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syslinux: Fix build with GCC 10

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Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
This commit is contained in:
Michael Tremer
2020-08-11 09:47:06 +00:00
parent ac2d807d1c
commit 8ba15ff89a
3 changed files with 84 additions and 0 deletions
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2
lfs/syslinux
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@@ -77,6 +77,8 @@ $(TARGET) : $(patsubst %,$(DIR_DL)/%,$(objects))
# Apply patches
cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/syslinux-6.03-sysmacros.patch
cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/syslinux-6.04_replace-builtin-strlen-that-appears-to-get-optimized.patch
cd $(DIR_APP) && patch -Np1 < $(DIR_SRC)/src/patches/syslinux-6.04_pre1-fcommon.patch
# Build
cd $(DIR_APP) && make bios $(MAKETUNING)

54
src/patches/syslinux-6.04_pre1-fcommon.patch Normal file
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@@ -0,0 +1,54 @@
https://bugs.gentoo.org/705730
gcc-10 enabled f-no-common by default. Broke syslinux linking.
--- 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

28
src/patches/syslinux-6.04_replace-builtin-strlen-that-appears-to-get-optimized.patch Normal file
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@@ -0,0 +1,28 @@
diff --git a/dos/string.h b/dos/string.h
index f648de2d..407d0233 100644
--- a/dos/string.h
+++ b/dos/string.h
@@ -5,12 +5,22 @@
#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)
+#define strlen(a) inline_strlen(a)
+
+/* replacement for builtin strlen that appears to get optimized away */
+static inline size_t inline_strlen(const char *str)
+{
+ size_t l;
+ for (l = 0; *str++; l++);
+ return l;
+}
/* This only returns true or false */
static inline int memcmp(const void *__m1, const void *__m2, unsigned int __n)