[newlib-cygwin] Cygwin: configure: Add option to disable building 'dumper'

[Jon Turney <jturney@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=1b5fc91a1daa90fb955f57937f4590c5079dd161

commit 1b5fc91a1daa90fb955f57937f4590c5079dd161
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.

Diff:
---
 winsup/configure.ac            | 8 +++++---
 winsup/doc/faq-programming.xml | 3 ++-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/winsup/configure.ac b/winsup/configure.ac
index 9205a8886..7a2121dae 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"])
 
 AC_CONFIG_FILES([
     Makefile
diff --git a/winsup/doc/faq-programming.xml b/winsup/doc/faq-programming.xml
index a24b781cf..24c7f928e 100644
--- a/winsup/doc/faq-programming.xml
+++ b/winsup/doc/faq-programming.xml
@@ -685,7 +685,8 @@ installed; you at least need <literal>gcc-g++</literal>,
 <para>
 Additionally, building the <code>dumper</code> utility requires
 <literal>gettext-devel</literal>, <literal>libiconv-devel</literal>
-<literal>zlib-devel</literal>.
+<literal>zlib-devel</literal>.  Building this program can be disabled with the
+<literal>--disable-dumper</literal> option to <literal>configure</literal>.
 </para>
 
 <para>