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Revision 1.3 Revision 1.114
1# Copyright 1999-2002 Gentoo Technologies, Inc. 1# Copyright 1999-2006 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# Author Bart Verwilst <verwilst@gentoo.org> 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.114 2006/12/27 00:52:12 vapier Exp $
4# /space/gentoo/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass
5ECLASS=flag-o-matic
6
7# 4#
5# Maintainer: base-system@gentoo.org
6
7# need access to emktemp()
8inherit eutils toolchain-funcs multilib
9
10#
8#### filter-flags <flag> #### 11#### filter-flags <flags> ####
9# Remove particular flags from C[XX]FLAGS 12# Remove particular flags from C[XX]FLAGS
13# Matches only complete flags
10# 14#
11#### append-flags <flag> #### 15#### append-flags <flags> ####
12# Add extra flags to your current C[XX]FLAGS 16# Add extra flags to your current C[XX]FLAGS
13# 17#
14#### change-flags <orig.flag> <new.flag> ### 18#### replace-flags <orig.flag> <new.flag> ###
15# Replace a flag by another one 19# Replace a flag by another one
16# 20#
21#### replace-cpu-flags <old.cpus> <new.cpu> ###
22# Replace march/mcpu flags that specify <old.cpus>
23# with flags that specify <new.cpu>
24#
25#### is-flag[q] <flag> ####
26# Returns "true" if flag is set in C[XX]FLAGS
27# Matches only complete a flag
28# q version sets return code but doesn't echo
29#
30#### is-ldflag[q] <flag> ####
31# Returns "true" if flag is set in LDFLAGS
32# Matches only complete a flag
33# q version sets return code but doesn't echo
34#
35#### strip-flags ####
36# Strip C[XX]FLAGS of everything except known
37# good options.
38#
39#### strip-unsupported-flags ####
40# Strip C[XX]FLAGS of any flags not supported by
41# installed version of gcc
42#
43#### get-flag <flag> ####
44# Find and echo the value for a particular flag
45#
46#### replace-sparc64-flags ####
47# Sets mcpu to v8 and uses the original value
48# as mtune if none specified.
49#
50#### filter-mfpmath <math types> ####
51# Remove specified math types from the fpmath specification
52# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
53# will leave the user with -mfpmath=386
54#
55#### append-ldflags ####
56# Add extra flags to your current LDFLAGS
57#
58#### filter-ldflags <flags> ####
59# Remove particular flags from LDFLAGS
60# Matches only complete flags
61#
62#### bindnow-flags ####
63# Returns the flags to enable "now" binding in the current selected linker.
64#
65################ DEPRECATED functions ################
66# The following are still present to avoid breaking existing
67# code more than necessary; however they are deprecated. Please
68# use gcc-specs-* from toolchain-funcs.eclass instead, if you
69# need to know which hardened techs are active in the compiler.
70# See bug #100974
71#
72#### has_hardened ####
73# Returns true if the compiler has 'Hardened' in its version string,
74# (note; switched-spec vanilla compilers satisfy this condition) or
75# the specs file name contains 'hardened'.
76#
77#### has_pie ####
78# Returns true if the compiler by default or with current CFLAGS
79# builds position-independent code.
80#
81#### has_pic ####
82# Returns true if the compiler by default or with current CFLAGS
83# builds position-independent code.
84#
85#### has_ssp_all ####
86# Returns true if the compiler by default or with current CFLAGS
87# generates stack smash protections for all functions
88#
89#### has_ssp ####
90# Returns true if the compiler by default or with current CFLAGS
91# generates stack smash protections for most vulnerable functions
92#
17 93
94# C[XX]FLAGS that we allow in strip-flags
95setup-allowed-flags() {
96 if [[ -z ${ALLOWED_FLAGS} ]] ; then
97 export ALLOWED_FLAGS="-pipe"
98 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
99 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
100 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
101 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
102 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
103 export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident"
104 fi
105 # allow a bunch of flags that negate features / control ABI
106 ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
107 ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
108 -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
109 -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
110 -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
111 -mieee -mieee-with-inexact -mschedule \
112 -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
113 -mflat -mno-flat -mno-faster-structs -mfaster-structs \
114 -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
115 -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias \
116 -msecure-plt"
18 117
118 # C[XX]FLAGS that we are think is ok, but needs testing
119 # NOTE: currently -Os have issues with gcc3 and K6* arch's
120 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
121 return 0
122}
123
124# inverted filters for hardened compiler. This is trying to unpick
125# the hardened compiler defaults.
126_filter-hardened() {
127 local f
128 for f in "$@" ; do
129 case "${f}" in
130 # Ideally we should only concern ourselves with PIE flags,
131 # not -fPIC or -fpic, but too many places filter -fPIC without
132 # thinking about -fPIE.
133 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
134 gcc-specs-pie || continue
135 is-flagq -nopie || append-flags -nopie;;
136 -fstack-protector)
137 gcc-specs-ssp || continue
138 is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
139 -fstack-protector-all)
140 gcc-specs-ssp-to-all || continue
141 is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
142 esac
143 done
144}
145
146# Remove occurrences of strings from variable given in $1
147# Strings removed are matched as globs, so for example
148# '-O*' would remove -O1, -O2 etc.
149_filter-var() {
150 local f x VAR VAL
151 declare -a new
152
153 VAR=$1
154 shift
155 eval VAL=\${${VAR}}
156 for f in ${VAL}; do
157 for x in "$@"; do
158 # Note this should work with globs like -O*
159 [[ ${f} == ${x} ]] && continue 2
160 done
161 eval new\[\${\#new\[@]}]=\${f}
162 done
163 eval export ${VAR}=\${new\[*]}
164}
165
19filter-flags () { 166filter-flags() {
20 167 _filter-hardened "$@"
21 for x in $1; do 168 _filter-var CFLAGS "$@"
22 CFLAGS="${CFLAGS/$x}" 169 _filter-var CXXFLAGS "$@"
23 CXXFLAGS="${CXXFLAGS/$x}" 170 return 0
24 done
25
26} 171}
27 172
173filter-lfs-flags() {
174 [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
175 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
176}
177
178append-lfs-flags() {
179 [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
180 append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
181}
182
28append-flags () { 183append-flags() {
29 184 [[ -z $* ]] && return 0
30
31 CFLAGS="$CFLAGS $1" 185 export CFLAGS="${CFLAGS} $*"
32 CXXFLAGS="$CXXFLAGS $1" 186 export CXXFLAGS="${CXXFLAGS} $*"
33 187 return 0
34} 188}
35 189
190replace-flags() {
191 [[ $# != 2 ]] \
192 && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
193 && die "replace-flags takes 2 arguments, not $#"
194
195 local f fset
196 declare -a new_CFLAGS new_CXXFLAGS
197
198 for fset in CFLAGS CXXFLAGS; do
199 # Looping over the flags instead of using a global
200 # substitution ensures that we're working with flag atoms.
201 # Otherwise globs like -O* have the potential to wipe out the
202 # list of flags.
203 for f in ${!fset}; do
204 # Note this should work with globs like -O*
205 [[ ${f} == ${1} ]] && f=${2}
206 eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
207 done
208 eval export ${fset}=\${new_${fset}\[*]}
209 done
210
211 return 0
212}
213
214replace-cpu-flags() {
215 local newcpu="$#" ; newcpu="${!newcpu}"
216 while [ $# -gt 1 ] ; do
217 # quote to make sure that no globbing is done (particularly on
218 # ${oldcpu}) prior to calling replace-flags
219 replace-flags "-march=${1}" "-march=${newcpu}"
220 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
221 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
222 shift
223 done
224 return 0
225}
226
227_is_flagq() {
228 local x
229 for x in ${!1} ; do
230 [[ ${x} == $2 ]] && return 0
231 done
232 return 1
233}
234
235is-flagq() {
236 [[ -n $2 ]] && die "Usage: is-flag <flag>"
237 _is_flagq CFLAGS $1 || _is_flagq CXXFLAGS $1
238}
239
240is-flag() {
241 is-flagq "$@" && echo true
242}
243
244is-ldflagq() {
245 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
246 _is_flagq LDFLAGS $1
247}
248
249is-ldflag() {
250 is-ldflagq "$@" && echo true
251}
252
253filter-mfpmath() {
254 local orig_mfpmath new_math prune_math
255
256 # save the original -mfpmath flag
257 orig_mfpmath=$(get-flag -mfpmath)
258 # get the value of the current -mfpmath flag
259 new_math=$(get-flag mfpmath)
260 new_math=" ${new_math//,/ } "
261 # figure out which math values are to be removed
262 prune_math=""
263 for prune_math in "$@" ; do
264 new_math=${new_math/ ${prune_math} / }
265 done
266 new_math=$(echo ${new_math})
267 new_math=${new_math// /,}
268
269 if [[ -z ${new_math} ]] ; then
270 # if we're removing all user specified math values are
271 # slated for removal, then we just filter the flag
272 filter-flags ${orig_mfpmath}
273 else
274 # if we only want to filter some of the user specified
275 # math values, then we replace the current flag
276 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
277 fi
278 return 0
279}
280
281strip-flags() {
282 local x y flag NEW_CFLAGS NEW_CXXFLAGS
283
284 setup-allowed-flags
285
286 local NEW_CFLAGS=""
287 local NEW_CXXFLAGS=""
288
289 # Allow unstable C[XX]FLAGS if we are using unstable profile ...
290 if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
291 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
292 fi
293
294 set -f # disable pathname expansion
295
296 for x in ${CFLAGS}; do
297 for y in ${ALLOWED_FLAGS}; do
298 flag=${x%%=*}
299 if [ "${flag%%${y}}" = "" ] ; then
300 NEW_CFLAGS="${NEW_CFLAGS} ${x}"
301 break
302 fi
303 done
304 done
305
306 for x in ${CXXFLAGS}; do
307 for y in ${ALLOWED_FLAGS}; do
308 flag=${x%%=*}
309 if [ "${flag%%${y}}" = "" ] ; then
310 NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
311 break
312 fi
313 done
314 done
315
316 # In case we filtered out all optimization flags fallback to -O2
317 if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
318 NEW_CFLAGS="${NEW_CFLAGS} -O2"
319 fi
320 if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
321 NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
322 fi
323
324 set +f # re-enable pathname expansion
325
326 export CFLAGS="${NEW_CFLAGS}"
327 export CXXFLAGS="${NEW_CXXFLAGS}"
328 return 0
329}
330
331test-flag-PROG() {
332 local comp=$1
333 local flags="$2"
334
335 [[ -z ${comp} || -z ${flags} ]] && \
336 return 1
337
338 local PROG=$(tc-get${comp})
339 ${PROG} ${flags} -S -o /dev/null -xc /dev/null \
340 > /dev/null 2>&1
341}
342
343# Returns true if C compiler support given flag
344test-flag-CC() { test-flag-PROG "CC" "$1"; }
345
346# Returns true if C++ compiler support given flag
347test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
348
349test-flags-PROG() {
350 local comp=$1
351 local flags
352 local x
353
354 shift
355
356 [[ -z ${comp} ]] && return 1
357
358 x=""
359 for x in "$@" ; do
360 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
361 done
362
363 echo "${flags}"
364
365 # Just bail if we dont have any flags
366 [[ -n ${flags} ]]
367}
368
369# Returns (echo's) the given flags supported by the C compiler
370test-flags-CC() { test-flags-PROG "CC" "$@"; }
371
372# Returns (echo's) the given flags supported by the C++ compiler
373test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
374
375# Short-hand that should hopefully work for both C and C++ compiler, but
376# its really only present due to the append-flags() abomination.
377test-flags() { test-flags-CC "$@"; }
378
379# Depriciated, use test-flags()
380test_flag() {
381 ewarn "test_flag: deprecated, please use test-flags()!" >&2
382
383 test-flags-CC "$@"
384}
385
386test_version_info() {
387 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
388 return 0
389 else
390 return 1
391 fi
392}
393
394strip-unsupported-flags() {
395 export CFLAGS=$(test-flags-CC ${CFLAGS})
396 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
397}
398
36change-flags () { 399get-flag() {
400 local f findflag="$1"
37 401
38 CFLAGS="${CFLAGS/${1}/${2}" 402 # this code looks a little flaky but seems to work for
39 CXXFLAGS="${CXXFLAGS/${1}/${2}" 403 # everything we want ...
40 404 # for example, if CFLAGS="-march=i686":
405 # `get-flag -march` == "-march=i686"
406 # `get-flag march` == "i686"
407 for f in ${CFLAGS} ${CXXFLAGS} ; do
408 if [ "${f/${findflag}}" != "${f}" ] ; then
409 printf "%s\n" "${f/-${findflag}=}"
410 return 0
411 fi
412 done
413 return 1
41} 414}
415
416# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
417has_hardened() {
418 ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2
419
420 test_version_info Hardened && return 0
421 # The specs file wont exist unless gcc has GCC_SPECS support
422 [[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
423}
424
425# DEPRECATED - use gcc-specs-pie from toolchain-funcs
426# indicate whether PIC is set
427has_pic() {
428 ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2
429
430 [[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
431 ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
432 gcc-specs-pie
433}
434
435# DEPRECATED - use gcc-specs-pie from toolchain-funcs
436# indicate whether PIE is set
437has_pie() {
438 ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2
439
440 [[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
441 ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
442 gcc-specs-pie
443}
444
445# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
446# indicate whether code for SSP is being generated for all functions
447has_ssp_all() {
448 ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2
449
450 # note; this matches only -fstack-protector-all
451 [[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
452 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
453 gcc-specs-ssp-all
454}
455
456# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
457# indicate whether code for SSP is being generated
458has_ssp() {
459 ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2
460
461 # note; this matches both -fstack-protector and -fstack-protector-all
462 [[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
463 -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
464 gcc-specs-ssp
465}
466
467has_m64() {
468 # this doesnt test if the flag is accepted, it tests if the flag
469 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
470 # please dont replace this function with test_flag in some future
471 # clean-up!
472
473 local temp="$(emktemp)"
474 echo "int main() { return(0); }" > "${temp}".c
475 MY_CC=$(tc-getCC)
476 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
477 local ret=$?
478 rm -f "${temp}".c
479 [[ ${ret} != 1 ]] && return 0
480 return 1
481}
482
483has_m32() {
484 # this doesnt test if the flag is accepted, it tests if the flag
485 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
486 # please dont replace this function with test_flag in some future
487 # clean-up!
488
489 [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
490
491 local temp=$(emktemp)
492 echo "int main() { return(0); }" > "${temp}".c
493 MY_CC=$(tc-getCC)
494 ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
495 local ret=$?
496 rm -f "${temp}".c
497 [[ ${ret} != 1 ]] && return 0
498 return 1
499}
500
501replace-sparc64-flags() {
502 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
503
504 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
505 for x in ${SPARC64_CPUS}; do
506 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
507 done
508 else
509 for x in ${SPARC64_CPUS}; do
510 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
511 done
512 fi
513
514 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
515 for x in ${SPARC64_CPUS}; do
516 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
517 done
518 else
519 for x in ${SPARC64_CPUS}; do
520 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
521 done
522 fi
523
524 export CFLAGS CXXFLAGS
525}
526
527append-ldflags() {
528 [[ -z $* ]] && return 0
529 export LDFLAGS="${LDFLAGS} $*"
530 return 0
531}
532
533# Remove flags from LDFLAGS - it's up to the ebuild to filter
534# CFLAGS and CXXFLAGS via filter-flags if they need to.
535filter-ldflags() {
536 _filter-var LDFLAGS "$@"
537 return 0
538}
539
540# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
541# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
542# to gcc where it needs the '-Wl,'.
543raw-ldflags() {
544 local x input="$@"
545 [[ -z ${input} ]] && input=${LDFLAGS}
546 set --
547 for x in ${input} ; do
548 x=${x#-Wl,}
549 set -- "$@" ${x//,/ }
550 done
551 echo "$@"
552}
553
554# Gets the flags needed for "NOW" binding
555bindnow-flags() {
556 case $($(tc-getLD) -v 2>&1 </dev/null) in
557 *GNU* | *'with BFD'*) # GNU ld
558 echo "-Wl,-z,now" ;;
559 *Apple*) # Darwin ld
560 echo "-bind_at_load" ;;
561 *)
562 # Some linkers just recognize -V instead of -v
563 case $($(tc-getLD) -V 2>&1 </dev/null) in
564 *Solaris*) # Solaris accept almost the same GNU options
565 echo "-Wl,-z,now" ;;
566 esac
567 ;;
568 esac
569}
570
571
572# Some tests for when we screw with things and want to make
573# sure we didn't break anything
574#TESTS() {
575# CFLAGS="-a -b -c=1"
576# CXXFLAGS="-x -y -z=2"
577# LDFLAGS="-l -m -n=3"
578#
579# die() { exit 1; }
580# (is-flag 1 2 3) && die
581# (is-ldflag 1 2 3) && die
582#
583# is-flagq -l && die
584# is-ldflagq -a && die
585# is-flagq -a || die
586# is-flagq -x || die
587# is-ldflagq -n=* || die
588# is-ldflagq -n && die
589#
590# strip-unsupported-flags
591# [[ ${CFLAGS} == "-c=1" ]] || die
592# [[ ${CXXFLAGS} == "-y -z=2" ]] || die
593#
594# echo "All tests pass"
595#}
596#TESTS

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