Daniel's patch for config.h and Windows DLL declarations (not fully working).

git-svn-id: svn://vcs.exim.org/pcre/code/trunk@199 2f5784b3-3f2a-0410-8824-cb99058d5e15

1 files changed, 50 insertions, 0 deletions

diff --git a/pcrecpp_internal.h b/pcrecpp_internal.h
new file mode 100644
index 0000000..f4a7fd5
--- /dev/null
+++ b/pcrecpp_internal.h
@@ -0,0 +1,50 @@
+#ifndef PCRECPP_INTERNAL_H
+#define PCRECPP_INTERNAL_H
+
+/* When compiling a DLL for Windows, the exported symbols have to be declared
+using some MS magic. I found some useful information on this web page:
+http://msdn2.microsoft.com/en-us/library/y4h7bcy6(VS.80).aspx. According to the
+information there, using __declspec(dllexport) without "extern" we have a
+definition; with "extern" we have a declaration. The settings here override the
+setting in pcrecpp.h; it defines only PCRECPP_EXP_DECL, which is all that is
+needed for applications (they just import the symbols). We use:
+
+  PCRECPP_EXP_DECL       for declarations
+  PCRECPP_EXP_DEFN       for definitions of exported functions
+  PCRECPP_EXP_DATA_DEFN  for definitions of exported variables
+
+The reason for the two DEFN macros is that in non-Windows environments, one
+does not want to have "extern" before variable definitions because it leads to
+compiler warnings. So we distinguish between functions and variables. In
+Windows, the two should always be the same.
+
+The reason for wrapping this in #ifndef PCRECPP_EXP_DECL is so that pcretest,
+which is an application, but needs to import this file in order to "peek" at
+internals, can #include pcre.h first to get an application's-eye view.
+
+In principle, people compiling for non-Windows, non-Unix-like (i.e. uncommon,
+special-purpose environments) might want to stick other stuff in front of
+exported symbols. That's why, in the non-Windows case, we set PCRECPP_EXP_DEFN and
+PCRECPP_EXP_DATA_DEFN only if they are not already set. */
+
+#ifndef PCRECPP_EXP_DECL
+#  ifdef _WIN32
+#    ifndef PCRECPP_STATIC
+#      define PCRECPP_EXP_DECL       extern __declspec(dllexport)
+#      define PCRECPP_EXP_DEFN       __declspec(dllexport)
+#      define PCRECPP_EXP_DATA_DEFN  __declspec(dllexport)
+#    else
+#      define PCRECPP_EXP_DECL       extern
+#      define PCRECPP_EXP_DEFN
+#      define PCRECPP_EXP_DATA_DEFN
+#    endif
+#  else
+#    define PCRECPP_EXP_DECL
+#    define PCRECPP_EXP_DEFN
+#    define PCRECPP_EXP_DATA_DEFN
+#  endif
+#endif
+
+#endif
+
+/* End of pcrecpp_internal.h */