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
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