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tor/acinclude.m4

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dnl Helper macros for Tor configure.in
dnl Copyright (c) 2001-2004, Roger Dingledine
dnl Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson
dnl Copyright (c) 2007-2008, Roger Dingledine, Nick Mathewson
dnl Copyright (c) 2007-2012, The Tor Project, Inc.
dnl See LICENSE for licensing information
AC_DEFUN([TOR_EXTEND_CODEPATH],
[
if test -d "$1/lib"; then
LDFLAGS="-L$1/lib $LDFLAGS"
else
LDFLAGS="-L$1 $LDFLAGS"
fi
if test -d "$1/include"; then
CPPFLAGS="-I$1/include $CPPFLAGS"
else
CPPFLAGS="-I$1 $CPPFLAGS"
fi
])
AC_DEFUN([TOR_DEFINE_CODEPATH],
[
if test x$1 = "x(system)"; then
TOR_LDFLAGS_$2=""
TOR_CPPFLAGS_$2=""
else
if test -d "$1/lib"; then
TOR_LDFLAGS_$2="-L$1/lib"
TOR_LIBDIR_$2="$1/lib"
else
TOR_LDFLAGS_$2="-L$1"
TOR_LIBDIR_$2="$1"
fi
if test -d "$1/include"; then
TOR_CPPFLAGS_$2="-I$1/include"
else
TOR_CPPFLAGS_$2="-I$1"
fi
fi
AC_SUBST(TOR_CPPFLAGS_$2)
AC_SUBST(TOR_LDFLAGS_$2)
])
dnl 1:flags
AC_DEFUN([TOR_CHECK_CFLAGS], [
AS_VAR_PUSHDEF([VAR],[tor_cv_cflags_$1])
AC_CACHE_CHECK([whether the compiler accepts $1], VAR, [
tor_saved_CFLAGS="$CFLAGS"
CFLAGS="$CFLAGS -pedantic -Werror $1"
AC_TRY_COMPILE([], [return 0;],
[AS_VAR_SET(VAR,yes)],
[AS_VAR_SET(VAR,no)])
CFLAGS="$tor_saved_CFLAGS"
])
if test x$VAR = xyes; then
CFLAGS="$CFLAGS $1"
fi
AS_VAR_POPDEF([VAR])
])
dnl 1:flags
dnl 2:extra ldflags
dnl 3:extra libraries
AC_DEFUN([TOR_CHECK_LDFLAGS], [
AS_VAR_PUSHDEF([VAR],[tor_cv_ldflags_$1])
AC_CACHE_CHECK([whether the linker accepts $1], VAR, [
tor_saved_CFLAGS="$CFLAGS"
tor_saved_LDFLAGS="$LDFLAGS"
tor_saved_LIBS="$LIBS"
CFLAGS="$CFLAGS -pedantic -Werror"
LDFLAGS="$LDFLAGS $2 $1"
LIBS="$LIBS $3"
AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [fputs("", stdout)])],
[AS_VAR_SET(VAR,yes)],
[AS_VAR_SET(VAR,no)],
[AC_TRY_LINK([], [return 0;],
[AS_VAR_SET(VAR,yes)],
[AS_VAR_SET(VAR,no)])])
CFLAGS="$tor_saved_CFLAGS"
LDFLAGS="$tor_saved_LDFLAGS"
LIBS="$tor_saved_LIBS"
])
if test x$VAR = xyes; then
LDFLAGS="$LDFLAGS $1"
fi
AS_VAR_POPDEF([VAR])
])
dnl 1:libname
AC_DEFUN([TOR_WARN_MISSING_LIB], [
h=""
if test x$2 = xdevpkg; then
h=" headers for"
fi
if test -f /etc/debian_version && test x"$tor_$1_$2_debian" != x; then
AC_WARN([On Debian, you can install$h $1 using "apt-get install $tor_$1_$2_debian"])
if test x"$tor_$1_$2_debian" != x"$tor_$1_devpkg_debian"; then
AC_WARN([ You will probably need $tor_$1_devpkg_debian too.])
fi
fi
if test -f /etc/fedora-release && test x"$tor_$1_$2_redhat" != x; then
AC_WARN([On Fedora Core, you can install$h $1 using "yum install $tor_$1_$2_redhat"])
if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
AC_WARN([ You will probably need to install $tor_$1_devpkg_redhat too.])
fi
else
if test -f /etc/redhat-release && test x"$tor_$1_$2_redhat" != x; then
AC_WARN([On most Redhat-based systems, you can get$h $1 by installing the $tor_$1_$2_redhat" RPM package])
if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
AC_WARN([ You will probably need to install $tor_$1_devpkg_redhat too.])
fi
fi
fi
])
dnl Look for a library, and its associated includes, and how to link
dnl against it.
dnl
dnl TOR_SEARCH_LIBRARY(1:libname, 2:IGNORED, 3:linkargs, 4:headers,
dnl 5:prototype,
dnl 6:code, 7:IGNORED, 8:searchextra)
dnl
dnl Special variables:
dnl ALT_{libname}_WITHVAL -- another possible value for --with-$1-dir.
dnl Used to support renaming --with-ssl-dir to --with-openssl-dir
dnl
AC_DEFUN([TOR_SEARCH_LIBRARY], [
try$1dir=""
AC_ARG_WITH($1-dir,
[ --with-$1-dir=PATH Specify path to $1 installation ],
[
if test x$withval != xno ; then
try$1dir="$withval"
fi
])
if test "x$try$1dir" = x && test "x$ALT_$1_WITHVAL" != x ; then
try$1dir="$ALT_$1_WITHVAL"
fi
tor_saved_LIBS="$LIBS"
tor_saved_LDFLAGS="$LDFLAGS"
tor_saved_CPPFLAGS="$CPPFLAGS"
AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
tor_$1_dir_found=no
tor_$1_any_linkable=no
for tor_trydir in "$try$1dir" "(system)" "$prefix" /usr/local /usr/pkg $8; do
LDFLAGS="$tor_saved_LDFLAGS"
LIBS="$tor_saved_LIBS $3"
CPPFLAGS="$tor_saved_CPPFLAGS"
if test -z "$tor_trydir" ; then
continue;
fi
# Skip the directory if it isn't there.
if test ! -d "$tor_trydir" && test "$tor_trydir" != "(system)"; then
continue;
fi
# If this isn't blank, try adding the directory (or appropriate
# include/libs subdirectories) to the command line.
if test "$tor_trydir" != "(system)"; then
TOR_EXTEND_CODEPATH($tor_trydir)
fi
# Can we link against (but not necessarily run, or find the headers for)
# the binary?
AC_LINK_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
[linkable=yes], [linkable=no])
if test "$linkable" = yes; then
tor_$1_any_linkable=yes
# Okay, we can link against it. Can we find the headers?
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4], [$6])],
[buildable=yes], [buildable=no])
if test "$buildable" = yes; then
tor_cv_library_$1_dir=$tor_trydir
tor_$1_dir_found=yes
break
fi
fi
done
if test "$tor_$1_dir_found" = no; then
if test "$tor_$1_any_linkable" = no ; then
AC_MSG_WARN([Could not find a linkable $1. If you have it installed somewhere unusual, you can specify an explicit path using --with-$1-dir])
TOR_WARN_MISSING_LIB($1, pkg)
AC_MSG_ERROR([Missing libraries; unable to proceed.])
else
AC_MSG_WARN([We found the libraries for $1, but we could not find the C header files. You may need to install a devel package.])
TOR_WARN_MISSING_LIB($1, devpkg)
AC_MSG_ERROR([Missing headers; unable to proceed.])
fi
fi
LDFLAGS="$tor_saved_LDFLAGS"
LIBS="$tor_saved_LIBS"
CPPFLAGS="$tor_saved_CPPFLAGS"
]) dnl end cache check
LIBS="$LIBS $3"
if test "$tor_cv_library_$1_dir" != "(system)"; then
TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
fi
TOR_DEFINE_CODEPATH($tor_cv_library_$1_dir, $1)
if test "$cross_compiling" != yes; then
AC_CACHE_CHECK([whether we need extra options to link $1],
tor_cv_library_$1_linker_option, [
orig_LDFLAGS="$LDFLAGS"
runs=no
linked_with=nothing
if test -d "$tor_cv_library_$1_dir/lib"; then
tor_trydir="$tor_cv_library_$1_dir/lib"
else
tor_trydir="$tor_cv_library_$1_dir"
fi
for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
"-Wl,-rpath,$tor_trydir" ; do
if test "$tor_tryextra" = "(none)"; then
LDFLAGS="$orig_LDFLAGS"
else
LDFLAGS="$tor_tryextra $orig_LDFLAGS"
fi
AC_RUN_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
[runnable=yes], [runnable=no])
if test "$runnable" = yes; then
tor_cv_library_$1_linker_option=$tor_tryextra
break
fi
done
if test "$runnable" = no; then
AC_MSG_ERROR([Found linkable $1 in $tor_cv_library_$1_dir, but it does not seem to run, even with -R. Maybe specify another using --with-$1-dir}])
fi
LDFLAGS="$orig_LDFLAGS"
]) dnl end cache check check for extra options.
if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
TOR_LDFLAGS_$1="$TOR_LDFLAGS_$1 $tor_cv_library_$1_linker_option"
fi
fi # cross-compile
LIBS="$tor_saved_LIBS"
LDFLAGS="$tor_saved_LDFLAGS"
CPPFLAGS="$tor_saved_CPPFLAGS"
]) dnl end defun
dnl Check whether the prototype for a function is present or missing.
dnl Apple has a nasty habit of putting functions in their libraries (so that
dnl AC_CHECK_FUNCS passes) but not actually declaring them in the headers.
dnl
dnl TOR_CHECK_PROTYPE(1:functionname, 2:macroname, 2: includes)
AC_DEFUN([TOR_CHECK_PROTOTYPE], [
AC_CACHE_CHECK([for declaration of $1], tor_cv_$1_declared, [
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$3],[void *ptr= $1 ;])],
tor_cv_$1_declared=yes,tor_cv_$1_declared=no)])
if test x$tor_cv_$1_declared != xno ; then
AC_DEFINE($2, 1,
[Defined if the prototype for $1 seems to be present.])
fi
])
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