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Apache HTTP Server
Platform specific notes:
------------------------
================
Darwin (OS X):
Apache 2 relies heavily on the use of autoconf and libtool to
provide a build environment. Darwin provides these tools as part
of the Developers Tools package. Under Darwin, however, GNUlibtool
is installed as 'glibtool' to avoid conflicting with the Darwin
'libtool' program. Apache 2 knows about this so that's not a
problem.
As of OS X 10.2 (Jaguar), the bundled versions work perfectly. Partly
this is due to the fact that /bin/sh is now 'bash' and not 'zsh' as
well as the fact that the bundled versions are up-to-date:
autoconf 2.52 and (g)libtool 1.4.2.
You will note that GNU libtool should actually be installed as
glibtool, to avoid conflict with a Darwin program of the same
name.
There have been some reports that autoconf 2.52 prevents Apache's
build system from correctly handling passing multi-value envvars
to the build system (eg: CFLAGS="-g -O3" ./configure), causing
errors. Use of bash does not seem to help in this situation. If
this affects you, downgrading to autoconf 2.13 (which is installed
on Darwin) will help.
With Leopard (at least up to 10.5.2), when running configure
you will likely see errors such as:
rm: conftest.dSYM: is a directory
This is a known issue and will be fixed in a later version of the
autoconf suite. These errors can be safely ignored.
For later versions of OS X, (10.8 and 10.9), be sure to have Xcode
AND Xcode Command Line Tools installed. httpd will built both with
gcc and clang.
==========
FreeBSD:
autoconf 2.52 creates scripts that are incompatible with the Posix
shell implementation (/bin/sh) on FreeBSD. Be sure to use v2.13
of autoconf.
Threaded MPMs are not supported on FreeBSD 4.x. Current releases of
FreeBSD 5.x (5.2 or later) support threaded MPMs correctly. You must pass
'--enable-threads=yes' to APR's configure in order to enable threads.
Additionally, you must use libthr or libkse via libmap.conf as the default
libc_r is still broken as of this writing. Please consult the man page for
libmap.conf for more details about configuring libthr or libkse.
================
HP-UX:
The dlopen() system call in HP-UX has problems when loading/unloading
C++ modules. The problem can be resolved by using shl_load() instead
of dlopen(). This is fixed in the Apache 2.0.44 release.
To enable loading of C++ modules, the httpd binary has to be linked with
the following libraries :
HP-UX (11.0 / 11i):
When using shl_load : "cpprt0_stub.s -lcl"
When using dlopen : "cpprt0_stub.s -lcl -lCsup"
HP-UX (11i version 1.5 and greater):
When using dlopen/shl_load : "cpprt0_stub.s -lcl -lunwind"
The cpprt0_stub.s can be downloaded from the web site :
http://h21007.www2.hp.com/hpux-devtools/CXX/hpux-devtools.0107/0083.html
Compile cpprt0_stub.s with the PIC option
cc -c +z cpprt0_stub.s
- OR -
gcc -c -fPIC cpprt0_stub.s
================
AIX, using the vendor C compiler with optimization:
There is an issue with compiling server/core.c with optimization enabled
which has been seen with C for AIX 5.0.2.3 and above. (5.0.2.0, 5.0.2.1,
and 5.0.2.2 have an additional problem with Apache 2.0.x, so either upgrade
the compiler or don't use optimization in order to avoid it.)
cc_r works fine with -O2 but xlc_r does not. In order to use xlc_r with
-O2, apply the patch at
http://www.apache.org/dist/httpd/patches/apply_to_2.0.49/aix_xlc_optimization.patch
(That patch works with many recent levels of Apache 2+.)
================
Solaris:
On Solaris, better performance may be achieved by using the Sun Studio
compiler instead of gcc. As of version 11, it is now free (registration
required). Download the compiler from:
http://developers.sun.com/prodtech/cc/downloads/index.jsp
If you use Sun Studio, the following compiler flags (CFLAGS) are
recommended:
-XO4 -xchip=generic
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