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Re: Sun compiler and /usr/local/include

From: NightStrike
Subject: Re: Sun compiler and /usr/local/include
Date: Fri, 5 Mar 2010 16:25:20 -0500

On Fri, Mar 5, 2010 at 4:13 PM, Charles Brown <address@hidden> wrote:
> Dave Hart wrote:
>> On Fri, Mar 5, 2010 at 19:25 UTC, Charles Brown wrote:
>>  >
>>  > Very new to automake, and can't find an answer to this; What would be
>> put in
>>  > to determine whether the detected preprocessor/compiler
>>  > automatically supplies -I/usr/local/include (for example, g++ does, but
>> sun
>>  > CC does not), and if not, how to add it to some CFLAGS variable?
>> To expand on a point Ralf touched on, the typical Autoconf approach is
>> to predict as little as possible, and test for exactly what you need.
>> So I would ask you, when your package in built with Sun cc and fails
>> for lack of -I/usr/local/include, which header file in
>> /usr/local/include causes the break?  It should be in the compiler's
>> error message.  And I would suggest you then consider using a
>> test for that specific header file, assuming your code
>> #includes it, or for the header file your project #includes which
>> triggers the inclusion of the wrong/missing header.  That test would
>> then result in the addition of -I/usr/local/include on your Sun cc
>> configuration.  At the same time, you could easily expand it later if
>> another system has that header file in a different directory, by
>> searching a list of directories for the needed .h, rather than simply
>> /usr/local/include.
>> Instead of "my project needs -I/foo/include on system bar", I suggest
>> "my project needs to find the correct foo.h on all systems".
> If the file is; /usr/local/include/package/header.h
> and source is;  #include <package/header.h>
> what goes in
> AC_CHECK_HEADER([package/header.h]) just says 'no'.

Something like this would error out if the header isn't found:
AC_CHECK_HEADER([package/header.h],[],[AC_MSG_ERROR([header.h not
found but required])])

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