[lmi] Cross-linking issues [Was: Cross-compiling lmi from Linux to MSW]

[Greg Chicares]

On 2016-01-21 01:52, Greg Chicares wrote:
> On 2016-01-14 01:35, Vadim Zeitlin wrote:
[...]
>> Second, we need to
>> add the "force linking" stuff to alert_wx.cpp and main_wx.cpp to ensure
>> that the alert function pointers are set correctly in lmi_wx.exe as
>> otherwise they were not, resulting in an error message and abort, for the
>> same reason as in the MSVS build: alert_wx object file was simply omitted
>> entirely by the linker.
> 
> Committed (with additions) 20160121T0032Z,  revision 6486.

More work is required. The issue is not confined to wx-dependent code.
I copied a cross-compiled 'elapsed_time.exe' into native msw-xp,
verified that its dependencies are minimal:

/cygdrive/c/downloads[0]$cygcheck ./elapsed_time.exe
C:\downloads\elapsed_time.exe
  C:\WINDOWS\system32\KERNEL32.dll
    C:\WINDOWS\system32\ntdll.dll
  C:\WINDOWS\system32\msvcrt.dll
  C:\WINDOWS\system32\USER32.dll
    C:\WINDOWS\system32\GDI32.dll
  C:\opt\lmi\local\bin\libgcc_s_sjlj-1.dll
  C:\opt\lmi\local\bin\libstdc++-6.dll

and ran it:

/cygdrive/c/downloads[0]$./elapsed_time.exe xyzzy
zsh: segmentation fault  ./elapsed_time.exe xyzzy

Messagebox:
  Catastrophic error
  Not all alert function pointers have been set.

It seems to work correctly with valid arguments:

/cygdrive/c/downloads[0]$./elapsed_time.exe ls elapsed_time.exe
elapsed_time.exe
Elapsed time: 77 milliseconds

/cygdrive/c/downloads[0]$./elapsed_time.exe pwd
/cygdrive/c/downloads
Elapsed time: 99 milliseconds

And it gives the intended diagnostic with zero arguments:

/cygdrive/c/downloads[0]$./elapsed_time.exe
elapsed_time: at least one argument required.

because that message is reported directly on stderr, without going
through the 'alert' facility.