dnl If needed, define the m4_ifblank and m4_ifnblank macros from autoconf 2.64
dnl This allows us to run with earlier Autoconfs as well.
dnl
dnl m4_ifblank(COND, [IF-BLANK], [IF-TEXT])
dnl m4_ifnblank(COND, [IF-TEXT], [IF-BLANK])
dnl ----------------------------------------
dnl If COND is empty, or consists only of blanks (space, tab, newline),
dnl then expand IF-BLANK, otherwise expand IF-TEXT. This differs from
dnl m4_ifval only if COND has just whitespace, but it helps optimize in
dnl spite of users who mistakenly leave trailing space after what they
dnl thought was an empty argument:
dnl macro(
dnl []
dnl )
dnl
dnl Writing one macro in terms of the other causes extra overhead, so
dnl we inline both definitions.
ifdef([m4_ifblank],[],[
m4_define([m4_ifblank],
[m4_if(m4_translit([[$1]], [ ][ ][
]), [], [$2], [$3])])])
ifdef([m4_ifnblank],[],[
m4_define([m4_ifnblank],
[m4_if(m4_translit([[$1]], [ ][ ][
]), [], [$3], [$2])])])
dnl UL_PKG_STATIC(VARIABLE, MODULES)
dnl
dnl Calls pkg-config --static
dnl
AC_DEFUN([UL_PKG_STATIC], [
if AC_RUN_LOG([$PKG_CONFIG --exists --print-errors "$2"]); then
$1=`$PKG_CONFIG --libs --static "$2"`
else
AC_MSG_ERROR([pkg-config description of $2, needed for static build, is not available])
fi
])
dnl UL_CHECK_LIB(LIBRARY, FUNCTION, [VARSUFFIX = $1]))
dnl
dnl The VARSUFFIX is optional and overrides the default behavior. For example:
dnl UL_CHECK_LIB(yyy, func, xxx) generates have_xxx and HAVE_LIBXXX
dnl UL_CHECK_LIB(yyy, func) generates have_yyy and HAVE_LIBYYY
dnl
AC_DEFUN([UL_CHECK_LIB], [
m4_define([suffix], m4_default([$3],$1))
[have_]suffix=yes
m4_ifdef([$3],
[AC_CHECK_LIB([$1], [$2], [AC_DEFINE(AS_TR_CPP([HAVE_LIB]suffix), 1)], [[have_]suffix=no])],
[AC_CHECK_LIB([$1], [$2], [], [[have_]suffix=no])])
AM_CONDITIONAL(AS_TR_CPP([HAVE_]suffix), [test [$have_]suffix = yes])
])
dnl UL_SET_ARCH(ARCHNAME, PATTERN)
dnl
dnl Define ARCH_<archname> condition if the pattern match with the current
dnl architecture
dnl
AC_DEFUN([UL_SET_ARCH], [
cpu_$1=false
case "$host" in
$2) cpu_$1=true ;;
esac
AM_CONDITIONAL(AS_TR_CPP(ARCH_$1), [test "x$cpu_$1" = xtrue])
])
dnl UL_SET_FLAGS(CFLAGS, CPPFLAGS, LDFLAGS)
dnl
dnl Sets new global CFLAGS, CPPFLAGS and LDFLAG, the original
dnl setting could be restored by UL_RESTORE_FLAGS()
dnl
AC_DEFUN([UL_SET_FLAGS], [
old_CFLAGS="$CFLAGS"
old_CPPFLAGS="$CPPFLAGS"
old_LDFLAGS="$LDFLAGS"
CFLAGS="$CFLAGS $1"
CPPFLAGS="$CPPFLAGS $2"
LDFLAGS="$LDFLAGS $3"
])
dnl UL_RESTORE_FLAGS()
dnl
dnl Restores CFLAGS, CPPFLAGS and LDFLAG previously saved by UL_SET_FLAGS()
dnl
AC_DEFUN([UL_RESTORE_FLAGS], [
CFLAGS="$old_CFLAGS"
CPPFLAGS="$old_CPPFLAGS"
LDFLAGS="$old_LDFLAGS"
])
dnl UL_CHECK_SYSCALL(SYSCALL, FALLBACK, ...)
dnl
dnl Only specify FALLBACK if the SYSCALL you're checking for is a "newish" one
dnl
AC_DEFUN([UL_CHECK_SYSCALL], [
dnl This macro uses host_cpu.
AC_REQUIRE([AC_CANONICAL_HOST])
AC_CACHE_CHECK([for syscall $1],
[ul_cv_syscall_$1],
[_UL_SYSCALL_CHECK_DECL([SYS_$1],
[syscall=SYS_$1],
[dnl Our libc failed use, so see if we can get the kernel
dnl headers to play ball ...
_UL_SYSCALL_CHECK_DECL([_NR_$1],
[syscall=_NR_$1],
[
syscall=no
if test "x$linux_os" = xyes; then
case $host_cpu in
_UL_CHECK_SYSCALL_FALLBACK(m4_shift($@))
esac
fi
])
])
ul_cv_syscall_$1=$syscall
])
case $ul_cv_syscall_$1 in #(
no) AC_MSG_WARN([Unable to detect syscall $1.]) ;;
SYS_*) ;;
*) AC_DEFINE_UNQUOTED([SYS_$1], [$ul_cv_syscall_$1],
[Fallback syscall number for $1]) ;;
esac
])
dnl _UL_SYSCALL_CHECK_DECL(SYMBOL, ACTION-IF-FOUND, ACTION-IF-NOT-FOUND)
dnl
dnl Check if SYMBOL is declared, using the headers needed for syscall checks.
dnl
m4_define([_UL_SYSCALL_CHECK_DECL],
[AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
#include <sys/syscall.h>
#include <unistd.h>
]], [[int test = $1;]])],
[$2], [$3])
])
dnl _UL_CHECK_SYSCALL_FALLBACK(PATTERN, VALUE, ...)
dnl
dnl Helper macro to create the body for the above `case'.
dnl
m4_define([_UL_CHECK_SYSCALL_FALLBACK],
[m4_ifval([$1],
[#(
$1) syscall="$2" ;;dnl
_UL_CHECK_SYSCALL_FALLBACK(m4_shiftn(2, $@))])dnl
])
dnl UL_REQUIRES_LINUX(NAME, [VARSUFFIX = $1])
dnl
dnl Modifies $build_<name> variable according to $enable_<name> and OS type. The
dnl $enable_<name> could be "yes", "no" and "check". If build_<name> is "no" then
dnl all checks are skiped.
dnl
dnl The default <name> for $build_ and $enable_ could be overwrited by option $2.
dnl
AC_DEFUN([UL_REQUIRES_LINUX], [
m4_define([suffix], m4_default([$2],$1))
if test "x$[build_]suffix" != xno; then
AC_REQUIRE([AC_CANONICAL_HOST])
case $[enable_]suffix:$linux_os in #(
no:*)
[build_]suffix=no ;;
yes:yes)
[build_]suffix=yes ;;
yes:*)
AC_MSG_ERROR([$1 selected for non-linux system]);;
check:yes)
[build_]suffix=yes ;;
check:*)
AC_MSG_WARN([non-linux system; not building $1])
[build_]suffix=no ;;
esac
fi
])
dnl UL_EXCLUDE_ARCH(NAME, ARCH, VARSUFFIX = $1])
dnl
dnl Modifies $build_<name> variable according to $enable_<name> and $host. The
dnl $enable_<name> could be "yes", "no" and "check". If build_<name> is "no" then
dnl all checks are skiped.
dnl
dnl The default <name> for $build_ and $enable_ could be overwrited by option $3.
dnl
AC_DEFUN([UL_EXCLUDE_ARCH], [
m4_define([suffix], m4_default([$3],$1))
if test "x$[build_]suffix" != xno; then
AC_REQUIRE([AC_CANONICAL_HOST])
case $[enable_]suffix:"$host" in #(
no:*)
[build_]suffix=no ;;
yes:$2)
AC_MSG_ERROR([$1 selected for unsupported architecture]);;
yes:*)
[build_]suffix=yes ;;
check:$2)
AC_MSG_WARN([excluded for $host architecture; not building $1])
[build_]suffix=no ;;
check:*)
[build_]suffix=yes ;;
esac
fi
])
dnl UL_REQUIRES_HAVE(NAME, HAVENAME, HAVEDESC [VARSUFFIX=$1])
dnl
dnl Modifies $build_<name> variable according to $enable_<name> and
dnl $have_<havename>. The <havedesc> is description used ifor warning/error
dnl message (e.g. "function").
dnl
dnl The <havename> maybe a list, then at least one of the items in the list
dnl have to exist, for example: [ncurses, tinfo] means that have_ncurser=yes
dnl *or* have_tinfo=yes must be defined.
dnl
dnl The default <name> for $build_ and $enable_ could be overwrited by option $3.
dnl
AC_DEFUN([UL_REQUIRES_HAVE], [
m4_define([suffix], m4_default([$4],$1))
if test "x$[build_]suffix" != xno; then
[ul_haveone_]suffix=no
m4_foreach([onehave], [$2], [
if test "x$[have_]onehave" = xyes; then
[ul_haveone_]suffix=yes
fi
])dnl
case $[enable_]suffix:$[ul_haveone_]suffix in #(
no:*)
[build_]suffix=no ;;
yes:yes)
[build_]suffix=yes ;;
yes:*)
AC_MSG_ERROR([$1 selected, but required $3 not available]);;
check:yes)
[build_]suffix=yes ;;
check:*)
AC_MSG_WARN([$3 not found; not building $1])
[build_]suffix=no ;;
esac
fi
])
dnl
dnl UL_CONFLICTS_BUILD(NAME, ANOTHER, ANOTHERDESC [VARSUFFIX=$1])
dnl
dnl - ends with error if $enable_<name> and $build_<another>
dnl are both set to 'yes'
dnl - sets $build_<name> to 'no' if $build_<another> is 'yes' and
dnl $enable_<name> is 'check' or 'no'
dnl
dnl The <havedesc> is description used for warning/error
dnl message (e.g. "function").
dnl
dnl The default <name> for $build_ and $enable_ could be overwrited by option $3.
dnl
AC_DEFUN([UL_CONFLICTS_BUILD], [
m4_define([suffix], m4_default([$4],$1))
if test "x$[build_]suffix" != xno; then
case $[enable_]suffix:$[build_]$2 in #(
no:*)
[build_]suffix=no ;;
check:yes)
[build_]suffix=no ;;
check:no)
[build_]suffix=yes ;;
yes:yes)
AC_MSG_ERROR([$1 selected, but it conflicts with $3]);;
esac
fi
])
dnl UL_REQUIRES_BUILD(NAME, BUILDNAME, [VARSUFFIX=$1])
dnl
dnl Modifies $build_<name> variable according to $enable_<name> and $have_funcname.
dnl
dnl The default <name> for $build_ and $enable_ could be overwrited by option $3.
dnl
AC_DEFUN([UL_REQUIRES_BUILD], [
m4_define([suffix], m4_default([$3],$1))
if test "x$[build_]suffix" != xno; then
case $[enable_]suffix:$[build_]$2 in #(
no:*)
[build_]suffix=no ;;
yes:yes)
[build_]suffix=yes ;;
yes:*)
AC_MSG_ERROR([$2 is needed to build $1]);;
check:yes)
[build_]suffix=yes ;;
check:*)
AC_MSG_WARN([$2 disabled; not building $1])
[build_]suffix=no ;;
esac
fi
])
dnl UL_REQUIRES_SYSCALL_CHECK(NAME, SYSCALL-TEST, [SYSCALLNAME=$1], [VARSUFFIX=$1])
dnl
dnl Modifies $build_<name> variable according to $enable_<name> and SYSCALL-TEST
dnl result. The $enable_<name> variable could be "yes", "no" and "check". If build_<name>
dnl is "no" then all checks are skiped.
dnl
dnl Note that SYSCALL-TEST has to define $ul_cv_syscall_<name> variable, see
dnl also UL_CHECK_SYSCALL().
dnl
dnl The default <name> for $build_ and $enable_ count be overwrited by option $4 and
dnl $ul_cv_syscall_ could be overwrited by $3.
dnl
AC_DEFUN([UL_REQUIRES_SYSCALL_CHECK], [
m4_define([suffix], m4_default([$4],$1))
m4_define([callname], m4_default([$3],$1))
if test "x$[build_]suffix" != xno; then
if test "x$[enable_]suffix" = xno; then
[build_]suffix=no
else
$2
case $[enable_]suffix:$[ul_cv_syscall_]callname in #(
no:*)
[build_]suffix=no ;;
yes:no)
AC_MSG_ERROR([$1 selected but callname syscall not found]) ;;
check:no)
AC_MSG_WARN([callname syscall not found; not building $1])
[build_]suffix=no ;;
*)
dnl default $ul_cv_syscall_ is SYS_ value
[build_]suffix=yes ;;
esac
fi
fi
])
dnl UL_BUILD_INIT(NAME, [ENABLE_STATE], [VARSUFFIX = $1])
dnl
dnl Initializes $build_<name> variable according to $enable_<name>. If
dnl $enable_<name> is undefined then ENABLE_STATE is used and $enable_<name> is
dnl set to ENABLE_STATE.
dnl
dnl The default <name> for $build_ and $enable_ could be overwrited by option $2.
dnl
AC_DEFUN([UL_BUILD_INIT], [
m4_define([suffix], m4_default([$3],$1))
m4_ifblank([$2],
[if test "x$enable_[]suffix" = xno; then
build_[]suffix=no
else
build_[]suffix=yes
fi],
[if test "x$ul_default_estate" != x; then
enable_[]suffix=$ul_default_estate
build_[]suffix=yes
if test "x$ul_default_estate" = xno; then
build_[]suffix=no
fi
else[]
ifelse(
[$2], [check],[
build_[]suffix=yes
enable_[]suffix=check],
[$2], [yes],[
build_[]suffix=yes
enable_[]suffix=yes],
[$2], [no], [
build_[]suffix=no
enable_[]suffix=no])
fi])
])
dnl UL_DEFAULT_ENABLE(NAME, ENABLE_STATE)
dnl
dnl Initializes $enable_<name> variable according to ENABLE_STATE. The default
dnl setting is possible to override by global $ul_default_estate.
dnl
AC_DEFUN([UL_DEFAULT_ENABLE], [
m4_define([suffix], $1)
if test "x$ul_default_estate" != x; then
enable_[]suffix=$ul_default_estate
else
enable_[]suffix=$2
fi
])
