summaryrefslogtreecommitdiff
blob: 2c7468cafbbbeca56f856c5dbd63bf3490598e86 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
# Copyright 1999-2006 Gentoo Foundation
# Distributed under the terms of the GNU General Public License v2
# $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.110 2006/08/01 00:49:16 vapier Exp $
#
# Maintainer: base-system@gentoo.org

# need access to emktemp()
inherit eutils toolchain-funcs multilib

#
#### filter-flags <flags> ####
# Remove particular flags from C[XX]FLAGS
# Matches only complete flags
#
#### append-flags <flags> ####
# Add extra flags to your current C[XX]FLAGS
#
#### replace-flags <orig.flag> <new.flag> ###
# Replace a flag by another one
#
#### replace-cpu-flags <old.cpus> <new.cpu> ###
# Replace march/mcpu flags that specify <old.cpus>
# with flags that specify <new.cpu>
#
#### is-flag[q] <flag> ####
# Returns "true" if flag is set in C[XX]FLAGS
# Matches only complete a flag
# q version sets return code but doesn't echo
#
#### is-ldflag[q] <flag> ####
# Returns "true" if flag is set in LDFLAGS
# Matches only complete a flag
# q version sets return code but doesn't echo
#
#### strip-flags ####
# Strip C[XX]FLAGS of everything except known
# good options.
#
#### strip-unsupported-flags ####
# Strip C[XX]FLAGS of any flags not supported by
# installed version of gcc
#
#### get-flag <flag> ####
# Find and echo the value for a particular flag
#
#### replace-sparc64-flags ####
# Sets mcpu to v8 and uses the original value
# as mtune if none specified.
#
#### filter-mfpmath <math types> ####
# Remove specified math types from the fpmath specification
# If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
# will leave the user with -mfpmath=386
#
#### append-ldflags ####
# Add extra flags to your current LDFLAGS
#
#### filter-ldflags <flags> ####
# Remove particular flags from LDFLAGS
# Matches only complete flags
#
#### bindnow-flags ####
# Returns the flags to enable "now" binding in the current selected linker.
#
################ DEPRECATED functions ################
# The following are still present to avoid breaking existing
# code more than necessary; however they are deprecated. Please
# use gcc-specs-* from toolchain-funcs.eclass instead, if you
# need to know which hardened techs are active in the compiler.
# See bug #100974
#
#### has_hardened ####
# Returns true if the compiler has 'Hardened' in its version string,
# (note; switched-spec vanilla compilers satisfy this condition) or
# the specs file name contains 'hardened'.
#
#### has_pie ####
# Returns true if the compiler by default or with current CFLAGS
# builds position-independent code.
#
#### has_pic ####
# Returns true if the compiler by default or with current CFLAGS
# builds position-independent code.
#
#### has_ssp_all ####
# Returns true if the compiler by default or with current CFLAGS
# generates stack smash protections for all functions
#
#### has_ssp ####
# Returns true if the compiler by default or with current CFLAGS
# generates stack smash protections for most vulnerable functions
#

# C[XX]FLAGS that we allow in strip-flags
setup-allowed-flags() {
	if [[ -z ${ALLOWED_FLAGS} ]] ; then
		export ALLOWED_FLAGS="-pipe"
		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -O -O0 -O1 -O2 -mcpu -march -mtune"
		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fstack-protector -fstack-protector-all"
		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fbounds-checking -fno-bounds-checking"
		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-PIE -fno-pie -fno-unit-at-a-time"
		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
		export ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-ident"
	fi
	# allow a bunch of flags that negate features / control ABI
	ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
	ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
		-mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
		-mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
		-msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
		-mieee -mieee-with-inexact -mschedule \
		-mtls-direct-seg-refs -mno-tls-direct-seg-refs \
		-mflat -mno-flat -mno-faster-structs -mfaster-structs \
		-m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
		-mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"

	# C[XX]FLAGS that we are think is ok, but needs testing
	# NOTE:  currently -Os have issues with gcc3 and K6* arch's
	export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks"
	return 0
}

# inverted filters for hardened compiler.  This is trying to unpick
# the hardened compiler defaults.
_filter-hardened() {
	local f
	for f in "$@" ; do
		case "${f}" in
			# Ideally we should only concern ourselves with PIE flags,
			# not -fPIC or -fpic, but too many places filter -fPIC without
			# thinking about -fPIE.
			-fPIC|-fpic|-fPIE|-fpie|-Wl,pie|-pie)
				gcc-specs-pie || continue
				is-flagq -nopie || append-flags -nopie;;
			-fstack-protector)
				gcc-specs-ssp || continue
				is-flagq -fno-stack-protector || append-flags -fno-stack-protector;;
			-fstack-protector-all)
				gcc-specs-ssp-to-all || continue
				is-flagq -fno-stack-protector-all || append-flags -fno-stack-protector-all;;
		esac
	done
}

# Remove occurrences of strings from variable given in $1
# Strings removed are matched as globs, so for example
# '-O*' would remove -O1, -O2 etc.
_filter-var() {
	local f x VAR VAL
	declare -a new

	VAR=$1
	shift
	eval VAL=\${${VAR}}
	for f in ${VAL}; do
		for x in "$@"; do
			# Note this should work with globs like -O*
			[[ ${f} == ${x} ]] && continue 2
		done
		eval new\[\${\#new\[@]}]=\${f}
	done
	eval export ${VAR}=\${new\[*]}
}

filter-flags() {
	_filter-hardened "$@"
	_filter-var CFLAGS "$@"
	_filter-var CXXFLAGS "$@"
	return 0
}

filter-lfs-flags() {
	[[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
	filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
}

append-lfs-flags() {
	[[ -n $@ ]] && die "append-lfs-flags takes no arguments"
	append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
}

append-flags() {
	[[ -z $* ]] && return 0
	export CFLAGS="${CFLAGS} $*"
	export CXXFLAGS="${CXXFLAGS} $*"
	return 0
}

replace-flags() {
	[[ $# != 2 ]] \
		&& echo && eerror "Usage: replace-flags <old flag> <new flag>" \
		&& die "replace-flags takes 2 arguments, not $#"

	local f fset
	declare -a new_CFLAGS new_CXXFLAGS

	for fset in CFLAGS CXXFLAGS; do
		# Looping over the flags instead of using a global
		# substitution ensures that we're working with flag atoms.
		# Otherwise globs like -O* have the potential to wipe out the
		# list of flags.
		for f in ${!fset}; do
			# Note this should work with globs like -O*
			[[ ${f} == ${1} ]] && f=${2}
			eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
		done
		eval export ${fset}=\${new_${fset}\[*]}
	done

	return 0
}

replace-cpu-flags() {
	local newcpu="$#" ; newcpu="${!newcpu}"
	while [ $# -gt 1 ] ; do
		# quote to make sure that no globbing is done (particularly on
		# ${oldcpu} prior to calling replace-flags
		replace-flags "-march=${1}" "-march=${newcpu}"
		replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
		replace-flags "-mtune=${1}" "-mtune=${newcpu}"
		shift
	done
	return 0
}

is-flagq() {
	local x

	for x in ${CFLAGS} ${CXXFLAGS} ; do
		# Note this should work with globs like -mcpu=ultrasparc*
		if [[ ${x} == ${1} ]]; then
			return 0
		fi
	done
	return 1
}

is-flag() {
	if is-flagq ${1}; then
		echo true
		return 0
	fi
	return 1
}

is-ldflagq() {
	local x

	for x in ${LDFLAGS} ; do
		# Note this should work with globs like -mcpu=ultrasparc*
		if [[ ${x} == ${1} ]]; then
			return 0
		fi
	done
	return 1
}

is-ldflag() {
	if is-ldflagq ${1}; then
		echo true
		return 0
	fi
	return 1
}

filter-mfpmath() {
	local orig_mfpmath new_math prune_math

	# save the original -mfpmath flag
	orig_mfpmath=$(get-flag -mfpmath)
	# get the value of the current -mfpmath flag
	new_math=$(get-flag mfpmath)
	new_math=" ${new_math//,/ } "
	# figure out which math values are to be removed
	prune_math=""
	for prune_math in "$@" ; do
		new_math=${new_math/ ${prune_math} / }
	done
	new_math=$(echo ${new_math})
	new_math=${new_math// /,}

	if [[ -z ${new_math} ]] ; then
		# if we're removing all user specified math values are
		# slated for removal, then we just filter the flag
		filter-flags ${orig_mfpmath}
	else
		# if we only want to filter some of the user specified
		# math values, then we replace the current flag
		replace-flags ${orig_mfpmath} -mfpmath=${new_math}
	fi
	return 0
}

strip-flags() {
	local x y flag NEW_CFLAGS NEW_CXXFLAGS

	setup-allowed-flags

	local NEW_CFLAGS=""
	local NEW_CXXFLAGS=""

	# Allow unstable C[XX]FLAGS if we are using unstable profile ...
	if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
		ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
	fi

	set -f	# disable pathname expansion

	for x in ${CFLAGS}; do
		for y in ${ALLOWED_FLAGS}; do
			flag=${x%%=*}
			if [ "${flag%%${y}}" = "" ] ; then
				NEW_CFLAGS="${NEW_CFLAGS} ${x}"
				break
			fi
		done
	done

	for x in ${CXXFLAGS}; do
		for y in ${ALLOWED_FLAGS}; do
			flag=${x%%=*}
			if [ "${flag%%${y}}" = "" ] ; then
				NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
				break
			fi
		done
	done

	# In case we filtered out all optimization flags fallback to -O2
	if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
		NEW_CFLAGS="${NEW_CFLAGS} -O2"
	fi
	if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
		NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
	fi

	set +f	# re-enable pathname expansion

	export CFLAGS="${NEW_CFLAGS}"
	export CXXFLAGS="${NEW_CXXFLAGS}"
	return 0
}

test-flag-PROG() {
	local comp=$1
	local flags="$2"

	[[ -z ${comp} || -z ${flags} ]] && \
		return 1

	local PROG=$(tc-get${comp})
	${PROG} ${flags} -S -o /dev/null -xc /dev/null \
		> /dev/null 2>&1
}

# Returns true if C compiler support given flag
test-flag-CC() { test-flag-PROG "CC" "$1"; }

# Returns true if C++ compiler support given flag
test-flag-CXX() { test-flag-PROG "CXX" "$1"; }

test-flags-PROG() {
	local comp=$1
	local flags
	local x

	shift

	[[ -z ${comp} ]] && \
		return 1

	for x in "$@" ; do
		test-flag-${comp} "${x}" && flags="${flags} ${x}"
	done

	echo "${flags}"

	# Just bail if we dont have any flags
	[[ -n ${flags} ]]
}

# Returns (echo's) the given flags supported by the C compiler
test-flags-CC() { test-flags-PROG "CC" "$@"; }

# Returns (echo's) the given flags supported by the C++ compiler
test-flags-CXX() { test-flags-PROG "CXX" "$@"; }

# Short-hand that should hopefully work for both C and C++ compiler, but
# its really only present due to the append-flags() abomination.
test-flags() { test-flags-CC "$@"; }

# Depriciated, use test-flags()
test_flag() {
	ewarn "test_flag: deprecated, please use test-flags()!" >&2

	test-flags-CC "$@"
}

test_version_info() {
	if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
		return 0
	else
		return 1
	fi
}

strip-unsupported-flags() {
	local x NEW_CFLAGS NEW_CXXFLAGS

	for x in ${CFLAGS} ; do
		NEW_CFLAGS="${NEW_CFLAGS} $(test-flags ${x})"
	done
	for x in ${CXXFLAGS} ; do
		NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test-flags ${x})"
	done

	export CFLAGS=${NEW_CFLAGS}
	export CXXFLAGS=${NEW_CXXFLAGS}
}

get-flag() {
	local f findflag="$1"

	# this code looks a little flaky but seems to work for
	# everything we want ...
	# for example, if CFLAGS="-march=i686":
	# `get-flag -march` == "-march=i686"
	# `get-flag march` == "i686"
	for f in ${CFLAGS} ${CXXFLAGS} ; do
		if [ "${f/${findflag}}" != "${f}" ] ; then
			printf "%s\n" "${f/-${findflag}=}"
			return 0
		fi
	done
	return 1
}

# DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
has_hardened() {
	ewarn "has_hardened: deprecated, please use gcc-specs-{relro,now}()!" >&2

	test_version_info Hardened && return 0
	# The specs file wont exist unless gcc has GCC_SPECS support
	[[ -f ${GCC_SPECS} && ${GCC_SPECS} != ${GCC_SPECS/hardened/} ]]
}

# DEPRECATED - use gcc-specs-pie from toolchain-funcs
# indicate whether PIC is set
has_pic() {
	ewarn "has_pic: deprecated, please use gcc-specs-pie()!" >&2

	[[ ${CFLAGS/-fPIC} != ${CFLAGS} || \
	   ${CFLAGS/-fpic} != ${CFLAGS} ]] || \
	gcc-specs-pie
}

# DEPRECATED - use gcc-specs-pie from toolchain-funcs
# indicate whether PIE is set
has_pie() {
	ewarn "has_pie: deprecated, please use gcc-specs-pie()!" >&2

	[[ ${CFLAGS/-fPIE} != ${CFLAGS} || \
	   ${CFLAGS/-fpie} != ${CFLAGS} ]] || \
	gcc-specs-pie
}

# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
# indicate whether code for SSP is being generated for all functions
has_ssp_all() {
	ewarn "has_ssp_all: deprecated, please use gcc-specs-ssp()!" >&2

	# note; this matches only -fstack-protector-all
	[[ ${CFLAGS/-fstack-protector-all} != ${CFLAGS} || \
	   -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__) ]] || \
	gcc-specs-ssp-all
}

# DEPRECATED - use gcc-specs-ssp from toolchain-funcs
# indicate whether code for SSP is being generated
has_ssp() {
	ewarn "has_ssp: deprecated, please use gcc-specs-ssp()!" >&2

	# note; this matches both -fstack-protector and -fstack-protector-all
	[[ ${CFLAGS/-fstack-protector} != ${CFLAGS} || \
	   -n $(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__) ]] || \
	gcc-specs-ssp
}

has_m64() {
	# this doesnt test if the flag is accepted, it tests if the flag
	# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
	# please dont replace this function with test_flag in some future
	# clean-up!

	local temp="$(emktemp)"
	echo "int main() { return(0); }" > "${temp}".c
	MY_CC=$(tc-getCC)
	${MY_CC/ .*/} -m64 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
	local ret=$?
	rm -f "${temp}".c
	[[ ${ret} != 1 ]] && return 0
	return 1
}

has_m32() {
	# this doesnt test if the flag is accepted, it tests if the flag
	# actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
	# please dont replace this function with test_flag in some future
	# clean-up!

	[ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0

	local temp=$(emktemp)
	echo "int main() { return(0); }" > "${temp}".c
	MY_CC=$(tc-getCC)
	${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
	local ret=$?
	rm -f "${temp}".c
	[[ ${ret} != 1 ]] && return 0
	return 1
}

replace-sparc64-flags() {
	local SPARC64_CPUS="ultrasparc3 ultrasparc v9"

	if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
		for x in ${SPARC64_CPUS}; do
			CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
		done
	else
	 	for x in ${SPARC64_CPUS}; do
			CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
		done
	fi

	if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
		for x in ${SPARC64_CPUS}; do
			CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
		done
	else
	 	for x in ${SPARC64_CPUS}; do
			CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
		done
	fi

	export CFLAGS CXXFLAGS
}

append-ldflags() {
	[[ -z $* ]] && return 0
	export LDFLAGS="${LDFLAGS} $*"
	return 0
}

# Remove flags from LDFLAGS - it's up to the ebuild to filter
# CFLAGS and CXXFLAGS via filter-flags if they need to.
filter-ldflags() {
	_filter-var LDFLAGS "$@"
	return 0
}

# Turn C style ldflags (-Wl,-foo) into straight ldflags - the results
# are suitable for passing directly to 'ld'; note LDFLAGS is usually passed
# to gcc where it needs the '-Wl,'.
raw-ldflags() {
	local x input="$@"
	[[ -z ${input} ]] && input=${LDFLAGS}
	set --
	for x in ${input} ; do
		x=${x#-Wl,}
		set -- "$@" ${x//,/ }
	done
	echo "$@"
}

# This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
# bug #9016.  Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
# fixes.
#
# Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
gcc2-flags() {
	if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
		CFLAGS=${CFLAGS//-mtune=/-mcpu=}
		CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
	fi

	replace-cpu-flags k6-{2,3} k6
	replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686

	replace-cpu-flags pentium-mmx i586
	replace-cpu-flags pentium{2,3,4} i686

	replace-cpu-flags ev6{7,8} ev6

	export CFLAGS CXXFLAGS
}

# Gets the flags needed for "NOW" binding
bindnow-flags() {
	case $($(tc-getLD) -v 2>&1 </dev/null) in
	*GNU* | *'with BFD'*) # GNU ld
		echo "-Wl,-z,now" ;;
	*Apple*) # Darwin ld
		echo "-bind_at_load" ;;
	*)
		# Some linkers just recognize -V instead of -v
		case $($(tc-getLD) -V 2>&1 </dev/null) in
			*Solaris*) # Solaris accept almost the same GNU options
				echo "-Wl,-z,now" ;;
		esac
		;;
	esac
}