Re: [Xen-devel] [PATCH 2/2] configure: check for argp

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

On 06/22/2015 11:45 AM, Wei Liu wrote:
> On Mon, Jun 22, 2015 at 11:12:27AM +0100, George Dunlap wrote:
>> On 06/19/2015 09:58 AM, Roger Pau Monne wrote:
>>> argp is only present in the GNU C library, so add a specific check for it in
>>> configure. Also check if -largp is needed for linking against it.
>>>
>>> Please run autoconf after applying.
>>>
>>> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>>> Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
>>> Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
>>> Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
>>> Cc: Wei Liu <wei.liu2@xxxxxxxxxx>
>>> Cc: Olaf Hering <olaf@xxxxxxxxx>
>>> ---
>>>  config/Tools.mk.in      | 1 +
>>>  tools/configure.ac      | 4 ++++
>>>  tools/xentrace/Makefile | 2 +-
>>>  3 files changed, 6 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/config/Tools.mk.in b/config/Tools.mk.in
>>> index aef9ed6..9bd5f6c 100644
>>> --- a/config/Tools.mk.in
>>> +++ b/config/Tools.mk.in
>>> @@ -78,5 +78,6 @@ CONFIG_GCRYPT       := @libgcrypt@
>>>  EXTFS_LIBS          := @EXTFS_LIBS@
>>>  CURSES_LIBS         := @CURSES_LIBS@
>>>  TINFO_LIBS          := @TINFO_LIBS@
>>> +ARGP_LDFLAGS        := @argp_ldflags@
>>>  
>>>  FILE_OFFSET_BITS    := @FILE_OFFSET_BITS@
>>> diff --git a/tools/configure.ac b/tools/configure.ac
>>> index 1a06ddf..5eb4799 100644
>>> --- a/tools/configure.ac
>>> +++ b/tools/configure.ac
>>> @@ -356,6 +356,10 @@ AC_CHECK_LIB([yajl], [yajl_alloc], [],
>>>  AC_CHECK_LIB([z], [deflateCopy], [], [AC_MSG_ERROR([Could not find zlib])])
>>>  AC_CHECK_LIB([iconv], [libiconv_open], [libiconv="y"], [libiconv="n"])
>>>  AC_SUBST(libiconv)
>>> +AC_CHECK_HEADER([argp.h], [
>>> +AC_CHECK_LIB([argp], [argp_usage], [argp_ldflags="-largp"])
>>> +], [AC_MSG_ERROR([Could not find argp])])
>>> +AC_SUBST(argp_ldflags)
>>
>> Sorry if my config-fu isn't very good:  Is this basically requiring the
>> user to have argp available at configure time?  Does this make it more
>> difficult to build on BSDs?  Or is it just a matter of adding one more
>> library to the already long list of dependencies?
> 
> This is just to make that dependency explicit. This is a step towards
> the right direction.  It's not going to make it easier or harder to
> build on BSDs.

Well the reason I was asking is that if it would be a big hassle for
someone building on BSDs to install the argp library, then a better
option might to just not build xenalyze.

On the other hand, if it's no more difficult than installing libyajl (or
any of the other dozen dependencies), then adding a dependency is fine.
 And naturally in that case making the dependency explicit is the right
thing to do.

 -George



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