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Makefile: Explain process of handling CONFIG_* variables

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Corresponding to flashrom svn r1721.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
This commit is contained in:
Stefan Tauner 2013-08-25 00:10:56 +00:00
parent 4dd0f906c6
commit 037cd84889
1 changed files with 13 additions and 2 deletions
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15
Makefile
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@ -61,10 +61,13 @@ CFLAGS += -Werror
endif
###############################################################################
# General OS/architecture specific settings.
# General OS-specific settings.
# 1. Prepare for later by gathering information about host and target OS
# 2. Set compiler flags and parameters according to OSes
# 3. Likewise verify user-supplied CONFIG_* variables.
# HOST_OS is only used to work around local toolchain issues.
HOST_OS ?= $(shell uname)
HOST_OS ?= $(shell uname)
ifeq ($(HOST_OS), MINGW32_NT-5.1)
# Explicitly set CC = gcc on MinGW, otherwise: "cc: command not found".
CC = gcc
@ -263,6 +266,10 @@ override CONFIG_LINUX_SPI = no
endif
endif
###############################################################################
# General architecture-specific settings.
# Like above for the OS, below we verify user-supplied options depending on the target architecture.
# Determine the destination processor architecture.
# IMPORTANT: The following line must be placed before ARCH is ever used
# (of course), but should come after any lines setting CC because the line
@ -334,6 +341,9 @@ RELEASENAME ?= $(VERSION)
SVNDEF := -D'FLASHROM_VERSION="$(VERSION)"'
###############################################################################
# Default settings of CONFIG_* variables.
# Always enable internal/onboard support for now.
CONFIG_INTERNAL ?= yes
@ -426,6 +436,7 @@ endif
###############################################################################
# Programmer drivers and programmer support infrastructure.
# Depending on the CONFIG_* variables set and verified above we set compiler flags and parameters below.
FEATURE_CFLAGS += -D'CONFIG_DEFAULT_PROGRAMMER=$(CONFIG_DEFAULT_PROGRAMMER)'