configure.ac - platform/external/flex - Git at Google

 #                                               -*- Autoconf -*-
 # Process this file with autoconf to produce a configure script.

 # This file is part of flex.

 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions
 # are met:

 # 1. Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 # 2. Redistributions in binary form must reproduce the above copyright
 # notice, this list of conditions and the following disclaimer in the
 # documentation and/or other materials provided with the distribution.

 # Neither the name of the University nor the names of its contributors
 # may be used to endorse or promote products derived from this software
 # without specific prior written permission.

 # THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 # IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 # WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 # PURPOSE.

 # autoconf requirements and initialization

 AC_INIT([the fast lexical analyser generator],[2.6.4],[flex-help@lists.sourceforge.net],[flex])
 AC_PREREQ([2.60])
 AC_CONFIG_SRCDIR([src/scan.l])
 AC_CONFIG_AUX_DIR([build-aux])
 AC_USE_SYSTEM_EXTENSIONS
 LT_INIT
 AM_INIT_AUTOMAKE([1.15 -Wno-portability foreign std-options dist-lzip parallel-tests subdir-objects])
 AC_CONFIG_HEADER([src/config.h])
 AC_CONFIG_LIBOBJ_DIR([lib])
 AC_CONFIG_MACRO_DIR([m4])
 SHARED_VERSION_INFO="2:0:0"
 AC_SUBST(SHARED_VERSION_INFO)

 # checks for programs

 AM_GNU_GETTEXT([external])
 AM_GNU_GETTEXT_VERSION([0.19.7])
 AC_PROG_YACC
 AS_IF([test "$YACC" != 'bison -y'], [
 	YACC="\${top_srcdir}/build-aux/missing bison -y"
 	AC_MSG_NOTICE(no bison program found: only required for maintainers)
 	])
 AM_CONDITIONAL([HAVE_BISON], [test "$YACC" = 'bison -y'])
 AM_PROG_LEX
 AC_PROG_CC
 AX_PROG_CC_FOR_BUILD
 AC_PROG_CXX
 AM_PROG_CC_C_O
 AC_PROG_LN_S
 AC_PROG_AWK
 AC_PROG_INSTALL

 pkgconfigdir=${libdir}/pkgconfig
 AC_SUBST(pkgconfigdir)

 # allow passing a variable `WARNINGFLAGS',
 #   either when invoking `configure', or when invoking `make'
 # default to something useful if GCC was detected

 AC_ARG_ENABLE([warnings],
   [AS_HELP_STRING([--enable-warnings],
                   [enable a bunch of compiler warning flags (defaults to GCC warning flags).])],
   [AS_IF([test "x$GCC" = xyes],
     [ : ${WARNINGFLAGS="-Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wnested-externs -Wold-style-definition -Wredundant-decls -Wconversion -Wno-unused-but-set-variable"} ])])

 AC_SUBST([WARNINGFLAGS])

 AC_ARG_ENABLE([libfl],
   [AS_HELP_STRING([--disable-libfl],
                   [do not build -lfl runtime support library])],
   [], [enable_libfl=yes])
 AM_CONDITIONAL([ENABLE_LIBFL], [test "x$enable_libfl" = xyes])

 # --disable-bootstrap is intended only to workaround problems with bootstrap
 # (e.g. when cross-compiling flex or when bootstrapping has bugs).
 # Ideally we should be able to bootstrap even when cross-compiling.
 AC_ARG_ENABLE([bootstrap],
   [AS_HELP_STRING([--disable-bootstrap],
                   [don't perform a bootstrap when building flex])],
   [], [enable_bootstrap=yes])
 AM_CONDITIONAL([ENABLE_BOOTSTRAP], [test "x$enable_bootstrap" = xyes])

 AM_CONDITIONAL([CROSS], [test "x$cross_compiling" = xyes])

 AC_PATH_PROG([HELP2MAN], help2man, [\${top_srcdir}/build-aux/missing help2man])
   AS_IF([test "$HELP2MAN" = "\${top_srcdir}/build-aux/missing help2man"],
     AC_MSG_WARN(help2man: program not found: building man page will not work)
   )

 AC_PATH_PROGS([TEXI2DVI], [gtexi2dvi texi2dvi], [\${top_srcdir}/build-aux/missing texi2dvi])
   AS_IF([test "$TEXI2DVI" = "\${top_srcdir}/build-aux/missing texi2dvi"],
     AC_MSG_WARN(texi2dvi: program not found: building pdf version of manual will not work)
   )

 # Check for a m4 that supports -P

 AC_CACHE_CHECK([for m4 that supports -P], [ac_cv_path_M4],
 [AC_PATH_PROGS_FEATURE_CHECK([M4], [gm4 gnum4 m4],
               [[m4out=`echo 'm''4_divnum' | $ac_path_M4 -P`]
                 [test "x$m4out" = x0 \
                 && ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:]],
               [AC_MSG_ERROR([could not find m4 that supports -P])])])
 AC_SUBST([M4], [$ac_cv_path_M4])
 AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the m4 executable name.])

 AC_PATH_PROG([INDENT], indent, [\${top_srcdir}/build-aux/missing indent])
   AC_MSG_CHECKING(if $INDENT is GNU indent)
   AS_IF([$INDENT --version 2>/dev/null | head -n 1 | grep "GNU indent" >/dev/null],
     [AC_MSG_RESULT(yes)],
     [AC_MSG_RESULT(no)
      AC_MSG_WARN($INDENT does not appear to be GNU indent; 'make indent' may not function properly)
     ])

 # checks for headers

 AC_CHECK_HEADERS([regex.h strings.h sys/stat.h sys/wait.h unistd.h], [],
   [AC_MSG_ERROR(required header not found on your system)])

 AC_CHECK_HEADERS([inttypes.h libintl.h limits.h locale.h malloc.h netinet/in.h])

 # checks for libraries

 # The test test-pthread uses libpthread, so we check for it here, but
 # all we need is the preprocessor symbol defined since we don't need
 # LIBS to include libpthread for building flex.

 LIBPTHREAD=''
 AC_CHECK_LIB(pthread, pthread_mutex_lock,
    [AC_CHECK_HEADERS([pthread.h], [LIBPTHREAD=-lpthread],
       [AC_MSG_WARN([pthread tests will be skipped])])],
    [AC_MSG_WARN([pthread tests will be skipped])])
 AC_SUBST([LIBPTHREAD])

 AC_CHECK_LIB(m, log10)

 # Checks for typedefs, structures, and compiler characteristics.

 AC_HEADER_STDBOOL
 AC_C_CONST
 AC_TYPE_SIZE_T

 # Checks for library functions.

 AC_FUNC_ALLOCA
 AC_FUNC_FORK
 dnl Autoconf bug: AC_FUNC_MALLOC and AC_FUNC_REALLOC might not warn of cross
 dnl compilation. Workaround this.
 AC_FUNC_MALLOC
 AS_IF([test "$cross_compiling" = yes],
    AC_MSG_WARN([result $ac_cv_func_malloc_0_nonnull guessed because of cross compilation]))
 AC_FUNC_REALLOC
 AS_IF([test "$cross_compiling" = yes],
    AC_MSG_WARN([result $ac_cv_func_realloc_0_nonnull guessed because of cross compilation]))

 dnl Autoheader (<= 2.69) bug: "dnl" comments in a quoted argument of
 dnl AC_CHECK_FUNCS will expand wierdly in config.h.in.
 dnl (https://lists.gnu.org/archive/html/bug-autoconf/2018-02/msg00005.html)

 AC_CHECK_FUNCS([dup2 memset regcomp strcasecmp strchr strdup strtol], [],
   [AC_MSG_ERROR(required library function not found on your system)])

 # Optional library functions:
 # pow - Used only by "examples/manual/expr".
 # setlocale - Needed only if NLS is enabled.
 # reallocarr - NetBSD function. Use reallocarray if not available.
 # reallocarray - OpenBSD function. We have replacement if not available.
 AC_CHECK_FUNCS([pow setlocale reallocarr reallocarray])

 AC_CONFIG_FILES(
 Makefile
 doc/Makefile
 examples/Makefile
 examples/fastwc/Makefile
 examples/manual/Makefile
 po/Makefile.in
 src/libfl.pc
 src/Makefile
 tools/Makefile
 tests/Makefile
 )

 AC_OUTPUT
	# -- Autoconf --
	# Process this file with autoconf to produce a configure script.

	# This file is part of flex.

	# Redistribution and use in source and binary forms, with or without
	# modification, are permitted provided that the following conditions
	# are met:

	# 1. Redistributions of source code must retain the above copyright
	# notice, this list of conditions and the following disclaimer.
	# 2. Redistributions in binary form must reproduce the above copyright
	# notice, this list of conditions and the following disclaimer in the
	# documentation and/or other materials provided with the distribution.

	# Neither the name of the University nor the names of its contributors
	# may be used to endorse or promote products derived from this software
	# without specific prior written permission.

	# THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
	# IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
	# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	# PURPOSE.

	# autoconf requirements and initialization

	AC_INIT([the fast lexical analyser generator],[2.6.4],[flex-help@lists.sourceforge.net],[flex])
	AC_PREREQ([2.60])
	AC_CONFIG_SRCDIR([src/scan.l])
	AC_CONFIG_AUX_DIR([build-aux])
	AC_USE_SYSTEM_EXTENSIONS
	LT_INIT
	AM_INIT_AUTOMAKE([1.15 -Wno-portability foreign std-options dist-lzip parallel-tests subdir-objects])
	AC_CONFIG_HEADER([src/config.h])
	AC_CONFIG_LIBOBJ_DIR([lib])
	AC_CONFIG_MACRO_DIR([m4])
	SHARED_VERSION_INFO="2:0:0"
	AC_SUBST(SHARED_VERSION_INFO)

	# checks for programs

	AM_GNU_GETTEXT([external])
	AM_GNU_GETTEXT_VERSION([0.19.7])
	AC_PROG_YACC
	AS_IF([test "$YACC" != 'bison -y'], [
	YACC="\${top_srcdir}/build-aux/missing bison -y"
	AC_MSG_NOTICE(no bison program found: only required for maintainers)
	])
	AM_CONDITIONAL([HAVE_BISON], [test "$YACC" = 'bison -y'])
	AM_PROG_LEX
	AC_PROG_CC
	AX_PROG_CC_FOR_BUILD
	AC_PROG_CXX
	AM_PROG_CC_C_O
	AC_PROG_LN_S
	AC_PROG_AWK
	AC_PROG_INSTALL

	pkgconfigdir=${libdir}/pkgconfig
	AC_SUBST(pkgconfigdir)

	# allow passing a variable `WARNINGFLAGS',
	# either when invoking `configure', or when invoking `make'
	# default to something useful if GCC was detected

	AC_ARG_ENABLE([warnings],
	[AS_HELP_STRING([--enable-warnings],
	[enable a bunch of compiler warning flags (defaults to GCC warning flags).])],
	[AS_IF([test "x$GCC" = xyes],
	[ : ${WARNINGFLAGS="-Wall -Wextra -Wmissing-prototypes -Wstrict-prototypes -Wnested-externs -Wold-style-definition -Wredundant-decls -Wconversion -Wno-unused-but-set-variable"} ])])

	AC_SUBST([WARNINGFLAGS])

	AC_ARG_ENABLE([libfl],
	[AS_HELP_STRING([--disable-libfl],
	[do not build -lfl runtime support library])],
	[], [enable_libfl=yes])
	AM_CONDITIONAL([ENABLE_LIBFL], [test "x$enable_libfl" = xyes])

	# --disable-bootstrap is intended only to workaround problems with bootstrap
	# (e.g. when cross-compiling flex or when bootstrapping has bugs).
	# Ideally we should be able to bootstrap even when cross-compiling.
	AC_ARG_ENABLE([bootstrap],
	[AS_HELP_STRING([--disable-bootstrap],
	[don't perform a bootstrap when building flex])],
	[], [enable_bootstrap=yes])
	AM_CONDITIONAL([ENABLE_BOOTSTRAP], [test "x$enable_bootstrap" = xyes])

	AM_CONDITIONAL([CROSS], [test "x$cross_compiling" = xyes])

	AC_PATH_PROG([HELP2MAN], help2man, [\${top_srcdir}/build-aux/missing help2man])
	AS_IF([test "$HELP2MAN" = "\${top_srcdir}/build-aux/missing help2man"],
	AC_MSG_WARN(help2man: program not found: building man page will not work)
	)

	AC_PATH_PROGS([TEXI2DVI], [gtexi2dvi texi2dvi], [\${top_srcdir}/build-aux/missing texi2dvi])
	AS_IF([test "$TEXI2DVI" = "\${top_srcdir}/build-aux/missing texi2dvi"],
	AC_MSG_WARN(texi2dvi: program not found: building pdf version of manual will not work)
	)

	# Check for a m4 that supports -P

	AC_CACHE_CHECK([for m4 that supports -P], [ac_cv_path_M4],
	[AC_PATH_PROGS_FEATURE_CHECK([M4], [gm4 gnum4 m4],
	[[m4out=`echo 'm''4_divnum' \| $ac_path_M4 -P`]
	[test "x$m4out" = x0 \
	&& ac_cv_path_M4=$ac_path_M4 ac_path_M4_found=:]],
	[AC_MSG_ERROR([could not find m4 that supports -P])])])
	AC_SUBST([M4], [$ac_cv_path_M4])
	AC_DEFINE_UNQUOTED([M4], ["$M4"], [Define to the m4 executable name.])

	AC_PATH_PROG([INDENT], indent, [\${top_srcdir}/build-aux/missing indent])
	AC_MSG_CHECKING(if $INDENT is GNU indent)
	AS_IF([$INDENT --version 2>/dev/null \| head -n 1 \| grep "GNU indent" >/dev/null],
	[AC_MSG_RESULT(yes)],
	[AC_MSG_RESULT(no)
	AC_MSG_WARN($INDENT does not appear to be GNU indent; 'make indent' may not function properly)
	])

	# checks for headers

	AC_CHECK_HEADERS([regex.h strings.h sys/stat.h sys/wait.h unistd.h], [],
	[AC_MSG_ERROR(required header not found on your system)])

	AC_CHECK_HEADERS([inttypes.h libintl.h limits.h locale.h malloc.h netinet/in.h])

	# checks for libraries

	# The test test-pthread uses libpthread, so we check for it here, but
	# all we need is the preprocessor symbol defined since we don't need
	# LIBS to include libpthread for building flex.

	LIBPTHREAD=''
	AC_CHECK_LIB(pthread, pthread_mutex_lock,
	[AC_CHECK_HEADERS([pthread.h], [LIBPTHREAD=-lpthread],
	[AC_MSG_WARN([pthread tests will be skipped])])],
	[AC_MSG_WARN([pthread tests will be skipped])])
	AC_SUBST([LIBPTHREAD])

	AC_CHECK_LIB(m, log10)

	# Checks for typedefs, structures, and compiler characteristics.

	AC_HEADER_STDBOOL
	AC_C_CONST
	AC_TYPE_SIZE_T

	# Checks for library functions.

	AC_FUNC_ALLOCA
	AC_FUNC_FORK
	dnl Autoconf bug: AC_FUNC_MALLOC and AC_FUNC_REALLOC might not warn of cross
	dnl compilation. Workaround this.
	AC_FUNC_MALLOC
	AS_IF([test "$cross_compiling" = yes],
	AC_MSG_WARN([result $ac_cv_func_malloc_0_nonnull guessed because of cross compilation]))
	AC_FUNC_REALLOC
	AS_IF([test "$cross_compiling" = yes],
	AC_MSG_WARN([result $ac_cv_func_realloc_0_nonnull guessed because of cross compilation]))

	dnl Autoheader (<= 2.69) bug: "dnl" comments in a quoted argument of
	dnl AC_CHECK_FUNCS will expand wierdly in config.h.in.
	dnl (https://lists.gnu.org/archive/html/bug-autoconf/2018-02/msg00005.html)

	AC_CHECK_FUNCS([dup2 memset regcomp strcasecmp strchr strdup strtol], [],
	[AC_MSG_ERROR(required library function not found on your system)])

	# Optional library functions:
	# pow - Used only by "examples/manual/expr".
	# setlocale - Needed only if NLS is enabled.
	# reallocarr - NetBSD function. Use reallocarray if not available.
	# reallocarray - OpenBSD function. We have replacement if not available.
	AC_CHECK_FUNCS([pow setlocale reallocarr reallocarray])

	AC_CONFIG_FILES(
	Makefile
	doc/Makefile
	examples/Makefile
	examples/fastwc/Makefile
	examples/manual/Makefile
	po/Makefile.in
	src/libfl.pc
	src/Makefile
	tools/Makefile
	tests/Makefile
	)

	AC_OUTPUT