Warning Prebinding Disabled Because Dependent Library

Building a dynamic library with prebinding enabled eliminates thenormal bin=
ding overhead by predefining the library at a specifiedaddress range. When =
an executable or other dynamic library is builtagainst a prebound library, =
the linker can directly reference symbolsin the prebound library by address=
, instead of leaving the addressesundefined.

The static linker also records the time stamp of librariesdependent librari=
es. When the program is executed, the dynamic linkerchecks to see that all =
the build time stamps match and that theprebound address ranges of all code=
 does not overlap. If both ofthese conditions are met, the binding of undef=
ined references isalready done, which saves a considerable amount of time. =
If the timestamps don't match, or prebound executable addresses overlap, th=
eprebinding is undone and the program is bound normally.

warning prebinding disabled because dependent library
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You do not need to relink every time the prebinding of a librarymight chang=
e. You can use the redo_prebinding(1) tool andthe update_prebinding(1) tool=
 to update prebindings.However, in order to use these tools, you need to li=
nk againstlibraries that were initially prebound. If a library was not preb=
oundwhen it was originally linked against, redo_prebinding(1)cannot prebind=
 it. It must be initially built as a prebound library,as specified above.

If prebinding fails you will see a warning message in the buildlog. Prebind=
ing has a number of requirements to allow it to work(see above). If any of =
these requirementsaren't met prebinding will disabled and a warning message=
 will beprinted by the static linker when building.

/usr/bin/ld: warning prebinding disabled because of symbolsoverridden in de=
pendent dynamic shared libraries:
/BinCache1/objc4/Objects/objc4-133.obj2/objects-optimized/objcopt.tproj/obj=
copt.odefinition of _swap_mach_header in section (__TEXT,__text)
/System/Library/Frameworks/System.framework/System(swap.o) definitionof _sw=
ap_mach_header

ld: warning prebinding disabled because of symbols overriddenin dependent d=
ynamic shared libraries:
/BinCache1/PBDevKit/Objects/PBDevKit-378.1.obj2/objects-optimized/DevKit/Lo=
wlevel.subproj_subproj.odefinition of _regcomp in section (__TEXT,__text)
/System/Library/Frameworks/System.framework/System(regcomp.o)definition of =
_regcomp

This happened because when cc(1) was built the Systemframework it was built=
 against was not prebound. dyld(1) canfail trying to use prebound libraries=
 if the program overridessymbols defined in it's dependent libraries that a=
re used by adependent library. For example:



Currently dyld(1) only tries to use the preboundlibraries if the program us=
es only one prebound library. This isbecause with flat namespace libraries =
the checking needed to makesure all the libraries don't override any of eac=
h other symbols ismore time consuming than the optimization would generally=
 save.

The program will run correctly but the prebinding optimizationwill be undon=
e and the program dynamically bound as usual. Releasesfrom Apple should nev=
er be in this state. However, if you change aframework on your system you c=
an update the dependent programs (orframeworks) without rebuilding them by =
runningredo_prebinding(1) on them. For example, using the caseabove:

To force the prebinding to be out of date one can runstrip(1) or nmedit(1) =
on one of the dependentlibraries to cause the built time stamp to be change=
d. A common wayto do this and not effect the symbols contained in the libra=
ry is torun strip(1) with the -X option as all the localsymbols starting wi=
th 'L' are already stripped by theassembler by default.

Since prebinding requires that the entire set of libraries beinitialized wh=
en loaded, libraries may be initialized in a differentorder than they would=
 without prebinding. This can uncover latentproblems in the order of librar=
y initializations that went undetectedwithout prebinding, particularly if t=
here were library initializationroutines which did not explicitly call the =
initialization routinesfor libraries on which they depend. As a result, une=
xpected problemscan occur when prebinding is enabled.

Dependency injection containers introduce additional performance constraint=
s into mobile applications. Registering and resolving types with a containe=
r has a performance cost because of the container's use of reflection for c=
reating each type, especially if dependencies are being reconstructed for e=
ach page navigation in the app. If there are many or deep dependencies, the=
 cost of creation can increase significantly. In addition, type registratio=
n, which usually occurs during application startup, can have a noticeable i=
mpact on startup time, dependent upon the container being used.

Overall OptionsSee section Options Controlling the Kind of Output. -c -S -E=
 -o file-x language -v -### --help --target-help --versionC Language Option=
sSee section Options Controlling C Dialect. -ansi -std=3Dstandard-fno-asm -=
fno-builtin -fno-builtin-function -fhosted -ffreestanding -fms-extensions -=
trigraphs -no-integrated-cpp -traditional -traditional-cpp -fallow-single-p=
recision -fcond-mismatch -fsigned-bitfields -fsigned-char -funsigned-bitfie=
lds -funsigned-char -fwritable-stringsC++ Language OptionsSee section Optio=
ns Controlling C++ Dialect. -fabi-version=3Dn-fconserve-space -fno-const-st=
rings -fno-elide-constructors -fno-enforce-eh-specs -ffor-scope -fno-for-sc=
ope -fno-gnu-keywords -fno-implicit-templates -fno-implicit-inline-template=
s -fno-implement-inlines -fms-extensions -fno-nonansi-builtins -fno-operato=
r-names -fno-optional-diags -fpermissive -frepo -fno-rtti -fstats -ftemplat=
e-depth-n -fuse-cxa-atexit -fno-weak -nostdinc++ -fno-default-inline -Wabi =
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Wno-non-template-friend -Wold-style-cast -Woverloaded-virtual -Wno-pmf-conv=
ersions -Wsign-promoObjective-C Language OptionsSee section Options Control=
ling Objective-C Dialect. -fconstant-string-class=3Dclass-name -fgnu-runtim=
e -fnext-runtime -fno-nil-receivers -fobjc-exceptions -freplace-objc-classe=
s -fzero-link -gen-decls -Wno-protocol -Wselector -Wundeclared-selectorLang=
uage Independent OptionsSee section Options to Control Diagnostic Messages =
Formatting. -fmessage-length=3Dn-fdiagnostics-show-location=3D[onceevery-li=
ne]Warning OptionsSee section Options to Request or Suppress Warnings. -fsy=
ntax-only -pedantic -pedantic-errors -w -Wextra -Wall -Waggregate-return -W=
cast-align -Wcast-qual -Wchar-subscripts -Wcomment -Wconversion -Wno-deprec=
ated-declarations -Wdisabled-optimization -Wno-div-by-zero -Wendif-labels -=
Werror -Werror-implicit-function-declaration -Wfloat-equal -Wformat -Wforma=
t=3D2 -Wno-format-extra-args -Wformat-nonliteral -Wformat-security -Wformat=
-y2k -Wimplicit -Wimplicit-function-declaration -Wimplicit-int -Wimport -Wn=
o-import -Winit-self -Winline -Wno-invalid-offsetof -Winvalid-pch -Wlarger-=
than-len -Wlong-long -Wmain -Wmissing-braces -Wmissing-format-attribute -Wm=
issing-noreturn -Wno-multichar -Wnonnull -Wpacked -Wpadded -Wparentheses -W=
pointer-arith -Wredundant-decls -Wreturn-type -Wsequence-point -Wshadow -Ws=
ign-compare -Wstrict-aliasing -Wswitch -Wswitch-default -Wswitch-enum -Wsys=
tem-headers -Wtrigraphs -Wundef -Wuninitialized -Wunknown-pragmas -Wunreach=
able-code -Wunused -Wunused-function -Wunused-label -Wunused-parameter -Wun=
used-value -Wunused-variable -Wwrite-stringsC-only Warning Options -Wbad-fu=
nction-cast -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -W=
old-style-definition -Wstrict-prototypes -Wtraditional -Wdeclaration-after-=
statementDebugging OptionsSee section Options for Debugging Your Program or=
 GCC. -dletters-fdump-unnumbered -fdump-translation-unit[-n] -fdump-class-h=
ierarchy[-n] -fdump-tree-original[-n] -fdump-tree-optimized[-n] -fdump-tree=
-inlined[-n] -fcallgraph-info -feliminate-dwarf2-dups -feliminate-unused-de=
bug-types -feliminate-unused-debug-symbols -fmem-report -fprofile-arcs -fra=
ndom-seed=3Dstring -fsched-verbose=3Dn -fstack-usage -ftest-coverage -ftime=
-report -g -glevel -gcoff -gdwarf-2 -ggdb -gstabs -gstabs+ -gvms -gxcoff -g=
xcoff+ -p -pg -print-file-name=3Dlibrary -print-libgcc-file-name -print-mul=
ti-directory -print-multi-lib -print-prog-name=3Dprogram -print-search-dirs=
 -Q -save-temps -timeOptimization OptionsSee section Options that Control O=
ptimization. -falign-functions=3Dn-falign-labels=3Dn -falign-loops=3Dn -fbr=
anch-probabilities -fprofile-values -fvpt -fbranch-target-load-optimize -fb=
ranch-target-load-optimize2 -fcaller-saves -fcprop-registers -fcse-follow-j=
umps -fcse-skip-blocks -fdata-sections -fdelayed-branch -fdelete-null-point=
er-checks -fexpensive-optimizations -ffast-math -ffloat-store -fforce-addr =
-fforce-mem -ffunction-sections -fgcse -fgcse-lm -fgcse-sm -fgcse-las -floo=
p-optimize -fcrossjumping -fif-conversion -fif-conversion2 -finline-functio=
ns -finline-limit=3Dn -fkeep-inline-functions -fkeep-static-consts -fmerge-=
constants -fmerge-all-constants -fmove-all-movables -fnew-ra -fno-branch-co=
unt-reg -fno-default-inline -fno-defer-pop -fno-function-cse -fno-guess-bra=
nch-probability -fno-inline -fno-math-errno -fno-peephole -fno-peephole2 -f=
unsafe-math-optimizations -ffinite-math-only -fno-trapping-math -fno-zero-i=
nitialized-in-bss -fomit-frame-pointer -foptimize-register-move -foptimize-=
sibling-calls -fprefetch-loop-arrays -fprofile-generate -fprofile-use -fred=
uce-all-givs -fregmove -frename-registers -freorder-blocks -freorder-functi=
ons -frerun-cse-after-loop -frerun-loop-opt -frounding-math -fschedule-insn=
s -fschedule-insns2 -fno-sched-interblock -fno-sched-spec -fsched-spec-load=
 -fsched-spec-load-dangerous -fsched-stalled-insns=3Dn -sched-stalled-insns=
-dep=3Dn -fsched2-use-superblocks -fsched2-use-traces -fsignaling-nans -fsi=
ngle-precision-constant -fstrength-reduce -fstrict-aliasing -ftracer -fthre=
ad-jumps -funroll-all-loops -funroll-loops -fpeel-loops -funswitch-loops -f=
old-unroll-loops -fold-unroll-all-loops --param name=3Dvalue-O -O0 -O1 -O2 =
-O3 -OsPreprocessor OptionsSee section Options Controlling the Preprocessor=
. -Aquestion-A-question[=3Danswer] -C -dD -dI -dM -dN -Dmacro[=3Ddefn] -E -=
H -idirafter dir -include file -imacros file -iprefix file -iwithprefix dir=
 -iwithprefixbefore dir -isystem dir -M -MM -MF -MG -MP -MQ -MT -nostdinc -=
P -fworking-directory -remap -trigraphs -undef -Umacro -Wp,option -Xpreproc=
essor optionAssembler OptionSee section Passing Options to the Assembler. -=
Wa,optionLinker OptionsSee section Options for Linking. object-file-name-no=
startfiles -nodefaultlibs -nostdlib -pie -s -static -static-libgcc -shared =
-shared-libgcc -symbolic -Wl,option -Xlinker option -u symbolDirectory Opti=
onsSee section Options for Directory Search. -BprefixTarget OptionsSee sect=
ion 3.16 Specifying Target Machine and Compiler Version. -V versionMachine =
Dependent OptionsSee section Hardware Models and Configurations.M680x0 Opti=
ons {-m68000 -m68020 -m68020-40 -m68020-60 -m68030 -m68040 -m68060 -mcpu32 =
-m5200 -m68881 -mbitfield -mc68000 -mc68020 -mnobitfield -mrtd -mshort -mso=
ft-float -mpcrel -malign-int -mstrict-align -msep-data -mno-sep-data -mshar=
ed-library-id=3Dn -mid-shared-library -mno-id-shared-library
 eebf2c3492