math: fix fma bug on x86 (found by Bruno Haible with gnulib)

[musl] / configure

diff --git a/configure b/configure
index f765ca7..7e5a8df 100755 (executable)
--- a/configure
+++ b/configure
@@ -267,6 +267,13 @@ fi
 tryflag CFLAGS_AUTO -fno-stack-protector
 tryldflag LDFLAGS_AUTO -Wl,--hash-style=sysv
 
+# Disable dynamic linking if ld is broken and can't do -Bsymbolic-functions
+LDFLAGS_DUMMY=
+tryldflag LDFLAGS_DUMMY -Wl,-Bsymbolic-functions || {
+printf "warning: disabling dynamic linking support\n"
+shared=no
+}
+
 
 printf "creating config.mak... "