File: configure.ac

package info (click to toggle)
libxs 1.2.0-2
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, buster, sid, stretch
  • size: 6,136 kB
  • ctags: 2,159
  • sloc: cpp: 16,233; sh: 10,244; ansic: 405; makefile: 354
file content (579 lines) | stat: -rw-r--r-- 17,354 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
#                                               -*- Autoconf -*-
# Process this file with autoconf to produce a configure script.
AC_PREREQ([2.64])
#
# The Crossroads version number is extracted from include/xs.h using
# the version.sh script. Hence, it should be updated there.
# The version in git should reflect the *next* version planned.
#
AC_INIT([libxs], [m4_esyscmd([./version.sh])],
    [crossroads-dev@groups.crossroads.io], [libxs], [http://www.crossroads.io/])

AC_CONFIG_AUX_DIR([config])
AC_CONFIG_MACRO_DIR([m4])
AC_CONFIG_HEADERS([src/platform.hpp])
AM_INIT_AUTOMAKE([tar-ustar dist-zip foreign])
m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])

# ABI version for libxs (Libtool -version-info)
#
# Don't change this unless you know exactly what you're doing and have read and
# understand:
# http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
#
# libxs -version-info current:revision:age
LIBXS_ABI_VERSION="2:0:0"
AC_SUBST(LIBXS_ABI_VERSION)

# ABI version for XS libzmq compatibility library
#
# This must be set to the ABI version of libzmq we are emulating.
# This is currently libzmq 2.1 which is ABI 1.0.0.
#
# libzmq -version-info current:revision:age
LIBZMQ_ABI_VERSION="1:0:0"
AC_SUBST([LIBZMQ_ABI_VERSION])

# Take a copy of original flags
XS_ORIG_CFLAGS="${CFLAGS:-none}"
XS_ORIG_CPPFLAGS="${CPPFLAGS:-none}"
XS_ORIG_CXXFLAGS="${CXXFLAGS:-none}"

# Checks for programs.
AC_PROG_CC
AC_PROG_CC_C99
AC_PROG_CXX
AM_PROG_CC_C_O
AC_PROG_SED
AC_PROG_AWK

# Enable system extensions
AC_USE_SYSTEM_EXTENSIONS

# Libtool configuration for different targets. See acinclude.m4
AC_ARG_VAR([XMLTO], [Path to xmlto command])
AC_PATH_PROG([XMLTO], [xmlto])
AC_ARG_VAR([ASCIIDOC], [Path to asciidoc command])
AC_PATH_PROG([ASCIIDOC], [asciidoc])
LIBXS_CONFIG_LIBTOOL
LT_INIT([win32-dll])

# Check whether to build a with debug symbols
LIBXS_CHECK_ENABLE_DEBUG

# Check wheter to enable code coverage
LIBXS_WITH_GCOV

# Checks for libraries.
AX_PTHREAD([
    LIBS="$PTHREAD_LIBS $LIBS"
    CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
    CXXFLAGS="$CXXFLAGS $PTHREAD_CFLAGS"
    CC="$PTHREAD_CC"
])

AC_CHECK_LIB([rt], [clock_gettime])

# Set pedantic
libxs_pedantic="yes"

# Don't FTBFS due to compiler diagnostics (Debian BTS #754324)
libxs_werror="no"

# By default use DSO visibility
libxs_dso_visibility="yes"

# Whether we are on mingw or not.
libxs_on_mingw32="no"

# For host type checks
AC_CANONICAL_HOST

# OS-specific tests
AS_CASE(["${host_os}"],
    [*linux*], [
        AC_DEFINE([XS_HAVE_LINUX], [1], [Have Linux OS])

        AS_CASE(["${host_os}"],
            [*android*], [
                AC_DEFINE([XS_HAVE_ANDROID], [1], [Have Android OS])
            ]
        )
     ],
    [*solaris*], [
        AC_DEFINE([XS_HAVE_SOLARIS], [1], [Have Solaris OS])
        AC_CHECK_LIB([socket], [socket])
        AC_CHECK_LIB([nsl], [gethostbyname])
    ],
    [*freebsd*], [
        AC_DEFINE([XS_HAVE_FREEBSD], [1], [Have FreeBSD OS])
    ],
    [*darwin*], [
        libxs_pedantic="no"
        libxs_werror="no"
        AC_DEFINE([XS_HAVE_OSX], [1], [Have DarwinOSX OS])
        AC_LANG_PUSH([C++])
        LIBXS_CHECK_LANG_FLAG_PREPEND([-Wno-uninitialized])
        AC_LANG_POP([C++])
     ],
    [*netbsd*], [
        AC_DEFINE([XS_HAVE_NETBSD], [1], [Have NetBSD OS])
    ],
    [openbsd*], [
        AC_DEFINE([XS_HAVE_OPENBSD], [1], [Have OpenBSD OS])
    ],
    [*nto-qnx*], [
        libxs_pedantic="no"
        AC_DEFINE([XS_HAVE_QNXNTO], [1], [Have QNX Neutrino OS])
        AC_CHECK_LIB([socket], [socket])
    ],
    [*aix*], [
        AC_DEFINE([XS_HAVE_AIX], [1], [Have AIX OS])
    ],
    [*hpux*], [
        AC_DEFINE([XS_HAVE_HPUX], [1], [Have HPUX OS])
        LIBXS_CHECK_LANG_FLAG_PREPEND([-Ae])
        AC_CHECK_FUNCS([gethrtime])
    ],
    [*mingw32*], [
        AC_DEFINE([XS_HAVE_WINDOWS], [1], [Have Windows OS])
        AC_DEFINE([XS_HAVE_MINGW32], [1], [Have MinGW32])
        AC_CHECK_HEADERS([windows.h])
        AC_CHECK_LIB([ws2_32], [main], [],
            [AC_MSG_ERROR([cannot link with ws2_32.dll.])])
        AC_CHECK_LIB([rpcrt4], [main], [],
            [AC_MSG_ERROR([cannot link with rpcrt4.dll.])])
        AC_CHECK_LIB([iphlpapi], [main], [],
            [AC_MSG_ERROR([cannot link with iphlpapi.dll.])])
        # mingw32 defines __int64_t as long long
        AC_LANG_PUSH([C++])
        LIBXS_CHECK_LANG_FLAG_PREPEND([-Wno-long-long])
        AC_LANG_POP([C++])
        libxs_on_mingw32="yes"
        libxs_dso_visibility="no"

        AS_IF([test "x$enable_static" = "xyes"], [
            AC_MSG_ERROR([Building static libraries is not supported under MinGW32])
        ])
    ],
    [*cygwin*], [
        AC_DEFINE([XS_HAVE_CYGWIN], [1], [Have Cygwin])
        AS_IF([test "x$enable_static" = "xyes"], [
            AC_MSG_ERROR([Building static libraries is not supported under Cygwin])
        ])
    ],
    [AC_MSG_WARN([unsupported system: ${host_os}.])]
)

#
# Check if the compiler supports -fvisibility=hidden flag. MinGW32 uses __declspec
#
AS_IF([test "x$libxs_dso_visibility" = "xyes"], [
    AC_LANG_PUSH([C++])
    LIBXS_CHECK_LANG_VISIBILITY([LIBXS_EXTRA_CXXFLAGS="$libxs_cv_[]_AC_LANG_ABBREV[]_visibility_flag ${LIBXS_EXTRA_CXXFLAGS}"])
    AC_LANG_POP([C++])
])

# CPU-specific optimizations
AS_CASE(["${host_cpu}"],
    [*sparc*], [
        AC_LANG_PUSH([C++])
        LIBXS_CHECK_LANG_FLAG_PREPEND([-mcpu=v9])
        AC_LANG_POP([C++])
    ]
)

# Check whether to build docs / install man pages
LIBXS_CHECK_DOC_BUILD

# Checks for header files.
AC_HEADER_STDC
AC_CHECK_HEADERS([ \
    link.h \
    dirent.h \
    dlfcn.h \
    errno.h \
    fcntl.h \
    arpa/inet.h \
    netinet/tcp.h \
    netinet/in.h \
    stddef.h \
    stdlib.h \
    string.h \
    sys/socket.h \
    sys/stat.h \
    sys/time.h \
    sys/types.h \
    time.h \
    unistd.h \
    limits.h
])

# Check if we have ifaddrs.h header file.
AC_CHECK_HEADERS([ifaddrs.h],
    [AC_DEFINE([XS_HAVE_IFADDRS], [1], [Have ifaddrs.h header.])])

###############################################################################
# Check available atomic implementations
#
# We have following variants:
#   o  gcc __sync_*() [XS_ATOMIC_GCC_SYNC]
#   o  optional atomic.h with atomic_cas_32() on solaris and netbsd [XS_ATOMIC_SOLARIS]
#   o  windows specific [XS_HAVE_WINDOWS]
#   o  handwritten inline asm for x86 and arm [no specific define]
#   o  fallback to mutexes (or force by hands) [no specific define]

#
# Check for Solaris and NetBSD style atomic.h
#
AC_LANG_PUSH([C++])
AC_MSG_CHECKING([for Solaris/NetBSD-style atomic.h])
AC_COMPILE_IFELSE([AC_LANG_PROGRAM(
    [[#include <atomic.h>]],
    [[uint32_t value;
      atomic_cas_32 (&value, 0, 0);
      return 0;]])],
    [solaris_style_atomic=yes],
    [solaris_style_atomic=no])
AC_MSG_RESULT([$solaris_style_atomic])
AS_IF([test "x$solaris_style_atomic" = "xyes"], [
    AC_DEFINE([XS_ATOMIC_SOLARIS], [1], [Solaris/NetBSD-style atomic.h with atomic_cas_32()])
])
AC_LANG_POP([C++])

#
# Check for GCC-style __sync_*() builtins
#
AC_LANG_PUSH([C++])
AC_MSG_CHECKING([for GCC-style __sync_*() atomic builtins])
AC_LINK_IFELSE([AC_LANG_PROGRAM(
    [volatile void* p;],
    [[  int r;
        r = __sync_bool_compare_and_swap(&p, (void*) 0x12345, (void*) 0);
        return r;]])],
    [gcc_style_sync_atomic=yes],
    [gcc_style_sync_atomic=no])
AC_MSG_RESULT([$gcc_style_sync_atomic])
AS_IF([test "x$gcc_style_sync_atomic" = "xyes"], [
    AC_DEFINE([XS_ATOMIC_GCC_SYNC], [1], [GCC-style __sync_*() atomic builtins])
])
AC_LANG_POP([C++])


###############################################################################
# Check polling system                                                        #
###############################################################################

# Allow users to override the polling system
AC_ARG_WITH([poller],
    [AS_HELP_STRING([--with-poller],
        [choose polling system manually. valid values are kqueue, epoll, devpoll, poll or select [default=autodetect]])],
    [], [with_poller=autodetect])

# Check the various polling systems
LIBXS_CHECK_KQUEUE
LIBXS_CHECK_EPOLL
LIBXS_CHECK_DEVPOLL
LIBXS_CHECK_POLL
LIBXS_CHECK_SELECT

# Select the best available poller
AS_CASE([${with_poller}],
    [kqueue], [
        AS_IF([test x$acx_cv_have_kqueue != xyes], [
            AC_MSG_ERROR([kqueue() poller selected but not available])
        ])
        AC_DEFINE([XS_FORCE_KQUEUE], [1], [Forces use of kqueue()])
        libxs_cv_poller=kqueue
    ],
    [epoll], [
        AS_IF([test x$acx_cv_have_epoll != xyes], [
            AC_MSG_ERROR([epoll() poller selected but not available])
        ])
        AC_DEFINE([XS_FORCE_EPOLL], [1], [Forces use of epoll()])
        libxs_cv_poller=epoll
    ],
    [devpoll], [
        AS_IF([test x$acx_cv_have_devpoll != xyes], [
            AC_MSG_ERROR([/dev/poll poller selected but not available])
        ])
        AC_DEFINE([XS_FORCE_DEVPOLL], [1], [Forces use of /dev/poll])
        libxs_cv_poller=devpoll
    ],
    [poll], [
        AS_IF([test x$acx_cv_have_poll != xyes], [
            AC_MSG_ERROR([poll() poller selected but not available])
        ])
        AC_DEFINE([XS_FORCE_POLL], [1], [Forces use of poll()])
        libxs_cv_poller=poll
    ],
    [select], [
        AS_IF([test x$acx_cv_have_select != xyes], [
            AC_MSG_ERROR([select() poller selected but not available])
        ])
        AC_DEFINE([XS_FORCE_SELECT], [1], [Forces use of select()])
        libxs_cv_poller=select
    ],
    [autodetect], [
        AS_IF([test x$acx_cv_have_kqueue = xyes], [
            libxs_cv_poller=kqueue
        ], [test x$acx_cv_have_epoll = xyes], [
            libxs_cv_poller=epoll
        ], [test x$acx_cv_have_devpoll = xyes], [
            libxs_cv_poller=devpoll
        ], [test x$acx_cv_have_poll = xyes], [
            libxs_cv_poller=poll
        ], [test x$acx_cv_have_select = xyes], [
            libxs_cv_poller=select
        ], [
            AC_MSG_ERROR([no suitable polling system found])
        ])
    ],
    [*], [
        AC_MSG_ERROR([Invalid poller selected: ${with_poller}])
    ]
)

# Force not to use eventfd
AC_ARG_ENABLE([eventfd],
    [AS_HELP_STRING([--disable-eventfd], [disable eventfd [default=no]])],
    [xs_disable_eventfd=yes], [xs_disable_eventfd=no])

AS_IF([test "x$xs_disable_eventfd" != "xyes"], [
    # Check if we have eventfd.h header file.
    AC_CHECK_HEADERS([sys/eventfd.h],
        [AC_DEFINE([XS_HAVE_EVENTFD], [1], [Have eventfd extension.])])
])

# Use c++ in subsequent tests
AC_LANG_PUSH([C++])

AC_HEADER_STDBOOL
AC_C_CONST
AC_C_INLINE

# Checks for typedefs, structures, and compiler characteristics.
AS_IF([test "x$libxs_cv_[]_AC_LANG_ABBREV[]_intel_compiler" = "xyes"], [
    dnl 279: controlling expression is constant
    dnl Fixes build with ICC 12.x
    LIBXS_CHECK_WITH_FLAG([-wd279], [AC_TYPE_SIZE_T])
    LIBXS_CHECK_WITH_FLAG([-wd279], [AC_TYPE_SSIZE_T])
], [
    AC_TYPE_SIZE_T
    AC_TYPE_SSIZE_T
])

AC_TYPE_UINT32_T
AC_C_VOLATILE

#  libzmq compatibility mode
libxs_libzmq="no"
AC_ARG_ENABLE([libzmq], [AS_HELP_STRING([--enable-libzmq],
    [install libzmq compatibility library and headers [default=no]])],
    [enable_libzmq=$enableval], [enable_libzmq=no])

AS_IF([test "x$enable_libzmq" != "xno"], [
    AC_MSG_NOTICE([enabling libzmq compatibility library and headers])
    libxs_libzmq="yes"
])

# Plug-in support
AC_ARG_ENABLE([plugins], [AS_HELP_STRING([--enable-plugins],
    [enable plugins [default=auto]])],
    [enable_plugins=$enableval], [enable_plugins=auto])

AS_IF([test "x$enable_plugins" != "xno"], [
    # Check if libdl is required, then check for dlopen and lstat, they are
    # both needed to enable plug-in support
    AC_SEARCH_LIBS([dlopen], [dl])
    AC_CHECK_FUNCS([lstat dlopen], [], [
        AS_IF([test "x$enable_plugins" = "xyes"], [
            AC_MSG_ERROR([Plugins support not available])
        ], [
            AC_MSG_WARN([Plugins support disabled])
            enable_plugins=no
        ])
    ])

    # If shared library support is disabled disable plugins support
    AS_IF([test "x$enable_shared" = "xno"], [
        AC_MSG_WARN([Shared library support disabled, disabling plug-ins])
        enable_plugins=no
    ], [
        enable_plugins=yes
        AC_DEFINE([XS_HAVE_PLUGINS], [1], [Whether plugins support is enabled])
    ])
])

#  PGM extension
libxs_pgm_ext="no"

pgm_basename="libpgm-5.1.118~dfsg"

AC_ARG_WITH([pgm], [AS_HELP_STRING([--with-pgm],
    [build libxs with PGM extension [default=no]])],
    [with_pgm_ext=$withval], [with_pgm_ext=no])

# build using system pgm
AC_ARG_WITH([system-pgm], [AS_HELP_STRING([--with-system-pgm],
    [build libxs with PGM extension. Requires pkg-config [default=no]])],
    [with_system_pgm_ext=yes], [with_system_pgm_ext=no])

AS_IF([test "x$with_pgm_ext" != "xno" \
    && test "x$with_system_pgm_ext" != "xno"],
[
    AC_MSG_ERROR([--with-pgm and --with-system-pgm cannot be specified together])
])

AS_IF([test "x$with_pgm_ext" != "xno"], [
    # This allows placing the tar.gz to foreign/openpgm
    # and using ./configure --with-pgm=libpgm-x.y.z
    AS_IF([test "x$with_pgm_ext" != "xyes"], [
        pgm_basename="$with_pgm_ext"
    ])

    # Unpack libpgm
    AC_MSG_NOTICE([Unpacking ${pgm_basename}.tar.gz])
    libxs_pwd=`pwd`
    cd foreign/openpgm

    AS_IF([! (gzip -dc "${pgm_basename}.tar.gz" || echo "failed") | ${am__untar}], [
        AC_MSG_ERROR([cannot unpack the foreign/openpgm/${pgm_basename}.tar.gz file])
    ])

    cd "${libxs_pwd}"

    AS_IF([test -d foreign/openpgm/build-staging], [
        rm -rf foreign/openpgm/build-staging
    ])

    mv foreign/openpgm/${pgm_basename} foreign/openpgm/build-staging
    pgm_srcdir=foreign/openpgm/build-staging/openpgm/pgm

    AS_IF([! test -d foreign/openpgm/build-staging/openpgm/pgm/config], [
        mkdir foreign/openpgm/build-staging/openpgm/pgm/config
    ])

    # DSO symbol visibility for openpgm
    AC_LANG_PUSH([C])
    LIBXS_CHECK_LANG_VISIBILITY([ac_configure_args="CFLAGS='$libxs_cv_[]_AC_LANG_ABBREV[]_visibility_flag' ${ac_configure_args}"])
    AC_LANG_POP([C])

    pgm_subdir=build-staging/openpgm/pgm
    AC_SUBST([pgm_subdir])

    AC_SUBST([pgm_srcdir])
    AC_CONFIG_SUBDIRS([foreign/openpgm/build-staging/openpgm/pgm/])

    # Success!
    AC_DEFINE([XS_HAVE_OPENPGM], [1], [Have OpenPGM extension])
    libxs_pgm_ext="yes"
])

# Build with system openpgm
AS_IF([test "x$with_system_pgm_ext" != "xno"], [
    m4_ifdef([PKG_CHECK_MODULES], [
        PKG_CHECK_MODULES([OpenPGM], [openpgm-5.2 >= 5.2])
        AC_DEFINE([XS_HAVE_OPENPGM], [1], [Have OpenPGM extension])
        LIBXS_EXTRA_CXXFLAGS="$OpenPGM_CFLAGS $LIBXS_EXTRA_CXXFLAGS"
    ],
    [AC_MSG_ERROR([--with-system-pgm requires a working pkg-config installation])])
])

AC_SUBST([pgm_basename])

# Set -Wall, -Werror and -pedantic
AC_LANG_PUSH([C++])

# Check how to enable -Wall
LIBXS_LANG_WALL([CPPFLAGS="$libxs_cv_[]_AC_LANG_ABBREV[]_wall_flag $CPPFLAGS"])

AS_IF([test "x$libxs_werror" = "xyes" \
    && test "x$libxs_cv_[]_AC_LANG_ABBREV[]_sun_studio_compiler" != "xyes"],
[
    LIBXS_LANG_WERROR([CPPFLAGS="$libxs_cv_[]_AC_LANG_ABBREV[]_werror_flag $CPPFLAGS"])
])

AS_IF([test "x$libxs_pedantic" = "xyes"], [
    LIBXS_LANG_STRICT([CPPFLAGS="$libxs_cv_[]_AC_LANG_ABBREV[]_strict_flag $CPPFLAGS"])
])
AC_LANG_POP([C++])

AM_CONDITIONAL([BUILD_LIBZMQ], [test "x$libxs_libzmq" = "xyes"])
AM_CONDITIONAL([BUILD_PGM], [test "x$libxs_pgm_ext" = "xyes"])
AM_CONDITIONAL([ON_MINGW], [test "x$libxs_on_mingw32" = "xyes"])

# Checks for library functions.
AC_CHECK_FUNCS([ \
    perror \
    gettimeofday \
    clock_gettime \
    memset \
    socket \
    getifaddrs \
    freeifaddrs
])

LIBXS_CHECK_SOCK_CLOEXEC([
    AC_DEFINE([XS_HAVE_SOCK_CLOEXEC], [1],
        [Whether SOCK_CLOEXEC is defined and functioning.])
])

# Subst LIBXS_EXTRA_CFLAGS & CXXFLAGS & LDFLAGS
AC_SUBST([LIBXS_EXTRA_CFLAGS])
AC_SUBST([LIBXS_EXTRA_CXXFLAGS])
AC_SUBST([LIBXS_EXTRA_LDFLAGS])

AC_CONFIG_FILES([
    Makefile
    src/Makefile
    doc/Makefile
    perf/Makefile
    src/libxs.pc
    builds/msvc/Makefile
    tests/Makefile
    foreign/openpgm/Makefile
])

AS_IF([test "x$libxs_libzmq" == "xyes"], [
    AC_CONFIG_FILES([src/libzmq.pc])
])

AC_OUTPUT

# Print configuration
cat <<EOF | tee -a config.log

## -------------- ##
## Configuration. ##
## -------------- ##

Configuration for $PACKAGE_STRING
    Host OS: $host_os
    Debugging information: ${enable_debug-no}
    GCC code coverage reporting: ${XS_GCOV-no}
    Polling system: $libxs_cv_poller
    Disable eventfd: $xs_disable_eventfd
    Build libzmq compatibility library and headers: $libxs_libzmq
    Plugins support: $enable_plugins
    PGM extension: $with_pgm_ext
    Use system-provided PGM library: $with_system_pgm_ext
    Build documentation: $libxs_build_doc

Environment variables:
    CPPFLAGS: $CPPFLAGS
    CFLAGS: $CFLAGS
    CXXFLAGS: $CXXFLAGS
    LDFLAGS: $LDFLAGS

Installation:
    Prefix: $prefix
    Install man pages: $libxs_install_man

EOF

AS_IF([test "x$libxs_libzmq" == "xyes"], [
    AC_MSG_WARN([The --enable-libzmq option was specified:])
    AC_MSG_WARN([libzmq compatibility library and headers are enabled.])
    AC_MSG_WARN([This will overwrite any existing installation of libzmq.])
])