plugin: add API symbols to qemu-plugins.symbols

Signed-off-by: Emilio G. Cota <cota@braap.org>
[AJB: moved into plugins]
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 72 insertions, 0 deletions

diff --git a/configure b/configure
index 2995559ed2..eabe84af6e 100755
--- a/configure
+++ b/configure
@@ -30,6 +30,7 @@ TMPO="${TMPDIR1}/${TMPB}.o"
 TMPCXX="${TMPDIR1}/${TMPB}.cxx"
 TMPE="${TMPDIR1}/${TMPB}.exe"
 TMPMO="${TMPDIR1}/${TMPB}.mo"
+TMPTXT="${TMPDIR1}/${TMPB}.txt"
 
 rm -f config.log
 
@@ -5476,6 +5477,61 @@ if compile_prog "" "" ; then
   atomic64=yes
 fi
 
+#########################################
+# See if --dynamic-list is supported by the linker
+ld_dynamic_list="no"
+if test "$static" = "no" ; then
+    cat > $TMPTXT <<EOF
+{
+  foo;
+};
+EOF
+
+    cat > $TMPC <<EOF
+#include <stdio.h>
+void foo(void);
+
+void foo(void)
+{
+  printf("foo\n");
+}
+
+int main(void)
+{
+  foo();
+  return 0;
+}
+EOF
+
+    if compile_prog "" "-Wl,--dynamic-list=$TMPTXT" ; then
+        ld_dynamic_list="yes"
+    fi
+fi
+
+#########################################
+# See if -exported_symbols_list is supported by the linker
+
+ld_exported_symbols_list="no"
+if test "$static" = "no" ; then
+    cat > $TMPTXT <<EOF
+  _foo
+EOF
+
+    if compile_prog "" "-Wl,-exported_symbols_list,$TMPTXT" ; then
+        ld_exported_symbols_list="yes"
+    fi
+fi
+
+if  test "$plugins" = "yes" &&
+    test "$ld_dynamic_list" = "no" &&
+    test "$ld_exported_symbols_list" = "no" ; then
+  error_exit \
+      "Plugin support requires dynamic linking and specifying a set of symbols " \
+      "that are exported to plugins. Unfortunately your linker doesn't " \
+      "support the flag (--dynamic-list or -exported_symbols_list) used " \
+      "for this purpose. You can't build with --static."
+fi
+
 ########################################
 # See if 16-byte vector operations are supported.
 # Even without a vector unit the compiler may expand these.
@@ -7283,6 +7339,22 @@ fi
 if test "$plugins" = "yes" ; then
     echo "CONFIG_PLUGIN=y" >> $config_host_mak
     LIBS="-ldl $LIBS"
+    # Copy the export object list to the build dir
+    if test "$ld_dynamic_list" = "yes" ; then
+	echo "CONFIG_HAS_LD_DYNAMIC_LIST=yes" >> $config_host_mak
+	ld_symbols=qemu-plugins-ld.symbols
+	cp "$source_path/plugins/qemu-plugins.symbols" $ld_symbols
+    elif test "$ld_exported_symbols_list" = "yes" ; then
+	echo "CONFIG_HAS_LD_EXPORTED_SYMBOLS_LIST=yes" >> $config_host_mak
+	ld64_symbols=qemu-plugins-ld64.symbols
+	echo "# Automatically generated by configure - do not modify" > $ld64_symbols
+	grep 'qemu_' "$source_path/plugins/qemu-plugins.symbols" | sed 's/;//g' | \
+	    sed -E 's/^[[:space:]]*(.*)/_\1/' >> $ld64_symbols
+    else
+	error_exit \
+	    "If \$plugins=yes, either \$ld_dynamic_list or " \
+	    "\$ld_exported_symbols_list should have been set to 'yes'."
+    fi
 fi
 
 if test "$tcg_interpreter" = "yes"; then