The first patch is just something I suggested to allow zstd support to move forward. The remaining ones aim to make it more ergonomic to use CONFIG_IS_ENABLED to exclude things from the build.
While it currently works just fine in C code that one can do
if (CONFIG_IS_ENABLED(FOO)) {
}
and have the compiler throw the whole block away, and then later the linker throw away any functions and/or data that turns out not be used anyway, it's currently somewhat uglier to exclude items from an array initializer - it requires three lines to do
#if CONFIG_IS_ENABLED(FOO) { some array item }, #endif
and grepping for the FOO symbol doesn't really show what it is used for including/excluding.
With the last patch, one can instead do
CONFIG_IS_ENABLED(FOO, ({ some array item },))
It's just an RFC; I think this can be useful to reduce the size of SPL/TPL without too much cluttering of the source, others can disagree.
Rasmus Villemoes (4): common/image.c: image_decomp: put IH_COMP_XXX cases inside ifndef USE_HOSTCC linux/kconfig.h: simplify logic for choosing CONFIG_{SPL_,TPL_,}* linux/kconfig.h: remove unused helper macros linux/kconfig.h: create two- and three-argument versions of CONFIG_IS_ENABLED
common/image.c | 2 + include/linux/kconfig.h | 103 ++++++++++++++++++----------------- scripts/config_whitelist.txt | 2 - 3 files changed, 54 insertions(+), 53 deletions(-)