Cygwin: dumper: also link with libzstd, as libbfd may require it

Also allow that linkage to be dynamic, as libzstd-devel doesn't
currently provide a static library.

5 files changed, 11 insertions, 10 deletions

diff --git a/.appveyor.yml b/.appveyor.yml
index 50a9101b7..9f20f6d83 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -35,6 +35,7 @@ patch,\
 cocom,\

 gettext-devel,\

 libiconv-devel,\

+libzstd-devel,\

 zlib-devel,\

 %PKGARCH%-gcc-core,\

 %PKGARCH%-gcc-g++,\

diff --git a/.github/workflows/cygwin.yml b/.github/workflows/cygwin.yml
index 10d0255ef..575ff1fdc 100644
--- a/.github/workflows/cygwin.yml
+++ b/.github/workflows/cygwin.yml
@@ -81,6 +81,7 @@ jobs:
           gettext-devel,
           libiconv,
           libiconv-devel,
+          libzstd-devel,
           make,
           mingw64-${{ matrix.pkgarch }}-gcc-g++,
           mingw64-${{ matrix.pkgarch }}-zlib,
diff --git a/winsup/configure.ac b/winsup/configure.ac
index 76baf0a7d..13fce0da6 100644
--- a/winsup/configure.ac
+++ b/winsup/configure.ac
@@ -118,10 +118,12 @@ AC_ARG_ENABLE([dumper],
 
 AM_CONDITIONAL(BUILD_DUMPER, [test "x$build_dumper" = "xyes"])
 
-AC_CHECK_LIB([sframe], [sframe_decode],
-	     AC_MSG_NOTICE([Detected libsframe; Assuming that libbfd depends on it]), [true])
-
-AM_CONDITIONAL(HAVE_LIBSFRAME, [test "x$ac_cv_lib_sframe_sframe_decode" = "xyes"])
+# libbfd.a doesn't have a pkgconfig file, so we guess what it's dependencies
+# are, based on what's present in the build environment
+BFD_LIBS="-lintl -liconv -liberty -lz"
+AC_CHECK_LIB([sframe], [sframe_decode], [BFD_LIBS="${BFD_LIBS} -lsframe"])
+AC_CHECK_LIB([zstd], [ZSTD_isError], [BFD_LIBS="${BFD_LIBS} -lzstd"])
+AC_SUBST([BFD_LIBS])
 
 AC_CONFIG_FILES([
     Makefile
diff --git a/winsup/doc/faq-programming.xml b/winsup/doc/faq-programming.xml
index 24c7f928e..7fc6baf25 100644
--- a/winsup/doc/faq-programming.xml
+++ b/winsup/doc/faq-programming.xml
@@ -684,7 +684,7 @@ 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>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>
diff --git a/winsup/utils/Makefile.am b/winsup/utils/Makefile.am
index f59cf9f50..57a4f377c 100644
--- a/winsup/utils/Makefile.am
+++ b/winsup/utils/Makefile.am
@@ -79,7 +79,8 @@ LDADD = -lnetapi32
 cygpath_CXXFLAGS = -fno-threadsafe-statics $(AM_CXXFLAGS)
 cygpath_LDADD = $(LDADD) -luserenv -lntdll
 dumper_CXXFLAGS = -I$(top_srcdir)/../include $(AM_CXXFLAGS)
-dumper_LDADD = $(LDADD) -lpsapi -lbfd -lintl -liconv -liberty -lz -lntdll
+dumper_LDADD = $(LDADD) -lpsapi -lntdll -lbfd @BFD_LIBS@
+dumper_LDFLAGS =
 ldd_LDADD = $(LDADD) -lpsapi -lntdll
 mount_CXXFLAGS = -DFSTAB_ONLY $(AM_CXXFLAGS)
 minidumper_LDADD = $(LDADD) -ldbghelp
@@ -89,10 +90,6 @@ profiler_LDADD = $(LDADD) -lntdll
 cygps_LDADD = $(LDADD) -lpsapi -lntdll
 newgrp_LDADD = $(LDADD) -luserenv
 
-if HAVE_LIBSFRAME
-dumper_LDADD += -lsframe
-endif
-
 if CROSS_BOOTSTRAP
 SUBDIRS = mingw
 endif