From 554b34927cd6a2e0c0ce227108ebf8521bcba889 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Sun, 21 Apr 2013 08:29:17 +0200
Subject: Add 'cmake/glibc-compat-symbols.h' to force usage of minimal GLIBC
 symbols currently for memcpy only, used in our x86_32 and default gcc
 toolchain cmake file.

Note: JogAmp's minimum GLIBC is 2.4 due to '__stack_chk_fail' (stack overflow checking)

  GLIBC 2.4 - March 2006  - Standard for LSB 4.0, Used in SLES 10

We could add compile/link option '-fno-stack-protector', however stack protection seems reasonable
and a pre 2006 distribution a bit too 'far fetched' for our multimedia bindings anyway.
---
 cmake/glibc-compat-symbols.h      | 15 +++++++++++++++
 cmake/toolchain.gcc-default.cmake |  5 +++++
 cmake/toolchain.gcc-x86_32.cmake  |  2 +-
 3 files changed, 21 insertions(+), 1 deletion(-)
 create mode 100644 cmake/glibc-compat-symbols.h

(limited to 'cmake')

diff --git a/cmake/glibc-compat-symbols.h b/cmake/glibc-compat-symbols.h
new file mode 100644
index 00000000..482e2326
--- /dev/null
+++ b/cmake/glibc-compat-symbols.h
@@ -0,0 +1,15 @@
+#ifndef __GLIBC_COMPAT_SYMBOLS_H__
+#define __GLIBC_COMPAT_SYMBOLS_H__ 1
+ 
+/**
+ * add other architecures below
+ */
+#ifdef __amd64__
+   #define GLIBC_COMPAT_SYMBOL(FFF) __asm__(".symver " #FFF "," #FFF "@GLIBC_2.2.5");
+#else
+   #define GLIBC_COMPAT_SYMBOL(FFF) __asm__(".symver " #FFF "," #FFF "@GLIBC_2.0");
+#endif /*__amd64__*/
+
+GLIBC_COMPAT_SYMBOL(memcpy)
+ 
+#endif /*__GLIBC_COMPAT_SYMBOLS_H__*/
diff --git a/cmake/toolchain.gcc-default.cmake b/cmake/toolchain.gcc-default.cmake
index 0f3c4ff6..3b2c9cfd 100644
--- a/cmake/toolchain.gcc-default.cmake
+++ b/cmake/toolchain.gcc-default.cmake
@@ -1,5 +1,10 @@
 # For normal gcc compilation, but use static-libgcc
 
+set(CMAKE_C_FLAGS "-include ${CMAKE_MODULE_PATH}/glibc-compat-symbols.h")
+
+set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c++ flags")
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
+
 set(LINKER_FLAGS "-static-libgcc")
 
 set(CMAKE_SHARED_LINKER_FLAGS "${LINKER_FLAGS}" CACHE STRING "linker flags" FORCE)
diff --git a/cmake/toolchain.gcc-x86_32.cmake b/cmake/toolchain.gcc-x86_32.cmake
index 33dee0e8..890f6e11 100644
--- a/cmake/toolchain.gcc-x86_32.cmake
+++ b/cmake/toolchain.gcc-x86_32.cmake
@@ -4,7 +4,7 @@ set(CMAKE_SYSTEM_PROCESSOR "x86")
 
 link_directories("/usr/lib32")
 
-set(CMAKE_C_FLAGS "-m32")
+set(CMAKE_C_FLAGS "-m32 -include ${CMAKE_MODULE_PATH}/glibc-compat-symbols.h")
 
 set(CMAKE_CXX_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c++ flags")
 set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS}" CACHE STRING "c flags")
-- 
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