genode/tool/patches/gcc-4.9.2/config.patch

diff --git a/gcc/config.gcc b/gcc/config.gcc
index b7ebc07..5acf469 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -1060,7 +1060,7 @@ arm*-*-eabi* | arm*-*-symbianelf* | arm*-*-rtems*)
 	case ${target} in
 	arm*-*-eabi*)
 	  tm_file="$tm_file newlib-stdint.h"
-	  tmake_file="${tmake_file} arm/t-bpabi"
+	  tmake_file="${tmake_file} arm/t-bpabi t-slibgcc"
 	  use_gcc_stdint=wrap
 	  ;;
 	arm*-*-rtems*)
@@ -1969,7 +1969,7 @@ riscv*-*-linux*)				# Linux RISC-V
 	;;
 riscv*-*-elf*)				# Linux RISC-V
 	tm_file="elfos.h newlib-stdint.h ${tm_file} riscv/elf.h"
-	tmake_file="${tmake_file} riscv/t-elf"
+	tmake_file="${tmake_file} riscv/t-elf t-slibgcc"
 	gnu_ld=yes
 	gas=yes
 	gcc_cv_initfini_array=yes
@@ -2915,7 +2915,7 @@ i[34567]86-*-linux* | x86_64-*-linux*)
 	tmake_file="${tmake_file} i386/t-pmm_malloc i386/t-i386"
 	;;
 i[34567]86-*-* | x86_64-*-*)
-	tmake_file="${tmake_file} i386/t-gmm_malloc i386/t-i386"
+	tmake_file="${tmake_file} i386/t-gmm_malloc i386/t-i386 t-slibgcc"
 	;;
 powerpc*-*-* | rs6000-*-*)
 	tm_file="${tm_file} rs6000/option-defaults.h"
diff --git a/gcc/config/arm/unknown-elf.h b/gcc/config/arm/unknown-elf.h
index ec6f9a4..579172d 100644
--- a/gcc/config/arm/unknown-elf.h
+++ b/gcc/config/arm/unknown-elf.h
@@ -94,3 +94,19 @@
    which will depend on abort, which is defined in libc.  */ 
 #undef LINK_GCC_C_SEQUENCE_SPEC
 #define LINK_GCC_C_SEQUENCE_SPEC "--start-group %G %L --end-group"
+
+/* genode.h */
+
+/*
+ * The 'LINK_SPEC' define comprises the rules of how the GCC frontend invokes
+ * the linker.
+ */
+
+#undef LINK_SPEC
+#define LINK_SPEC \
+  "%(shared:-shared) \
+   %{!static:--eh-frame-hdr}"
+
+/* Don't assume anything about the header files.  */
+/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57699 */
+#define NO_IMPLICIT_EXTERN_C
diff --git a/gcc/config/i386/x86-64.h b/gcc/config/i386/x86-64.h
index 16fc685..85b07bb 100644
--- a/gcc/config/i386/x86-64.h
+++ b/gcc/config/i386/x86-64.h
@@ -106,3 +106,22 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 
 #undef TARGET_SECTION_TYPE_FLAGS
 #define TARGET_SECTION_TYPE_FLAGS  x86_64_elf_section_type_flags
+
+/* genode64.h */
+
+/*
+ * The 'LINK_SPEC' macro expresses the policy of how the GCC
+ * frontend invokes 'ld' on multiarch platforms. I.e., on x86, we need to pass
+ * '-melf_i386' to 'ld' when building in '-m32' mode.
+ */
+
+#undef LINK_SPEC
+#define LINK_SPEC \
+  "%{!m32:-m elf_x86_64} \
+   %{m32:-m elf_i386} \
+   %{shared:-shared} \
+   %{!static:--eh-frame-hdr}"
+
+/* Don't assume anything about the header files.  */
+/* https://gcc.gnu.org/bugzilla/show_bug.cgi?id=57699 */
+#define NO_IMPLICIT_EXTERN_C
diff --git a/gcc/config/riscv/riscv.h b/gcc/config/riscv/riscv.h
index 4533cff..1f78497 100644
--- a/gcc/config/riscv/riscv.h
+++ b/gcc/config/riscv/riscv.h
@@ -171,14 +171,11 @@ along with GCC; see the file COPYING3.  If not see
 %(subtarget_asm_spec)"
 
 /* Extra switches sometimes passed to the linker.  */
-
-#ifndef LINK_SPEC
+#undef LINK_SPEC
 #define LINK_SPEC "\
-%{!T:-dT riscv.ld} \
-%{m64:-melf64lriscv} \
-%{m32:-melf32lriscv} \
-%{shared}"
-#endif  /* LINK_SPEC defined */
+-melf64lriscv \
+%{shared:-shared} \
+%{!static:--eh-frame-hdr}"
 
 /* This macro defines names of additional specifications to put in the specs
    that can be used in various specifications like CC1_SPEC.  Its definition
diff --git a/libgcc/config.host b/libgcc/config.host
index 8a30368..83b5dba 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -300,7 +300,7 @@ case ${host} in
   tmake_file=t-vxworks
   ;;
 *-*-elf)
-  extra_parts="crtbegin.o crtend.o"
+  extra_parts="crtbegin.o crtbeginS.o crtbeginT.o crtend.o crtendS.o"
   ;;
 esac
 
@@ -387,8 +387,12 @@ arm*-*-eabi* | arm*-*-symbianelf* | arm*-*-rtems*)
 	tm_file="$tm_file arm/bpabi-lib.h"
 	case ${host} in
 	arm*-*-eabi* | arm*-*-rtems*)
+	  # The 't-slibgcc' tmake file is needed to have libgcc_eh.a built.
+	  # The 't-eh-dw2-dip' tmake file is needed to let the tool chain use 'unwind-dw2-fde-dip.c',
+	  # needed for the exception handling on Genode in the presence of shared libraries.
+	  tmake_file="${tmake_file} t-crtstuff-pic t-libgcc-pic t-eh-dw2-dip t-slibgcc t-slibgcc-gld t-slibgcc-elf-ver"
 	  tmake_file="${tmake_file} arm/t-bpabi"
-	  extra_parts="crtbegin.o crtend.o crti.o crtn.o"
+	  extra_parts="crtbegin.o crtbeginS.o crtbeginT.o crtend.o crtendS.o"
 	  ;;
 	arm*-*-symbianelf*)
 	  tmake_file="${tmake_file} arm/t-symbian t-slibgcc-nolc-override"
@@ -546,6 +550,10 @@ i[34567]86-*-elf*)
 	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
 	;;
 x86_64-*-elf*)
+	# The 't-slibgcc' tmake file is needed to have libgcc_eh.a built.
+	# The 't-eh-dw2-dip' tmake file is needed to let the tool chain use 'unwind-dw2-fde-dip.c',
+	# needed for the exception handling on Genode in the presence of shared libraries.
+	tmake_file="$tmake_file t-eh-dw2-dip t-slibgcc t-slibgcc-gld t-slibgcc-elf-ver"
 	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
 	;;
 i[34567]86-*-freebsd*)
@@ -1014,8 +1022,8 @@ riscv*-*-linux*)
 	extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o crtendS.o crtbeginT.o"
 	;;
 riscv*-*-*)
-	tmake_file="${tmake_file} riscv/t-fpbit riscv/t-dpbit riscv/t-elf"
-	extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o"
+	tmake_file="${tmake_file} riscv/t-fpbit riscv/t-dpbit riscv/t-elf t-crtstuff-pic t-libgcc-pic t-eh-dw2-dip t-slibgcc t-slibgcc-gld t-slibgcc-elf-ver"
+	extra_parts="crtbegin.o crtbeginS.o crtbeginT.o crtend.o crtendS.o"
 	;;
 rs6000-ibm-aix4.[3456789]* | powerpc-ibm-aix4.[3456789]*)
 	md_unwind_header=rs6000/aix-unwind.h