Feature #3330: mkmf (find|have)_cxx_header

• Status: Rejected
• Assignee: nobu (Nobuyoshi Nakada)
• Target version: -

[metanest (Makoto Kishimoto)]

=begin
うっかりruby-listに投げてしまったきしもとです

[ruby-list:47092] で振ってみた話題に関係して、なのですが（ツリーになりませんでしたが）、
mkmf に C++ のヘッダをチェックする機能を追加するパッチです。

Index: configure.in

--- configure.in (revision 27940)
+++ configure.in (working copy)
@@ -243,6 +243,7 @@
fi
AC_PROG_CC
AC_PROG_CXX
+AC_PROG_CXXCPP
AC_PROG_GCC_TRADITIONAL
AC_SUBST(GCC)
if test "$GCC" = yes; then
Index: lib/mkmf.rb

--- lib/mkmf.rb (revision 27940)
+++ lib/mkmf.rb (working copy)
@@ -408,6 +408,14 @@
conf)
end

+def cxxcpp_command(outfile, opt="")

• conf = RbConfig::CONFIG.merge('hdrdir' => $hdrdir.quote, 'srcdir' => $srcdir.quote,

•                            'arch_hdrdir' => "#$arch_hdrdir",
  

•                            'top_srcdir' => $top_srcdir.quote)
  

• RbConfig::expand("$(CXXCPP) #$INCFLAGS #$CPPFLAGS #$CXXFLAGS #{opt} #{CONFTEST_C} #{outfile}",

•     conf)
  

+end
+
def libpathflag(libpath=$DEFLIBPATH|$LIBPATH)
libpath.map{|x|
case x
@@ -454,8 +462,15 @@
rm_f "conftest*"
end

+def try_cxxcpp(src, opt="", &b)

• try_do(src, cxxcpp_command(CPPOUTFILE, opt), &b)
  +ensure
• rm_f "conftest*"
  +end

class Object
alias_method :try_header, (config_string('try_header') || :try_cpp)

• alias_method :try_cxx_header, (config_string('try_cxx_header') || :try_cxxcpp)
  end

def cpp_include(header)
@@ -840,6 +855,24 @@
end
end

+# Returns whether or not the given C plus plus +header+ file can be found on
+# your system. If found, a macro is passed as a preprocessor constant to the
+# compiler using the header file name, in uppercase, prepended with 'HAVE_'.
+#
+# For example, if have_header('foo.h') returned true, then the HAVE_FOO_H
+# preprocessor macro would be passed to the compiler.
+#
+def have_cxx_header(header, preheaders = nil, &b)

• checking_for header do
• if try_cxx_header(cpp_include(preheaders)+cpp_include(header), &b)

•  $defs.push(format("-DHAVE_%s", header.tr_cpp))
  

•  true
  

• else

•  false
  

• end
• end
  +end

Instructs mkmf to search for the given +header+ in any of the +paths+

provided, and returns whether or not it was found in those paths.

@@ -867,6 +900,33 @@
end
end

+# Instructs mkmf to search for the given C plus plus +header+ in any of the
+# +paths+ provided, and returns whether or not it was found in those paths.
+#
+# If the header is found then the path it was found on is added to the list
+# of included directories that are sent to the compiler (via the -I switch).
+#
+def find_cxx_header(header, *paths)

• message = checking_message(header, paths)
• header = cpp_include(header)
• checking_for message do
• if try_cxx_header(header)

•  true
  

• else

•  found = false
  

•  paths.each do |dir|
  

•    opt = "-I#{dir}".quote
  

•    if try_cxx_header(header, opt)
  

•      $INCFLAGS << " " << opt
  

•      found = true
  

•      break
  

•    end
  

•  end
  

•  found
  

• end
• end
  +end

Returns whether or not the struct of type +type+ contains +member+. If

it does not, or the struct type can't be found, then false is returned. You

may optionally specify additional +headers+ in which to look for the struct

=end

[mame (Yusuke Endoh)]

• Description updated (diff)
• Status changed from Open to Assigned
• Assignee set to nobu (Nobuyoshi Nakada)

[mame (Yusuke Endoh)]

• Status changed from Assigned to Rejected

#3333 と重複らしいのでこっちは閉じますね。(せっかくなのでキリ番を残す)

--
Yusuke Endoh [e-mail]