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Revision 1.1.1.1 - (hide annotations) (download) (vendor branch)
Wed Nov 30 09:59:19 2005 UTC (8 years, 4 months ago) by chriswhite
Changes since 1.1: +508 -11 lines
*** empty log message ***

1 chriswhite 1.1.1.1 # Copyright 1999-2005 Gentoo Foundation
2 verwilst 1.1 # Distributed under the terms of the GNU General Public License v2
3 chriswhite 1.1.1.1 # $Header: /var/cvsroot/gentoo-x86/eclass/flag-o-matic.eclass,v 1.95 2005/10/13 05:33:34 vapier Exp $
4 verwilst 1.1
5    
6 chriswhite 1.1.1.1 # need access to emktemp()
7     inherit eutils toolchain-funcs multilib
8    
9     #
10     #### filter-flags <flags> ####
11     # Remove particular flags from C[XX]FLAGS
12     # Matches only complete flags
13     #
14     #### append-flags <flags> ####
15     # Add extra flags to your current C[XX]FLAGS
16     #
17     #### replace-flags <orig.flag> <new.flag> ###
18     # Replace a flag by another one
19     #
20     #### replace-cpu-flags <old.cpus> <new.cpu> ###
21     # Replace march/mcpu flags that specify <old.cpus>
22     # with flags that specify <new.cpu>
23     #
24     #### is-flag <flag> ####
25     # Returns "true" if flag is set in C[XX]FLAGS
26     # Matches only complete a flag
27     #
28     #### strip-flags ####
29     # Strip C[XX]FLAGS of everything except known
30     # good options.
31     #
32     #### strip-unsupported-flags ####
33     # Strip C[XX]FLAGS of any flags not supported by
34     # installed version of gcc
35     #
36     #### get-flag <flag> ####
37     # Find and echo the value for a particular flag
38     #
39     #### replace-sparc64-flags ####
40     # Sets mcpu to v8 and uses the original value
41     # as mtune if none specified.
42     #
43     #### filter-mfpmath <math types> ####
44     # Remove specified math types from the fpmath specification
45     # If the user has -mfpmath=sse,386, running `filter-mfpmath sse`
46     # will leave the user with -mfpmath=386
47     #
48     #### append-ldflags ####
49     # Add extra flags to your current LDFLAGS
50     #
51     #### filter-ldflags <flags> ####
52     # Remove particular flags from LDFLAGS
53     # Matches only complete flags
54     #
55     #### fstack-flags ####
56     # hooked function for hardened gcc that appends
57     # -fno-stack-protector to {C,CXX,LD}FLAGS
58     # when a package is filtering -fstack-protector, -fstack-protector-all
59     # notice: modern automatic specs files will also suppress -fstack-protector-all
60     # when only -fno-stack-protector is given
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     #
93    
94     # C[XX]FLAGS that we allow in strip-flags
95     setup-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="${ALLOWED_FLAGS} -fno-pie -fno-unit-at-a-time"
102     export ALLOWED_FLAGS="${ALLOWED_FLAGS} -g -g0 -g1 -g2 -g3 -ggdb -ggdb0 -ggdb1 -ggdb2 -ggdb3"
103     fi
104     # allow a bunch of flags that negate features / control ABI
105     ALLOWED_FLAGS="${ALLOWED_FLAGS} -fno-stack-protector -fno-stack-protector-all"
106     ALLOWED_FLAGS="${ALLOWED_FLAGS} -mregparm -mno-app-regs -mapp-regs \
107     -mno-mmx -mno-sse -mno-sse2 -mno-sse3 -mno-3dnow \
108     -mips1 -mips2 -mips3 -mips4 -mips32 -mips64 -mips16 \
109     -msoft-float -mno-soft-float -mhard-float -mno-hard-float -mfpu \
110     -mieee -mieee-with-inexact \
111     -mtls-direct-seg-refs -mno-tls-direct-seg-refs \
112     -mflat -mno-flat -mno-faster-structs -mfaster-structs \
113     -m32 -m64 -mabi -mlittle-endian -mbig-endian -EL -EB -fPIC \
114     -mlive-g0 -mcmodel -mstack-bias -mno-stack-bias"
115    
116     # C[XX]FLAGS that we are think is ok, but needs testing
117     # NOTE: currently -Os have issues with gcc3 and K6* arch's
118     export UNSTABLE_FLAGS="-Os -O3 -freorder-blocks -fprefetch-loop-arrays"
119     return 0
120     }
121    
122     filter-flags() {
123     local x f fset
124     declare -a new_CFLAGS new_CXXFLAGS
125    
126     for x in "$@" ; do
127     case "${x}" in
128     -fPIC|-fpic|-fPIE|-fpie|-pie)
129     append-flags `test_flag -fno-pie`;;
130     -fstack-protector|-fstack-protector-all)
131     fstack-flags;;
132     esac
133     done
134    
135     for fset in CFLAGS CXXFLAGS; do
136     # Looping over the flags instead of using a global
137     # substitution ensures that we're working with flag atoms.
138     # Otherwise globs like -O* have the potential to wipe out the
139     # list of flags.
140     for f in ${!fset}; do
141     for x in "$@"; do
142     # Note this should work with globs like -O*
143     [[ ${f} == ${x} ]] && continue 2
144     done
145     eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
146     done
147     eval export ${fset}=\${new_${fset}\[*]}
148     done
149    
150     return 0
151     }
152    
153     filter-lfs-flags() {
154     [[ -n $@ ]] && die "filter-lfs-flags takes no arguments"
155     filter-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
156     }
157    
158     append-lfs-flags() {
159     [[ -n $@ ]] && die "append-lfs-flags takes no arguments"
160     append-flags -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE
161     }
162    
163     append-flags() {
164     [[ -z $* ]] && return 0
165     export CFLAGS="${CFLAGS} $*"
166     export CXXFLAGS="${CXXFLAGS} $*"
167     [ -n "`is-flag -fno-stack-protector`" -o \
168     -n "`is-flag -fno-stack-protector-all`" ] && fstack-flags
169     return 0
170     }
171    
172     replace-flags() {
173     [[ $# != 2 ]] \
174     && echo && eerror "Usage: replace-flags <old flag> <new flag>" \
175     && die "replace-flags takes 2 arguments, not $#"
176    
177     local f fset
178     declare -a new_CFLAGS new_CXXFLAGS
179    
180     for fset in CFLAGS CXXFLAGS; do
181     # Looping over the flags instead of using a global
182     # substitution ensures that we're working with flag atoms.
183     # Otherwise globs like -O* have the potential to wipe out the
184     # list of flags.
185     for f in ${!fset}; do
186     # Note this should work with globs like -O*
187     [[ ${f} == ${1} ]] && f=${2}
188     eval new_${fset}\[\${\#new_${fset}\[@]}]=\${f}
189     done
190     eval export ${fset}=\${new_${fset}\[*]}
191     done
192    
193     return 0
194     }
195    
196     replace-cpu-flags() {
197     local newcpu="$#" ; newcpu="${!newcpu}"
198     while [ $# -gt 1 ] ; do
199     # quote to make sure that no globbing is done (particularly on
200     # ${oldcpu} prior to calling replace-flags
201     replace-flags "-march=${1}" "-march=${newcpu}"
202     replace-flags "-mcpu=${1}" "-mcpu=${newcpu}"
203     replace-flags "-mtune=${1}" "-mtune=${newcpu}"
204     shift
205 verwilst 1.1 done
206 chriswhite 1.1.1.1 return 0
207     }
208    
209     is-flag() {
210     local x
211 verwilst 1.1
212 chriswhite 1.1.1.1 for x in ${CFLAGS} ${CXXFLAGS} ; do
213     # Note this should work with globs like -mcpu=ultrasparc*
214     if [[ ${x} == ${1} ]]; then
215     echo true
216     return 0
217     fi
218     done
219     return 1
220 verwilst 1.1 }
221    
222 chriswhite 1.1.1.1 filter-mfpmath() {
223     local orig_mfpmath new_math prune_math
224 verwilst 1.1
225 chriswhite 1.1.1.1 # save the original -mfpmath flag
226     orig_mfpmath="`get-flag -mfpmath`"
227     # get the value of the current -mfpmath flag
228     new_math=" `get-flag mfpmath | tr , ' '` "
229     # figure out which math values are to be removed
230     prune_math=""
231     for prune_math in "$@" ; do
232     new_math="${new_math/ ${prune_math} / }"
233 verwilst 1.1 done
234 chriswhite 1.1.1.1 new_math="`echo ${new_math:1:${#new_math}-2} | tr ' ' ,`"
235    
236     if [ -z "${new_math}" ] ; then
237     # if we're removing all user specified math values are
238     # slated for removal, then we just filter the flag
239     filter-flags ${orig_mfpmath}
240     else
241     # if we only want to filter some of the user specified
242     # math values, then we replace the current flag
243     replace-flags ${orig_mfpmath} -mfpmath=${new_math}
244     fi
245     return 0
246     }
247    
248     strip-flags() {
249     local x y flag NEW_CFLAGS NEW_CXXFLAGS
250    
251     setup-allowed-flags
252    
253     local NEW_CFLAGS=""
254     local NEW_CXXFLAGS=""
255    
256     # Allow unstable C[XX]FLAGS if we are using unstable profile ...
257     if has ~$(tc-arch) ${ACCEPT_KEYWORDS} ; then
258     ALLOWED_FLAGS="${ALLOWED_FLAGS} ${UNSTABLE_FLAGS}"
259     fi
260    
261     set -f # disable pathname expansion
262    
263     for x in ${CFLAGS}; do
264     for y in ${ALLOWED_FLAGS}; do
265     flag=${x%%=*}
266     if [ "${flag%%${y}}" = "" ] ; then
267     NEW_CFLAGS="${NEW_CFLAGS} ${x}"
268     break
269     fi
270     done
271     done
272    
273     for x in ${CXXFLAGS}; do
274     for y in ${ALLOWED_FLAGS}; do
275     flag=${x%%=*}
276     if [ "${flag%%${y}}" = "" ] ; then
277     NEW_CXXFLAGS="${NEW_CXXFLAGS} ${x}"
278     break
279     fi
280     done
281     done
282    
283     # In case we filtered out all optimization flags fallback to -O2
284     if [ "${CFLAGS/-O}" != "${CFLAGS}" -a "${NEW_CFLAGS/-O}" = "${NEW_CFLAGS}" ]; then
285     NEW_CFLAGS="${NEW_CFLAGS} -O2"
286     fi
287     if [ "${CXXFLAGS/-O}" != "${CXXFLAGS}" -a "${NEW_CXXFLAGS/-O}" = "${NEW_CXXFLAGS}" ]; then
288     NEW_CXXFLAGS="${NEW_CXXFLAGS} -O2"
289     fi
290    
291     set +f # re-enable pathname expansion
292    
293     export CFLAGS="${NEW_CFLAGS}"
294     export CXXFLAGS="${NEW_CXXFLAGS}"
295     return 0
296     }
297    
298     test_flag() {
299     if $(tc-getCC) -S -xc "$@" -o "$(emktemp)" /dev/null &>/dev/null; then
300     printf "%s\n" "$*"
301     return 0
302     fi
303     return 1
304     }
305    
306     test_version_info() {
307     if [[ $($(tc-getCC) --version 2>&1) == *$1* ]]; then
308     return 0
309     else
310     return 1
311     fi
312     }
313    
314     strip-unsupported-flags() {
315     local x NEW_CFLAGS NEW_CXXFLAGS
316    
317     for x in ${CFLAGS} ; do
318     NEW_CFLAGS="${NEW_CFLAGS} $(test_flag ${x})"
319     done
320     for x in ${CXXFLAGS} ; do
321     NEW_CXXFLAGS="${NEW_CXXFLAGS} $(test_flag ${x})"
322     done
323    
324     export CFLAGS=${NEW_CFLAGS}
325     export CXXFLAGS=${NEW_CXXFLAGS}
326     }
327    
328     get-flag() {
329     local f findflag="$1"
330    
331     # this code looks a little flaky but seems to work for
332     # everything we want ...
333     # for example, if CFLAGS="-march=i686":
334     # `get-flag -march` == "-march=i686"
335     # `get-flag march` == "i686"
336     for f in ${CFLAGS} ${CXXFLAGS} ; do
337     if [ "${f/${findflag}}" != "${f}" ] ; then
338     printf "%s\n" "${f/-${findflag}=}"
339     return 0
340     fi
341     done
342     return 1
343     }
344    
345     # DEPRECATED - use gcc-specs-relro or gcc-specs-now from toolchain-funcs
346     has_hardened() {
347     test_version_info Hardened && return 0
348     # the specs file wont exist unless gcc has GCC_SPECS support
349     [ -f "${GCC_SPECS}" -a "${GCC_SPECS}" != "${GCC_SPECS/hardened/}" ] && \
350     return 0
351     return 1
352     }
353    
354     # DEPRECATED - use gcc-specs-pie from toolchain-funcs
355     # indicate whether PIC is set
356     has_pic() {
357     [ "${CFLAGS/-fPIC}" != "${CFLAGS}" ] && return 0
358     [ "${CFLAGS/-fpic}" != "${CFLAGS}" ] && return 0
359     [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
360     return 1
361     }
362    
363     # DEPRECATED - use gcc-specs-pie from toolchain-funcs
364     # indicate whether PIE is set
365     has_pie() {
366     [ "${CFLAGS/-fPIE}" != "${CFLAGS}" ] && return 0
367     [ "${CFLAGS/-fpie}" != "${CFLAGS}" ] && return 0
368     [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIE__)" ] && return 0
369     # test PIC while waiting for specs to be updated to generate __PIE__
370     [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __PIC__)" ] && return 0
371     return 1
372     }
373    
374     # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
375     # indicate whether code for SSP is being generated for all functions
376     has_ssp_all() {
377     # note; this matches only -fstack-protector-all
378     [ "${CFLAGS/-fstack-protector-all}" != "${CFLAGS}" ] && return 0
379     [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP_ALL__)" ] && return 0
380     gcc-specs-ssp && return 0
381     return 1
382     }
383    
384     # DEPRECATED - use gcc-specs-ssp from toolchain-funcs
385     # indicate whether code for SSP is being generated
386     has_ssp() {
387     # note; this matches both -fstack-protector and -fstack-protector-all
388     [ "${CFLAGS/-fstack-protector}" != "${CFLAGS}" ] && return 0
389     [ "$(echo | $(tc-getCC) ${CFLAGS} -E -dM - | grep __SSP__)" ] && return 0
390     gcc-specs-ssp && return 0
391     return 1
392     }
393    
394     has_m64() {
395     # this doesnt test if the flag is accepted, it tests if the flag
396     # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
397     # please dont replace this function with test_flag in some future
398     # clean-up!
399     local temp="$(emktemp)"
400     echo "int main() { return(0); }" > ${temp}.c
401     MY_CC=$(tc-getCC)
402     ${MY_CC/ .*/} -m64 -o "$(emktemp)" ${temp}.c > /dev/null 2>&1
403     local ret=$?
404     rm -f ${temp}.c
405     [ "$ret" != "1" ] && return 0
406     return 1
407     }
408    
409     has_m32() {
410     # this doesnt test if the flag is accepted, it tests if the flag
411     # actually -WORKS-. non-multilib gcc will take both -m32 and -m64!
412     # please dont replace this function with test_flag in some future
413     # clean-up!
414    
415     [ "$(tc-arch)" = "amd64" ] && has_multilib_profile && return 0
416    
417     local temp=$(emktemp)
418     echo "int main() { return(0); }" > "${temp}".c
419     MY_CC=$(tc-getCC)
420     ${MY_CC/ .*/} -m32 -o "$(emktemp)" "${temp}".c > /dev/null 2>&1
421     local ret=$?
422     rm -f "${temp}".c
423     [ "$ret" != "1" ] && return 0
424     return 1
425     }
426    
427     replace-sparc64-flags() {
428     local SPARC64_CPUS="ultrasparc v9"
429    
430     if [ "${CFLAGS/mtune}" != "${CFLAGS}" ]; then
431     for x in ${SPARC64_CPUS}; do
432     CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8}"
433     done
434     else
435     for x in ${SPARC64_CPUS}; do
436     CFLAGS="${CFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
437     done
438     fi
439    
440     if [ "${CXXFLAGS/mtune}" != "${CXXFLAGS}" ]; then
441     for x in ${SPARC64_CPUS}; do
442     CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8}"
443     done
444     else
445     for x in ${SPARC64_CPUS}; do
446     CXXFLAGS="${CXXFLAGS/-mcpu=${x}/-mcpu=v8 -mtune=${x}}"
447     done
448     fi
449    
450     export CFLAGS CXXFLAGS
451     }
452    
453     append-ldflags() {
454     export LDFLAGS="${LDFLAGS} $*"
455     return 0
456     }
457    
458     filter-ldflags() {
459     local x
460    
461     # we do this fancy spacing stuff so as to not filter
462     # out part of a flag ... we want flag atoms ! :D
463     LDFLAGS=" ${LDFLAGS} "
464     for x in "$@" ; do
465     LDFLAGS=${LDFLAGS// ${x} / }
466     done
467     [[ -z ${LDFLAGS// } ]] \
468     && LDFLAGS="" \
469     || LDFLAGS=${LDFLAGS:1:${#LDFLAGS}-2}
470     export LDFLAGS
471     return 0
472     }
473    
474     fstack-flags() {
475     if gcc-specs-ssp; then
476     [ -z "`is-flag -fno-stack-protector`" ] &&
477     export CFLAGS="${CFLAGS} `test_flag -fno-stack-protector`"
478     fi
479     return 0
480     }
481    
482     # This is thanks to great work from Paul de Vrieze <gentoo-user@devrieze.net>,
483     # bug #9016. Also thanks to Jukka Salmi <salmi@gmx.net> (bug #13907) for more
484     # fixes.
485     #
486     # Export CFLAGS and CXXFLAGS that are compadible with gcc-2.95.3
487     gcc2-flags() {
488     if [[ $(tc-arch) == "x86" || $(tc-arch) == "amd64" ]] ; then
489     CFLAGS=${CFLAGS//-mtune=/-mcpu=}
490     CXXFLAGS=${CXXFLAGS//-mtune=/-mcpu=}
491     fi
492    
493     replace-cpu-flags k6-{2,3} k6
494     replace-cpu-flags athlon{,-{tbird,4,xp,mp}} i686
495    
496     replace-cpu-flags pentium-mmx i586
497     replace-cpu-flags pentium{2,3,4} i686
498    
499     replace-cpu-flags ev6{7,8} ev6
500    
501     export CFLAGS CXXFLAGS
502     }
503 verwilst 1.1
504 chriswhite 1.1.1.1 # Gets the flags needed for "NOW" binding
505     bindnow-flags() {
506     case $($(tc-getLD) -v 2>&1 </dev/null) in
507     *GNU* | *'with BFD'*) # GNU ld
508     echo "-Wl,-z,now" ;;
509     *Apple*) # Darwin ld
510     echo "-bind_at_load" ;;
511     *)
512     # Some linkers just recognize -V instead of -v
513     case $($(tc-getLD) -V 2>&1 </dev/null) in
514     *Solaris*) # Solaris accept almost the same GNU options
515     echo "-Wl,-z,now" ;;
516     esac
517     ;;
518     esac
519 verwilst 1.1 }

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