gnu: syslinux: Fix build.

* gnu/packages/patches/syslinux-gcc10.patch: New file.
* gnu/packages/patches/syslinux-strip-gnu-property.patch: New file.
* gnu/local.mk (DIST_PATCH_DATA): Add them.
* gnu/packages/bootloaders.scm (syslinux)[source]: Use them.
[arguments]: Only strip debug symbols.

2 files changed, 118 insertions, 0 deletions

diff --git a/gnu/packages/patches/syslinux-gcc10.patch b/gnu/packages/patches/syslinux-gcc10.patch
new file mode 100644
index 0000000000..8d3750b36e
--- /dev/null
+++ b/gnu/packages/patches/syslinux-gcc10.patch
@@ -0,0 +1,87 @@
+Taken from Gentoo and adapted to fix the build using GCC 10. See:
+https://bugs.gentoo.org/705730.
+
+--- a/mk/com32.mk
++++ b/mk/com32.mk
+@@ -47,6 +47,7 @@ GCCOPT += $(call gcc_ok,-falign-functions=0,-malign-functions=0)
+ GCCOPT += $(call gcc_ok,-falign-jumps=0,-malign-jumps=0)
+ GCCOPT += $(call gcc_ok,-falign-labels=0,-malign-labels=0)
+ GCCOPT += $(call gcc_ok,-falign-loops=0,-malign-loops=0)
++GCCOPT += $(call gcc_ok,-fcommon)
+ 
+ ifeq ($(FWCLASS),EFI)
+ GCCOPT += -mno-red-zone
+--- a/mk/elf.mk
++++ b/mk/elf.mk
+@@ -42,6 +42,7 @@ GCCOPT += $(call gcc_ok,-falign-functions=0,-malign-functions=0)
+ GCCOPT += $(call gcc_ok,-falign-jumps=0,-malign-jumps=0)
+ GCCOPT += $(call gcc_ok,-falign-labels=0,-malign-labels=0)
+ GCCOPT += $(call gcc_ok,-falign-loops=0,-malign-loops=0)
++GCCOPT += $(call gcc_ok,-fcommon)
+ 
+ com32 = $(topdir)/com32
+ core = $(topdir)/core
+--- a/mk/embedded.mk
++++ b/mk/embedded.mk
+@@ -51,6 +51,7 @@ GCCOPT    += $(call gcc_ok,-falign-jumps=0,-malign-jumps=0)
+ GCCOPT    += $(call gcc_ok,-falign-labels=0,-malign-labels=0)
+ GCCOPT    += $(call gcc_ok,-falign-loops=0,-malign-loops=0)
+ GCCOPT    += $(call gcc_ok,-fvisibility=hidden)
++GCCOPT    += $(call gcc_ok,-fcommon)
+ 
+ LIBGCC    := $(shell $(CC) $(GCCOPT) --print-libgcc)
+ 
+--- a/mk/lib.mk
++++ b/mk/lib.mk
+@@ -28,6 +28,7 @@ GCCOPT += $(call gcc_ok,-falign-functions=0,-malign-functions=0)
+ GCCOPT += $(call gcc_ok,-falign-jumps=0,-malign-jumps=0)
+ GCCOPT += $(call gcc_ok,-falign-labels=0,-malign-labels=0)
+ GCCOPT += $(call gcc_ok,-falign-loops=0,-malign-loops=0)
++GCCOPT += $(call gcc_ok,-fcommon)
+ 
+ INCLUDE	= -I$(SRC)
+ STRIP	= strip --strip-all -R .comment -R .note
+--- a/mk/efi.mk
++++ b/mk/efi.mk
+@@ -7,7 +7,7 @@ core = $(topdir)/core
+ # Set up architecture specifics; for cross compilation, set ARCH as apt
+ # gnuefi sets up architecture specifics in ia32 or x86_64 sub directories
+ # set up the LIBDIR and EFIINC for building for the appropriate architecture
+-GCCOPT := $(call gcc_ok,-fno-stack-protector,)
++GCCOPT := $(call gcc_ok,-fno-stack-protector,) $(call gcc_ok,-fcommon)
+ EFIINC = $(objdir)/include/efi
+ LIBDIR  = $(objdir)/lib
+ 
+diff --git a/dos/string.h b/dos/string.h
+index f648de2..a502132 100644
+--- a/dos/string.h
++++ b/dos/string.h
+@@ -5,12 +5,13 @@
+ #ifndef _STRING_H
+ #define _STRING_H
+ 
++#include <stddef.h>
++
+ /* Standard routines */
+ #define memcpy(a,b,c)	__builtin_memcpy(a,b,c)
+ #define memmove(a,b,c)	__builtin_memmove(a,b,c)
+ #define memset(a,b,c)	__builtin_memset(a,b,c)
+ #define strcpy(a,b)	__builtin_strcpy(a,b)
+-#define strlen(a)	__builtin_strlen(a)
+ 
+ /* This only returns true or false */
+ static inline int memcmp(const void *__m1, const void *__m2, unsigned int __n)
+@@ -21,6 +22,13 @@ static inline int memcmp(const void *__m1, const void *__m2, unsigned int __n)
+     return rv;
+ }
+ 
++static inline size_t strlen(const char *s)
++{
++    size_t len = 0;
++    while (*s++) len++;
++    return len;
++}
++
+ extern char *strchr(const char *s, int c);
+ 
+ #endif /* _STRING_H */
\ No newline at end of file
diff --git a/gnu/packages/patches/syslinux-strip-gnu-property.patch b/gnu/packages/patches/syslinux-strip-gnu-property.patch
new file mode 100644
index 0000000000..c656bbeedd
--- /dev/null
+++ b/gnu/packages/patches/syslinux-strip-gnu-property.patch
@@ -0,0 +1,31 @@
+Taken from: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=906414.
+
+Author: Lukas Schwaighofer <lukas@schwaighofer.name>
+Description: Strip the .note.gnu.property section for the mbr. This section is
+ added since binutils Debian version 2.31.1-2 and causes mbr.bin to grow in
+ size beyond what can fit into the master boot record.
+---
+ mbr/i386/mbr.ld   | 1 +
+ mbr/x86_64/mbr.ld | 1 +
+ 2 files changed, 2 insertions(+)
+
+diff --git a/mbr/i386/mbr.ld b/mbr/i386/mbr.ld
+index d14ba80..5368346 100644
+--- a/mbr/i386/mbr.ld
++++ b/mbr/i386/mbr.ld
+@@ -70,4 +70,5 @@ SECTIONS
+   .debug_typenames 0 : { *(.debug_typenames) }
+   .debug_varnames  0 : { *(.debug_varnames) }
+   /DISCARD/ : { *(.note.GNU-stack) }
++  /DISCARD/ : { *(.note.gnu.property) }
+ }
+diff --git a/mbr/x86_64/mbr.ld b/mbr/x86_64/mbr.ld
+index ae27d49..b8c0d89 100644
+--- a/mbr/x86_64/mbr.ld
++++ b/mbr/x86_64/mbr.ld
+@@ -69,4 +69,5 @@ SECTIONS
+   .debug_typenames 0 : { *(.debug_typenames) }
+   .debug_varnames  0 : { *(.debug_varnames) }
+   /DISCARD/ : { *(.note.GNU-stack) }
++  /DISCARD/ : { *(.note.gnu.property) }
+ }