Commit 1c7bafe7 authored by Robert P. J. Day's avatar Robert P. J. Day Committed by Sam Ravnborg

kbuild: clarify "make C=" build option

Clarify the use of "make C=" in the top-level Makefile, and fix a
typo in the Documentation file.
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent e4121712
......@@ -69,10 +69,10 @@ recompiled, or use "make C=2" to run sparse on the files whether they need to
be recompiled or not. The latter is a fast way to check the whole tree if you
have already built it.
The optional make variable CF can be used to pass arguments to sparse. The
build system passes -Wbitwise to sparse automatically. To perform endianness
checks, you may define __CHECK_ENDIAN__:
The optional make variable CHECKFLAGS can be used to pass arguments to sparse.
The build system passes -Wbitwise to sparse automatically. To perform
endianness checks, you may define __CHECK_ENDIAN__:
make C=2 CF="-D__CHECK_ENDIAN__"
make C=2 CHECKFLAGS="-D__CHECK_ENDIAN__"
These checks are disabled by default as they generate a host of warnings.
......@@ -41,9 +41,15 @@ ifndef KBUILD_VERBOSE
KBUILD_VERBOSE = 0
endif
# Call checker as part of compilation of C files
# Use 'make C=1' to enable checking (sparse, by default)
# Override with 'make C=1 CHECK=checker_executable CHECKFLAGS=....'
# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
# See the file "Documentation/sparse.txt" for more details, including
# where to get the "sparse" utility.
ifdef C
ifeq ("$(origin C)", "command line")
......
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