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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 */
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