Feature #3333: mkmf (have|find)_cxx_header

• Status: Rejected
• Assignee: nobu (Nobuyoshi Nakada)
• Target version: 2.6

[nobu (Nobuyoshi Nakada)]

=begin
なかだです。

ruby-devに移動します。

At Fri, 21 May 2010 17:30:06 +0900,
KISHIMOTO, Makoto wrote in [ruby-list:47096]:

[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）、

redmine.ruby-lang.orgに登録されるのはruby-devかruby-coreだけです。

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。

チェックするのはヘッダだけでいいんでしょうか。have_libraryや
find_library、have_func、have_typeなども全部have_cxx_…を追加す
るんでしょうか。また、mkmf.rbではObjective-Cのソースも探すように
なっていますが、こちらにも対応しようと思うとhave_objc_…などとど
んどん数が増えてしまうので、どちらかというと、lang: "C++"のよう
なオプション引数を追加するほうがいいのではないかという気がしてい
ます。

--
--- 僕の前にBugはない。
--- 僕の後ろにBugはできる。
中田 伸悦
=end

[nahi (Hiroshi Nakamura)]

• Description updated (diff)

Imported from #3330

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

[nahi (Hiroshi Nakamura)]

• Assignee set to nobu (Nobuyoshi Nakada)

[shyouhei (Shyouhei Urabe)]

• Status changed from Open to Assigned

[mame (Yusuke Endoh)]

• Target version set to 2.6

[rogerdpack (Roger Pack)]

could I request an update on this please?

[mame (Yusuke Endoh)]

• Status changed from Assigned to Rejected

望み薄なので一旦閉じます。
今でも必要とお思いでしたら、議論を進める材料（lang: "C++" の方針でのパッチとか）を用意すると良いかも知れません。

[mame (Yusuke Endoh)]

• Related to Feature #4924: mkmf have_header fails with C++ headers added

[mame (Yusuke Endoh)]

• Related to deleted (Feature #4924: mkmf have_header fails with C++ headers)

[mame (Yusuke Endoh)]

• Has duplicate Feature #4924: mkmf have_header fails with C++ headers added