289 lines
9.1 KiB
Plaintext
289 lines
9.1 KiB
Plaintext
dnl Helper macros for Tor configure.ac
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dnl Copyright (c) 2001-2004, Roger Dingledine
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dnl Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson
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dnl Copyright (c) 2007-2008, Roger Dingledine, Nick Mathewson
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dnl Copyright (c) 2007-2017, The Tor Project, Inc.
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dnl See LICENSE for licensing information
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AC_DEFUN([TOR_EXTEND_CODEPATH],
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[
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if test -d "$1/lib"; then
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LDFLAGS="-L$1/lib $LDFLAGS"
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else
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LDFLAGS="-L$1 $LDFLAGS"
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fi
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if test -d "$1/include"; then
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CPPFLAGS="-I$1/include $CPPFLAGS"
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else
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CPPFLAGS="-I$1 $CPPFLAGS"
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fi
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])
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AC_DEFUN([TOR_DEFINE_CODEPATH],
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[
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if test x$1 = "x(system)"; then
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TOR_LDFLAGS_$2=""
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TOR_CPPFLAGS_$2=""
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else
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if test -d "$1/lib"; then
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TOR_LDFLAGS_$2="-L$1/lib"
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TOR_LIBDIR_$2="$1/lib"
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else
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TOR_LDFLAGS_$2="-L$1"
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TOR_LIBDIR_$2="$1"
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fi
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if test -d "$1/include"; then
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TOR_CPPFLAGS_$2="-I$1/include"
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else
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TOR_CPPFLAGS_$2="-I$1"
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fi
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fi
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AC_SUBST(TOR_CPPFLAGS_$2)
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AC_SUBST(TOR_LDFLAGS_$2)
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])
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dnl 1: flags
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dnl 2: try to link too if this is nonempty.
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dnl 3: what to do on success compiling
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dnl 4: what to do on failure compiling
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AC_DEFUN([TOR_TRY_COMPILE_WITH_CFLAGS], [
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AS_VAR_PUSHDEF([VAR],[tor_cv_cflags_$1])
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AC_CACHE_CHECK([whether the compiler accepts $1], VAR, [
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tor_saved_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -pedantic -Werror $1"
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
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[AS_VAR_SET(VAR,yes)],
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[AS_VAR_SET(VAR,no)])
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if test x$2 != x; then
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AS_VAR_PUSHDEF([can_link],[tor_can_link_$1])
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AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
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[AS_VAR_SET(can_link,yes)],
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[AS_VAR_SET(can_link,no)])
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AS_VAR_POPDEF([can_link])
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fi
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CFLAGS="$tor_saved_CFLAGS"
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])
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if test x$VAR = xyes; then
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$3
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else
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$4
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fi
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AS_VAR_POPDEF([VAR])
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])
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dnl 1:flags
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dnl 2:also try to link (yes: non-empty string)
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dnl will set yes or no in $tor_can_link_$1 (as modified by AS_VAR_PUSHDEF)
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AC_DEFUN([TOR_CHECK_CFLAGS], [
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TOR_TRY_COMPILE_WITH_CFLAGS($1, $2, CFLAGS="$CFLAGS $1", true)
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])
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dnl 1:flags
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dnl 2:extra ldflags
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dnl 3:extra libraries
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AC_DEFUN([TOR_CHECK_LDFLAGS], [
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AS_VAR_PUSHDEF([VAR],[tor_cv_ldflags_$1])
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AC_CACHE_CHECK([whether the linker accepts $1], VAR, [
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tor_saved_CFLAGS="$CFLAGS"
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tor_saved_LDFLAGS="$LDFLAGS"
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tor_saved_LIBS="$LIBS"
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CFLAGS="$CFLAGS -pedantic -Werror"
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LDFLAGS="$LDFLAGS $2 $1"
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LIBS="$LIBS $3"
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AC_RUN_IFELSE([AC_LANG_PROGRAM([#include <stdio.h>], [fputs("", stdout)])],
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[AS_VAR_SET(VAR,yes)],
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[AS_VAR_SET(VAR,no)],
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
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[AS_VAR_SET(VAR,yes)],
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[AS_VAR_SET(VAR,no)])])
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CFLAGS="$tor_saved_CFLAGS"
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LDFLAGS="$tor_saved_LDFLAGS"
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LIBS="$tor_saved_LIBS"
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])
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if test x$VAR = xyes; then
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LDFLAGS="$LDFLAGS $1"
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fi
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AS_VAR_POPDEF([VAR])
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])
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dnl 1:libname
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AC_DEFUN([TOR_WARN_MISSING_LIB], [
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h=""
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if test x$2 = xdevpkg; then
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h=" headers for"
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fi
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if test -f /etc/debian_version && test x"$tor_$1_$2_debian" != x; then
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AC_MSG_WARN([On Debian, you can install$h $1 using "apt-get install $tor_$1_$2_debian"])
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if test x"$tor_$1_$2_debian" != x"$tor_$1_devpkg_debian"; then
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AC_MSG_WARN([ You will probably need $tor_$1_devpkg_debian too.])
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fi
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fi
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if test -f /etc/fedora-release && test x"$tor_$1_$2_redhat" != x; then
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AC_MSG_WARN([On Fedora, you can install$h $1 using "dnf install $tor_$1_$2_redhat"])
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if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
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AC_MSG_WARN([ You will probably need to install $tor_$1_devpkg_redhat too.])
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fi
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else
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if test -f /etc/redhat-release && test x"$tor_$1_$2_redhat" != x; then
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AC_MSG_WARN([On most Redhat-based systems, you can get$h $1 by installing the $tor_$1_$2_redhat RPM package])
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if test x"$tor_$1_$2_redhat" != x"$tor_$1_devpkg_redhat"; then
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AC_MSG_WARN([ You will probably need to install $tor_$1_devpkg_redhat too.])
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fi
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fi
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fi
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])
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dnl Look for a library, and its associated includes, and how to link
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dnl against it.
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dnl
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dnl TOR_SEARCH_LIBRARY(1:libname, 2:IGNORED, 3:linkargs, 4:headers,
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dnl 5:prototype,
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dnl 6:code, 7:IGNORED, 8:searchextra)
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dnl
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dnl Special variables:
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dnl ALT_{libname}_WITHVAL -- another possible value for --with-$1-dir.
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dnl Used to support renaming --with-ssl-dir to --with-openssl-dir
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dnl
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AC_DEFUN([TOR_SEARCH_LIBRARY], [
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try$1dir=""
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AC_ARG_WITH($1-dir,
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AS_HELP_STRING(--with-$1-dir=PATH, [specify path to $1 installation]),
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[
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if test x$withval != xno ; then
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try$1dir="$withval"
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fi
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])
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if test "x$try$1dir" = x && test "x$ALT_$1_WITHVAL" != x ; then
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try$1dir="$ALT_$1_WITHVAL"
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fi
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tor_saved_LIBS="$LIBS"
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tor_saved_LDFLAGS="$LDFLAGS"
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tor_saved_CPPFLAGS="$CPPFLAGS"
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AC_CACHE_CHECK([for $1 directory], tor_cv_library_$1_dir, [
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tor_$1_dir_found=no
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tor_$1_any_linkable=no
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for tor_trydir in "$try$1dir" "(system)" "$prefix" /usr/local /usr/pkg $8; do
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LDFLAGS="$tor_saved_LDFLAGS"
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LIBS="$tor_saved_LIBS $3"
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CPPFLAGS="$tor_saved_CPPFLAGS"
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if test -z "$tor_trydir" ; then
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continue;
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fi
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# Skip the directory if it isn't there.
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if test ! -d "$tor_trydir" && test "$tor_trydir" != "(system)"; then
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continue;
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fi
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# If this isn't blank, try adding the directory (or appropriate
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# include/libs subdirectories) to the command line.
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if test "$tor_trydir" != "(system)"; then
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TOR_EXTEND_CODEPATH($tor_trydir)
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fi
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# Can we link against (but not necessarily run, or find the headers for)
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# the binary?
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AC_LINK_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
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[linkable=yes], [linkable=no])
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if test "$linkable" = yes; then
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tor_$1_any_linkable=yes
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# Okay, we can link against it. Can we find the headers?
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$4], [$6])],
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[buildable=yes], [buildable=no])
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if test "$buildable" = yes; then
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tor_cv_library_$1_dir=$tor_trydir
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tor_$1_dir_found=yes
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break
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fi
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fi
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done
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if test "$tor_$1_dir_found" = no; then
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if test "$tor_$1_any_linkable" = no ; then
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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])
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TOR_WARN_MISSING_LIB($1, pkg)
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AC_MSG_ERROR([Missing libraries; unable to proceed.])
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else
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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.])
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TOR_WARN_MISSING_LIB($1, devpkg)
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AC_MSG_ERROR([Missing headers; unable to proceed.])
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fi
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fi
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LDFLAGS="$tor_saved_LDFLAGS"
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LIBS="$tor_saved_LIBS"
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CPPFLAGS="$tor_saved_CPPFLAGS"
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]) dnl end cache check
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LIBS="$LIBS $3"
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if test "$tor_cv_library_$1_dir" != "(system)"; then
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TOR_EXTEND_CODEPATH($tor_cv_library_$1_dir)
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fi
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TOR_DEFINE_CODEPATH($tor_cv_library_$1_dir, $1)
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if test "$cross_compiling" != yes; then
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AC_CACHE_CHECK([whether we need extra options to link $1],
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tor_cv_library_$1_linker_option, [
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orig_LDFLAGS="$LDFLAGS"
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runs=no
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linked_with=nothing
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if test -d "$tor_cv_library_$1_dir/lib"; then
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tor_trydir="$tor_cv_library_$1_dir/lib"
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else
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tor_trydir="$tor_cv_library_$1_dir"
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fi
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for tor_tryextra in "(none)" "-Wl,-R$tor_trydir" "-R$tor_trydir" \
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"-Wl,-rpath,$tor_trydir" ; do
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if test "$tor_tryextra" = "(none)"; then
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LDFLAGS="$orig_LDFLAGS"
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else
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LDFLAGS="$tor_tryextra $orig_LDFLAGS"
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fi
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AC_RUN_IFELSE([AC_LANG_PROGRAM([$5], [$6])],
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[runnable=yes], [runnable=no],
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[AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[]])],
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[runnable=yes],
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[runnable=no])])
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if test "$runnable" = yes; then
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tor_cv_library_$1_linker_option=$tor_tryextra
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break
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fi
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done
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if test "$runnable" = no; then
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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-$1-dir}])
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fi
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LDFLAGS="$orig_LDFLAGS"
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]) dnl end cache check check for extra options.
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if test "$tor_cv_library_$1_linker_option" != "(none)" ; then
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TOR_LDFLAGS_$1="$TOR_LDFLAGS_$1 $tor_cv_library_$1_linker_option"
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fi
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fi # cross-compile
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LIBS="$tor_saved_LIBS"
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LDFLAGS="$tor_saved_LDFLAGS"
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CPPFLAGS="$tor_saved_CPPFLAGS"
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]) dnl end defun
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dnl Check whether the prototype for a function is present or missing.
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dnl Apple has a nasty habit of putting functions in their libraries (so that
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dnl AC_CHECK_FUNCS passes) but not actually declaring them in the headers.
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dnl
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dnl TOR_CHECK_PROTYPE(1:functionname, 2:macroname, 2: includes)
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AC_DEFUN([TOR_CHECK_PROTOTYPE], [
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AC_CACHE_CHECK([for declaration of $1], tor_cv_$1_declared, [
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AC_COMPILE_IFELSE([AC_LANG_PROGRAM([$3],[void *ptr= $1 ;])],
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tor_cv_$1_declared=yes,tor_cv_$1_declared=no)])
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if test x$tor_cv_$1_declared != xno ; then
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AC_DEFINE($2, 1,
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[Defined if the prototype for $1 seems to be present.])
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fi
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])
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