From 04f442f755fbfb317f6790e36686e05c4c906ba0 Mon Sep 17 00:00:00 2001
From: Chuck Atkins <chuck.atkins@kitware.com>
Date: Tue, 4 Nov 2014 11:01:56 -0500
Subject: [PATCH] Workaround for short jump tables on PA-RISC.

The PA-RISC architecture requires special options for GCC to prevent
linker errors when libraries reach a certain size and / or complexity.
See http://mraw.org/blog/2007/10/10/Linking_on_hppa and gcc
documentation on -mlong-calls.
---
 CompileFlags.cmake | 16 ++++++++++------
 bootstrap          | 39 ++++++++++++++++++++++++++++-----------
 2 files changed, 38 insertions(+), 17 deletions(-)

diff --git a/CompileFlags.cmake b/CompileFlags.cmake
index a4a4a78c9..7e9fb16c8 100644
--- a/CompileFlags.cmake
+++ b/CompileFlags.cmake
@@ -65,6 +65,16 @@ if(CMAKE_SYSTEM_NAME MATCHES "HP-UX" AND CMAKE_CXX_COMPILER_ID MATCHES "HP")
   endif()
 endif()
 
+# Workaround for short jump tables on PA-RISC
+if(CMAKE_SYSTEM_PROCESSOR MATCHES "^parisc")
+  if(CMAKE_COMPILER_IS_GNUC)
+    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mlong-calls")
+  endif()
+  if(CMAKE_COMPILER_IS_GNUCXX)
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mlong-calls")
+  endif()
+endif()
+
 # use the ansi CXX compile flag for building cmake
 if (CMAKE_ANSI_CXXFLAGS)
   set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_ANSI_CXXFLAGS}")
@@ -74,10 +84,4 @@ if (CMAKE_ANSI_CFLAGS)
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}")
 endif ()
 
-# avoid binutils problem with large binaries, e.g. when building CMake in debug mode
-# See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50230
-if (CMAKE_SYSTEM_NAME STREQUAL Linux AND CMAKE_SYSTEM_PROCESSOR STREQUAL parisc)
-  set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,--unique=.text._*")
-endif ()
-
 include (${CMAKE_ROOT}/Modules/CMakeBackwardCompatibilityCXX.cmake)
diff --git a/bootstrap b/bootstrap
index b09023dbf..94bed0ecf 100755
--- a/bootstrap
+++ b/bootstrap
@@ -122,17 +122,32 @@ else
   cmake_system_openvms=false
 fi
 
+# Determine whether this is HP-UX
+if echo "${cmake_system}" | grep HP-UX >/dev/null 2>&1; then
+  cmake_system_hpux=true
+else
+  cmake_system_hpux=false
+fi
+
 # Determine whether this is Linux
 if echo "${cmake_system}" | grep Linux >/dev/null 2>&1; then
   cmake_system_linux=true
-  # find out if it is a HP PA-RISC machine
-  if uname -m | grep parisc >/dev/null 2>&1; then
-    cmake_machine_parisc=true
-  else
-    cmake_machine_parisc=false
-  fi
 else
   cmake_system_linux=false
+ fi
+
+# Determine whether this is a PA-RISC machine
+# This only works for Linux or HP-UX, not other PA-RISC OSs (BSD maybe?). Also
+# may falsely detect parisc on HP-UX m68k
+cmake_machine_parisc=false
+if ${cmake_system_linux}; then
+  if uname -m | grep parisc >/dev/null 2>&1; then
+    cmake_machine_parisc=true
+  fi
+elif ${cmake_system_hpux}; then
+  if !(uname -m | grep ia64 >/dev/null 2>&1); then
+    cmake_machine_parisc=true
+  fi
 fi
 
 # Choose the generator to use for bootstrapping.
@@ -744,11 +759,13 @@ if ${cmake_system_haiku}; then
   cmake_ld_flags="${LDFLAGS} -lroot -lbe"
 fi
 
-if ${cmake_system_linux}; then
-  # avoid binutils problem with large binaries, e.g. when building CMake in debug mode
-  # See http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50230
-  if ${cmake_machine_parisc}; then
-    cmake_ld_flags="${LDFLAGS} -Wl,--unique=.text._*"
+# Workaround for short jump tables on PA-RISC
+if ${cmake_machine_parisc}; then
+  if ${cmake_c_compiler_is_gnu}; then
+    cmake_c_flags="${CFLAGS} -mlong-calls"
+  fi
+  if ${cmake_cxx_compiler_is_gnu}; then
+    cmake_cxx_flags="${CXXFLAGS} -mlong-calls"
   fi
 fi