</p><p>
Finally, a few system-specific requirements:
</p><div class="variablelist"><dl class="variablelist"><dt><span class="term">linux</span></dt><dd><p>
+ The 'gnu' locale model makes use of <code class="function">iconv</code>
+ for character set conversions. The relevant functions are provided
+ by Glibc and so are always available, however they can also be
+ provided by the separate GNU libiconv library. If GNU libiconv is
+ found when GCC is built (e.g., because its headers are installed
+ in <code class="filename">/usr/local/include</code>)
+ then the <code class="filename">libstdc++.so.6</code> library will have a
+ run-time dependency on <code class="filename">libiconv.so.2</code>.
+ If you do not want that run-time dependency then you should do
+ one of the following:
+ </p><div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p>
+ Uninstall the libiconv headers before building GCC.
+ Glibc already provides <code class="function">iconv</code> so you should
+ not need libiconv anyway.
+ </p></li><li class="listitem"><p>
+ <a class="link" href="../">
+ Download</a> the libiconv sources and extract them into the
+ top level of the GCC source tree, e.g.,
+ </p><pre class="programlisting">
+wget https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.16.tar.gz
+tar xf libiconv-1.16.tar.gz
+ln -s libiconv-1.16 libiconv
+</pre><p>
+ This will build libiconv as part of building GCC and link to
+ it statically, so there is no <code class="filename">libiconv.so.2</code>
+ dependency.
+ </p></li><li class="listitem"><p>
+ Configure GCC with <code class="option">--with-libiconv-type=static</code>.
+ This requires the static <code class="filename">libiconv.a</code> library,
+ which is not installed by default. You might need to reinstall
+ libiconv using the <code class="option">--enable-static</code> configure
+ option to get the static library.
+ </p></li></ul></div><p>
If GCC 3.1.0 or later on is being used on GNU/Linux, an attempt
will be made to use "C" library functionality necessary for
C++ named locale support. For GCC 4.6.0 and later, this
<listitem>
<para>
+ The 'gnu' locale model makes use of <function>iconv</function>
+ for character set conversions. The relevant functions are provided
+ by Glibc and so are always available, however they can also be
+ provided by the separate GNU libiconv library. If GNU libiconv is
+ found when GCC is built (e.g., because its headers are installed
+ in <filename class="directory">/usr/local/include</filename>)
+ then the <filename>libstdc++.so.6</filename> library will have a
+ run-time dependency on <filename>libiconv.so.2</filename>.
+ If you do not want that run-time dependency then you should do
+ one of the following:
+ </para>
+ <itemizedlist>
+ <listitem>
+ <para>
+ Uninstall the libiconv headers before building GCC.
+ Glibc already provides <function>iconv</function> so you should
+ not need libiconv anyway.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ <link linkend="https://www.gnu.org/software/libiconv/#downloading">
+ Download</link> the libiconv sources and extract them into the
+ top level of the GCC source tree, e.g.,
+ </para>
+<programlisting>
+wget https://ftp.gnu.org/pub/gnu/libiconv/libiconv-1.16.tar.gz
+tar xf libiconv-1.16.tar.gz
+ln -s libiconv-1.16 libiconv
+</programlisting>
+ <para>
+ This will build libiconv as part of building GCC and link to
+ it statically, so there is no <filename>libiconv.so.2</filename>
+ dependency.
+ </para>
+ </listitem>
+ <listitem>
+ <para>
+ Configure GCC with <option>--with-libiconv-type=static</option>.
+ This requires the static <filename>libiconv.a</filename> library,
+ which is not installed by default. You might need to reinstall
+ libiconv using the <option>--enable-static</option> configure
+ option to get the static library.
+ </para>
+ </listitem>
+ </itemizedlist>
+ </listitem>
+
+ <listitem>
+ <para>
If GCC 3.1.0 or later on is being used on GNU/Linux, an attempt
will be made to use "C" library functionality necessary for
C++ named locale support. For GCC 4.6.0 and later, this
$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
--mode=link $(CXX) \
$(VTV_CXXLINKFLAGS) \
- $(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) $(LTLDFLAGS) -o $@
+ $(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) \
+ $(LTLDFLAGS) $(LTLIBICONV) \
+ -o $@
# Symbol versioning for shared libraries.
if ENABLE_SYMVERS
$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) \
--mode=link $(CXX) \
$(VTV_CXXLINKFLAGS) \
- $(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) $(LTLDFLAGS) -o $@
+ $(OPT_LDFLAGS) $(SECTION_LDFLAGS) $(AM_CXXFLAGS) \
+ $(LTLDFLAGS) $(LTLIBICONV) \
+ -o $@
@ENABLE_SYMVERS_TRUE@CLEANFILES = libstdc++-symbols.ver $(version_dep)
@ENABLE_SYMVERS_DARWIN_TRUE@@ENABLE_SYMVERS_TRUE@version_arg = -Wl,-exported_symbols_list,libstdc++-symbols.explist