In order to do this and provide good feedback, a new macro was
created (AST_EXT_LIB_EXTRA_CHECK) which does the normal check and
path setups for the library then compiles, links and runs a supplied
code fragment to do the final determination.  In this case, the
final code fragment compares UNBOUND_VERSION_MAJOR
and UNBOUND_VERSION_MINOR to determine if they're greater than or
equal to 1.5.

Since we require version 1.5, some code in res_resolver_unbound
was also simplified.

ASTERISK-28045
Reported by: Samuel Galarneau

Change-Id: Iee94ad543cd6f8b118df8c4c7afd9c4e2ca1fa72

When `--without-libcurl` is used PBX_CURL is never set.  Set default
value 0 so the proper value is passed to menuselect.

Change-Id: I03e2842a00899cbca2dbde52bb1f6636d54bae1e

ASTERISK-27931

Change-Id: If298ce7f03be227a3687b9c20d382c9c55a72404

Asterisk requires GNU C extensions.  On some systems certain libraries
may incorrectly push -std=c99 into CFLAGS, thus breaking the build.
This change causes that flag to be stripped so the Asterisk build is not
broken by those libraries.  This change is made for both pkgconfig and
tool based libraries.

ASTERISK-27629 #close

Change-Id: I13389613b194abbac77becf90cd950dc168704db

ASTERISK-27670

Change-Id: I07a8ef8bbd6001e25711fa1bff152eb6c9efa729

The current configure script requires that tool when libpt-dev is installed.
libpt-dev was installed by libopenh323-dev, bacause you wanted to go for H.323
based channel drivers.

ASTERISK-25329

Change-Id: I9c6ab78b7246c21536e1d252dcbffe682f63f83d

ASTERISK-26046

Change-Id: I48f05698c235f709225b92bec5aa260fb57d69d1

Change-Id: I873c1c6d00f447269bd841494459efccdd2c19c0

The m4_ifblank macro is not available on CentOS 6, reverse conditionals
to allow use of m4_ifval instead.  ./bootstrap.sh was run but this patch
does not result in any difference to the generated configure script.

Change-Id: I280785deb872ed8d3339d99cce63a2b54d5f1438

Change-Id: I530c0a72f965437acef6a9a4fbfe5c487f078b65

This change causes the configure script to fail if the C compiler does
not support both function attributes constructor and destructor.  These
were already required as modules cannot function without these attributes
and Asterisk requires modules.

This also has AST_GCC_ATTRIBUTE set a variable
ax_cv_have_func_attribute_$1.  This is the same variable name used by
autoconf-archive's AX_GCC_FUNC_ATTRIBUTE, used for the same purpose.

Change-Id: Id68e8a1447f2a6d707c54b56350e7bfdb33fb663

ASTERISK-25294 #close
Reported by: Tzafrir Cohen

ASTERISK-26976 #close
Reported by: Alex

Change-Id: I789b1c3d1ed31365bbd9339fa58ef36f48833c40

Updated the macro-set autoconf/ax_pthread.m4 to its latest upstream version.

ASTERISK-26046 #close

Change-Id: I11abc11d17acd2b6a8a5a5be8ae8e0949dab9cc7

Updated the macro-set autoconf/libcurl.m4 to its latest upstream version. This
avoids a warning about an obsolete macro on AC_HELP_STRING, because Asterisk is
using AS_HELP_STRING everywhere else already.

ASTERISK-26046

Change-Id: I8299faf504ceaeee3e39930c59293809e116c631

Some configure scripts used both AC_HELP_STRING and its replacement
AS_HELP_STRING. For consistency and to avoid obsolete warnings, those were
changed to AS_HELP_STRING.

ASTERISK-26046

Change-Id: I8aad4fd2bdee40aa2a31ce3339a1eb33ff4f5b0f

GCC 4.7 Manual:
http://gcc.gnu.org/onlinedocs/gcc-4.7.4/gcc/Function-Attributes.html

weakref ("target")

A weak reference is an alias that does not by itself require a definition
to be given for the target symbol.

ASTERISK-22559 #close
Reported by: Ibercom

Change-Id: I36a136cae947b65187a697533416f9ff9a0b8cdf

Created autoconf/ast_check_raii.m4: contains AST_CHECK_RAII which
checks compiler requirements for RAII:
gcc: -fnested-functions support
clang: -fblocks (and if required -lBlocksRuntime)
The original check was implemented in configure.ac and now has it's
own file. This function also sets C_COMPILER_FAMILY to either gcc or
clang for use by makefile

Created autoconf/ast_check_strsep_array_bounds.m4 (contains
AST_CHECK_STRSEP_ARRAY_BOUNDS):
which checks if clang is able to handle the optimized strsep & strcmp
functions (linux). If not, the standard libc implementation should be
used instead. Clang + the optimized macro's work with:
strsep(char *, char []), but not with strsepo(char *, char *).
Instead of replacing all the occurences throughout the source code,
not using the optimized macro version seemed easier

See 'define __strcmp_gc(s1, s2, l2) in bits/string2.h':
llvm-comment: Normally, this array-bounds warning are suppressed for
macros, so that unused paths like the one that accesses __s1[3] are
not warned about.  But if you preprocess manually, and feed the
result to another instance of clang, it will warn about all the
possible forks of this particular if statement. Instead of switching
of this optimization, another solution would be to run the preproces-
sing step with -frewrite-includes, which should preserve enough
information so that clang should still be able to suppress the diag-
nostic at the compile step later on.

See also "https://llvm.org/bugs/show_bug.cgi?id=20144"
See also "https://llvm.org/bugs/show_bug.cgi?id=11536"

Makefile.rules: If C_COMPILER_FAMILY=clang then add two warning
suppressions:
-Wno-unused-value
-Wno-parentheses-equality
In an earlier review (reviewboard: 4550 and 4554), they were deemed a
nuisace and less than benefitial.

configure.ac:
Added AST_CHECK_RAII() see earlier
Added AST_CHECK_STRSEP_ARRAY_BOUNDS() see earlier
Removed moved content

ASTERISK-24917
Change-Id: I12ea29d3bda2254ad3908e279b7effbbac6a97cb

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@418894 65c4cc65-6c06-0410-ace0-fbb531ad65f3

ast_ext_tool_check.m4 isn't handling cases where a path to a package is
provided (E.G. --with-mysqlclient=/some/sysroot) and the package has a config
tool (E.G. mysql_config) and the package has its own subdirectories in include
or lib.  For example, mysql's libraries are in ${MYSQLCLIENT_DIR}/usr/lib/mysql
but ast_ext_tool_check sets MYSQLCLIENT_LIB to ${MYSQLCLIENT_DIR}/usr/lib.
libxml2 has the same problem with its includes.  They're in 
${LIBXML2_DIR}/usr/include/libxml2 not directly in ${LIBXML2_DIR}/usr/include.
Both cause configure to fail and there are others in the same boat.

The problem is caused by logic in ast_ext_tool_check that overrides the result
of the config tool's --cflags and --libs options if package_DIR is set.

This patch prepends package_DIR (if specified) to the -L and -I results from
the package's config tool instead of overriding them.

Tested by: George Joseph
Tested by: Matt Jordan
Review: https://reviewboard.asterisk.org/r/3550/
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With ptlib 2.10.9, the configure script fails due to grep returning multiple
matches for the pattern it searches for. This patch updates the pattern
matching to return only the actual version for the symbol searched for,
PTLIB_VERSION.

(closes issue ASTERISK-20980)
Reported by: Stefan Reuter
patches:
  ASTERISK-20980-1.patch uploaded by Stefan Reuter (license 5339)
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AST_PKG_CONFIG_CHECK: Similar to AST_EXT_LIB_CHECK, but simply uses
pkg-config data.

This simple version only uses pkg-config(1)'s tests.

This commit also uses the macro to test for GTK2 and GMIME (instead of
the current direct usage of pkg-config).

Review: https://reviewboard.asterisk.org/r/1906/



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@366351 65c4cc65-6c06-0410-ace0-fbb531ad65f3

The principle difference between libvorbisfile v1.1.2 and newer (at least
v1.2.0) is the addition of the predefined callbacks OV_CALLBACKS_xxx in
vorbis/vorbisfile.h used for ov_open_callbacks().

* Updated the configure script to detect if libvorbisfile.h declares
OV_CALLBACKS_NOCLOSE.

* Copied the declaration of OV_CALLBACKS_NOCLOSE from v1.2.0 to allow
v1.1.2 to compile.

(closes issue ASTERISK-19370)
Reported by: Jonn Taylor
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Recent versions of autoconf (2.68 on my system) won't properly process the configure
script unless every call to AC_LANG_PROGRAM is m4-quoted. Many calls in the script
were, but many were not. This patch corrects the unquoted calls.
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  r339720 | rmudgett | 2011-10-06 17:58:40 -0500 (Thu, 06 Oct 2011) | 27 lines
  
  Merged revisions 339719 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.8
  
  ........
    r339719 | rmudgett | 2011-10-06 17:47:50 -0500 (Thu, 06 Oct 2011) | 20 lines
    
    Fix regression in configure script for libpri capability checks.
    
    JIRA AST-598 added the PRI_L2_PERSISTENCE option to fix BRI PTMP TE layer
    2 persistence issues with some telcos.  ASTERISK-18535 attempted to fix
    the unexpected requirement that libpri *must* have that feature to work
    with Asterisk.  The AST_EXT_LIB_SETUP_DEPENDENT lines made the PRI
    optional features required.  Unfortunately, I thought
    AST_EXT_LIB_SETUP_DEPENDENT didn't do anything useful for libpri and
    deleted those lines for libpri.  The result was the HAVE_PRI_xxx defines
    that control the ability to use optional libpri features were also
    deleted.
    
    * Created AST_EXT_LIB_SETUP_OPTIONAL configuration macro to allow optional
    features in a library that the source code could take advantage of if the
    code supports the feature.
    
    (closes issue ASTERISK-18687)
    Reported by: Norbert
    Tested by: rmudgett
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  r316193 | tzafrir | 2011-05-03 13:57:16 +0300 (ג', 03 מאי 2011) | 8 lines
  
  Re-fix bashism in ./configure: s/let/$(( ))/
  
  A forward-port in r278985 accidentally re-introduced issue 17485. Fixing
  it. Thanks to Jilles Tjoelker for the good report.
  
  (closes issue #17485)
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  r301221 | pabelanger | 2011-01-09 16:40:34 -0500 (Sun, 09 Jan 2011) | 21 lines
  
  Merged revisions 301220 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
  ........
    r301220 | pabelanger | 2011-01-09 16:38:24 -0500 (Sun, 09 Jan 2011) | 14 lines
    
    SOUND_CACHE_DIR now defaults to empty
    
    Sounds files included in the Asterisk tarball were being ignored and
    re-downloaded.  Users wanting to cache the files can still override the setting
    using the --with-sounds-cache option.
    
    (closes issue #18589)
    Reported by: pabelanger
    Patches:
          issue18589.patch uploaded by pabelanger (license 224)
          Tested by: pabelanger
    
    Review: https://reviewboard.asterisk.org/r/1074/
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  r290752 | qwell | 2010-10-07 15:58:47 -0500 (Thu, 07 Oct 2010) | 23 lines
  
  Merged revisions 290751 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
  ................
    r290751 | qwell | 2010-10-07 15:57:14 -0500 (Thu, 07 Oct 2010) | 16 lines
    
    Merged revisions 290750 via svnmerge from 
    https://origsvn.digium.com/svn/asterisk/branches/1.4
    
    ........
      r290750 | qwell | 2010-10-07 15:56:04 -0500 (Thu, 07 Oct 2010) | 9 lines
      
      Allow PRI to build properly when using --with-pri.
      
      Use the directories found for the parent when using lib dependencies.
      
      (closes issue #17314)
      Reported by: tzafrir
      Patches: 
            17314-withdeps.diff uploaded by qwell (license 4)
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  r279502 | seanbright | 2010-07-26 11:43:54 -0400 (Mon, 26 Jul 2010) | 12 lines
  
  Merged revisions 279501 via svnmerge from 
  https://origsvn.digium.com/svn/asterisk/branches/1.6.2
  
  ........
    r279501 | seanbright | 2010-07-26 11:41:13 -0400 (Mon, 26 Jul 2010) | 5 lines
    
    Expand the correct value within AST_OPTION_ONLY.
    
    (closes issue #17703)
    Reported by: stuarth
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  r278984 | tilghman | 2010-07-23 12:04:15 -0500 (Fri, 23 Jul 2010) | 5 lines
  
  Establish a maximum version for openh323 (i.e. not opal), because chan_h323 will fail to load, even if it links.
  
  (issue #17679)
  Reported by: am
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  r277738 | tilghman | 2010-07-17 11:59:11 -0500 (Sat, 17 Jul 2010) | 5 lines
  
  Remove uclibc cross-compile triplet, as uclibc has a working fork()... it's only uclinux that does not.
  
  (closes issue #17616)
   Reported by: pprindeville
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(closes issue #17654)
 Reported by: pprindeville
 Patches: 
       issue17654.diff uploaded by qwell (license 4)
 Tested by: qwell, pprindeville


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@276830 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Review: https://reviewboard.asterisk.org/r/790/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@276731 65c4cc65-6c06-0410-ace0-fbb531ad65f3

(closes issue #16991)
Reported by: pprindeville
Patches: 
      with_netsnmp.patch.txt uploaded by twilson (license 396)
Tested by: twilson

Review: https://reviewboard.asterisk.org/r/739/


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@272254 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Theoretically the ./configure script is a pure bourne-shell script.
Practically it may be run by bash if /bin/sh is not good enough. But we should not count on it. See bug report for the gory details.

(closes issue #17485)
Patches:
      0001-remove-bashism-from-ast_check_pwlib.m4.patch uploaded by tzafrir (license 46)


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  r267971 | tilghman | 2010-06-04 11:27:02 -0500 (Fri, 04 Jun 2010) | 2 lines
  
  As-fixiate the build process
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git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@267819 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Cache sound tarfiles in a common directory, such that a clean reinstall does not force a re-download of the tarballs.

(closes issue #15370)
 Reported by: pprindeville
 Patches: 
       asterisk-trunk-bugid15370.patch uploaded by pprindeville (license 347)
 Tested by: pprindeville, tilghman, seanbright


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@263724 65c4cc65-6c06-0410-ace0-fbb531ad65f3

Cleanup a bit more by getting rid of useless version defines. Also make library detection use passed CFLAGS.

(closes issue #17309)
 Reported by: stuarth


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  r214517 | tilghman | 2009-08-27 16:45:34 -0500 (Thu, 27 Aug 2009) | 7 lines
  
  Use autoconf to detect libcurl, as this enables cross-compilation checks, something we didn't allow before.
  (closes issue #15714)
   Reported by: pprindeville
   Patches: 
         20090813__issue15714.diff.txt uploaded by tilghman (license 14)
   Tested by: pprindeville
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