Disable building of elf-specific code on Mach-O systems.

The only Mach-O system supported is Darwin.

configure.ac

@@ -296,7 +296,17 @@ else
 fi
 
 AM_CONDITIONAL(DYNAMIC, test "$with_staticonly" != "no")
-AM_CONDITIONAL(LIBELF_BUNDLED, test "$libelf_bundled" != "no")
+
+dnl Select appropriate ABI
+AS_CASE(
+	[$host_os],
+	[darwin*],
+	[ac_cv_binary_abi=macho],
+	[ac_cv_binary_abi=elf]
+)
+AM_CONDITIONAL(HAVE_MACHO_ABI, test "$ac_cv_binary_abi" = "macho")
+AM_CONDITIONAL(HAVE_ELF_ABI, test "$ac_cv_binary_abi" = "elf")
+AM_CONDITIONAL(LIBELF_BUNDLED, test "$ac_cv_binary_abi" = "elf" -a "$libelf_bundled" != "no")
 
 AC_SUBST([LIBJAIL_LIB])
 AC_SUBST([LIBEXECINFO_LIB])

external/Makefile.am

@@ -226,6 +226,7 @@ libsqlite_static_la_SOURCES=	$(libsqlite_la_SOURCES)
 libsqlite_static_la_CFLAGS=	$(sqlite_common_cflags) -static
 libsqlite_static_la_LDFLAGS=	-all-static
 
+if HAVE_ELF_ABI
 CLEANFILES=	libelf/libelf_fsize.c \
 			libelf/libelf_msize.c \
 			libelf/libelf_convert.c \
@@ -248,3 +249,4 @@ libelf/libelf_msize.c:
 	@m4 -D SRCDIR=$(srcdir)/libelf $(srcdir)/libelf/elf_types.m4 $(srcdir)/libelf/libelf_msize.m4 > $@
 libelf/native-elf-format.h:
 	$(srcdir)/libelf/native-elf-format > libelf/native-elf-format.h
+endif

libpkg/Makefile.am

@@ -20,7 +20,6 @@ endif
 libpkg_la_SOURCES=	pkg.c \
 			backup.c \
 			dns_utils.c \
-			elfhints.c \
 			fetch.c \
 			packing.c \
 			pkg_add.c \
@@ -31,7 +30,6 @@ libpkg_la_SOURCES=	pkg.c \
 			pkg_cudf.c \
 			pkg_create.c \
 			pkg_delete.c \
-			pkg_elf.c \
 			pkg_event.c \
 			pkg_jobs.c \
 			pkg_jobs_conflicts.c \
@@ -59,6 +57,16 @@ libpkg_la_SOURCES=	pkg.c \
 			pkg_old.c \
 			merge3.c \
 			diff.c
+
+if HAVE_ELF_ABI
+libpkg_la_SOURCES+=	elfhints.c \
+			pkg_elf.c
+endif
+
+if HAVE_MACHO_ABI
+# TODO
+endif
+
 libpkg_la_CFLAGS=	$(pkg_common_cflags) -shared
 libpkg_la_LIBADD=	$(top_builddir)/compat/libbsd_compat.la \
 			$(top_builddir)/external/libucl.la \
@@ -75,11 +83,14 @@ libpkg_la_LIBADD=	$(top_builddir)/compat/libbsd_compat.la \
 			-lssl \
 			-lcrypto \
 			-lm
+
+if HAVE_ELF_ABI
 if LIBELF_BUNDLED
 libpkg_la_LIBADD+=	$(top_builddir)/external/libelf.la
 else
 libpkg_la_LIBADD+=	-lelf
 endif
+endif
 
 libpkg_la_LDFLAGS=	-version-info @LIBPKG_SO_VERSION@
 EXTRA_libpkg_la_DEPENDENCIES=	@REPOS_LDADD@