2 # Process this file with autoconf to produce a configure script.
4 # This file is part of flex.
6 # Redistribution and use in source and binary forms, with or without
7 # modification, are permitted provided that the following conditions
10 # 1. Redistributions of source code must retain the above copyright
11 # notice, this list of conditions and the following disclaimer.
12 # 2. Redistributions in binary form must reproduce the above copyright
13 # notice, this list of conditions and the following disclaimer in the
14 # documentation and/or other materials provided with the distribution.
16 # Neither the name of the University nor the names of its contributors
17 # may be used to endorse or promote products derived from this software
18 # without specific prior written permission.
20 # THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
21 # IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
22 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
25 # autoconf requirements and initialization
27 AC_INIT([the fast lexical analyser generator],[2.6.4],[flex-help@lists.sourceforge.net],[flex])
29 AC_CONFIG_SRCDIR([src/scan.l])
30 AC_CONFIG_AUX_DIR([build-aux])
31 AC_USE_SYSTEM_EXTENSIONS
33 AM_INIT_AUTOMAKE([1.15 -Wno-portability foreign std-options dist-lzip parallel-tests subdir-objects])
34 AC_CONFIG_HEADER([src/config.h])
35 AC_CONFIG_LIBOBJ_DIR([lib])
36 AC_CONFIG_MACRO_DIR([m4])
37 SHARED_VERSION_INFO="2:0:0"
38 AC_SUBST(SHARED_VERSION_INFO)
42 AM_GNU_GETTEXT([external])
43 AM_GNU_GETTEXT_VERSION([0.19.7])
45 AS_IF([test "$YACC" != 'bison -y'], [
46 YACC="\${top_srcdir}/build-aux/missing bison -y"
47 AC_MSG_NOTICE(no bison program found: only required for maintainers)
49 AM_CONDITIONAL([HAVE_BISON], [test "$YACC" = 'bison -y'])
59 pkgconfigdir=${libdir}/pkgconfig
60 AC_SUBST(pkgconfigdir)
62 # allow passing a variable `WARNINGFLAGS',
63 # either when invoking `configure', or when invoking `make'
64 # default to something useful if GCC was detected
66 AC_ARG_ENABLE([warnings],
67 [AS_HELP_STRING([--enable-warnings],
68 [enable a bunch of compiler warning flags (defaults to GCC warning flags).])],
69 [AS_IF([test "x$GCC" = xyes],
70 [ : ${WARNINGFLAGS="-Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wnested-externs -Wold-style-definition -Wredundant-decls -Wconversion -Wno-unused-but-set-variable"} ])])
72 AC_SUBST([WARNINGFLAGS])
74 AC_ARG_ENABLE([libfl],
75 [AS_HELP_STRING([--disable-libfl],
76 [do not build -lfl runtime support library])],
77 [], [enable_libfl=yes])
78 AM_CONDITIONAL([ENABLE_LIBFL], [test "x$enable_libfl" = xyes])
80 # --disable-bootstrap is intended only to workaround problems with bootstrap
81 # (e.g. when cross-compiling flex or when bootstrapping has bugs).
82 # Ideally we should be able to bootstrap even when cross-compiling.
83 AC_ARG_ENABLE([bootstrap],
84 [AS_HELP_STRING([--disable-bootstrap],
85 [don't perform a bootstrap when building flex])],
86 [], [enable_bootstrap=yes])
87 AM_CONDITIONAL([ENABLE_BOOTSTRAP], [test "x$enable_bootstrap" = xyes])
89 AM_CONDITIONAL([CROSS], [test "x$cross_compiling" = xyes])
91 AC_PATH_PROG([HELP2MAN], help2man, [\${top_srcdir}/build-aux/missing help2man])
92 AS_IF([test "$HELP2MAN" = "\${top_srcdir}/build-aux/missing help2man"],
93 AC_MSG_WARN(help2man: program not found: building man page will not work)
96 AC_PATH_PROGS([TEXI2DVI], [gtexi2dvi texi2dvi], [\${top_srcdir}/build-aux/missing texi2dvi])
97 AS_IF([test "$TEXI2DVI" = "\${top_srcdir}/build-aux/missing texi2dvi"],
98 AC_MSG_WARN(texi2dvi: program not found: building pdf version of manual will not work)
101 # Check for a m4 that supports -P
103 AC_CACHE_CHECK([for m4 that supports -P], [ac_cv_path_M4],
104 [AC_PATH_PROGS_FEATURE_CHECK([M4], [gm4 gnum4 m4],
105 [[m4out=`echo 'm''4_divnum' | $ac_path_M4 -P`]
106 [test "x$m4out" = x0 \
107 && ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:]],
108 [AC_MSG_ERROR([could not find m4 that supports -P])])])
109 AC_SUBST([M4], [$ac_cv_path_M4])
110 AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the m4 executable name.])
112 AC_PATH_PROG([INDENT], indent, [\${top_srcdir}/build-aux/missing indent])
113 AC_MSG_CHECKING(if $INDENT is GNU indent)
114 AS_IF([$INDENT --version 2>/dev/null | head -n 1 | grep "GNU indent" >/dev/null],
115 [AC_MSG_RESULT(yes)],
117 AC_MSG_WARN($INDENT does not appear to be GNU indent; 'make indent' may not function properly)
122 AC_CHECK_HEADERS([regex.h strings.h sys/stat.h sys/wait.h unistd.h], [],
123 [AC_MSG_ERROR(required header not found on your system)])
125 AC_CHECK_HEADERS([inttypes.h libintl.h limits.h locale.h malloc.h netinet/in.h])
127 # checks for libraries
129 # The test test-pthread uses libpthread, so we check for it here, but
130 # all we need is the preprocessor symbol defined since we don't need
131 # LIBS to include libpthread for building flex.
134 AC_CHECK_LIB(pthread, pthread_mutex_lock,
135 [AC_CHECK_HEADERS([pthread.h], [LIBPTHREAD=-lpthread],
136 [AC_MSG_WARN([pthread tests will be skipped])])],
137 [AC_MSG_WARN([pthread tests will be skipped])])
138 AC_SUBST([LIBPTHREAD])
140 AC_CHECK_LIB(m, log10)
142 # Checks for typedefs, structures, and compiler characteristics.
148 # Checks for library functions.
152 dnl Autoconf bug: AC_FUNC_MALLOC and AC_FUNC_REALLOC might not warn of cross
153 dnl compilation. Workaround this.
155 AS_IF([test "$cross_compiling" = yes],
156 AC_MSG_WARN([result $ac_cv_func_malloc_0_nonnull guessed because of cross compilation]))
158 AS_IF([test "$cross_compiling" = yes],
159 AC_MSG_WARN([result $ac_cv_func_realloc_0_nonnull guessed because of cross compilation]))
161 dnl Autoheader (<= 2.69) bug: "dnl" comments in a quoted argument of
162 dnl AC_CHECK_FUNCS will expand wierdly in config.h.in.
163 dnl (https://lists.gnu.org/archive/html/bug-autoconf/2018-02/msg00005.html)
165 AC_CHECK_FUNCS([dup2 memset regcomp strcasecmp strchr strdup strtol], [],
166 [AC_MSG_ERROR(required library function not found on your system)])
168 # Optional library functions:
169 # pow - Used only by "examples/manual/expr".
170 # setlocale - Needed only if NLS is enabled.
171 # reallocarr - NetBSD function. Use reallocarray if not available.
172 # reallocarray - OpenBSD function. We have replacement if not available.
173 AC_CHECK_FUNCS([pow setlocale reallocarr reallocarray])
179 examples/fastwc/Makefile
180 examples/manual/Makefile