From 2efec4ce7bb31524d55596051adfe9fc3d6dacb1 Mon Sep 17 00:00:00 2001
From: jbarlow83 <jbarlow83@users.noreply.github.com>
Date: Mon, 11 Mar 2019 15:28:29 -0700
Subject: Fix C++ exception handling when -fvisibility=hidden (#302)

Fix C++ exception handling when -fvisibility=hidden

Ensure that QPDFExc and QPDFSystemError are marked visible, so that their typeinfo will not be
suppressed when -fvisibility=hidden.

Details:
    https://gcc.gnu.org/wiki/Visibility
---
 include/qpdf/DLL.h              | 5 +++++
 include/qpdf/QPDFExc.hh         | 2 +-
 include/qpdf/QPDFSystemError.hh | 2 +-
 3 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/qpdf/DLL.h b/include/qpdf/DLL.h
index ccd05fce..1e5d8a1a 100644
--- a/include/qpdf/DLL.h
+++ b/include/qpdf/DLL.h
@@ -25,8 +25,13 @@
 
 #if defined(_WIN32) && defined(DLL_EXPORT)
 # define QPDF_DLL __declspec(dllexport)
+# define QPDF_DLL_EXCEPTION
+#elif __GNUC__ >= 4
+# define QPDF_DLL __attribute__ ((visibility ("default")))
+# define QPDF_DLL_EXCEPTION __attribute__ ((visibility ("default")))
 #else
 # define QPDF_DLL
+# define QPDF_DLL_EXCEPTION
 #endif
 
 #endif /* QPDF_DLL_HH */
diff --git a/include/qpdf/QPDFExc.hh b/include/qpdf/QPDFExc.hh
index fe0aa1d5..c538eb4d 100644
--- a/include/qpdf/QPDFExc.hh
+++ b/include/qpdf/QPDFExc.hh
@@ -29,7 +29,7 @@
 #include <string>
 #include <stdexcept>
 
-class QPDFExc: public std::runtime_error
+class QPDF_DLL_EXCEPTION QPDFExc: public std::runtime_error
 {
   public:
     QPDF_DLL
diff --git a/include/qpdf/QPDFSystemError.hh b/include/qpdf/QPDFSystemError.hh
index c4e48713..cef8ea08 100644
--- a/include/qpdf/QPDFSystemError.hh
+++ b/include/qpdf/QPDFSystemError.hh
@@ -29,7 +29,7 @@
 #include <string>
 #include <stdexcept>
 
-class QPDFSystemError: public std::runtime_error
+class QPDF_DLL_EXCEPTION QPDFSystemError: public std::runtime_error
 {
   public:
     QPDF_DLL
-- 
cgit v1.2.3-54-g00ecf