1 # Process this file with autoconf to produce a configure script.
2 AC_INIT([libatomic_ops],[7.4.14],https://github.com/ivmai/libatomic_ops/issues)
5 AC_CANONICAL_TARGET([])
6 AC_CONFIG_SRCDIR(src/atomic_ops.c)
7 AC_CONFIG_MACRO_DIR([m4])
8 AM_INIT_AUTOMAKE([foreign dist-bzip2 nostdinc])
11 AC_CONFIG_HEADERS([src/config.h])
13 # Checks for programs.
16 LT_INIT([disable-shared])
18 # Checks for functions.
24 AC_MSG_CHECKING(for PIC compiler flag)
25 if test "$GCC" = yes; then
27 *-*-cygwin* | *-*-mingw*)
28 # Cygwin and Mingw[-w32/64] do not need -fPIC.
29 AC_MSG_RESULT("<none>")
34 AC_MSG_CHECKING(whether gcc -fPIC causes __PIC__ definition)
35 # Workaround: at least GCC 3.4.6 (Solaris) does not define this macro.
37 CFLAGS="$PICFLAG $CFLAGS"
42 ], [ac_cv_pic_macro=yes], [ac_cv_pic_macro=no])
44 AC_MSG_RESULT($ac_cv_pic_macro)
45 AS_IF([test "$ac_cv_pic_macro" = yes], [],
46 [PICFLAG="-D__PIC__=1 $PICFLAG"])
50 # Output all warnings.
51 AC_MSG_CHECKING(for gcc -Wextra)
53 CFLAGS="-Wextra $CFLAGS"
54 AC_TRY_COMPILE([],[], [ac_cv_cc_wextra=yes], [ac_cv_cc_wextra=no])
56 AC_MSG_RESULT($ac_cv_cc_wextra)
57 AS_IF([test "$ac_cv_cc_wextra" = yes], [WEXTRA="-Wextra"], [WEXTRA="-W"])
58 CFLAGS="-Wall $WEXTRA $CFLAGS"
64 CFLAGS="+O2 -mt $CFLAGS"
75 # Any Linux compiler had better be gcc compatible.
78 AC_MSG_RESULT("<none>")
83 AC_ARG_ENABLE(assertions,
84 [AC_HELP_STRING([--enable-assertions], [Assertion checking])])
85 if test "$enable_assertions" != yes; then
86 AC_DEFINE([NDEBUG], 1, [Define to disable assertion checking.])
89 AC_ARG_ENABLE(gcov, AC_HELP_STRING([--enable-gcov],
90 [Turn on code coverage analysis]))
91 if test "$enable_gcov" = "yes"; then
92 CFLAGS="$CFLAGS --coverage"
93 # Turn off code optimization to get accurate line numbers.
94 CFLAGS=`echo "$CFLAGS" | sed -e 's/-O\(1\|2\|3\|4\|s\|fast\)\?//g'`
100 # Extra user-defined C flags.
101 AC_SUBST([CFLAGS_EXTRA])
103 AH_TEMPLATE([_PTHREADS], [Indicates the use of pthreads (NetBSD).])
105 AH_TEMPLATE([AO_USE_NANOSLEEP],
106 [Use nanosleep() instead of select() (only if atomic operations \
108 AH_TEMPLATE([AO_USE_NO_SIGNALS],
109 [Do not block signals in compare_and_swap (only if atomic operations \
111 AH_TEMPLATE([AO_USE_WIN32_PTHREADS],
112 [Use Win32 Sleep() instead of select() (only if atomic operations \
114 AH_TEMPLATE([AO_TRACE_MALLOC], [Trace AO_malloc/free calls (for debug only)])
116 # These macros are tested in public headers
117 AH_TEMPLATE([AO_GENERALIZE_ASM_BOOL_CAS],
118 [Force compare_and_swap definition via fetch_compare_and_swap])
119 AH_TEMPLATE([AO_PREFER_GENERALIZED],
120 [Prefer generalized definitions to direct assembly-based ones])
121 AH_TEMPLATE([AO_USE_PTHREAD_DEFS],
122 [Emulate atomic operations via slow and async-signal-unsafe \
124 AH_TEMPLATE([AO_ASM_X64_AVAILABLE],
125 [Inline assembly available (only VC/x86_64)])
126 AH_TEMPLATE([AO_ASSUME_VISTA],
127 [Assume Windows Server 2003, Vista or later target (only VC/x86)])
128 AH_TEMPLATE([AO_ASSUME_WINDOWS98],
129 [Assume hardware compare-and-swap functionality available \
130 on target (only VC/x86)])
131 AH_TEMPLATE([AO_CMPXCHG16B_AVAILABLE],
132 [Assume target is not old AMD Opteron chip (only x86_64)])
133 AH_TEMPLATE([AO_FORCE_USE_SWP],
134 [Force test_and_set to use SWP instruction instead of LDREX/STREX \
136 AH_TEMPLATE([AO_NO_SPARC_V9], [Assume target is not sparc v9+ (only sparc)])
137 AH_TEMPLATE([AO_OLD_STYLE_INTERLOCKED_COMPARE_EXCHANGE],
138 [Assume ancient MS VS Win32 headers (only VC/arm v6+, VC/x86)])
139 AH_TEMPLATE([AO_UNIPROCESSOR], [Assume single-core target (only arm v6+)])
140 AH_TEMPLATE([AO_USE_INTERLOCKED_INTRINSICS],
141 [Assume Win32 _Interlocked primitives available as intrinsics \
143 AH_TEMPLATE([AO_USE_PENTIUM4_INSTRS],
144 [Use Pentium 4 'mfence' instruction (only x86)])
145 AH_TEMPLATE([AO_USE_SYNC_CAS_BUILTIN],
146 [Prefer GCC built-in CAS intrinsics in favor of inline assembly \
147 (only gcc/x86, gcc/x86_64)])
148 AH_TEMPLATE([AO_WEAK_DOUBLE_CAS_EMULATION],
149 [Emulate double-width CAS via pthread locking in case of no hardware \
150 support (only gcc/x86_64, the emulation is unsafe)])
152 AC_DEFINE(_REENTRANT, 1, [Required define if using POSIX threads.])
154 # Libraries needed to support threads (if any).
156 AC_CHECK_LIB(pthread, pthread_self, have_pthreads=true)
157 if test x$have_pthreads = xtrue; then
158 THREADDLLIBS=-lpthread
161 # Indicates the use of pthreads.
164 *-*-openbsd* | *-*-kfreebsd*-gnu | *-*-dgux*)
165 THREADDLLIBS=-pthread
167 *-*-cygwin* | *-*-darwin*)
168 # Cygwin does not have a real libpthread, so Libtool cannot link
173 # Use Win32 threads for tests anyway.
175 # Skip test_atomic_pthreads.
180 AC_DEFINE([AO_NO_PTHREADS], 1, [No pthreads library available])
181 # Assume VxWorks or Win32.
184 AC_SUBST(THREADDLLIBS)
186 AM_CONDITIONAL(HAVE_PTHREAD_H, test x$have_pthreads = xtrue)
187 AM_CONDITIONAL(NEED_ASM, test x$need_asm = xtrue)
194 pkgconfig/atomic_ops.pc
195 pkgconfig/atomic_ops-uninstalled.pc ])
197 AC_CONFIG_COMMANDS([default],[[]],[[