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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 Original line 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

be recompiled or not.  The latter is a fast way to check the whole tree if you

have already built it.

have already built it.





The optional make variable CF can be used to pass arguments to sparse.  The

The optional make variable CHECKFLAGS can be used to pass arguments to sparse.

build system passes -Wbitwise to sparse automatically.  To perform endianness

The build system passes -Wbitwise to sparse automatically.  To perform

checks, you may define __CHECK_ENDIAN__:

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.
 
These checks are disabled by default as they generate a host of warnings.

Makefile

+9 −3
Original line number Original line Diff line number Diff line
@@ -41,9 +41,15 @@ ifndef KBUILD_VERBOSE 
  KBUILD_VERBOSE = 0

  KBUILD_VERBOSE = 0

endif

endif





# Call checker as part of compilation of C files

# Call a source code checker (by default, "sparse") as part of the

# Use 'make C=1' to enable checking (sparse, by default)

# C compilation.

# Override with 'make C=1 CHECK=checker_executable CHECKFLAGS=....'

#

# 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

ifdef C

  ifeq ("$(origin C)", "command line")

  ifeq ("$(origin C)", "command line")