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-rwxr-xr-xBuild/source/libs/zziplib/configure51
1 files changed, 51 insertions, 0 deletions
diff --git a/Build/source/libs/zziplib/configure b/Build/source/libs/zziplib/configure
index 83933ff36ea..2674f1c84e5 100755
--- a/Build/source/libs/zziplib/configure
+++ b/Build/source/libs/zziplib/configure
@@ -637,6 +637,7 @@ ZZIPLIB_DEFINES
EGREP
GREP
CPP
+VISIBILITY_CFLAGS
LN_S
RANLIB
host_os
@@ -5103,6 +5104,56 @@ $as_echo "no, using $LN_S" >&6; }
fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking CFLAGS for C to hide external symbols" >&5
+$as_echo_n "checking CFLAGS for C to hide external symbols... " >&6; }
+if ${kpse_cv_visibility_cflags+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+kpse_cv_visibility_cflags=unknown
+kpse_save_flags=$CFLAGS
+cat confdefs.h - <<_ACEOF >conftest.$ac_ext
+/* end confdefs.h. */
+#include <stdio.h>
+ extern void foo(void);
+ void foo(void){printf("foo\n");}
+_ACEOF
+# FIXME: Add tests for non-GNU compilers
+for kpse_flag in '-fvisibility=hidden -fvisibility-inlines-hidden' '-fvisibility=hidden'; do
+ CFLAGS="$kpse_save_flags -Werror $kpse_flag"
+ if ac_fn_c_try_compile "$LINENO"; then :
+ kpse_cv_visibility_cflags=$kpse_flag; break
+fi
+rm -f core conftest.err conftest.$ac_objext
+done
+ac_ext=c
+ac_cpp='$CPP $CPPFLAGS'
+ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5'
+ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5'
+ac_compiler_gnu=$ac_cv_c_compiler_gnu
+
+
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $kpse_cv_visibility_cflags" >&5
+$as_echo "$kpse_cv_visibility_cflags" >&6; }
+CFLAGS=$kpse_save_flags
+case $kpse_cv_visibility_cflags in #(
+ unknown) :
+ ;; #(
+ *) :
+ VISIBILITY_CFLAGS=$kpse_cv_visibility_cflags
+ ;;
+esac
+
+
+
+
+
# Checks for header files.
ac_ext=c
ac_cpp='$CPP $CPPFLAGS'