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5a053ffe80
This commit renames lib/setup.h to lib/curl_setup.h and
renames lib/setup_once.h to lib/curl_setup_once.h.
Removes the need and usage of a header inclusion guard foreign
to libcurl. [1]
Removes the need and presence of an alarming notice we carried
in old setup_once.h [2]
----------------------------------------
1 - lib/setup_once.h used __SETUP_ONCE_H macro as header inclusion guard
up to commit ec691ca3 which changed this to HEADER_CURL_SETUP_ONCE_H,
this single inclusion guard is enough to ensure that inclusion of
lib/setup_once.h done from lib/setup.h is only done once.
Additionally lib/setup.h has always used __SETUP_ONCE_H macro to
protect inclusion of setup_once.h even after commit ec691ca3, this
was to avoid a circular header inclusion triggered when building a
c-ares enabled version with c-ares sources available which also has
a setup_once.h header. Commit ec691ca3 exposes the real nature of
__SETUP_ONCE_H usage in lib/setup.h, it is a header inclusion guard
foreign to libcurl belonging to c-ares's setup_once.h
The renaming this commit does, fixes the circular header inclusion,
and as such removes the need and usage of a header inclusion guard
foreign to libcurl. Macro __SETUP_ONCE_H no longer used in libcurl.
2 - Due to the circular interdependency of old lib/setup_once.h and the
c-ares setup_once.h header, old file lib/setup_once.h has carried
back from 2006 up to now days an alarming and prominent notice about
the need of keeping libcurl's and c-ares's setup_once.h in sync.
Given that this commit fixes the circular interdependency, the need
and presence of mentioned notice is removed.
All mentioned interdependencies come back from now old days when
the c-ares project lived inside a curl subdirectory. This commit
removes last traces of such fact.
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Include files for libcurl, external users.
They're all placed in the curl subdirectory here for better fit in any kind
of environment. You must include files from here using...
#include <curl/curl.h>
... style and point the compiler's include path to the directory holding the
curl subdirectory. It makes it more likely to survive future modifications.
NOTE FOR LIBCURL HACKERS
The following notes apply to libcurl version 7.19.0 and later.
* The distributed curl/curlbuild.h file is only intended to be used on systems
which can not run the also distributed configure script.
* The distributed curlbuild.h file is generated as a copy of curlbuild.h.dist
when the libcurl source code distribution archive file is originally created.
* If you check out from git on a non-configure platform, you must run the
appropriate buildconf* script to set up curlbuild.h and other local files
before being able of compiling the library.
* On systems capable of running the configure script, the configure process
will overwrite the distributed include/curl/curlbuild.h file with one that
is suitable and specific to the library being configured and built, which
is generated from the include/curl/curlbuild.h.in template file.
* If you intend to distribute an already compiled libcurl library you _MUST_
also distribute along with it the generated curl/curlbuild.h which has been
used to compile it. Otherwise the library will be of no use for the users of
the library that you have built. It is _your_ responsibility to provide this
file. No one at the cURL project can know how you have built the library.
* File curl/curlbuild.h includes platform and configuration dependent info,
and must not be modified by anyone. Configure script generates it for you.
* We cannot assume anything else but very basic compiler features being
present. While libcurl requires an ANSI C compiler to build, some of the
earlier ANSI compilers clearly can't deal with some preprocessor operators.
* Newlines must remain unix-style for older compilers' sake.
* Comments must be written in the old-style /* unnested C-fashion */
To figure out how to do good and portable checks for features, operating
systems or specific hardwarare, a very good resource is Bjorn Reese's
collection at http://predef.sf.net/