 572 [[ $# -eq 0 ]] && return 0
291 return 0 573 local flag
292} 574 for flag in "$@"; do
575 [[ ${flag} == -l* ]] && flag=${flag#-l}
576 export LIBS="${LIBS} -l${flag}"
577 done
293 578
294etexec-flags() { 579 return 0
295 has_version sys-devel/hardened-gcc 580}
296 if [ $? == 0 ] ; then 581
297 if [ "`is-flag -yet_exec`" != "true" ]; then 582# @FUNCTION: raw-ldflags
298 debug-print ">>> appending flags -yet_exec" 583# @USAGE: [flags]
299 append-flags -yet_exec 584# @DESCRIPTION:
300 append-ldflags -yet_exec 585# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
301 fi 586# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
587# to gcc where it needs the '-Wl,'.
588#
589# If no flags are specified, then default to ${LDFLAGS}.
590raw-ldflags() {
591 local x input="$@"
592 [[ -z ${input} ]] && input=${LDFLAGS}
593 set --
594 for x in ${input} ; do
595 x=${x#-Wl,}
596 set -- "$@" ${x//,/ }
597 done
598 echo "$@"
599}
600
601# @FUNCTION: no-as-needed
602# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
603no-as-needed() {
604 case $($(tc-getLD) -v 2>&1 </dev/null) in
605 *GNU*) # GNU ld
606 echo "-Wl,--no-as-needed" ;;
607 esac
608}
609
302 fi 610fi
303}
304
305fstack-flags() {
306 has_version sys-devel/hardened-gcc
307 if [ $? == 0 ] ; then
308 if [ "`is-flag -yno_propolice`" != "true" ]; then
309 debug-print ">>> appending flags -yno_propolice"
310 append-flags -yno_propolice
311 append-ldflags -yno_propolice
312 fi
313 fi
314}

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