1 dnl Helper Functions for the RRDtool configure.ac script
3 dnl this file gets included into aclocal.m4 when runnning aclocal
7 dnl Check for the presence of a particular library and its header files
8 dnl if this check fails set the environment variable EX_CHECK_ALL_ERR to YES
9 dnl and prints out a helful message
12 dnl EX_CHECK_ALL(library, function, header, pkgconf name, tested-version, homepage)
16 AC_DEFUN([EX_CHECK_ALL],
19 dnl try compiling naked first
21 AC_CHECK_HEADER($3,[LIBS="-l$1 ${LIBS}";EX_CHECK_STATE=YES],[
22 dnl now asking pkg-config for help
23 AC_PATH_PROG(PKGCONFIG,pkg-config,no)
24 if test "$PKGCONFIG" != "no"; then
25 if $PKGCONFIG --exists $4; then
26 CPPFLAGS=${CPPFLAGS}" "`$PKGCONFIG --cflags $4`
27 LDFLAGS=${LDFLAGS}" "`$PKGCONFIG --libs-only-l $4`
28 LIBS=${LIBS}" " `$PKGCONFIG --libs-only-other $4`
29 AC_CHECK_LIB($1,$2,[ AC_CHECK_HEADER($3,[LIBS="-l$1 ${LIBS};EX_CHECK_STATE=YES"],[])],[])
32 ----------------------------------------------------------------------------
33 * I found a copy of pkgconfig, but there is no $4.pc file around.
34 You may want to set the PKG_CONFIG_PATH variable to point to its
42 if test ${EX_CHECK_STATE} = NO; then
44 ----------------------------------------------------------------------------
45 * I could not find a working copy of $4. Check config.log for hints on why
46 this is the case. Maybe you need to set LDFLAGS appropriately so that the
47 linker can find lib$1. If you have not installed $4, you can get it
48 either from its original home on
52 You can find also find an archive copy on
54 http://people.ee.ethz.ch/~oetiker/webtools/rrdtool/pub/libs
56 The last tested version of $4 is $5.
57 ----------------------------------------------------------------------------
64 dnl Ptherad check from http://autoconf-archive.cryp.to/acx_pthread.m4
66 dnl @synopsis ACX_PTHREAD([ACTION-IF-FOUND[, ACTION-IF-NOT-FOUND]])
68 dnl This macro figures out how to build C programs using POSIX threads.
69 dnl It sets the PTHREAD_LIBS output variable to the threads library and
70 dnl linker flags, and the PTHREAD_CFLAGS output variable to any special
71 dnl C compiler flags that are needed. (The user can also force certain
72 dnl compiler flags/libs to be tested by setting these environment
75 dnl Also sets PTHREAD_CC to any special C compiler that is needed for
76 dnl multi-threaded programs (defaults to the value of CC otherwise).
77 dnl (This is necessary on AIX to use the special cc_r compiler alias.)
79 dnl NOTE: You are assumed to not only compile your program with these
80 dnl flags, but also link it with them as well. e.g. you should link
81 dnl with $PTHREAD_CC $CFLAGS $PTHREAD_CFLAGS $LDFLAGS ... $PTHREAD_LIBS
84 dnl If you are only building threads programs, you may wish to use
85 dnl these variables in your default LIBS, CFLAGS, and CC:
87 dnl LIBS="$PTHREAD_LIBS $LIBS"
88 dnl CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
91 dnl In addition, if the PTHREAD_CREATE_JOINABLE thread-attribute
92 dnl constant has a nonstandard name, defines PTHREAD_CREATE_JOINABLE to
93 dnl that name (e.g. PTHREAD_CREATE_UNDETACHED on AIX).
95 dnl ACTION-IF-FOUND is a list of shell commands to run if a threads
96 dnl library is found, and ACTION-IF-NOT-FOUND is a list of commands to
97 dnl run it if it is not found. If ACTION-IF-FOUND is not specified, the
98 dnl default action will define HAVE_PTHREAD.
100 dnl Please let the authors know if this macro fails on any platform, or
101 dnl if you have any other suggestions or comments. This macro was based
102 dnl on work by SGJ on autoconf scripts for FFTW (www.fftw.org) (with
103 dnl help from M. Frigo), as well as ac_pthread and hb_pthread macros
104 dnl posted by Alejandro Forero Cuervo to the autoconf macro repository.
105 dnl We are also grateful for the helpful feedback of numerous users.
107 dnl @category InstalledPackages
108 dnl @author Steven G. Johnson <stevenj@alum.mit.edu>
109 dnl @version 2005-01-14
110 dnl @license GPLWithACException
112 AC_DEFUN([ACX_PTHREAD], [
113 AC_REQUIRE([AC_CANONICAL_HOST])
118 # We used to check for pthread.h first, but this fails if pthread.h
119 # requires special compiler flags (e.g. on True64 or Sequent).
120 # It gets checked for in the link test anyway.
122 # First of all, check if the user has set any of the PTHREAD_LIBS,
123 # etcetera environment variables, and if threads linking works using
125 if test x"$PTHREAD_LIBS$PTHREAD_CFLAGS" != x; then
126 save_CFLAGS="$CFLAGS"
127 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
129 LIBS="$PTHREAD_LIBS $LIBS"
130 AC_MSG_CHECKING([for pthread_join in LIBS=$PTHREAD_LIBS with CFLAGS=$PTHREAD_CFLAGS])
131 AC_TRY_LINK_FUNC(pthread_join, acx_pthread_ok=yes)
132 AC_MSG_RESULT($acx_pthread_ok)
133 if test x"$acx_pthread_ok" = xno; then
138 CFLAGS="$save_CFLAGS"
141 # We must check for the threads library under a number of different
142 # names; the ordering is very important because some systems
143 # (e.g. DEC) have both -lpthread and -lpthreads, where one of the
144 # libraries is broken (non-POSIX).
146 # Create a list of thread flags to try. Items starting with a "-" are
147 # C compiler flags, and other items are library names, except for "none"
148 # which indicates that we try without any flags at all, and "pthread-config"
149 # which is a program returning the flags for the Pth emulation library.
151 acx_pthread_flags="pthreads none -Kthread -kthread lthread -pthread -pthreads -mthreads pthread --thread-safe -mt pthread-config"
153 # The ordering *is* (sometimes) important. Some notes on the
154 # individual items follow:
156 # pthreads: AIX (must check this before -lpthread)
157 # none: in case threads are in libc; should be tried before -Kthread and
158 # other compiler flags to prevent continual compiler warnings
159 # -Kthread: Sequent (threads in libc, but -Kthread needed for pthread.h)
160 # -kthread: FreeBSD kernel threads (preferred to -pthread since SMP-able)
161 # lthread: LinuxThreads port on FreeBSD (also preferred to -pthread)
162 # -pthread: Linux/gcc (kernel threads), BSD/gcc (userland threads)
163 # -pthreads: Solaris/gcc
164 # -mthreads: Mingw32/gcc, Lynx/gcc
165 # -mt: Sun Workshop C (may only link SunOS threads [-lthread], but it
166 # doesn't hurt to check since this sometimes defines pthreads too;
167 # also defines -D_REENTRANT)
168 # pthread: Linux, etcetera
169 # --thread-safe: KAI C++
170 # pthread-config: use pthread-config program (for GNU Pth library)
172 case "${host_cpu}-${host_os}" in
175 # On Solaris (at least, for some versions), libc contains stubbed
176 # (non-functional) versions of the pthreads routines, so link-based
177 # tests will erroneously succeed. (We need to link with -pthread or
178 # -lpthread.) (The stubs are missing pthread_cleanup_push, or rather
179 # a function called by this macro, so we could check for that, but
180 # who knows whether they'll stub that too in a future libc.) So,
181 # we'll just look for -pthreads and -lpthread first:
183 acx_pthread_flags="-pthread -pthreads pthread -mt $acx_pthread_flags"
187 if test x"$acx_pthread_ok" = xno; then
188 for flag in $acx_pthread_flags; do
192 AC_MSG_CHECKING([whether pthreads work without any flags])
196 AC_MSG_CHECKING([whether pthreads work with $flag])
197 PTHREAD_CFLAGS="$flag"
201 AC_CHECK_PROG(acx_pthread_config, pthread-config, yes, no)
202 if test x"$acx_pthread_config" = xno; then continue; fi
203 PTHREAD_CFLAGS="`pthread-config --cflags`"
204 PTHREAD_LIBS="`pthread-config --ldflags` `pthread-config --libs`"
208 AC_MSG_CHECKING([for the pthreads library -l$flag])
209 PTHREAD_LIBS="-l$flag"
214 save_CFLAGS="$CFLAGS"
215 LIBS="$PTHREAD_LIBS $LIBS"
216 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
218 # Check for various functions. We must include pthread.h,
219 # since some functions may be macros. (On the Sequent, we
220 # need a special flag -Kthread to make this header compile.)
221 # We check for pthread_join because it is in -lpthread on IRIX
222 # while pthread_create is in libc. We check for pthread_attr_init
223 # due to DEC craziness with -lpthreads. We check for
224 # pthread_cleanup_push because it is one of the few pthread
225 # functions on Solaris that doesn't have a non-functional libc stub.
226 # We try pthread_create on general principles.
227 AC_TRY_LINK([#include <pthread.h>],
228 [pthread_t th; pthread_join(th, 0);
229 pthread_attr_init(0); pthread_cleanup_push(0, 0);
230 pthread_create(0,0,0,0); pthread_cleanup_pop(0); ],
231 [acx_pthread_ok=yes])
234 CFLAGS="$save_CFLAGS"
236 AC_MSG_RESULT($acx_pthread_ok)
237 if test "x$acx_pthread_ok" = xyes; then
246 # Various other checks:
247 if test "x$acx_pthread_ok" = xyes; then
249 LIBS="$PTHREAD_LIBS $LIBS"
250 save_CFLAGS="$CFLAGS"
251 CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
253 # Detect AIX lossage: JOINABLE attribute is called UNDETACHED.
254 AC_MSG_CHECKING([for joinable pthread attribute])
256 for attr in PTHREAD_CREATE_JOINABLE PTHREAD_CREATE_UNDETACHED; do
257 AC_TRY_LINK([#include <pthread.h>], [int attr=$attr;],
258 [attr_name=$attr; break])
260 AC_MSG_RESULT($attr_name)
261 if test "$attr_name" != PTHREAD_CREATE_JOINABLE; then
262 AC_DEFINE_UNQUOTED(PTHREAD_CREATE_JOINABLE, $attr_name,
263 [Define to necessary symbol if this constant
264 uses a non-standard name on your system.])
267 AC_MSG_CHECKING([if more special flags are required for pthreads])
269 case "${host_cpu}-${host_os}" in
270 *-aix* | *-freebsd* | *-darwin*) flag="-D_THREAD_SAFE";;
271 *solaris* | *-osf* | *-hpux*) flag="-D_REENTRANT";;
273 AC_MSG_RESULT(${flag})
274 if test "x$flag" != xno; then
275 PTHREAD_CFLAGS="$flag $PTHREAD_CFLAGS"
279 CFLAGS="$save_CFLAGS"
281 # More AIX lossage: must compile with cc_r
282 AC_CHECK_PROG(PTHREAD_CC, cc_r, cc_r, ${CC})
287 AC_SUBST(PTHREAD_LIBS)
288 AC_SUBST(PTHREAD_CFLAGS)
291 # Finally, execute ACTION-IF-FOUND/ACTION-IF-NOT-FOUND:
292 if test x"$acx_pthread_ok" = xyes; then
293 ifelse([$1],,AC_DEFINE(HAVE_PTHREAD,1,[Define if you have POSIX threads libraries and header files.]),[$1])