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Revision 1.40 Revision 1.185
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 1.40 2004/03/12 11:21:15 vapier Exp $ 3# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.185 2012/12/03 21:20:54 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,CCAS,F,FC,LD}FLAGS
21}
22
63# C[XX]FLAGS that we allow in strip-flags 23# {C,CPP,CXX,CCAS,F,FC,LD}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 # 4.7
56 ALLOWED_FLAGS+=" -mno-avx2 -mno-bmi2 -mno-fma -mno-lzcnt"
57
58 # CPPFLAGS and LDFLAGS
59 ALLOWED_FLAGS+=" -I* -L* -R* -Wl,*"
60
61 export ALLOWED_FLAGS
62 return 0
63}
64
65# inverted filters for hardened compiler. This is trying to unpick
66# the hardened compiler defaults.
67_filter-hardened() {
68 local f
69 for f in "$@" ; do
66 case "${ARCH}" in 70 case "${f}" in
67 mips) ALLOWED_FLAGS="${ALLOWED_FLAGS} -mips1 -mips2 -mips3 -mips4 -mabi" ;; 71 # Ideally we should only concern ourselves with PIE flags,
68 amd64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 72 # not -fPIC or -fpic, but too many places filter -fPIC without
69 alpha) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 73 # thinking about -fPIE.
70 ia64) ALLOWED_FLAGS="${ALLOWED_FLAGS} -fPIC" ;; 74 -fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
75 gcc-specs-pie || continue
76 is-flagq -nopie || append-flags -nopie;;
77 -fstack-protector)
78 gcc-specs-ssp || continue
79 is-flagq -fno-stack-protector || append-flags $(test-flags -fno-stack-protector);;
80 -fstack-protector-all)
81 gcc-specs-ssp-to-all || continue
82 is-flagq -fno-stack-protector-all || append-flags $(test-flags -fno-stack-protector-all);;
83 -fno-strict-overflow)
84 gcc-specs-nostrict || continue
85 is-flagq -fstrict-overflow || append-flags $(test-flags -fstrict-overflow);;
86 esac
87 done
88}
89
90# Remove occurrences of strings from variable given in $1
91# Strings removed are matched as globs, so for example
92# '-O*' would remove -O1, -O2 etc.
93_filter-var() {
94 local f x var=$1 new=()
95 shift
96
97 for f in ${!var} ; do
98 for x in "$@" ; do
99 # Note this should work with globs like -O*
100 [[ ${f} == ${x} ]] && continue 2
101 done
102 new+=( "${f}" )
103 done
104 eval export ${var}=\""${new[*]}"\"
105}
106
107# @FUNCTION: filter-flags
108# @USAGE: <flags>
109# @DESCRIPTION:
110# Remove particular <flags> from {C,CPP,CXX,CCAS,F,FC,LD}FLAGS. Accepts shell globs.
111filter-flags() {
112 _filter-hardened "$@"
113 local v
114 for v in $(all-flag-vars) ; do
115 _filter-var ${v} "$@"
116 done
117 return 0
118}
119
120# @FUNCTION: filter-lfs-flags
121# @DESCRIPTION:
122# Remove flags that enable Large File Support.
123filter-lfs-flags() {
124 [[ $# -ne 0 ]] && die "filter-lfs-flags takes no arguments"
125 # http://www.gnu.org/s/libc/manual/html_node/Feature-Test-Macros.html
126 # _LARGEFILE_SOURCE: enable support for new LFS funcs (ftello/etc...)
127 # _LARGEFILE64_SOURCE: enable support for 64bit variants (off64_t/fseeko64/etc...)
128 # _FILE_OFFSET_BITS: default to 64bit variants (off_t is defined as off64_t)
129 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
130}
131
132# @FUNCTION: filter-ldflags
133# @USAGE: <flags>
134# @DESCRIPTION:
135# Remove particular <flags> from LDFLAGS. Accepts shell globs.
136filter-ldflags() {
137 _filter-var LDFLAGS "$@"
138 return 0
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-ldflags
192# @USAGE: <flags>
193# @DESCRIPTION:
194# Add extra <flags> to the current LDFLAGS.
195append-ldflags() {
196 [[ $# -eq 0 ]] && return 0
197 local flag
198 for flag in "$@"; do
199 [[ ${flag} == -l* ]] && \
200 eqawarn "Appending a library link instruction (${flag}); libraries to link to should not be passed through LDFLAGS"
201 done
202
203 export LDFLAGS="${LDFLAGS} $*"
204 return 0
205}
206
207# @FUNCTION: append-flags
208# @USAGE: <flags>
209# @DESCRIPTION:
210# Add extra <flags> to your current {C,CXX,F,FC}FLAGS.
211append-flags() {
212 [[ $# -eq 0 ]] && return 0
213 case " $* " in
214 *' '-[DIU]*) eqawarn 'please use append-cppflags for preprocessor flags' ;;
215 *' '-L*|\
216 *' '-Wl,*) eqawarn 'please use append-ldflags for linker flags' ;;
71 esac 217 esac
72 218 append-cflags "$@"
73 # C[XX]FLAGS that we are think is ok, but needs testing 219 append-cxxflags "$@"
74 # NOTE: currently -Os have issues with gcc3 and K6* arch's 220 append-fflags "$@"
75 export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
76 return 0 221 return 0
77} 222}
78 223
79filter-flags() { 224# @FUNCTION: replace-flags
80 for x in "$@" ; do 225# @USAGE: <old> <new>
81 case "${x}" in 226# @DESCRIPTION:
82 -fPIC|-fpic|-fPIE|-fpie|-pie) etexec-flags;; 227# 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:${#CXXFLAGS}-2}"
98 return 0
99}
100
101filter-lfs-flags() {
102 filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
103}
104
105append-flags() {
106 export CFLAGS="${CFLAGS} $@"
107 export CXXFLAGS="${CXXFLAGS} $@"
108 [ "`is-flag -fno-stack-protector`" -o "`is-flag -fno-stack-protector-all`" ] && fstack-flags
109 return 0
110}
111
112replace-flags() { 228replace-flags() {
113 # we do this fancy spacing stuff so as to not filter 229 [[ $# != 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}
123 230
231 local f var new
232 for var in $(all-flag-vars) ; do
233 # Looping over the flags instead of using a global
234 # substitution ensures that we're working with flag atoms.
235 # Otherwise globs like -O* have the potential to wipe out the
236 # list of flags.
237 new=()
238 for f in ${!var} ; do
239 # Note this should work with globs like -O*
240 [[ ${f} == ${1} ]] && f=${2}
241 new+=( "${f}" )
242 done
243 eval export ${var}=\""${new[*]}"\"
244 done
245
246 return 0
247}
248
249# @FUNCTION: replace-cpu-flags
250# @USAGE: <old> <new>
251# @DESCRIPTION:
252# Replace cpu flags (like -march/-mcpu/-mtune) that select the <old> cpu
253# with flags that select the <new> cpu. Accepts shell globs for <old>.
124replace-cpu-flags() { 254replace-cpu-flags() {
125 local newcpu="$1" ; shift 255 local newcpu="$#" ; newcpu="${!newcpu}"
126 local oldcpu="" 256 while [ $# -gt 1 ] ; do
127 for oldcpu in "$@" ; do 257 # quote to make sure that no globbing is done (particularly on
258 # ${oldcpu}) prior to calling replace-flags
128 replace-flags -march=${oldcpu} -march=${newcpu} 259 replace-flags "-march=${1}" "-march=${newcpu}"
129 replace-flags -mcpu=${oldcpu} -mcpu=${newcpu} 260 replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
130 replace-flags -mtune=${oldcpu} -mtune=${newcpu} 261 replace-flags "-mtune=${1}" "-mtune=${newcpu}"
262 shift
131 done 263 done
264 return 0
265}
266
267_is_flagq() {
268 local x var
269 eval var=\""\${$1[*]}"\"
270 for x in ${var} ; do
271 [[ ${x} == $2 ]] && return 0
272 done
132 return 0 273 return 1
133} 274}
134 275
276# @FUNCTION: is-flagq
277# @USAGE: <flag>
278# @DESCRIPTION:
279# Returns shell true if <flag> is in {C,CXX,F,FC}FLAGS, else returns shell false. Accepts shell globs.
280is-flagq() {
281 [[ -n $2 ]] && die "Usage: is-flag <flag>"
282
283 local var
284 for var in $(all-flag-vars) ; do
285 _is_flagq ${var} "$1" && return 0
286 done
287 return 1
288}
289
290# @FUNCTION: is-flag
291# @USAGE: <flag>
292# @DESCRIPTION:
293# Echo's "true" if flag is set in {C,CXX,F,FC}FLAGS. Accepts shell globs.
135is-flag() { 294is-flag() {
136 for x in ${CFLAGS} ${CXXFLAGS} ; do 295 is-flagq "$@" && echo true
137 if [ "${x}" == "$1" ] ; then
138 echo true
139 return 0
140 fi
141 done
142 return 1
143} 296}
144 297
298# @FUNCTION: is-ldflagq
299# @USAGE: <flag>
300# @DESCRIPTION:
301# Returns shell true if <flag> is in LDFLAGS, else returns shell false. Accepts shell globs.
302is-ldflagq() {
303 [[ -n $2 ]] && die "Usage: is-ldflag <flag>"
304 _is_flagq LDFLAGS $1
305}
306
307# @FUNCTION: is-ldflag
308# @USAGE: <flag>
309# @DESCRIPTION:
310# Echo's "true" if flag is set in LDFLAGS. Accepts shell globs.
311is-ldflag() {
312 is-ldflagq "$@" && echo true
313}
314
315# @FUNCTION: filter-mfpmath
316# @USAGE: <math types>
317# @DESCRIPTION:
318# Remove specified math types from the fpmath flag. For example, if the user
319# has -mfpmath=sse,386, running `filter-mfpmath sse` will leave the user with
320# -mfpmath=386.
145filter-mfpmath() { 321filter-mfpmath() {
322 local orig_mfpmath new_math prune_math
323
146 # save the original -mfpmath flag 324 # save the original -mfpmath flag
147 local orig_mfpmath="`get-flag -mfpmath`" 325 orig_mfpmath=$(get-flag -mfpmath)
148 # get the value of the current -mfpmath flag 326 # get the value of the current -mfpmath flag
149 local new_math=" `get-flag mfpmath | tr , ' '` " 327 new_math=$(get-flag mfpmath)
328 new_math=" ${new_math//,/ } "
150 # figure out which math values are to be removed 329 # figure out which math values are to be removed
151 local prune_math="" 330 prune_math=""
152 for prune_math in "$@" ; do 331 for prune_math in "$@" ; do
153 new_math="${new_math/ ${prune_math} / }" 332 new_math=${new_math/ ${prune_math} / }
154 done 333 done
155 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`" 334 new_math=$(echo ${new_math})
335 new_math=${new_math// /,}
156 336
157 if [ -z "${new_math}" ] ; then 337 if [[ -z ${new_math} ]] ; then
158 # if we're removing all user specified math values are 338 # if we're removing all user specified math values are
159 # slated for removal, then we just filter the flag 339 # slated for removal, then we just filter the flag
160 filter-flags ${orig_mfpmath} 340 filter-flags ${orig_mfpmath}
161 else 341 else
162 # if we only want to filter some of the user specified 342 # if we only want to filter some of the user specified
164 replace-flags ${orig_mfpmath} -mfpmath=${new_math} 344 replace-flags ${orig_mfpmath} -mfpmath=${new_math}
165 fi 345 fi
166 return 0 346 return 0
167} 347}
168 348
349# @FUNCTION: strip-flags
350# @DESCRIPTION:
351# Strip *FLAGS of everything except known good/safe flags. This runs over all
352# flags returned by all_flag_vars().
169strip-flags() { 353strip-flags() {
354 local x y var
355
170 setup-allowed-flags 356 setup-allowed-flags
171 357
172 local NEW_CFLAGS="" 358 set -f # disable pathname expansion
173 local NEW_CXXFLAGS=""
174 359
175 # Allow unstable C[XX]FLAGS if we are using unstable profile ... 360 for var in $(all-flag-vars) ; do
176 if [ `has ~${ARCH} ${ACCEPT_KEYWORDS}` ] ; then 361 local new=()
177 [ `use debug` ] && einfo "Enabling the use of some unstable flags" 362
178 ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}" 363 for x in ${!var} ; do
364 local flag=${x%%=*}
365 for y in ${ALLOWED_FLAGS} ; do
366 if [[ -z ${flag%%${y}} ]] ; then
367 new+=( "${x}" )
368 break
369 fi
370 done
371 done
372
373 # In case we filtered out all optimization flags fallback to -O2
374 if _is_flagq ${var} "-O*" && ! _is_flagq new "-O*" ; then
375 new+=( -O2 )
376 fi
377
378 eval export ${var}=\""${new[*]}"\"
379 done
380
381 set +f # re-enable pathname expansion
382
383 return 0
384}
385
386test-flag-PROG() {
387 local comp=$1
388 local lang=$2
389 local flag=$3
390
391 [[ -z ${comp} || -z ${flag} ]] && return 1
392
393 # use -c so we can test the assembler as well
394 local PROG=$(tc-get${comp})
395 ${PROG} "${flag}" -c -o /dev/null -x${lang} - < /dev/null \
396 > /dev/null 2>&1
397}
398
399# @FUNCTION: test-flag-CC
400# @USAGE: <flag>
401# @DESCRIPTION:
402# Returns shell true if <flag> is supported by the C compiler, else returns shell false.
403test-flag-CC() { test-flag-PROG "CC" c "$1"; }
404
405# @FUNCTION: test-flag-CXX
406# @USAGE: <flag>
407# @DESCRIPTION:
408# Returns shell true if <flag> is supported by the C++ compiler, else returns shell false.
409test-flag-CXX() { test-flag-PROG "CXX" c++ "$1"; }
410
411# @FUNCTION: test-flag-F77
412# @USAGE: <flag>
413# @DESCRIPTION:
414# Returns shell true if <flag> is supported by the Fortran 77 compiler, else returns shell false.
415test-flag-F77() { test-flag-PROG "F77" f77 "$1"; }
416
417# @FUNCTION: test-flag-FC
418# @USAGE: <flag>
419# @DESCRIPTION:
420# Returns shell true if <flag> is supported by the Fortran 90 compiler, else returns shell false.
421test-flag-FC() { test-flag-PROG "FC" f95 "$1"; }
422
423test-flags-PROG() {
424 local comp=$1
425 local flags=()
426 local x
427
428 shift
429
430 [[ -z ${comp} ]] && return 1
431
432 for x ; do
433 test-flag-${comp} "${x}" && flags+=( "${x}" )
434 done
435
436 echo "${flags[*]}"
437
438 # Just bail if we dont have any flags
439 [[ ${#flags[@]} -gt 0 ]]
440}
441
442# @FUNCTION: test-flags-CC
443# @USAGE: <flags>
444# @DESCRIPTION:
445# Returns shell true if <flags> are supported by the C compiler, else returns shell false.
446test-flags-CC() { test-flags-PROG "CC" "$@"; }
447
448# @FUNCTION: test-flags-CXX
449# @USAGE: <flags>
450# @DESCRIPTION:
451# Returns shell true if <flags> are supported by the C++ compiler, else returns shell false.
452test-flags-CXX() { test-flags-PROG "CXX" "$@"; }
453
454# @FUNCTION: test-flags-F77
455# @USAGE: <flags>
456# @DESCRIPTION:
457# Returns shell true if <flags> are supported by the Fortran 77 compiler, else returns shell false.
458test-flags-F77() { test-flags-PROG "F77" "$@"; }
459
460# @FUNCTION: test-flags-FC
461# @USAGE: <flags>
462# @DESCRIPTION:
463# Returns shell true if <flags> are supported by the Fortran 90 compiler, else returns shell false.
464test-flags-FC() { test-flags-PROG "FC" "$@"; }
465
466# @FUNCTION: test-flags
467# @USAGE: <flags>
468# @DESCRIPTION:
469# Short-hand that should hopefully work for both C and C++ compiler, but
470# its really only present due to the append-flags() abomination.
471test-flags() { test-flags-CC "$@"; }
472
473# @FUNCTION: test_version_info
474# @USAGE: <version>
475# @DESCRIPTION:
476# Returns shell true if the current C compiler version matches <version>, else returns shell false.
477# Accepts shell globs.
478test_version_info() {
479 if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
480 return 0
481 else
482 return 1
179 fi 483 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="${NEW_CXXFLAGS}"
225 return 0
226} 484}
227 485
228test_flag() { 486# @FUNCTION: strip-unsupported-flags
229 if gcc -S -xc "$@" -o /dev/null /dev/null >/dev/null 2>&1; then 487# @DESCRIPTION:
230 echo "$@" 488# 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() { 489strip-unsupported-flags() {
237 for x in ${CFLAGS} ; do 490 export CFLAGS=$(test-flags-CC ${CFLAGS})
238 NEW_CFLAGS=${NEW_CFLAGS}" ""`test_flag ${x}`" 491 export CXXFLAGS=$(test-flags-CXX ${CXXFLAGS})
239 done 492 export FFLAGS=$(test-flags-F77 ${FFLAGS})
240 for x in ${CXXFLAGS} ; do 493 export FCFLAGS=$(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} 494}
247 495
496# @FUNCTION: get-flag
497# @USAGE: <flag>
498# @DESCRIPTION:
499# Find and echo the value for a particular flag. Accepts shell globs.
248get-flag() { 500get-flag() {
501 local f var findflag="$1"
502
249 # this code looks a little flaky but seems to work for 503 # this code looks a little flaky but seems to work for
250 # everything we want ... 504 # everything we want ...
251 # for example, if CFLAGS="-march=i686": 505 # for example, if CFLAGS="-march=i686":
252 # `get-flags -march` == "-march=i686" 506 # `get-flag -march` == "-march=i686"
253 # `get-flags march` == "i686" 507 # `get-flag march` == "i686"
254 local findflag="$1" 508 for var in $(all-flag-vars) ; do
255 for f in ${CFLAGS} ${CXXFLAGS} ; do 509 for f in ${!var} ; do
256 if [ "${f/${findflag}}" != "${f}" ] ; then 510 if [ "${f/${findflag}}" != "${f}" ] ; then
257 echo "${f/-${findflag}=}" 511 printf "%s\n" "${f/-${findflag}=}"
258 return 0 512 return 0
259 fi 513 fi
514 done
260 done 515 done
261 return 1 516 return 1
262} 517}
263 518
519# @FUNCTION: has_m64
520# @DESCRIPTION:
521# This doesn't test if the flag is accepted, it tests if the flag actually
522# WORKS. Non-multilib gcc will take both -m32 and -m64. If the flag works
523# return code is 0, else the return code is 1.
524has_m64() {
525 eqawarn "${FUNCNAME}: don't use this anymore"
526
527 # this doesnt test if the flag is accepted, it tests if the flag
528 # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
529 # please dont replace this function with test_flag in some future
530 # clean-up!
531
532 local temp="$(emktemp)"
533 echo "int main() { return(0); }" > "${temp}".c
534 MY_CC=$(tc-getCC)
535 ${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
536 local ret=$?
537 rm -f "${temp}".c
538 [[ ${ret} != 1 ]] && return 0
539 return 1
540}
541
542has_m32() {
543 die "${FUNCNAME}: don't use this anymore"
544}
545
546# @FUNCTION: replace-sparc64-flags
547# @DESCRIPTION:
548# Sets mcpu to v8 and uses the original value as mtune if none specified.
264replace-sparc64-flags() { 549replace-sparc64-flags() {
265 local SPARC64_CPUS="ultrasparc v9" 550 local SPARC64_CPUS="ultrasparc3 ultrasparc v9"
266 551
267 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ] 552 if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
268 then
269 for x in ${SPARC64_CPUS} 553 for x in ${SPARC64_CPUS}; do
270 do
271 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}" 554 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
272 done 555 done
273 else 556 else
274 for x in ${SPARC64_CPUS} 557 for x in ${SPARC64_CPUS}; do
275 do
276 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 558 CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
277 done 559 done
278 fi 560 fi
279 561
280 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ] 562 if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
281 then
282 for x in ${SPARC64_CPUS} 563 for x in ${SPARC64_CPUS}; do
283 do
284 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}" 564 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
285 done 565 done
286 else 566 else
287 for x in ${SPARC64_CPUS} 567 for x in ${SPARC64_CPUS}; do
288 do
289 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}" 568 CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
290 done 569 done
291 fi 570 fi
292}
293 571
572 export CFLAGS CXXFLAGS
573}
574
575# @FUNCTION: append-libs
576# @USAGE: <libs>
577# @DESCRIPTION:
578# Add extra <libs> to the current LIBS.
294append-ldflags() { 579append-libs() {
295 LDFLAGS="${LDFLAGS} $@" 580 [[ $# -eq 0 ]] && return 0
296 return 0 581 local flag
297} 582 for flag in "$@"; do
583 [[ ${flag} == -l* ]] && flag=${flag#-l}
584 export LIBS="${LIBS} -l${flag}"
585 done
298 586
299etexec-flags() { 587 return 0
300 has_version sys-devel/hardened-gcc 588}
301 if [ $? == 0 ] ; then 589
302 if [ "`is-flag -yet_exec`" != "true" ]; then 590# @FUNCTION: raw-ldflags
303 debug-print ">>> appending flags -yet_exec" 591# @USAGE: [flags]
304 append-flags -yet_exec 592# @DESCRIPTION:
305 append-ldflags -yet_exec 593# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
306 fi 594# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
595# to gcc where it needs the '-Wl,'.
596#
597# If no flags are specified, then default to ${LDFLAGS}.
598raw-ldflags() {
599 local x input="$@"
600 [[ -z ${input} ]] && input=${LDFLAGS}
601 set --
602 for x in ${input} ; do
603 case ${x} in
604 -Wl,*)
605 x=${x#-Wl,}
606 set -- "$@" ${x//,/ }
607 ;;
608 *) # Assume it's a compiler driver flag, so throw it away #441808
609 ;;
610 esac
611 done
612 echo "$@"
613}
614
615# @FUNCTION: no-as-needed
616# @RETURN: Flag to disable asneeded behavior for use with append-ldflags.
617no-as-needed() {
618 case $($(tc-getLD) -v 2>&1 </dev/null) in
619 *GNU*) # GNU ld
620 echo "-Wl,--no-as-needed" ;;
621 esac
622}
623
307 fi 624fi
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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