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 dnl Where xapian-letor.h, etc go. In development release append "/xapian-1.3".
38 dnl incdir=$includedir
39 incdir=$includedir/xapian-1.3
42 AM_INIT_AUTOMAKE([1.10.1 -Wportability tar-ustar])
44 AC_CONFIG_SRCDIR([api/letor.cc])
46 AC_CONFIG_HEADERS([config.h])
48 AC_CONFIG_MACRO_DIR([m4])
53 dnl disable "maintainer only" rules by default
56 dnl Checks for programs.
61 # Checked: freebsd8.0 openbsd4.6 solaris2.9 solaris2.10
63 linux* | k*bsd*-gnu | freebsd* | openbsd* | solaris*)
64 dnl Vanilla libtool sets this to "unknown" which it then handles as "yes".
65 link_all_deplibs_CXX=no
71 dnl Extract search path from ldconfig which is more reliable than the way
72 dnl vanilla libtool extracts them from ld.so.conf.
73 d=`/sbin/ldconfig -N -X -v 2>&AS_MESSAGE_LOG_FD|$SED 's,^\(/.*\):\( (.*)\)\?$,\1,p;d'|tr '\n' ' '`
74 test -z "$d" || sys_lib_dlsearch_path_spec=$d
78 dnl Probe for any options needed to enable C++11 support.
79 AX_CXX_COMPILE_STDCXX_11
81 dnl Run tests using the C++ compiler.
84 dnl Check for xapian-core.
86 [xapian-config]regexp(project_version,
87 [^\([0-9]*\.[0-9]*[13579]\)\..*$], [-\1]))
89 dnl We want XAPIAN_CXXFLAGS to be used for configure tests.
90 save_CXXFLAGS=$CXXFLAGS
91 CXXFLAGS="$CXXFLAGS $XAPIAN_CXXFLAGS"
92 dnl mingw (for instance) lacks ssize_t
99 dnl Check for perl (needed to generate some sources and documentation).
100 AC_PATH_PROG([PERL], [perl], [])
101 if test x$USE_MAINTAINER_MODE = xyes; then
102 test -z "$PERL" && AC_MSG_ERROR([perl is required in maintainer mode])
105 AC_ARG_ENABLE([documentation],
106 [AS_HELP_STRING([--enable-documentation], [enable make rules to rebuild documentation [default=maintainer-mode]])],
107 [case ${enableval} in
109 *) AC_MSG_ERROR([bad value ${enableval} for --enable-documentation]) ;;
111 [enable_documentation=$USE_MAINTAINER_MODE])
112 AM_CONDITIONAL([DOCUMENTATION_RULES], [test x"$enable_documentation" = xyes])
113 AM_CONDITIONAL([MAINTAINER_NO_DOCS], [test x"$USE_MAINTAINER_MODE$enable_documentation" = xyesno])
115 if test x"$enable_documentation" = xyes ; then
116 dnl Check for help2man. (Needed to make man pages from "--help" output).
117 AC_PATH_PROG([HELP2MAN], [help2man], [])
118 test -z "$HELP2MAN" && AC_MSG_ERROR([help2man is required to build documentation])
120 dnl Check for rst2html. (Needed to make HTML from reStructuredText format)
121 dnl Also look for rst2html.py, which archlinux reportedly installs it as.
122 AC_PATH_PROGS([RST2HTML], [rst2html rst2html.py], [])
123 test -z "$RST2HTML" && AC_MSG_ERROR([rst2html is required to build documentation (try package python-docutils)])
126 dnl Checks for header files.
127 AC_CHECK_HEADERS([fcntl.h limits.h sys/errno.h sys/select.h], [], [], [ ])
129 dnl libsvm is required.
130 AC_CHECK_HEADER([libsvm/svm.h], [], AC_MSG_ERROR([libsvm required but libsvm/svm.h not found]), [ ])
133 AC_SEARCH_LIBS([svm_train], [svm], [], AC_MSG_ERROR([libsvm required]))
136 AC_SUBST([LIBSVM_LIBS])
138 dnl Check that snprintf actually works as it's meant to.
140 dnl Linux 'man snprintf' warns:
141 dnl Linux libc4.[45] does not have a snprintf, but provides a libbsd that
142 dnl contains an snprintf equivalent to sprintf, i.e., one that ignores the
143 dnl size argument. Thus, the use of snprintf with early libc4 leads to
144 dnl serious security problems.
146 dnl It also warns that glibc < 2.0.6 (and presumably other pre-C90
147 dnl implementations) return -1 when truncating so check that we get the
148 dnl ISO C90 semantics for the returned length when truncating. If we
149 dnl have a working snprintf but with non-ISO return semantics, handle
150 dnl that case separately as it may still be useful in many cases.
152 dnl mingw has _snprintf so check for that too.
153 AC_MSG_CHECKING([for working ISO C90 conforming snprintf])
154 ac_cv_func_snprintf_noniso=no
155 for func in snprintf _snprintf ; do
163 dnl Return different exit status for each error so we can see which
164 dnl check failed by consulting config.log.
166 char buffer[4] = "abc";
167 int res1 = $func(buffer, 2, "%s", "XYZ");
168 if (memcmp(buffer, "X\0c", 4) != 0) return 2;
169 int res2 = $func(buffer, 2, "%x", 0x12);
170 if (memcmp(buffer, "1\0c", 4) != 0) return 3;
171 if (res1 == -1 && res2 == -1) return 15; /* Pre-ISO semantics. */
172 if (res1 != 3) return 4;
173 if (res2 != 2) return 5;
176 [ac_cv_func_snprintf=$func;break],
178 if test 15no = "$?$ac_cv_func_snprintf_noniso" ; then
179 ac_cv_func_snprintf_noniso=$func
181 ac_cv_func_snprintf=no
183 [ac_cv_func_snprintf=unknown;break]
186 AC_MSG_RESULT([$ac_cv_func_snprintf])
187 case $ac_cv_func_snprintf in
189 AC_MSG_CHECKING([for working non-ISO C90 conforming snprintf])
190 AC_MSG_RESULT([$ac_cv_func_snprintf_noniso])
191 if test no != "$ac_cv_func_snprintf_noniso" ; then
192 AC_DEFINE_UNQUOTED([SNPRINTF], [$ac_cv_func_snprintf_noniso],
193 [Define to the name of a function implementing snprintf but not caring about ISO C99 return value semantics (if one exists)])
197 dnl be conservative when crosscompiling
200 AC_DEFINE_UNQUOTED([SNPRINTF_ISO], [$ac_cv_func_snprintf],
201 [Define to the name of a function implementing snprintf with ISO C99 semantics (if one exists)])
202 AC_DEFINE_UNQUOTED([SNPRINTF], [$ac_cv_func_snprintf],
203 [Define to the name of a function implementing snprintf but not caring about ISO C99 return value semantics (if one exists)])
207 dnl ******************************
208 dnl * Set special compiler flags *
209 dnl ******************************
211 dnl Set flags to control warnings (enable more, or disable annoying ones).
213 if test yes = "$GXX"; then
214 dnl Intel's C++ compiler and clang both lie and define __GNUC__, so check which
215 dnl we actually have, as neither is really 100% compatible.
216 case `echo __INTEL_COMPILER __clang__|$CXX -E - 2>&AS_MESSAGE_LOG_FD|grep -v '^#'` in
217 *__INTEL_COMPILER*__clang__*)
218 dnl GCC (since neither substituted):
220 dnl -Wundef was supported by g++ 3.0.
222 dnl -Wlogical-op and -Wmissing-declarations (for C++) were added in
225 dnl All the other options were supported by g++ 2.95.
226 AM_CXXFLAGS="$AM_CXXFLAGS -Wall -W -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align -Wformat-security -fno-gnu-keywords -Wundef -Woverloaded-virtual -Wstrict-null-sentinel -Wshadow -Wstrict-overflow=1 -Wlogical-op -Wmissing-declarations"
228 dnl The exact format of g++ --version seems to change with almost every
229 dnl minor release so use the preprocessor macros which should be more
231 AC_MSG_CHECKING([for version of $CXX])
232 gxx_version=`echo __GNUC__.__GNUC_MINOR__.__GNUC_PATCHLEVEL__|$CXX -E -|sed '/^#/d;s/ //g'`
233 AC_MSG_RESULT([GCC $gxx_version])
236 [[0123]].*|4.[[0123]].*)
237 AC_MSG_ERROR([Xapian requires GCC 4.4 or later])
241 dnl -Wdouble-promotion was added in GCC 4.6.
243 dnl -Winit-self was added in GCC 3.4, but for GCC < 4.7 g++ always
244 dnl warns for this case with -Wuninitialized (implied by -W). We
245 dnl don't intend to use this idiom, so any instances are bugs we'd
246 dnl like to know about.
247 AM_CXXFLAGS="$AM_CXXFLAGS -Wdouble-promotion -Winit-self" ;;
251 dnl -Wconversion in older GCC versions is intended to help migration
252 dnl from K&R to ISO C, and isn't useful for us. In 4.3 it was renamed
253 dnl to -Wtraditional-conversion and a new -Wconversion added which
254 dnl sounds useful but is a bit buggy currently. So we should consider
255 dnl enabling -Wconversion once it is stabilised (GCC 4.4 or ...)
257 dnl -Wold-style-cast is interesting, but triggers for macros from
258 dnl system headers (e.g. FD_SET) (tested with GCC 4.4).
260 dnl Automatically add -Werror if maintainer mode is enabled.
261 if test x$USE_MAINTAINER_MODE = xyes; then
262 AM_CXXFLAGS="$AM_CXXFLAGS -Werror"
266 dnl Intel's compiler (since __clang__ not substituted):
268 dnl -w1 stops the avalanche of uninteresting "remark" messages.
269 dnl -wd... disables warnings which don't have good code workarounds.
270 AM_CXXFLAGS="$AM_CXXFLAGS -Wall -w1 -wd177,1572"
272 dnl Automatically add -Werror if maintainer mode is enabled.
273 if test x$USE_MAINTAINER_MODE = xyes; then
274 AM_CXXFLAGS="$AM_CXXFLAGS -Werror"
278 dnl clang (since __INTEL_COMPILER not substituted):
279 AM_CXXFLAGS="$AM_CXXFLAGS -Wall -W -Wredundant-decls -Wpointer-arith -Wcast-qual -Wcast-align -Wformat-security -fno-gnu-keywords -Wundef -Woverloaded-virtual"
280 AM_CXXFLAGS="$AM_CXXFLAGS -Wshadow -Wstrict-overflow=1 -Winit-self -Wmissing-declarations"
282 dnl Automatically add -Werror if maintainer mode is enabled.
283 if test x$USE_MAINTAINER_MODE = xyes; then
284 AM_CXXFLAGS="$AM_CXXFLAGS -Werror"
289 if test no != "$enable_visibility"; then
290 dnl GCC doesn't support symbol visibility on all platforms (e.g. it isn't
292 AC_MSG_CHECKING([if $CXX -fvisibility=hidden works])
293 if echo 'int bar() __attribute__((visibility("default"))); int foo() {return 42;}'|$CXX -Werror -fvisibility=hidden -c -oconftest.o -xc++ - >&AS_MESSAGE_LOG_FD 2>&AS_MESSAGE_LOG_FD ; then
295 AM_CXXFLAGS="$AM_CXXFLAGS -fvisibility=hidden"
296 dash_d_visibility=-DXAPIAN_ENABLE_VISIBILITY
302 dnl Not GCC, nor a compiler masquerading as GCC.
305 dnl +w turns on more warnings.
306 dnl +wlint turns on "lint-like" warnings.
307 dnl +W<n1>,<n2>,... suppresses warnings n1, n2, ...
308 dnl 2340 (remark) "value copied to temporary, reference to temporary
309 dnl use", in: throw Xapian::UnimplementedError("...");
310 dnl 2401 "destructor for base class ... is non-virtual" (we don't need a
311 dnl virtual destructor for intrusive_base, since we never delete
312 dnl its subclasses by a intrusive_base *).
313 dnl 3348 "declaration hides constant ..." which seems to misfire!
314 dnl 4255 (remark) "padding size of struct "..." with ... bytes to
315 dnl alignment boundary".
316 dnl 4273 "floating-point equality and inequality comparisons may be
317 dnl inappropriate due to roundoff common in floating-point computation"
318 dnl No obvious workaround for when you really do want == or !=.
319 dnl 4285 "operator= does not have a check for the source and destination
320 dnl addresses being non-identical" - fires for AutoPtr which
321 dnl includes such a check indirectly (internaltest's autoptr1 check this).
322 dnl 20201 "Memory leak is detected" which triggers for "return new Foo;"!
323 AM_CXXFLAGS="$AM_CXXFLAGS +w +wlint +W2340,2401,3348,4255,4273,4285,20201" ;;
328 [/* Disable stupid MSVC "performance" warning for converting int to bool. */
330 # pragma warning(disable:4800)
333 /* _FORTIFY_SOURCE is only supported by GCC >= 4.1 and glibc >= 2.3.4, but it
334 * shouldn't cause a problem to define it where it's not supported and some
335 * distros may have backported support, so hardcoding version checks is
336 * counter-productive.
338 * Check if _FORTIFY_SOURCE is already defined to allow the user to override
339 * our choice with "./configure CPPFLAGS=-D_FORTIFY_SOURCE=0" or "...=1".
341 #if defined __GNUC__ && !defined _FORTIFY_SOURCE
342 # define _FORTIFY_SOURCE 2
345 /* For GCC >= 3.0 (and Intel's C++ compiler, which also defines __GNUC__),
346 * we can use __builtin_expect to give the compiler hints about branch
347 * prediction. See HACKING for how to use these.
350 /* The arguments of __builtin_expect() are both long, so use !! to ensure that
351 * the first argument is always an integer expression, and always 0 or 1, but
352 * still has the same truth value for the if or while it is used in.
354 # define rare(COND) __builtin_expect(!!(COND), 0)
355 # define usual(COND) __builtin_expect(!!(COND), 1)
357 # define rare(COND) (COND)
358 # define usual(COND) (COND)
362 AC_SUBST([AM_CXXFLAGS])
364 dnl Restore CXXFLAGS to those the user specified or autoconf defaulted to.
365 CXXFLAGS=$save_CXXFLAGS
367 dnl Enable large file support if possible.
370 dnl Required for auto regeneration to work in a combined maintainer-mode tree.
371 : ${AUTOM4TE=autom4te}
374 dnl We want to be able to use GNU make % pattern rules in maintainer targets
375 dnl but automake warns these aren't portable, so we substitute the % to avoid
380 dnl **************************
381 dnl * Build the output files *
382 dnl **************************
388 AC_CONFIG_FILES([makemanpage], [chmod +x makemanpage])