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# Process this file with autoconf to produce a configure script.
AC_INIT([libatomic_ops],[7.3alpha3],gc@linux.hpl.hp.com)
AC_PREREQ(2.61)
AC_CANONICAL_TARGET([])
AC_CONFIG_SRCDIR(src/atomic_ops.c)
AC_CONFIG_MACRO_DIR([m4])
AM_INIT_AUTOMAKE([foreign dist-bzip2 nostdinc])
AM_MAINTAINER_MODE
AM_CONFIG_HEADER(src/config.h)
# Checks for programs.
AM_PROG_CC_C_O
AM_PROG_AS
LT_INIT([disable-shared])
# Checks for functions.
AC_FUNC_MMAP
# Determine PIC flag.
need_asm=false
PICFLAG=
AC_MSG_CHECKING(for PIC compiler flag)
if test "$GCC" = yes; then
case "$host" in
*-*-cygwin* | *-*-mingw*)
# Cygwin and Mingw[-w32/64] do not need -fPIC.
AC_MSG_RESULT("<none>")
;;
*)
AC_MSG_RESULT(-fPIC)
PICFLAG=-fPIC
AC_MSG_CHECKING(whether gcc -fPIC causes __PIC__ definition)
# Workaround: at least GCC 3.4.6 (Solaris) does not define this macro.
old_CFLAGS="$CFLAGS"
CFLAGS="$PICFLAG $CFLAGS"
AC_TRY_COMPILE([],[
#ifndef __PIC__
# error
#endif
], [ac_cv_pic_macro=yes], [ac_cv_pic_macro=no])
CFLAGS="$old_CFLAGS"
AC_MSG_RESULT($ac_cv_pic_macro)
AS_IF([test "$ac_cv_pic_macro" = yes], [],
[PICFLAG="-D__PIC__=1 $PICFLAG"])
;;
esac
# Output all warnings.
AC_MSG_CHECKING(for gcc -Wextra)
old_CFLAGS="$CFLAGS"
CFLAGS="-Wextra $CFLAGS"
AC_TRY_COMPILE([],[], [ac_cv_cc_wextra=yes], [ac_cv_cc_wextra=no])
CFLAGS="$old_CFLAGS"
AC_MSG_RESULT($ac_cv_cc_wextra)
AS_IF([test "$ac_cv_cc_wextra" = yes], [WEXTRA="-Wextra"], [WEXTRA="-W"])
CFLAGS="-Wall $WEXTRA $CFLAGS"
else
case "$host" in
*-*-hpux*)
AC_MSG_RESULT("+Z")
PICFLAG="+Z"
CFLAGS="+O2 -mt $CFLAGS"
;;
*-*-solaris*)
AC_MSG_RESULT(-Kpic)
PICFLAG=-Kpic
CFLAGS="-O $CFLAGS"
need_asm=true
;;
*-*-linux*)
AC_MSG_RESULT(-fPIC)
PICFLAG=-fPIC
# Any Linux compiler had better be gcc compatible.
;;
*)
AC_MSG_RESULT("<none>")
;;
esac
fi
AC_ARG_ENABLE(assertions,
[AC_HELP_STRING([--enable-assertions], [Assertion checking])])
if test "$enable_assertions" != yes; then
AC_DEFINE([NDEBUG], 1, [Define to disable assertion checking.])
fi
AC_SUBST(PICFLAG)
AC_SUBST(DEFS)
AH_TEMPLATE([_PTHREADS], [Indicates the use of pthreads (NetBSD).])
AH_TEMPLATE([AO_USE_NANOSLEEP],
[Use nanosleep() instead of select() (only if atomic operations \
are emulated)])
AH_TEMPLATE([AO_USE_NO_SIGNALS],
[Do not block signals in compare_and_swap (only if atomic operations \
are emulated)])
AH_TEMPLATE([AO_USE_WIN32_PTHREADS],
[Use Win32 Sleep() instead of select() (only if atomic operations \
are emulated)])
AH_TEMPLATE([AO_TRACE_MALLOC], [Trace AO_malloc/free calls (for debug only)])
# These macros are tested in public headers
AH_TEMPLATE([AO_GENERALIZE_ASM_BOOL_CAS],
[Force compare_and_swap definition via fetch_compare_and_swap])
AH_TEMPLATE([AO_PREFER_GENERALIZED],
[Prefer generalized definitions to direct assembly-based ones])
AH_TEMPLATE([AO_USE_PTHREAD_DEFS],
[Emulate atomic operations via slow and async-signal-unsafe \
pthread locking])
AH_TEMPLATE([AO_ASM_X64_AVAILABLE],
[Inline assembly avalable (only VC/x86_64)])
AH_TEMPLATE([AO_ASSUME_VISTA],
[Assume Windows Server 2003, Vista or later target (only VC/x86)])
AH_TEMPLATE([AO_ASSUME_WINDOWS98],
[Assume hardware compare-and-swap functionality available \
on target (only VC/x86)])
AH_TEMPLATE([AO_CMPXCHG16B_AVAILABLE],
[Assume target is not old AMD Opteron chip (only x86_64)])
AH_TEMPLATE([AO_FORCE_USE_SWP],
[Force test_and_set to use SWP instruction instead of LDREX/STREX \
(only arm v6+)])
AH_TEMPLATE([AO_NO_SPARC_V9], [Assume target is not sparc v9+ (only sparc)])
AH_TEMPLATE([AO_OLD_STYLE_INTERLOCKED_COMPARE_EXCHANGE],
[Assume ancient MS VS Win32 headers (only VC/arm v6+, VC/x86)])
AH_TEMPLATE([AO_UNIPROCESSOR], [Assume single-core target (only arm v6+)])
AH_TEMPLATE([AO_USE_INTERLOCKED_INTRINSICS],
[Assume Win32 _Interlocked primitives available as intrinsics \
(only VC/arm)])
AH_TEMPLATE([AO_USE_PENTIUM4_INSTRS],
[Use Pentium 4 'mfence' instruction (only x86)])
AH_TEMPLATE([AO_USE_SYNC_CAS_BUILTIN],
[Prefer GCC built-in CAS intrinsics in favor of inline assembly \
(only gcc/x86, gcc/x86_64)])
AH_TEMPLATE([AO_WEAK_DOUBLE_CAS_EMULATION],
[Emulate double-width CAS via pthread locking in case of no hardware \
support (only gcc/x86_64, sunc/x86_64)])
THREADDLLIBS=
have_pthreads=true
## Libraries needed to support threads.
AC_CHECK_LIB(pthread, pthread_self, THREADDLLIBS="-lpthread",,)
AC_DEFINE(_REENTRANT, 1, [Required define if using POSIX threads.])
case "$host" in
*-*-netbsd*)
AC_DEFINE(_PTHREADS)
;;
*-*-openbsd* | *-*-kfreebsd*-gnu | *-*-dgux*)
THREADDLLIBS=-pthread
;;
*-*-cygwin* | *-*-darwin*)
THREADDLLIBS=
;;
*-*-mingw*)
THREADDLLIBS=
have_pthreads=false
;;
esac
AC_SUBST(THREADDLLIBS)
AM_CONDITIONAL(HAVE_PTHREAD_H, test x$have_pthreads = xtrue)
AM_CONDITIONAL(NEED_ASM, test x$need_asm = xtrue)
AC_CONFIG_FILES([
Makefile
doc/Makefile
src/Makefile
tests/Makefile
pkgconfig/atomic_ops.pc
pkgconfig/atomic_ops-uninstalled.pc ])
AC_CONFIG_COMMANDS([default],[[]],[[
PICFLAG="${PICFLAG}"
CC="${CC}"
DEFS="${DEFS}"
]])
AC_OUTPUT
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