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Revision 1.175 - (show annotations) (download)
Tue Jun 5 02:16:40 2012 UTC (2 years, 1 month ago) by dirtyepic
Branch: MAIN
Changes since 1.174: +3 -1 lines
Update Intel/AMD instruction sets for 4.7.

1 # Copyright 1999-2012 Gentoo Foundation
2 # Distributed under the terms of the GNU General Public License v2
3 # $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.174 2012/06/05 02:07:44 dirtyepic 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
13 if [[ ${___ECLASS_ONCE_FLAG_O_MATIC} != "recur -_+^+_- spank" ]] ; then
14 ___ECLASS_ONCE_FLAG_O_MATIC="recur -_+^+_- spank"
15
16 inherit eutils toolchain-funcs multilib
17
18 # Return all the flag variables that our high level funcs operate on.
19 all-flag-vars() {
20 echo {C,CPP,CXX,CCAS,F,FC,LD}FLAGS
21 }
22
23 # {C,CXX,F,FC}FLAGS that we allow in strip-flags
24 # Note: shell globs and character lists are allowed
25 setup-allowed-flags() {
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 # 4.7
56 ALLOWED_FLAGS+=" -mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt"
57
58 export ALLOWED_FLAGS
59 return 0
60 }
61
62 # inverted filters for hardened compiler. This is trying to unpick
63 # the hardened compiler defaults.
64 _filter-hardened() {
65 local f
66 for f in "$@" ; do
67 case "${f}" in
68 # Ideally we should only concern ourselves with PIE flags,
69 # not -fPIC or -fpic, but too many places filter -fPIC without
70 # thinking about -fPIE.
71 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
72 gcc-specs-pie || continue
73 is-flagq -nopie || append-flags -nopie;;
74 -fstack-protector)
75 gcc-specs-ssp || continue
76 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
77 -fstack-protector-all)
78 gcc-specs-ssp-to-all || continue
79 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
80 -fno-strict-overflow)
81 gcc-specs-nostrict || continue
82 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
83 esac
84 done
85 }
86
87 # Remove occurrences of strings from variable given in $1
88 # Strings removed are matched as globs, so for example
89 # '-O*' would remove -O1, -O2 etc.
90 _filter-var() {
91 local f x var=$1 new=()
92 shift
93
94 for f in ${!var} ; do
95 for x in "$@" ; do
96 # Note this should work with globs like -O*
97 [[ ${f} == ${x} ]] && continue 2
98 done
99 new+=( "${f}" )
100 done
101 eval export ${var}=\""${new[*]}"\"
102 }
103
104 # @FUNCTION: filter-flags
105 # @USAGE: <flags>
106 # @DESCRIPTION:
107 # Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
108 filter-flags() {
109 _filter-hardened "$@"
110 local v
111 for v in $(all-flag-vars) ; do
112 _filter-var ${v} "$@"
113 done
114 return 0
115 }
116
117 # @FUNCTION: filter-lfs-flags
118 # @DESCRIPTION:
119 # Remove flags that enable Large File Support.
120 filter-lfs-flags() {
121 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
122 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
123 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
124 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
125 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
126 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
127 }
128
129 # @FUNCTION: filter-ldflags
130 # @USAGE: <flags>
131 # @DESCRIPTION:
132 # Remove particular <flags> from LDFLAGS. Accepts shell globs.
133 filter-ldflags() {
134 _filter-var LDFLAGS "$@"
135 return 0
136 }
137
138 # @FUNCTION: append-cppflags
139 # @USAGE: <flags>
140 # @DESCRIPTION:
141 # Add extra <flags> to the current CPPFLAGS.
142 append-cppflags() {
143 [[ $# -eq 0 ]] && return 0
144 export CPPFLAGS="${CPPFLAGS} $*"
145 return 0
146 }
147
148 # @FUNCTION: append-cflags
149 # @USAGE: <flags>
150 # @DESCRIPTION:
151 # Add extra <flags> to the current CFLAGS.
152 append-cflags() {
153 [[ $# -eq 0 ]] && return 0
154 export CFLAGS=$(test-flags-CC ${CFLAGS} "$@")
155 return 0
156 }
157
158 # @FUNCTION: append-cxxflags
159 # @USAGE: <flags>
160 # @DESCRIPTION:
161 # Add extra <flags> to the current CXXFLAGS.
162 append-cxxflags() {
163 [[ $# -eq 0 ]] && return 0
164 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS} "$@")
165 return 0
166 }
167
168 # @FUNCTION: append-fflags
169 # @USAGE: <flags>
170 # @DESCRIPTION:
171 # Add extra <flags> to the current {F,FC}FLAGS.
172 append-fflags() {
173 [[ $# -eq 0 ]] && return 0
174 export FFLAGS=$(test-flags-F77 ${FFLAGS} "$@")
175 export FCFLAGS=$(test-flags-FC ${FCFLAGS} "$@")
176 return 0
177 }
178
179 # @FUNCTION: append-lfs-flags
180 # @DESCRIPTION:
181 # Add flags that enable Large File Support.
182 append-lfs-flags() {
183 [[ $# -ne 0 ]] && die "append-lfs-flags takes no arguments"
184 # see comments in filter-lfs-flags func for meaning of these
185 append-cppflags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
186 }
187
188 # @FUNCTION: append-ldflags
189 # @USAGE: <flags>
190 # @DESCRIPTION:
191 # Add extra <flags> to the current LDFLAGS.
192 append-ldflags() {
193 [[ $# -eq 0 ]] && return 0
194 local flag
195 for flag in "$@"; do
196 [[ ${flag} == -l* ]] && \
197 ewarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
198 done
199
200 export LDFLAGS="${LDFLAGS} $*"
201 return 0
202 }
203
204 # @FUNCTION: append-flags
205 # @USAGE: <flags>
206 # @DESCRIPTION:
207 # Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
208 append-flags() {
209 [[ $# -eq 0 ]] && return 0
210 case " $* " in
211 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
212 *' '-L*|\
213 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
214 esac
215 append-cflags "$@"
216 append-cxxflags "$@"
217 append-fflags "$@"
218 return 0
219 }
220
221 # @FUNCTION: replace-flags
222 # @USAGE: <old> <new>
223 # @DESCRIPTION:
224 # Replace the <old> flag with <new>. Accepts shell globs for <old>.
225 replace-flags() {
226 [[ $# != 2 ]] && die "Usage: replace-flags <old flag> <new flag>"
227
228 local f var new
229 for var in $(all-flag-vars) ; do
230 # Looping over the flags instead of using a global
231 # substitution ensures that we're working with flag atoms.
232 # Otherwise globs like -O* have the potential to wipe out the
233 # list of flags.
234 new=()
235 for f in ${!var} ; do
236 # Note this should work with globs like -O*
237 [[ ${f} == ${1} ]] && f=${2}
238 new+=( "${f}" )
239 done
240 eval export ${var}=\""${new[*]}"\"
241 done
242
243 return 0
244 }
245
246 # @FUNCTION: replace-cpu-flags
247 # @USAGE: <old> <new>
248 # @DESCRIPTION:
249 # Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
250 # with flags that select the <new> cpu. Accepts shell globs for <old>.
251 replace-cpu-flags() {
252 local newcpu="$#" ; newcpu="${!newcpu}"
253 while [ $# -gt 1 ] ; do
254 # quote to make sure that no globbing is done (particularly on
255 # ${oldcpu}) prior to calling replace-flags
256 replace-flags "-march=${1}" "-march=${newcpu}"
257 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
258 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
259 shift
260 done
261 return 0
262 }
263
264 _is_flagq() {
265 local x
266 for x in ${!1} ; do
267 [[ ${x} == $2 ]] && return 0
268 done
269 return 1
270 }
271
272 # @FUNCTION: is-flagq
273 # @USAGE: <flag>
274 # @DESCRIPTION:
275 # Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
276 is-flagq() {
277 [[ -n $2 ]] && die "Usage: is-flag <flag>"
278
279 local var
280 for var in $(all-flag-vars) ; do
281 _is_flagq ${var} "$1" && return 0
282 done
283 return 1
284 }
285
286 # @FUNCTION: is-flag
287 # @USAGE: <flag>
288 # @DESCRIPTION:
289 # Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
290 is-flag() {
291 is-flagq "$@" && echo true
292 }
293
294 # @FUNCTION: is-ldflagq
295 # @USAGE: <flag>
296 # @DESCRIPTION:
297 # Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
298 is-ldflagq() {
299 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
300 _is_flagq LDFLAGS $1
301 }
302
303 # @FUNCTION: is-ldflag
304 # @USAGE: <flag>
305 # @DESCRIPTION:
306 # Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
307 is-ldflag() {
308 is-ldflagq "$@" && echo true
309 }
310
311 # @FUNCTION: filter-mfpmath
312 # @USAGE: <math types>
313 # @DESCRIPTION:
314 # Remove specified math types from the fpmath flag. For example, if the user
315 # has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
316 # -mfpmath=386.
317 filter-mfpmath() {
318 local orig_mfpmath new_math prune_math
319
320 # save the original -mfpmath flag
321 orig_mfpmath=$(get-flag -mfpmath)
322 # get the value of the current -mfpmath flag
323 new_math=$(get-flag mfpmath)
324 new_math=" ${new_math//,/ } "
325 # figure out which math values are to be removed
326 prune_math=""
327 for prune_math in "$@" ; do
328 new_math=${new_math/ ${prune_math} / }
329 done
330 new_math=$(echo ${new_math})
331 new_math=${new_math// /,}
332
333 if [[ -z ${new_math} ]] ; then
334 # if we're removing all user specified math values are
335 # slated for removal, then we just filter the flag
336 filter-flags ${orig_mfpmath}
337 else
338 # if we only want to filter some of the user specified
339 # math values, then we replace the current flag
340 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
341 fi
342 return 0
343 }
344
345 # @FUNCTION: strip-flags
346 # @DESCRIPTION:
347 # Strip C[XX]FLAGS of everything except known good/safe flags.
348 strip-flags() {
349 local x y var
350
351 setup-allowed-flags
352
353 set -f # disable pathname expansion
354
355 for var in $(all-flag-vars) ; do
356 local new=()
357
358 for x in ${!var} ; do
359 local flag=${x%%=*}
360 for y in ${ALLOWED_FLAGS} ; do
361 if [[ -z ${flag%%${y}} ]] ; then
362 new+=( "${x}" )
363 break
364 fi
365 done
366 done
367
368 # In case we filtered out all optimization flags fallback to -O2
369 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
370 new+=( -O2 )
371 fi
372
373 eval export ${var}=\""${new[*]}"\"
374 done
375
376 set +f # re-enable pathname expansion
377
378 return 0
379 }
380
381 test-flag-PROG() {
382 local comp=$1
383 local flag=$2
384
385 [[ -z ${comp} || -z ${flag} ]] && return 1
386
387 # use -c so we can test the assembler as well
388 local PROG=$(tc-get${comp})
389 ${PROG} "${flag}" -c -o /dev/null -xc /dev/null \
390 > /dev/null 2>&1
391 }
392
393 # @FUNCTION: test-flag-CC
394 # @USAGE: <flag>
395 # @DESCRIPTION:
396 # Returns shell true if <flag> is supported by the C compiler, else returns shell false.
397 test-flag-CC() { test-flag-PROG "CC" "$1"; }
398
399 # @FUNCTION: test-flag-CXX
400 # @USAGE: <flag>
401 # @DESCRIPTION:
402 # Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
403 test-flag-CXX() { test-flag-PROG "CXX" "$1"; }
404
405 # @FUNCTION: test-flag-F77
406 # @USAGE: <flag>
407 # @DESCRIPTION:
408 # Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
409 test-flag-F77() { test-flag-PROG "F77" "$1"; }
410
411 # @FUNCTION: test-flag-FC
412 # @USAGE: <flag>
413 # @DESCRIPTION:
414 # Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
415 test-flag-FC() { test-flag-PROG "FC" "$1"; }
416
417 test-flags-PROG() {
418 local comp=$1
419 local flags
420 local x
421
422 shift
423
424 [[ -z ${comp} ]] && return 1
425
426 for x in "$@" ; do
427 test-flag-${comp} "${x}" && flags="${flags}${flags:+ }${x}"
428 done
429
430 echo "${flags}"
431
432 # Just bail if we dont have any flags
433 [[ -n ${flags} ]]
434 }
435
436 # @FUNCTION: test-flags-CC
437 # @USAGE: <flags>
438 # @DESCRIPTION:
439 # Returns shell true if <flags> are supported by the C compiler, else returns shell false.
440 test-flags-CC() { test-flags-PROG "CC" "$@"; }
441
442 # @FUNCTION: test-flags-CXX
443 # @USAGE: <flags>
444 # @DESCRIPTION:
445 # Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
446 test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
447
448 # @FUNCTION: test-flags-F77
449 # @USAGE: <flags>
450 # @DESCRIPTION:
451 # Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
452 test-flags-F77() { test-flags-PROG "F77" "$@"; }
453
454 # @FUNCTION: test-flags-FC
455 # @USAGE: <flags>
456 # @DESCRIPTION:
457 # Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
458 test-flags-FC() { test-flags-PROG "FC" "$@"; }
459
460 # @FUNCTION: test-flags
461 # @USAGE: <flags>
462 # @DESCRIPTION:
463 # Short-hand that should hopefully work for both C and C++ compiler, but
464 # its really only present due to the append-flags() abomination.
465 test-flags() { test-flags-CC "$@"; }
466
467 # @FUNCTION: test_version_info
468 # @USAGE: <version>
469 # @DESCRIPTION:
470 # Returns shell true if the current C compiler version matches <version>, else returns shell false.
471 # Accepts shell globs.
472 test_version_info() {
473 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
474 return 0
475 else
476 return 1
477 fi
478 }
479
480 # @FUNCTION: strip-unsupported-flags
481 # @DESCRIPTION:
482 # Strip {C,CXX,F,FC}FLAGS of any flags not supported by the active toolchain.
483 strip-unsupported-flags() {
484 export CFLAGS=$(test-flags-CC ${CFLAGS})
485 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
486 export FFLAGS=$(test-flags-F77 ${FFLAGS})
487 export FCFLAGS=$(test-flags-FC ${FCFLAGS})
488 }
489
490 # @FUNCTION: get-flag
491 # @USAGE: <flag>
492 # @DESCRIPTION:
493 # Find and echo the value for a particular flag. Accepts shell globs.
494 get-flag() {
495 local f var findflag="$1"
496
497 # this code looks a little flaky but seems to work for
498 # everything we want ...
499 # for example, if CFLAGS="-march=i686":
500 # `get-flag -march` == "-march=i686"
501 # `get-flag march` == "i686"
502 for var in $(all-flag-vars) ; do
503 for f in ${!var} ; do
504 if [ "${f/${findflag}}" != "${f}" ] ; then
505 printf "%s\n" "${f/-${findflag}=}"
506 return 0
507 fi
508 done
509 done
510 return 1
511 }
512
513 # @FUNCTION: has_m64
514 # @DESCRIPTION:
515 # This doesn't test if the flag is accepted, it tests if the flag actually
516 # WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
517 # return code is 0, else the return code is 1.
518 has_m64() {
519 eqawarn "${FUNCNAME}: don't use this anymore"
520
521 # this doesnt test if the flag is accepted, it tests if the flag
522 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
523 # please dont replace this function with test_flag in some future
524 # clean-up!
525
526 local temp="$(emktemp)"
527 echo "int main() { return(0); }" > "${temp}".c
528 MY_CC=$(tc-getCC)
529 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
530 local ret=$?
531 rm -f "${temp}".c
532 [[ ${ret} != 1 ]] && return 0
533 return 1
534 }
535
536 has_m32() {
537 die "${FUNCNAME}: don't use this anymore"
538 }
539
540 # @FUNCTION: replace-sparc64-flags
541 # @DESCRIPTION:
542 # Sets mcpu to v8 and uses the original value as mtune if none specified.
543 replace-sparc64-flags() {
544 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
545
546 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
547 for x in ${SPARC64_CPUS}; do
548 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
549 done
550 else
551 for x in ${SPARC64_CPUS}; do
552 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
553 done
554 fi
555
556 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
557 for x in ${SPARC64_CPUS}; do
558 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
559 done
560 else
561 for x in ${SPARC64_CPUS}; do
562 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
563 done
564 fi
565
566 export CFLAGS CXXFLAGS
567 }
568
569 # @FUNCTION: append-libs
570 # @USAGE: <libs>
571 # @DESCRIPTION:
572 # Add extra <libs> to the current LIBS.
573 append-libs() {
574 [[ $# -eq 0 ]] && return 0
575 local flag
576 for flag in "$@"; do
577 [[ ${flag} == -l* ]] && flag=${flag#-l}
578 export LIBS="${LIBS} -l${flag}"
579 done
580
581 return 0
582 }
583
584 # @FUNCTION: raw-ldflags
585 # @USAGE: [flags]
586 # @DESCRIPTION:
587 # Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
588 # are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
589 # to gcc where it needs the '-Wl,'.
590 #
591 # If no flags are specified, then default to ${LDFLAGS}.
592 raw-ldflags() {
593 local x input="$@"
594 [[ -z ${input} ]] && input=${LDFLAGS}
595 set --
596 for x in ${input} ; do
597 x=${x#-Wl,}
598 set -- "$@" ${x//,/ }
599 done
600 echo "$@"
601 }
602
603 # @FUNCTION: no-as-needed
604 # @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
605 no-as-needed() {
606 case $($(tc-getLD) -v 2>&1 </dev/null) in
607 *GNU*) # GNU ld
608 echo "-Wl,--no-as-needed" ;;
609 esac
610 }
611
612 fi

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