[Qemu-devel] [Bug 1596009] [NEW] config/build problem due to libncursesw on Xenial

[Alexander Stohr]

Public bug reported:

it happened to me during a build of yocto/bitbake related cross tools.
the auto-configuration part titled "SDL probe" for qemu-2.2.0 i found
the configuration step failing for the compile_prog routine. actually
those test compile went fine but only the test linking failed.

this was due a reference of the sub-sub-...-included libcaca referenced
an initially not installed (hint: check for and report such pre-
requisites upfront - might be yocto related) and later on installed by
me component of name libncursesw seemingly in its dev variant (i was
installing libncursesw5-dev_6.0+20160213-1ubuntu1_amd64.deb). tests on
the command line showed that adding the required paths and resources
made the test application link nicely.

a quick hack attempt for the config script resulted in those line:
  sdl_libs="$sdl_libs -L/lib/x86_64-linux-gnu -lncursesw"
this allowed me to pass the configuration check nicely.
i am just seeing my full scale compile fail for the same reason multiple times 
for linking. that all should be fixable the same way.

you might or might not have addressed this in newer versions of your
package. but you probably know that setups for embedded targets will
sometimes lack behind in their evolution until a sudden (well prepared)
some big jump in versions does happen. so i leave the hint here for your
reference - for the main reason of this very often spotted message -
raised by several main reasons according to public web reports, but not
this one until right here and now:

| ERROR: User requested feature sdl
|        configure was not able to find it.
|        Install SDL devel

By the way these lines already have to locations in the configure script
where the first indicates that pkg/sdl/sdl2-config application is not there 
(=no SDL devel there)
whilst the second indicates that *-config is there but the test compile failed 
(=devel is broken for some other reason).
This could/should see some improvement as well as this is the first hint on 
what went wrong - and in the second case you definitely can give the user the 
quite valueable hint for the log file with the results of the test compile.

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: configure libcaca libncursesw sdl

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https://bugs.launchpad.net/bugs/1596009

Title:
  config/build problem due to libncursesw on Xenial

Status in QEMU:
  New

Bug description:
  it happened to me during a build of yocto/bitbake related cross tools.
  the auto-configuration part titled "SDL probe" for qemu-2.2.0 i found
  the configuration step failing for the compile_prog routine. actually
  those test compile went fine but only the test linking failed.

  this was due a reference of the sub-sub-...-included libcaca
  referenced an initially not installed (hint: check for and report such
  pre-requisites upfront - might be yocto related) and later on
  installed by me component of name libncursesw seemingly in its dev
  variant (i was installing
  libncursesw5-dev_6.0+20160213-1ubuntu1_amd64.deb). tests on the
  command line showed that adding the required paths and resources made
  the test application link nicely.

  a quick hack attempt for the config script resulted in those line:
    sdl_libs="$sdl_libs -L/lib/x86_64-linux-gnu -lncursesw"
  this allowed me to pass the configuration check nicely.
  i am just seeing my full scale compile fail for the same reason multiple 
times for linking. that all should be fixable the same way.

  you might or might not have addressed this in newer versions of your
  package. but you probably know that setups for embedded targets will
  sometimes lack behind in their evolution until a sudden (well
  prepared) some big jump in versions does happen. so i leave the hint
  here for your reference - for the main reason of this very often
  spotted message - raised by several main reasons according to public
  web reports, but not this one until right here and now:

  | ERROR: User requested feature sdl
  |        configure was not able to find it.
  |        Install SDL devel

  By the way these lines already have to locations in the configure script
  where the first indicates that pkg/sdl/sdl2-config application is not there 
(=no SDL devel there)
  whilst the second indicates that *-config is there but the test compile 
failed (=devel is broken for some other reason).
  This could/should see some improvement as well as this is the first hint on 
what went wrong - and in the second case you definitely can give the user the 
quite valueable hint for the log file with the results of the test compile.

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