If not, throw an error unless symbol versioning was explicitly
disabled.
(Reposting rebased patch, as v2 apparently slipped)
Signed-off-by: Ulf Hermann <ulf.herm...@qt.io>
---
ChangeLog | 4 ++++
configure.ac | 15 +++++++++++++++
2 files changed, 19 insertions(+)
diff --git a/ChangeLog b/ChangeLog
index d2695721..b720f2cd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2017-05-03 Ulf Hermann <ulf.herm...@qt.io>
+
+ * configure.ac: Test if symbol versioning is supported.
+
2017-08-18 Ulf Hermann <ulf.herm...@qt.io>
* configure.ac: Check if the compiler supports
diff --git a/configure.ac b/configure.ac
index 25ab19b3..4ab8816a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -386,6 +386,21 @@ AS_IF([test "x$enable_textrelcheck" != "xno"],
AC_ARG_ENABLE([symbol-versioning],
AS_HELP_STRING([--disable-symbol-versioning],
[Disable symbol versioning in shared objects]))
+
+AC_CACHE_CHECK([whether symbol versioning is supported],
ac_cv_symbol_versioning, [dnl
+AC_COMPILE_IFELSE([AC_LANG_SOURCE([dnl
+#define NEW_VERSION(name, version) \
+ asm (".symver " #name "," #name "@@@" #version);
+int foo(int x) { return x + 1; }
+NEW_VERSION (foo, ELFUTILS_12.12)
+])], ac_cv_symbol_versioning=yes, ac_cv_symbol_versioning=no)])
+if test "$ac_cv_symbol_versioning" = "no"; then
+ if test "x$enable_symbol_versioning" != "xno"; then
+ AC_MSG_ERROR([Symbol versioning is not supported.
+ Use --disable-symbol-versioning to build without.])
+ fi
+fi
+
AM_CONDITIONAL(SYMBOL_VERSIONING, [test "x$enable_symbol_versioning" != "xno"])
AS_IF([test "x$enable_symbol_versioning" = "xno"],
[AC_MSG_WARN([Disabling symbol versioning breaks ABI compatibility.])
--
2.11.0
