app-emulation/dosemu: fix LTO build, bug #700126

Reported-by: Robert Gill
Closes: https://bugs.gentoo.org/700126
Package-Manager: Portage-2.3.79, Repoman-2.3.18
Signed-off-by: Sergei Trofimovich <[email protected]>

app-emulation/dosemu/dosemu-1.4.1_pre20130107-r5.ebuild

@@ -54,6 +54,7 @@ PATCHES=(
  "${FILESDIR}"/${P}-flex-2.6.3.patch
  "${FILESDIR}"/${P}-ia16-ldflags.patch
  "${FILESDIR}"/${P}-fix-inline.patch
+ "${FILESDIR}"/${P}-lto.patch
 )
 
 src_prepare() {

app-emulation/dosemu/files/dosemu-1.4.1_pre20130107-lto.patch

@@ -0,0 +1,27 @@
+'asmlinkage' macros are supposed to make symbol available
+for calling from inline (or not) assembly.
+
+'static' keyword is not compatible to it and breaks -flto
+when gcc's LTO partitioner separates assembly definitions
+from C definitions. This causes symbol resolution failures:
+
+ ld: /tmp/dosemu.bin.h8Y59G.ltrans0.ltrans.o: in function `stub_rep__':
+ <artificial>:(.text+0xe): undefined reference to `rep_movs_stos'
+
+The changes turns 'asmlinkage' into exported symbol.
+
+https://bugs.gentoo.org/700126
+--- a/src/emu-i386/simx86/cpatch.c
++++ b/src/emu-i386/simx86/cpatch.c
+@@ -37,9 +37,9 @@
+ #include "codegen-arch.h"
+
+ #ifdef __i386__
+-#define asmlinkage static __attribute__((used)) __attribute__((cdecl))
++#define asmlinkage __attribute__((used)) __attribute__((cdecl))
+ #else
+-#define asmlinkage static __attribute__((used))
++#define asmlinkage __attribute__((used))
+ #endif
+
+ int s_munprotect(unsigned int addr)