Don't emit U symbols in symbols files (#9528)

We only use them to know what libraries provide, and not what they require.

(For requirements, we let a library say "lib X depends on lib Y", so it doesn't
actually check undefs.)

Author: kripken

system/lib/symbols/asmjs/libal.symbols

@@ -1,102 +1,3 @@
 # Auto-generated by tools/update_symbols.py.  DO NOT EDIT.
-         U alBuffer3f
-         U alBuffer3i
-         U alBufferData
-         U alBufferf
-         U alBufferfv
-         U alBufferi
-         U alBufferiv
-         U alDeleteBuffers
-         U alDeleteSources
-         U alDisable
-         U alDistanceModel
-         U alDopplerFactor
-         U alDopplerVelocity
-         U alEnable
-         U alGenBuffers
-         U alGenSources
-         U alGetBoolean
-         U alGetBooleanv
-         U alGetBuffer3f
-         U alGetBuffer3i
-         U alGetBufferf
-         U alGetBufferfv
-         U alGetBufferi
-         U alGetBufferiv
-         U alGetDouble
-         U alGetDoublev
-         U alGetEnumValue
-         U alGetError
-         U alGetFloat
-         U alGetFloatv
-         U alGetInteger
-         U alGetIntegerv
-         U alGetListener3f
-         U alGetListener3i
-         U alGetListenerf
-         U alGetListenerfv
-         U alGetListeneri
-         U alGetListeneriv
-         U alGetProcAddress
-         U alGetSource3f
-         U alGetSource3i
-         U alGetSourcef
-         U alGetSourcefv
-         U alGetSourcei
-         U alGetSourceiv
-         U alGetString
-         U alIsBuffer
-         U alIsEnabled
-         U alIsExtensionPresent
-         U alIsSource
-         U alListener3f
-         U alListener3i
-         U alListenerf
-         U alListenerfv
-         U alListeneri
-         U alListeneriv
-         U alSource3f
-         U alSource3i
-         U alSourcePause
-         U alSourcePausev
-         U alSourcePlay
-         U alSourcePlayv
-         U alSourceQueueBuffers
-         U alSourceRewind
-         U alSourceRewindv
-         U alSourceStop
-         U alSourceStopv
-         U alSourceUnqueueBuffers
-         U alSourcef
-         U alSourcefv
-         U alSourcei
-         U alSourceiv
-         U alSpeedOfSound
-         U alcCaptureCloseDevice
-         U alcCaptureOpenDevice
-         U alcCaptureSamples
-         U alcCaptureStart
-         U alcCaptureStop
-         U alcCloseDevice
-         U alcCreateContext
-         U alcDestroyContext
-         U alcGetContextsDevice
-         U alcGetCurrentContext
-         U alcGetEnumValue
-         U alcGetError
-         U alcGetIntegerv
-         U alcGetProcAddress
-         U alcGetString
-         U alcIsExtensionPresent
-         U alcMakeContextCurrent
-         U alcOpenDevice
-         U alcProcessContext
-         U alcSuspendContext
 -------- T emscripten_GetAlProcAddress
 -------- T emscripten_GetAlcProcAddress
-         U emscripten_alcDevicePauseSOFT
-         U emscripten_alcDeviceResumeSOFT
-         U emscripten_alcGetStringiSOFT
-         U emscripten_alcResetDeviceSOFT
-         U emscripten_asm_const_int
-         U strcmp

system/lib/symbols/asmjs/libc++-mt-noexcept.symbols

@@ -1,10 +1,8 @@
 # Auto-generated by tools/update_symbols.py.  DO NOT EDIT.
-         U _ZNKSt11logic_error4whatEv
 -------- T _ZNKSt12bad_any_cast4whatEv
 -------- T _ZNKSt12experimental15fundamentals_v112bad_any_cast4whatEv
 -------- W _ZNKSt12experimental15fundamentals_v13pmr26__null_memory_resource_imp11do_is_equalERKNS1_15memory_resourceE
 -------- W _ZNKSt12experimental15fundamentals_v13pmr32__new_delete_memory_resource_imp11do_is_equalERKNS1_15memory_resourceE
-         U _ZNKSt13runtime_error4whatEv
 -------- T _ZNKSt16nested_exception14rethrow_nestedEv
 -------- T _ZNKSt18bad_variant_access4whatEv
 -------- T _ZNKSt19bad_optional_access4whatEv
@@ -772,7 +770,6 @@
 -------- T _ZNSt11logic_errorC2EPKc
 -------- T _ZNSt11logic_errorC2ERKNSt3__212basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEE
 -------- T _ZNSt11logic_errorC2ERKS_
-         U _ZNSt11logic_errorD2Ev
 -------- T _ZNSt11logic_erroraSERKS_
 -------- W _ZNSt12bad_any_castD0Ev
 -------- W _ZNSt12experimental15fundamentals_v112bad_any_castD0Ev
@@ -805,7 +802,6 @@
 -------- T _ZNSt13runtime_errorC2EPKc
 -------- T _ZNSt13runtime_errorC2ERKNSt3__212basic_stringIcNS0_11char_traitsIcEENS0_9allocatorIcEEEE
 -------- T _ZNSt13runtime_errorC2ERKS_
-         U _ZNSt13runtime_errorD2Ev
 -------- T _ZNSt13runtime_erroraSERKS_
 -------- T _ZNSt16nested_exceptionC1Ev
 -------- T _ZNSt16nested_exceptionC2Ev
@@ -2713,16 +2709,12 @@
 -------- T _ZNSt3__29to_stringEx
 -------- T _ZNSt3__29to_stringEy
 -------- W _ZNSt3__2plIcNS_11char_traitsIcEENS_9allocatorIcEEEENS_12basic_stringIT_T0_T1_EEPKS6_RKS9_
-         U _ZNSt8bad_castD2Ev
-         U _ZNSt9exceptionD2Ev
-         U _ZSt15get_new_handlerv
 -------- T _ZSt17__throw_bad_allocv
 -------- T _ZSt17current_exceptionv
 -------- T _ZSt17rethrow_exceptionSt13exception_ptr
 -------- T _ZSt18uncaught_exceptionv
 -------- T _ZSt19uncaught_exceptionsv
 -------- D _ZSt7nothrow
-         U _ZSt9terminatev
 -------- D _ZTCNSt3__210istrstreamE0_NS_13basic_istreamIcNS_11char_traitsIcEEEE
 -------- D _ZTCNSt3__210ostrstreamE0_NS_13basic_ostreamIcNS_11char_traitsIcEEEE
 -------- W _ZTCNSt3__214basic_ifstreamIcNS_11char_traitsIcEEEE0_NS_13basic_istreamIcS2_EE
@@ -2867,14 +2859,10 @@
 -------- W _ZTINSt3__29money_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE
 -------- D _ZTINSt3__29strstreamE
 -------- W _ZTINSt3__29time_baseE
-         U _ZTISt11logic_error
 -------- D _ZTISt12bad_any_cast
-         U _ZTISt13runtime_error
 -------- D _ZTISt16nested_exception
 -------- D _ZTISt18bad_variant_access
 -------- D _ZTISt19bad_optional_access
-         U _ZTISt8bad_cast
-         U _ZTISt9exception
 -------- D _ZTSNSt12experimental15fundamentals_v112bad_any_castE
 -------- W _ZTSNSt12experimental15fundamentals_v13pmr15memory_resourceE
 -------- W _ZTSNSt12experimental15fundamentals_v13pmr26__null_memory_resource_impE
@@ -3024,9 +3012,6 @@
 -------- W _ZTTNSt3__214basic_iostreamIcNS_11char_traitsIcEEEE
 -------- W _ZTTNSt3__214basic_ofstreamIcNS_11char_traitsIcEEEE
 -------- D _ZTTNSt3__29strstreamE
-         U _ZTVN10__cxxabiv117__class_type_infoE
-         U _ZTVN10__cxxabiv120__si_class_type_infoE
-         U _ZTVN10__cxxabiv121__vmi_class_type_infoE
 -------- D _ZTVNSt12experimental15fundamentals_v112bad_any_castE
 -------- W _ZTVNSt12experimental15fundamentals_v13pmr15memory_resourceE
 -------- W _ZTVNSt12experimental15fundamentals_v13pmr26__null_memory_resource_impE
@@ -3143,9 +3128,7 @@
 -------- W _ZTVNSt3__29money_putIcNS_19ostreambuf_iteratorIcNS_11char_traitsIcEEEEEE
 -------- W _ZTVNSt3__29money_putIwNS_19ostreambuf_iteratorIwNS_11char_traitsIwEEEEEE
 -------- D _ZTVNSt3__29strstreamE
-         U _ZTVSt11logic_error
 -------- D _ZTVSt12bad_any_cast
-         U _ZTVSt13runtime_error
 -------- D _ZTVSt16nested_exception
 -------- D _ZTVSt18bad_variant_access
 -------- D _ZTVSt19bad_optional_access
@@ -3208,161 +3191,3 @@
 -------- W _ZnwmRKSt9nothrow_t
 -------- W _ZnwmSt11align_val_t
 -------- W _ZnwmSt11align_val_tRKSt9nothrow_t
-         U __ctype_b_loc
-         U __ctype_get_mb_cur_max
-         U __ctype_tolower_loc
-         U __ctype_toupper_loc
-         U __cxa_atexit
-         U __cxa_current_primary_exception
-         U __cxa_decrement_exception_refcount
-         U __cxa_guard_acquire
-         U __cxa_guard_release
-         U __cxa_increment_exception_refcount
-         U __cxa_pure_virtual
-         U __cxa_rethrow_primary_exception
-         U __cxa_uncaught_exceptions
-         U __dso_handle
-         U __errno_location
-         U abort
-         U btowc
-         U calloc
-         U catclose
-         U catgets
-         U catopen
-         U chdir
-         U clock_gettime
-         U close
-         U closedir
-         U fchmod
-         U fchmodat
-         U fclose
-         U fdopen
-         U fflush
-         U fprintf
-         U fread
-         U free
-         U freelocale
-         U fseeko
-         U fstat
-         U ftello
-         U ftruncate
-         U fwrite
-         U getc
-         U getcwd
-         U getenv
-         U isdigit_l
-         U iswalpha_l
-         U iswblank_l
-         U iswcntrl_l
-         U iswdigit_l
-         U iswlower_l
-         U iswprint_l
-         U iswpunct_l
-         U iswspace_l
-         U iswupper_l
-         U iswxdigit_l
-         U isxdigit_l
-         U link
-         U localeconv
-         U lstat
-         U malloc
-         U mbrlen
-         U mbrtowc
-         U mbsnrtowcs
-         U mbsrtowcs
-         U mbtowc
-         U memchr
-         U memcmp
-         U mkdir
-         U nanosleep
-         U newlocale
-         U open
-         U opendir
-         U pathconf
-         U posix_memalign
-         U pthread_cond_broadcast
-         U pthread_cond_destroy
-         U pthread_cond_signal
-         U pthread_cond_timedwait
-         U pthread_cond_wait
-         U pthread_detach
-         U pthread_equal
-         U pthread_getspecific
-         U pthread_join
-         U pthread_key_create
-         U pthread_mutex_destroy
-         U pthread_mutex_init
-         U pthread_mutex_lock
-         U pthread_mutex_trylock
-         U pthread_mutex_unlock
-         U pthread_mutexattr_destroy
-         U pthread_mutexattr_init
-         U pthread_mutexattr_settype
-         U pthread_self
-         U pthread_setspecific
-         U read
-         U readdir
-         U readlink
-         U realloc
-         U realpath
-         U remove
-         U rename
-         U sched_yield
-         U setlocale
-         U snprintf
-         U sscanf
-         U stat
-         U statvfs
-         U stderr
-         U stdin
-         U stdout
-         U strcmp
-         U strcoll_l
-         U strerror_r
-         U strftime_l
-         U strlen
-         U strtod
-         U strtod_l
-         U strtof
-         U strtof_l
-         U strtol
-         U strtold
-         U strtold_l
-         U strtoll
-         U strtoll_l
-         U strtoul
-         U strtoull
-         U strtoull_l
-         U strxfrm_l
-         U swprintf
-         U symlink
-         U sysconf
-         U tolower_l
-         U toupper_l
-         U towlower_l
-         U towupper_l
-         U truncate
-         U ungetc
-         U uselocale
-         U utimensat
-         U vasprintf
-         U vsnprintf
-         U vsscanf
-         U wcrtomb
-         U wcscoll_l
-         U wcslen
-         U wcsnrtombs
-         U wcstod
-         U wcstof
-         U wcstol
-         U wcstold
-         U wcstoll
-         U wcstoul
-         U wcstoull
-         U wcsxfrm_l
-         U wctob
-         U wmemchr
-         U wmemcmp
-         U wmemcpy
-         U wmemmove
-         U wmemset