From 18532ae7128d2a9a8825a6574189b097ee2c0910 Mon Sep 17 00:00:00 2001
From: Andres Mejia <amejia004@gmail.com>
Date: Tue, 5 Feb 2013 17:51:13 -0500
Subject: [PATCH] Fix pcre checks to work on visual studio builds using pcre
 static libraries built using mingw toolchain.

---
 CMakeLists.txt                  | 20 +++++++++++++++++---
 build/cmake/FindPCREPOSIX.cmake | 16 ++++++++++++----
 2 files changed, 29 insertions(+), 7 deletions(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index da8a0bdbf..055992ccf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -976,11 +976,9 @@ IF(NOT FOUND_POSIX_REGEX_LIB AND POSIX_REGEX_LIB MATCHES "^(AUTO|LIBPCREPOSIX)$"
   #
   # If requested, try finding library for PCREPOSIX
   #
+  FIND_PACKAGE(LibGCC)
   FIND_PACKAGE(PCREPOSIX)
   IF(PCREPOSIX_FOUND)
-    SET(HAVE_LIBPCREPOSIX 1)
-    SET(HAVE_LIBPCRE 1)
-    SET(HAVE_PCREPOSIX_H 1)
     INCLUDE_DIRECTORIES(${PCRE_INCLUDE_DIR})
     LIST(APPEND ADDITIONAL_LIBS ${PCREPOSIX_LIBRARIES})
     # Test if a macro is needed for the library.
@@ -991,10 +989,26 @@ IF(NOT FOUND_POSIX_REGEX_LIB AND POSIX_REGEX_LIB MATCHES "^(AUTO|LIBPCREPOSIX)$"
       "WITHOUT_PCRE_STATIC;PCRE_STATIC")
     IF(NOT WITHOUT_PCRE_STATIC AND PCRE_STATIC)
       ADD_DEFINITIONS(-DPCRE_STATIC)
+	ELSEIF(MSVC AND NOT WITHOUT_PCRE_STATIC AND NOT PCRE_STATIC AND LIBGCC_FOUND)
+      # When doing a Visual Studio build using pcre static libraries
+	  # built using the mingw toolchain, -lgcc is needed to resolve
+	  # ___chkstk_ms.
+	  MESSAGE(STATUS "Visual Studio build detected, trying again with -lgcc")
+	  LIST(APPEND ADDITIONAL_LIBS ${LIBGCC_LIBRARIES})
+      SET(TMP_LIBRARIES ${PCREPOSIX_LIBRARIES} ${LIBGCC_LIBRARIES})
+      TRY_MACRO_FOR_LIBRARY(
+        "${PCRE_INCLUDE_DIR}" "${TMP_LIBRARIES}"
+        COMPILES
+        "#include <pcreposix.h>\nint main() {regex_t r;return regcomp(&r, \"\", 0);}"
+        "WITHOUT_PCRE_STATIC;PCRE_STATIC")
+      IF(NOT WITHOUT_PCRE_STATIC AND PCRE_STATIC)
+        ADD_DEFINITIONS(-DPCRE_STATIC)
+      ENDIF(NOT WITHOUT_PCRE_STATIC AND PCRE_STATIC)
     ENDIF(NOT WITHOUT_PCRE_STATIC AND PCRE_STATIC)
   ENDIF(PCREPOSIX_FOUND)
   MARK_AS_ADVANCED(CLEAR PCRE_INCLUDE_DIR)
   MARK_AS_ADVANCED(CLEAR PCREPOSIX_LIBRARIES)
+  MARK_AS_ADVANCED(CLEAR LIBGCC_LIBRARIES)
 ENDIF(NOT FOUND_POSIX_REGEX_LIB AND POSIX_REGEX_LIB MATCHES "^(AUTO|LIBPCREPOSIX)$")
 
 #
diff --git a/build/cmake/FindPCREPOSIX.cmake b/build/cmake/FindPCREPOSIX.cmake
index 9e40620fe..cfcf5bce9 100644
--- a/build/cmake/FindPCREPOSIX.cmake
+++ b/build/cmake/FindPCREPOSIX.cmake
@@ -4,6 +4,7 @@
 #  PCRE_INCLUDE_DIR    - where to find pcreposix.h, etc.
 #  PCREPOSIX_LIBRARIES - List of libraries when using libpcreposix.
 #  PCREPOSIX_FOUND     - True if libpcreposix found.
+#  PCRE_FOUND          - True if libpcre found.
 
 IF (PCRE_INCLUDE_DIR)
   # Already in cache, be silent
@@ -18,8 +19,15 @@ FIND_LIBRARY(PCRE_LIBRARY NAMES pcre libpcre)
 # all listed variables are TRUE
 INCLUDE(FindPackageHandleStandardArgs)
 FIND_PACKAGE_HANDLE_STANDARD_ARGS(PCREPOSIX DEFAULT_MSG PCREPOSIX_LIBRARY PCRE_INCLUDE_DIR)
-FIND_PACKAGE_HANDLE_STANDARD_ARGS(PCRE DEFAULT_MSG PCRE_LIBRARY PCRE_INCLUDE_DIR)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(PCRE DEFAULT_MSG PCRE_LIBRARY)
 
-IF(PCREPOSIX_FOUND AND PCRE_FOUND)
-  SET(PCREPOSIX_LIBRARIES ${PCREPOSIX_LIBRARY} ${PCRE_LIBRARY})
-ENDIF(PCREPOSIX_FOUND AND PCRE_FOUND)
+IF(PCREPOSIX_FOUND)
+  SET(PCREPOSIX_LIBRARIES ${PCREPOSIX_LIBRARY})
+  SET(HAVE_LIBPCREPOSIX 1)
+  SET(HAVE_PCREPOSIX_H 1)
+ENDIF(PCREPOSIX_FOUND)
+
+IF(PCRE_FOUND)
+  SET(PCREPOSIX_LIBRARIES ${PCREPOSIX_LIBRARIES} ${PCRE_LIBRARY})
+  SET(HAVE_LIBPCRE 1)
+ENDIF(PCRE_FOUND)
-- 
2.47.2