[MacPorts] #71680: gnuregex fails on powerpc: symbol dyld_stub_binding_helper not defined for architecture ppc

[MacPorts]

#71680: gnuregex fails on powerpc: symbol dyld_stub_binding_helper not defined for
architecture ppc
---------------------------+--------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.10.5
Resolution:                |   Keywords:
      Port:  gnuregex      |
---------------------------+--------------------

Comment (by barracuda156):

 Replying to [comment:2 kencu]:
 > that symbol is supposed to be found in libSystem, and it is there:
 >
 > {{{
 > LeopardG5:regex-0.12 $ nm -a -arch ppc /usr/lib/libSystem.dylib | grep
 dyld_stub_binding_helper
 > 000b25c4 t dyld_stub_binding_helper
 > }}}

 Some docs expect it in other libs:
 {{{
 Assembly-language glue code that performs binding for a lazy function
 symbol.

 .private_extern dyld_stub_binding_helper

 Parameter Descriptions
 PowerPC: r11 x86: stack-based parameter
     A pointer to the lazy symbol pointer for the function to be bound.

 Discussion

 The dyld stub binding helper is a glue function that assists the dynamic
 linker in lazily binding an external function. When the compiler sees a
 call to an external function,
 it generates a symbol stub and a lazy pointer for the function. At the
 call site, the compiler generates a call to the symbol stub. The symbol
 stub is a sequence of code
 that loads the lazy pointer and jumps to it. Initially, the sequence of
 code and the contents of the lazy pointer call dyld_stub_binding_helper,
 which calls the dynamic linker
  to bind the symbol. After the symbol is bound, the lazy pointer is set to
 the address of the symbol, and the symbol is reached directly by jumping
 to the lazy pointer.

 Thereafter, because the address has been changed to the actual address of
 the function, all calls to the external function call the external
 function.

 On entry, dyld_stub_binding_helper accepts the address of the lazy symbol
 pointer. On exit, the value of the lazy symbol pointer is set to the
 address of the external function.
 The dyld stub binding helper is assembly-language based and does not use
 standard calling conventions, and as such, the location of the parameters
 are specific to each CPU
 architecture. On PowerPC, the address of the lazy symbol pointer is
 expected to be in GPR11. On x86, the address of the lazy symbol pointer
 should be the pushed on the stack.

 dyld_stub_binding_helper is located in the runtime startup files that are
 statically linked into the image. For executables, the file is
 /lib/crt1.o. For bundles, it is /lib/bundle1.o,
 and for shared libraries, it is /lib/dylib1.o.
 }}}
 Apple docs quoted in:
 https://github.com/avast/retdec/issues/165#issuecomment-363519465

-- 
Ticket URL: <https://trac.macports.org/ticket/71680#comment:14>
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