build: Use an export symbols file if there is no version script support

We generate the symbol list from the version script to avoid repeating
ourselves and potentially getting the lists out-of-sync.

diff --git a/src/Makefile.am b/src/Makefile.am
index b892ab8db0a4bfcaed850bbf89f9e288e1dda47e..bc1add60a4b8943cf3678f3903249ddf48374b87 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -66,6 +66,13 @@ if HAVE_LINKER_VERSION_SCRIPT
 libbsd_la_LDFLAGS += \
        -Wl,--version-script=$(srcdir)/libbsd.map \
        # EOL
+else
+libbsd_la_LDFLAGS += \
+       -export-symbols libbsd.sym \
+       # EOL
+EXTRA_libbsd_la_DEPENDENCIES += \
+       libbsd.sym \
+       # EOL
 endif
 libbsd_la_SOURCES = \
        arc4random.c \
@@ -136,10 +143,19 @@ CLEANFILES += \
        # EOL
 endif
 
+DISTCLEANFILES = \
+       libbsd.sym \
+       # EOL
+
 libbsd_ctor_a_SOURCES = \
        setproctitle_ctor.c \
        # EOL
 
+# Generate a simple libtool symbol export list to be used as a fallback if
+# there is no version script support.
+libbsd.sym: libbsd.map
+       $(AM_V_GEN) $(SED) -ne 's/^[[:space:]]\{1,\}\([A-Za-z0-9_]\{1,\}\);/\1/p' libbsd.map > $@
+
 if NEED_TRANSPARENT_LIBMD
 TRANSPARENT_LIBMD_DEPENDS = format.ld