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# $NetBSD: features-vars.mk,v 1.19 2008/06/14 08:55:58 joerg Exp $
#
# The platforms that are supported by pkgsrc differ in the amount of
# functions they provide in the C library (libc). Functions that are
# typically available on NetBSD are provided in the libnbcompat package.
#
# This file defines a set of "features" that some packages require.
# Whenever a package makes use of them, it should list the features in
# the USE_FEATURES variable. (It serves a similar purpose as USE_TOOLS.)
#
# The *.c files that use the features must be patched a little. When
# there are missing features, the C preprocessor macro HAVE_NBCOMPAT_H
# will be defined to 1. In this case, the headers from the nbcompat
# directory must be included.
#
# === Example ===
#
# In the package Makefile:
#
# USE_FEATURES= err
#
# In the C files using the err*() or warn*() functions:
#
# #if defined(HAVE_NBCOMPAT_H)
# #include <nbcompat/config.h> /* needed for the other headers */
# #include <nbcompat/cdefs.h> /* needed for the other headers */
# #include <nbcompat/err.h>
# #else
# #include <err.h>
# #endif
#
# === Package-settable variables ===
#
# USE_FEATURES
# Lists the system features required by the package.
#
# Possible:
# * asprintf: The functions asprintf and vasprintf.
# * err: The functions err, verr, errx, verrx.
# * warn: The functions warn, vwarn, warnx, vwarnx.
# * fts_close, fts_open, fts_read, fts_set: Functions
# for filesystem traversal.
# * getopt_long: The GNU version of getopt.
# * getprogname, setprogname
# * glob
# * regcomp
# * snprintf, vsnprintf
# * utimes
# * nbcompat: All of the above.
#
# Default value: undefined
#
# === Variables defined by this file ===
#
# MISSING_FEATURES
# The features listed in USE_FEATURES that are missing on the
# current system. Also includes "inet6" if the system doesn't
# support IPv6.
#
# Keywords: feature features asprintf vasprintf err errx warn warnx
# Keywords: fts fts_open fts_read fts_set fts_close getopt_long
# Keywords: getprogname setprogname glob regcomp setenv snprintf vsnprintf
# Keywords: utimes libnbcompat nbcompat
_VARGROUPS+= features
_USER_VARS.features= # none
_PKG_VARS.features= USE_FEATURES
_SYS_VARS.features= MISSING_FEATURES
MISSING_FEATURES= # empty
USE_FEATURES?= # none
#
# Handle "inet6" feature specially -- we always add it to
# MISSING_FEATURES if the operating system doesn't support IPv6,
# regardless of whether or not "inet6" is a requested feature
# in USE_FEATURES.
#
.if defined(_OPSYS_HAS_INET6) && !empty(_OPSYS_HAS_INET6:M[nN][oO])
MISSING_FEATURES+= inet6
.endif
.for f in ${_OPSYS_MISSING_FEATURES}
. if !empty(USE_FEATURES:M${f})
MISSING_FEATURES+= ${f}
. endif
.endfor
.for _feature_ in err warn
. if !empty(USE_FEATURES:M${_feature_})
. if (${OPSYS} != NetBSD) && (${OPSYS} != FreeBSD) && (${OPSYS} != DragonFly)
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.for _feature_ in fts_close fts_open fts_read fts_set
. if !empty(USE_FEATURES:M${_feature_})
. if !exists(/usr/include/fts.h)
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.for _feature_ in getopt_long
. if !empty(USE_FEATURES:M${_feature_})
. if !exists(/usr/include/getopt.h) || ${OPSYS} == "IRIX" || ${OPSYS} == "OSF1"
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.for _feature_ in getprogname setprogname
. if !empty(USE_FEATURES:M${_feature_})
. if (${OPSYS} != NetBSD) && (${OPSYS} != FreeBSD) && (${OPSYS} != DragonFly)
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.for _feature_ in glob
. if !empty(USE_FEATURES:M${_feature_})
. if !exists(/usr/include/glob.h)
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.for _feature_ in regcomp
. if !empty(USE_FEATURES:M${_feature_})
. if !exists(/usr/include/regex.h)
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.for _feature_ in setenv
. if !empty(USE_FEATURES:M${_feature_})
. if !empty(MACHINE_PLATFORM:MHPUX-11.11-hppa) # XXX too narrow?
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.for _feature_ in snprintf vsnprintf
. if !empty(USE_FEATURES:M${_feature_})
. if ${OPSYS} == "IRIX" || !empty(MACHINE_PLATFORM:MHPUX-11.11-hppa)
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.for _feature_ in utimes
. if !empty(USE_FEATURES:M${_feature_})
. if ${OPSYS} == "Interix"
MISSING_FEATURES+= ${_feature_}
. endif
. endif
.endfor
.if !empty(USE_FEATURES:Mnbcompat)
MISSING_FEATURES+= nbcompat
.endif
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