libstdc++: Use LTLIBICONV when linking libstdc++.so [PR93602]
This fixes missing libiconv symbols when libstdc++ is built on a system that has libiconv installed. If the libiconv headers are found then libstdc++ depends on libiconv_open etc instead of libc's iconv_open. But without this fix libstdc++ is not linked to the libiconv library that provides the definitions of those symbols. As discussed in PR 93602 this changed means that libstdc++.so.6 might have an rpath pointing to the location of the libiconv.so library. If that is not desired, then GCC must be configured to link to a static libiconv.a instead, using either --with-libiconv-type=static or an in-tree build of libiconv. libstdc++-v3/ChangeLog: PR libstdc++/93602 * doc/xml/manual/prerequisites.xml: Document libiconv workarounds. * doc/html/manual/setup.html: Regenerate. * src/Makefile.am (CXXLINK): Add $(LTLIBICONV). * src/Makefile.in: Regenerate.
This commit is contained in:
parent
4d4eaa77a7
commit
c644b7df11
@ -42,6 +42,39 @@
|
||||
</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
|
||||
|
@ -48,6 +48,56 @@
|
||||
<varlistentry>
|
||||
<term>linux</term>
|
||||
|
||||
<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
|
||||
|
@ -278,7 +278,9 @@ CXXLINK = \
|
||||
$(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
|
||||
|
@ -643,7 +643,9 @@ CXXLINK = \
|
||||
$(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
|
||||
|
Loading…
Reference in New Issue
Block a user