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start a linker script helper file

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Start a common header file for common linker script code (such as
workarounds for older linkers) rather than doing this in the build system.

As fallout, we no longer execute the linker every time config.mk is
included by a build file (which can easily be 70+ times), but rather only
execute it once.

This also fixes a bug in the major version checking by creating a macro to
easily compare versions and keep people from making the same common
mistake (forgetting to check major and minor together).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2009-08-23 02:47:59 -04:00 committed by Wolfgang Denk
parent 2ed0869d30
commit 6ac9f47977
3 changed files with 33 additions and 10 deletions
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8
Makefile
View File

@ -267,6 +267,14 @@ endif
PLATFORM_LIBS += $(PLATFORM_LIBGCC)
export PLATFORM_LIBS
# Special flags for CPP when processing the linker script.
# Pass the version down so we can handle backwards compatibility
# on the fly.
LDPPFLAGS += \
-include $(TOPDIR)/include/u-boot/u-boot.lds.h \
$(shell $(LD) --version | \
sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')
ifeq ($(CONFIG_NAND_U_BOOT),y)
NAND_SPL = nand_spl
U_BOOT_NAND = $(obj)u-boot-nand.bin

10
config.mk
View File

@ -171,16 +171,6 @@ ifneq ($(TEXT_BASE),)
LDFLAGS += -Ttext $(TEXT_BASE)
endif
# Special flags for CPP when processing the linker script
# Linker versions prior to 2.16 don't understand the builting
# functions SORT_BY_ALIGNMENT() and SORT_BY_NAME(), so disable these
ifeq ($(shell $(LD) -v | \
sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\) .*/[ \1 -lt 2 ] || [ \2 -lt 16 ] \&\& echo old_ld/p' | \
sh),old_ld)
LDPPFLAGS += -D'SORT_BY_ALIGNMENT(x)=x' -D'SORT_BY_NAME(x)=x'
endif
# Location of a usable BFD library, where we define "usable" as
# "built for ${HOST}, supports ${TARGET}". Sensible values are
# - When cross-compiling: the root of the cross-environment

25
include/u-boot/u-boot.lds.h Normal file
View File

@ -0,0 +1,25 @@
/*
* Linker script helper macros
*
* Copyright (c) 2009 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef __U_BOOT_LDS__
#define __U_BOOT_LDS__
/* See if the linker version is at least the specified version */
#define LD_AT_LEAST(major, minor) \
((major > LD_MAJOR) || (major == LD_MAJOR && minor <= LD_MINOR))
/*
* Linker versions prior to 2.16 don't understand the builtin
* functions SORT_BY_ALIGNMENT() and SORT_BY_NAME(), so disable these
*/
#if !LD_AT_LEAST(2, 16)
# define SORT_BY_ALIGNMENT(x) x
# define SORT_BY_NAME(x) x
#endif
#endif