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

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

Documentation/sparse.txt

+4 −4
Original line number Diff line number Diff line
@@ -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.

Makefile

+9 −3
Original line number Diff line number Diff line
@@ -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")