remove undef weak refs to init/fini array symbols in libc.so

[musl] / configure

diff --git a/configure b/configure
index d04c860..ee21771 100755 (executable)
--- a/configure
+++ b/configure
@@ -521,6 +521,10 @@ fi
 tryldflag LDFLAGS_AUTO -Wl,--sort-section,alignment
 tryldflag LDFLAGS_AUTO -Wl,--sort-common
 
+# When linking shared library, drop dummy weak definitions that were
+# replaced by strong definitions from other translation units.
+tryldflag LDFLAGS_AUTO -Wl,--gc-sections
+
 # Some patched GCC builds have these defaults messed up...
 tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 
@@ -530,6 +534,11 @@ tryldflag LDFLAGS_AUTO -Wl,--hash-style=both
 # runtime library; implementation error is also a possibility.
 tryldflag LDFLAGS_AUTO -Wl,--no-undefined
 
+# Avoid exporting symbols from compiler runtime libraries. They
+# should be hidden anyway, but some toolchains including old gcc
+# versions built without shared library support and pcc are broken.
+tryldflag LDFLAGS_AUTO -Wl,--exclude-libs=ALL
+
 test "$shared" = "no" || {
 # Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
 LDFLAGS_DUMMY=