1 dnl Process this file with autoconf to produce a configure script.
3 dnl NB When updating the version for a release, update LIBRARY_VERSION_INFO
5 m4_define([project_version], [1.3.0])
6 AC_INIT([xapian-letor], project_version, [https://xapian.org/bugs])
9 dnl Extract from the libtool info manual:
11 dnl Here are a set of rules to help you update your library version information:
13 dnl 1. Start with version information of '0:0:0' for each libtool library.
15 dnl 2. Update the version information only immediately before a public
16 dnl release of your software. More frequent updates are unnecessary,
17 dnl and only guarantee that the current interface number gets larger
20 dnl 3. If the library source code has changed at all since the last
21 dnl update, then increment REVISION ('C:R:A' becomes 'C:r+1:A').
23 dnl 4. If any interfaces have been added, removed, or changed since the
24 dnl last update, increment CURRENT, and set REVISION to 0.
26 dnl 5. If any interfaces have been added since the last public release,
27 dnl then increment AGE.
29 dnl 6. If any interfaces have been removed since the last public release
30 dnl then set AGE to 0.
32 dnl LIBRARY_VERSION_INFO for libxapianletor:
33 dnl 0:0:0 1.3.1 First release with xapian-letor split out from xapian-core
34 LIBRARY_VERSION_INFO=0:0:0
35 AC_SUBST(LIBRARY_VERSION_INFO)
37 AM_INIT_AUTOMAKE([1.10.1 -Wportability tar-ustar])
39 AC_CONFIG_SRCDIR([letor.cc])
41 AC_CONFIG_HEADERS([config.h])
43 AC_CONFIG_MACRO_DIR([m4])
48 dnl disable "maintainer only" rules by default
51 dnl Checks for programs.
56 # Checked: freebsd8.0 openbsd4.6 solaris2.9 solaris2.10
58 linux* | k*bsd*-gnu | freebsd* | openbsd* | solaris*)
59 dnl Vanilla libtool sets this to "unknown" which it then handles as "yes".
60 link_all_deplibs_CXX=no
66 dnl Extract search path from ldconfig which is more reliable than the way
67 dnl vanilla libtool extracts them from ld.so.conf.
68 d=`/sbin/ldconfig -N -X -v 2>&AS_MESSAGE_LOG_FD|$SED 's,^\(/.*\):\( (.*)\)\?$,\1,p;d'|tr '\n' ' '`
69 test -z "$d" || sys_lib_dlsearch_path_spec=$d
73 dnl Probe for any options needed to enable C++11 support.
74 AX_CXX_COMPILE_STDCXX_11
76 dnl Run tests using the C++ compiler.
79 dnl Check for xapian-core.
81 [xapian-config]regexp(project_version,
82 [^\([0-9]*\.[0-9]*[13579]\)\..*$], [-\1]))
84 dnl We want XAPIAN_CXXFLAGS to be used for configure tests.
85 save_CXXFLAGS=$CXXFLAGS
86 CXXFLAGS="$CXXFLAGS $XAPIAN_CXXFLAGS"
87 dnl mingw (for instance) lacks ssize_t
94 dnl Check for perl (needed to generate some sources and documentation).
95 AC_PATH_PROG([PERL], [perl], [])
96 if test x$USE_MAINTAINER_MODE = xyes; then
97 test -z "$PERL" && AC_MSG_ERROR([perl is required in maintainer mode])
100 AC_ARG_ENABLE([documentation],
101 [AS_HELP_STRING([--enable-documentation], [enable make rules to rebuild documentation [default=maintainer-mode]])],
102 [case ${enableval} in
104 *) AC_MSG_ERROR([bad value ${enableval} for --enable-documentation]) ;;
106 [enable_documentation=$USE_MAINTAINER_MODE])
107 AM_CONDITIONAL([DOCUMENTATION_RULES], [test x"$enable_documentation" = xyes])
108 AM_CONDITIONAL([MAINTAINER_NO_DOCS], [test x"$USE_MAINTAINER_MODE$enable_documentation" = xyesno])
110 if test x"$enable_documentation" = xyes ; then
111 dnl Check for help2man. (Needed to make man pages from "--help" output).
112 AC_PATH_PROG([HELP2MAN], [help2man], [])
113 test -z "$HELP2MAN" && AC_MSG_ERROR([help2man is required to build documentation])
115 dnl Check for rst2html. (Needed to make HTML from reStructuredText format)
116 dnl Also look for rst2html.py, which archlinux reportedly installs it as.
117 AC_PATH_PROGS([RST2HTML], [rst2html rst2html.py], [])
118 test -z "$RST2HTML" && AC_MSG_ERROR([rst2html is required to build documentation (try package python-docutils)])
121 dnl Checks for header files.
122 AC_CHECK_HEADERS([fcntl.h limits.h sys/errno.h sys/select.h], [], [], [ ])
124 dnl libsvm is required.
125 AC_CHECK_HEADER([libsvm/svm.h], [], AC_MSG_ERROR([libsvm required but libsvm/svm.h not found]), [ ])
128 AC_SEARCH_LIBS([svm_train], [svm], [], AC_MSG_ERROR([libsvm required]))
131 AC_SUBST([LIBSVM_LIBS])
133 dnl Check that snprintf actually works as it's meant to.
135 dnl Linux 'man snprintf' warns:
136 dnl Linux libc4.[45] does not have a snprintf, but provides a libbsd that
137 dnl contains an snprintf equivalent to sprintf, i.e., one that ignores the
138 dnl size argument. Thus, the use of snprintf with early libc4 leads to
139 dnl serious security problems.
141 dnl It also warns that glibc < 2.0.6 (and presumably other pre-C90
142 dnl implementations) return -1 when truncating so check that we get the
143 dnl ISO C90 semantics for the returned length when truncating. If we
144 dnl have a working snprintf but with non-ISO return semantics, handle
145 dnl that case separately as it may still be useful in many cases.
147 dnl mingw has _snprintf so check for that too.
148 AC_MSG_CHECKING([for working ISO C90 conforming snprintf])
149 ac_cv_func_snprintf_noniso=no
150 for func in snprintf _snprintf ; do
158 dnl Return different exit status for each error so we can see which
159 dnl check failed by consulting config.log.
161 char buffer[4] = "abc";
162 int res1 = $func(buffer, 2, "%s", "XYZ");
163 if (memcmp(buffer, "X\0c", 4) != 0) return 2;
164 int res2 = $func(buffer, 2, "%x", 0x12);
165 if (memcmp(buffer, "1\0c", 4) != 0) return 3;
166 if (res1 == -1 && res2 == -1) return 15; /* Pre-ISO semantics. */
167 if (res1 != 3) return 4;
168 if (res2 != 2) return 5;
171 [ac_cv_func_snprintf=$func;break],
173 if test 15no = "$?$ac_cv_func_snprintf_noniso" ; then
174 ac_cv_func_snprintf_noniso=$func
176 ac_cv_func_snprintf=no
178 [ac_cv_func_snprintf=unknown;break]
181 AC_MSG_RESULT([$ac_cv_func_snprintf])
182 case $ac_cv_func_snprintf in
184 AC_MSG_CHECKING([for working non-ISO C90 conforming snprintf])
185 AC_MSG_RESULT([$ac_cv_func_snprintf_noniso])
186 if test no != "$ac_cv_func_snprintf_noniso" ; then
187 AC_DEFINE_UNQUOTED([SNPRINTF], [$ac_cv_func_snprintf_noniso],
188 [Define to the name of a function implementing snprintf but not caring about ISO C99 return value semantics (if one exists)])
192 dnl be conservative when crosscompiling
195 AC_DEFINE_UNQUOTED([SNPRINTF_ISO], [$ac_cv_func_snprintf],
196 [Define to the name of a function implementing snprintf with ISO C99 semantics (if one exists)])
197 AC_DEFINE_UNQUOTED([SNPRINTF], [$ac_cv_func_snprintf],
198 [Define to the name of a function implementing snprintf but not caring about ISO C99 return value semantics (if one exists)])
202 dnl ******************************
203 dnl * Set special compiler flags *
204 dnl ******************************
206 dnl Set flags to control warnings (enable more, or disable annoying ones).
208 if test yes = "$GXX"; then
209 dnl Intel's C++ compiler and clang both lie and define __GNUC__, so check which
210 dnl we actually have, as neither is really 100% compatible.
211 case `echo __INTEL_COMPILER __clang__|$CXX -E - 2>&AS_MESSAGE_LOG_FD|grep -v '^#'` in
212 *__INTEL_COMPILER*__clang__*)
213 dnl GCC (since neither substituted):
215 dnl -Wundef was supported by g++ 3.0 and -fshow-column by g++ 3.1.
217 dnl -Wlogical-op and -Wmissing-declarations (for C++) were added in
220 dnl All the other options were supported by g++ 2.95.
221 AM_CXXFLAGS="$AM_CXXFLAGS -fshow-column -Wall -W -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align -Wno-long-long -Wformat-security -fno-gnu-keywords -Wundef -Woverloaded-virtual -Wstrict-null-sentinel -Wshadow -Wstrict-overflow=1 -Wlogical-op -Wmissing-declarations"
223 dnl The exact format of g++ --version seems to change with almost every
224 dnl minor release so use the preprocessor macros which should be more
226 AC_MSG_CHECKING([for version of $CXX])
227 gxx_version=`echo __GNUC__.__GNUC_MINOR__.__GNUC_PATCHLEVEL__|$CXX -E -|sed '/^#/d;s/ //g'`
228 AC_MSG_RESULT([GCC $gxx_version])
231 [[0123]].*|4.[[0123]].*)
232 AC_MSG_ERROR([Xapian requires GCC 4.4 or later])
236 dnl -Wdouble-promotion was added in GCC 4.6.
238 dnl -Winit-self was added in GCC 3.4, but for GCC < 4.7 g++ always
239 dnl warns for this case with -Wuninitialized (implied by -W). We
240 dnl don't intend to use this idiom, so any instances are bugs we'd
241 dnl like to know about.
242 AM_CXXFLAGS="$AM_CXXFLAGS -Wdouble-promotion -Winit-self" ;;
246 dnl -Wconversion in older GCC versions is intended to help migration
247 dnl from K&R to ISO C, and isn't useful for us. In 4.3 it was renamed
248 dnl to -Wtraditional-conversion and a new -Wconversion added which
249 dnl sounds useful but is a bit buggy currently. So we should consider
250 dnl enabling -Wconversion once it is stabilised (GCC 4.4 or ...)
252 dnl -Wold-style-cast is interesting, but triggers for macros from
253 dnl system headers (e.g. FD_SET) (tested with GCC 4.4).
255 dnl Automatically add -Werror if maintainer mode is enabled.
256 if test x$USE_MAINTAINER_MODE = xyes; then
257 AM_CXXFLAGS="$AM_CXXFLAGS -Werror"
261 dnl Intel's compiler (since __clang__ not substituted):
263 dnl -w1 stops the avalanche of uninteresting "remark" messages.
264 dnl -wd... disables warnings which don't have good code workarounds.
265 AM_CXXFLAGS="$AM_CXXFLAGS -Wall -w1 -wd177,1572"
267 dnl Automatically add -Werror if maintainer mode is enabled.
268 if test x$USE_MAINTAINER_MODE = xyes; then
269 AM_CXXFLAGS="$AM_CXXFLAGS -Werror"
273 dnl clang (since __INTEL_COMPILER not substituted):
274 AM_CXXFLAGS="$AM_CXXFLAGS -Wall -W -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align -Wno-long-long -Wformat-security -fno-gnu-keywords -Wundef -Woverloaded-virtual"
275 AM_CXXFLAGS="$AM_CXXFLAGS -Wshadow -Wstrict-overflow=1 -Winit-self -Wmissing-declarations"
277 dnl Automatically add -Werror if maintainer mode is enabled.
278 if test x$USE_MAINTAINER_MODE = xyes; then
279 AM_CXXFLAGS="$AM_CXXFLAGS -Werror"
284 if test no != "$enable_visibility"; then
285 dnl GCC doesn't support symbol visibility on all platforms (e.g. it isn't
287 AC_MSG_CHECKING([if $CXX -fvisibility=hidden works])
288 if echo 'int bar() __attribute__((visibility("default"))); int foo() {return 42;}'|$CXX -Werror -fvisibility=hidden -c -oconftest.o -xc++ - >&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
290 AM_CXXFLAGS="$AM_CXXFLAGS -fvisibility=hidden"
291 dash_d_visibility=-DXAPIAN_ENABLE_VISIBILITY
297 dnl Not GCC, nor a compiler masquerading as GCC.
300 dnl +w turns on more warnings.
301 dnl +wlint turns on "lint-like" warnings.
302 dnl +W<n1>,<n2>,... suppresses warnings n1, n2, ...
303 dnl 2340 (remark) "value copied to temporary, reference to temporary
304 dnl use", in: throw Xapian::UnimplementedError("...");
305 dnl 2401 "destructor for base class ... is non-virtual" (we don't need a
306 dnl virtual destructor for intrusive_base, since we never delete
307 dnl its subclasses by a intrusive_base *).
308 dnl 3348 "declaration hides constant ..." which seems to misfire!
309 dnl 4255 (remark) "padding size of struct "..." with ... bytes to
310 dnl alignment boundary".
311 dnl 4273 "floating-point equality and inequality comparisons may be
312 dnl inappropriate due to roundoff common in floating-point computation"
313 dnl No obvious workaround for when you really do want == or !=.
314 dnl 4285 "operator= does not have a check for the source and destination
315 dnl addresses being non-identical" - fires for AutoPtr which
316 dnl includes such a check indirectly (internaltest's autoptr1 check this).
317 dnl 20201 "Memory leak is detected" which triggers for "return new Foo;"!
318 AM_CXXFLAGS="$AM_CXXFLAGS +w +wlint +W2340,2401,3348,4255,4273,4285,20201" ;;
323 [/* Disable stupid MSVC "performance" warning for converting int to bool. */
325 # pragma warning(disable:4800)
328 /* _FORTIFY_SOURCE is only supported by GCC >= 4.1 and glibc >= 2.3.4, but it
329 * shouldn't cause a problem to define it where it's not supported and some
330 * distros may have backported support, so hardcoding version checks is
331 * counter-productive.
333 * Check if _FORTIFY_SOURCE is already defined to allow the user to override
334 * our choice with "./configure CPPFLAGS=-D_FORTIFY_SOURCE=0" or "...=1".
336 #if defined __GNUC__ && !defined _FORTIFY_SOURCE
337 # define _FORTIFY_SOURCE 2
340 /* For GCC >= 3.0 (and Intel's C++ compiler, which also defines __GNUC__),
341 * we can use __builtin_expect to give the compiler hints about branch
342 * prediction. See HACKING for how to use these.
345 /* The arguments of __builtin_expect() are both long, so use !! to ensure that
346 * the first argument is always an integer expression, and always 0 or 1, but
347 * still has the same truth value for the if or while it is used in.
349 # define rare(COND) __builtin_expect(!!(COND), 0)
350 # define usual(COND) __builtin_expect(!!(COND), 1)
352 # define rare(COND) (COND)
353 # define usual(COND) (COND)
357 AC_SUBST([AM_CXXFLAGS])
359 dnl Restore CXXFLAGS to those the user specified or autoconf defaulted to.
360 CXXFLAGS=$save_CXXFLAGS
362 dnl Enable large file support if possible.
365 dnl Required for auto regeneration to work in a combined maintainer-mode tree.
366 : ${AUTOM4TE=autom4te}
369 dnl We want to be able to use GNU make % pattern rules in maintainer targets
370 dnl but automake warns these aren't portable, so we substitute the % to avoid
375 dnl **************************
376 dnl * Build the output files *
377 dnl **************************
383 AC_CONFIG_FILES([makemanpage], [chmod +x makemanpage])