[newlib-cygwin/cygwin-3_4-branch] Cygwin: configure: Add option to disable building 'dumper'

[Jon Turney]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=d7a76c6b6460efa26c690aaa97a1843c9391d19f

commit d7a76c6b6460efa26c690aaa97a1843c9391d19f
Author: Jon Turney <jon.turney@dronecode.org.uk>
Date:   Tue Dec 13 23:17:48 2022 +0000

    Cygwin: configure: Add option to disable building 'dumper'
    
    Rather than guessing, based on just the presence of libbfd, add an
    explicit configuration option, to build dumper or not, defaulting to
    building it.
    
    This might have some use when bootstrapping Cygwin for a new
    architecture, or when building your own Cygwin-targetted cross-compiler,
    rather than installing one from the copr, along with the dependencies of
    libbfd.
    
    (cherry picked from commit 1b5fc91a1daa90fb955f57937f4590c5079dd161)

Diff:
---
 winsup/configure.ac            |  8 +++++---
 winsup/doc/faq-programming.xml | 10 ++++++++--
 2 files changed, 13 insertions(+), 5 deletions(-)

diff --git a/winsup/configure.ac b/winsup/configure.ac
index 49a8346fa..132028d0d 100644
--- a/winsup/configure.ac
+++ b/winsup/configure.ac
@@ -111,10 +111,12 @@ AM_CONDITIONAL(CROSS_BOOTSTRAP, [test "x$with_cross_bootstrap" != "xyes"])
 
 AC_EXEEXT
 
-AC_CHECK_LIB([bfd], [bfd_init], [true],
-	     AC_MSG_WARN([Not building dumper.exe since some required libraries or headers are missing]))
+AC_ARG_ENABLE([dumper],
+	      [AS_HELP_STRING([--disable-dumper], [do not build the 'dumper' utility])],
+	      [build_dumper=$enableval],
+	      [build_dumper=yes])
 
-AM_CONDITIONAL(BUILD_DUMPER, [test "x$ac_cv_lib_bfd_bfd_init" = "xyes"])
+AM_CONDITIONAL(BUILD_DUMPER, [test "x$build_dumper" = "xyes"])
 
 # libbfd.a doesn't have a pkgconfig file, so we guess what it's dependencies
 # are, based on what's present in the build environment
diff --git a/winsup/doc/faq-programming.xml b/winsup/doc/faq-programming.xml
index d23f32c3a..478cf997f 100644
--- a/winsup/doc/faq-programming.xml
+++ b/winsup/doc/faq-programming.xml
@@ -679,8 +679,14 @@ rewriting the runtime library in question from specs...
 installed; you at least need <literal>gcc-g++</literal>,
 <literal>make</literal>, <literal>automake</literal>,
 <literal>autoconf</literal>, <literal>git</literal>, <literal>perl</literal>,
-<literal>gettext-devel</literal>, <literal>libiconv-devel</literal>, <literal>libzstd-devel</literal>,
-<literal>zlib-devel</literal>, <literal>cocom</literal> and <literal>patch</literal>.
+<literal>cocom</literal> and <literal>patch</literal>.
+</para>
+
+<para>
+Additionally, building the <code>dumper</code> utility requires
+<literal>gettext-devel</literal>, <literal>libiconv-devel</literal>, <literal>libzstd-devel</literal> and
+<literal>zlib-devel</literal>.  Building this program can be disabled with the
+<literal>--disable-dumper</literal> option to <literal>configure</literal>.
 </para>
 
 <para>