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# This file is part of UltraStar Deluxe
# Created by the UltraStar Deluxe Team
# OVERVIEW
#
# PKG_VALUE(VARIABLE_PREFIX, POSTFIX, COMMAND, MODULE, HELP-STRING)
# PKG_VERSION(VARIABLE_PREFIX, MODULE)
# PKG_HAVE(VARIABLE_PREFIX, MODULE, [REQUIRED])
# AX_TRIM(STRING)
# SYNOPSIS
#
# PKG_VALUE(VARIABLE_PREFIX, POSTFIX, COMMAND, MODULE, HELP-STRING)
#
# DESCRIPTION
#
# Calls pkg-config with a given command and stores the result.
# If the variable was already defined by the user or the package
# is not present on the system ([$VARIABLE_PREFIX]_HAVE <> yes)
# pkg-config will not be executed and the old value remains.
# In addition the variable will be shown on "./configure --help"
# described by a given help-string.
#
# Parameters:
# - VARIABLE_PREFIX: the prefix for the variables storing
# information about the package.
# - POSTFIX: [$VARIABLE_PREFIX]_[$POSTFIX] will contain the value
# - COMMAND: a pkg-config command, e.g. "variable=prefix"
# - MODULE: the package pkg-config will retrieve info from
# - HELP-STRING: description of the variable
#
# Sets:
# [$VARIABLE_PREFIX]_[$POSTFIX] # value (AC_SUBST)
AC_DEFUN([PKG_VALUE],
[
AC_ARG_VAR([$1]_[$2], [$5, overriding pkg-config])
# check if variable was defined by the user
if test -z "$[$1]_[$2]"; then
# if not, get it from pkg-config
if test x$[$1][_HAVE] = xyes; then
PKG_CHECK_EXISTS([$4],
[[$1]_[$2]=`$PKG_CONFIG --[$3] --silence-errors "$4"`],
[# print error message and quit
err_msg=`$PKG_CONFIG --errors-to-stdout --print-errors "$4"`
AC_MSG_ERROR(
[
$err_msg
If --with-[$1]=nocheck is defined the environment variable
[$1]_[$2]
must be set to avoid the need to call pkg-config.
See the pkg-config man page for more details.
])
])
fi
fi
AC_SUBST([$1]_[$2])
])
# SYNOPSIS
#
# PKG_VERSION(VARIABLE_PREFIX, MODULE)
#
# DESCRIPTION
#
# Retrieves the version of a package
#
# Parameters:
# - VARIABLE_PREFIX: the prefix for the variables storing
# information about the package.
# - MODULE: package name according to pkg-config
#
# Sets:
# [$VARIABLE_PREFIX]_VERSION # full version string
# # (format: "major.minor.release")
#
# [$VARIABLE_PREFIX]_VERSION_MAJOR # major version number
# [$VARIABLE_PREFIX]_VERSION_MINOR # minor version number
# [$VARIABLE_PREFIX]_VERSION_RELEASE # release version number
#
# [$VARIABLE_PREFIX]_VERSION_INT # integer representation:
# # MMMmmmrrr (M:major,m:minor,r:release)
AC_DEFUN([PKG_VERSION],
[
if test x$[$1][_HAVE] = xyes; then
AC_MSG_CHECKING([version of $1])
PKG_VALUE([$1], [VERSION], [modversion], [$2], [version of $1])
AC_MSG_RESULT(@<:@$[$1][_VERSION]@:>@)
else
[$1][_VERSION]="0.0.0"
fi
AX_EXTRACT_VERSION([$1], $[$1][_VERSION])
])
# SYNOPSIS
#
# AX_TRIM(STRING)
#
# DESCRIPTION
#
# Removes surrounding whitespace
AC_DEFUN([AX_TRIM],
[
echo "[$1]" | $SED 's/^[[ \t]]*//' | $SED 's/[[ \t]]*$//'
])
# SYNOPSIS
#
# PKG_HAVE(VARIABLE_PREFIX, MODULE, [REQUIRED])
#
# DESCRIPTION
#
# Checks with pkg-config if a package exists and retrieves
# information about it.
#
# Parameters:
# - VARIABLE_PREFIX: the prefix for the variables storing information about the package.
# - MODULE: package name according to pkg-config
# - REQUIRED: if true, the configure-script is aborted if the package was not found
#
# Uses:
# with_[$VARIABLE_PREFIX]: whether and how the package should be checked for
# "check": check for the package but do not abort if it does not exist (default)
# "no": do not check for the package (sets _HAVE to "no" and _VERSION to "0.0.0")
# "yes": check for the package and abort if it does not exist
# "nocheck": do not check for the package (sets _HAVE to "yes")
#
# Sets:
# [$VARIABLE_PREFIX]_HAVE # package is available (values: "yes"|"no")
# [$VARIABLE_PREFIX]_LIBS # linker flags (e.g. -Lmylibdir -lmylib)
# [$VARIABLE_PREFIX]_LIBDIRS # library dirs (e.g. -Lmylibdir)
AC_DEFUN([PKG_HAVE],
[
have_lib="no"
AC_MSG_CHECKING([for $2])
if test x"$with_[$1]" = xnocheck; then
# do not call pkg-config, use user settings
have_lib="yes"
elif test x"$with_[$1]" != xno; then
# check if package exists
PKG_CHECK_EXISTS([$2], [
have_lib="yes"
[$1][_LIBS]=`$PKG_CONFIG --libs --silence-errors "$2"`
[$1][_LIBDIRS]=`$PKG_CONFIG --libs-only-L --silence-errors "$2"`
[$1][_LIBDIRS]=`AX_TRIM($[$1][_LIBDIRS])`
# add library directories to LIBS (ignore *_LIBS for now)
if test -n "$[$1][_LIBDIRS]"; then
LIBS="$LIBS $[$1][_LIBDIRS]"
fi
])
fi
if test x$have_lib = xyes; then
[$1][_HAVE]="yes"
if test -n "$[$1][_LIBDIRS]"; then
# show additional lib-dirs
AC_MSG_RESULT(yes [(]$[$1][_LIBDIRS][)])
else
AC_MSG_RESULT(yes)
fi
else
[$1][_HAVE]="no"
AC_MSG_RESULT(no)
# check if package is required
if test x$3 = xyes -o x"$with_[$1]" = xyes ; then
# print error message and quit
err_msg=`$PKG_CONFIG --errors-to-stdout --print-errors "$2"`
AC_MSG_ERROR(
[
$err_msg
Alternatively, you may set --with-[$1]=nocheck and the environment
variables [$1]_[[...]] (see configure --help)
to appropriate values to avoid the need to call pkg-config.
See the pkg-config man page for more details.
])
fi
fi
])
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