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authorMasahiro Yamada <masahiroy@kernel.org>2022-12-11 05:46:47 +0300
committerMasahiro Yamada <masahiroy@kernel.org>2022-12-13 16:21:14 +0300
commitfccb3d3eda8d19b893e1fd18e8c70b78784b2a72 (patch)
treec7685ee943ebd45f5ce0b34c720393ab3311fca8 /scripts/Kbuild.include
parente4412739472b743e18860ad8d979a7ceb3071652 (diff)
downloadlinux-fccb3d3eda8d19b893e1fd18e8c70b78784b2a72.tar.xz
kbuild: add test-{ge,gt,le,lt} macros
GNU Make 4.4 introduced $(intcmp ...), which is useful to compare two integers without forking a new process. Add test-{ge,gt,le,lt} macros, which work more efficiently with GNU Make >= 4.4. For older Make versions, they fall back to the 'test' shell command. The first two parameters to $(intcmp ...) must not be empty. To avoid the syntax error, I appended '0' to them. Fortunately, '00' is treated as '0'. This is needed because CONFIG options may expand to an empty string when the kernel configuration is not included. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Acked-by: Palmer Dabbelt <palmer@rivosinc.com> # RISC-V Reviewed-by: Nathan Chancellor <nathan@kernel.org> Reviewed-by: Nicolas Schier <nicolas@fjasle.eu>
Diffstat (limited to 'scripts/Kbuild.include')
-rw-r--r--scripts/Kbuild.include16
1 files changed, 16 insertions, 0 deletions
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index cbe28744637b..3be7c2d75667 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -12,6 +12,22 @@ space_escape := _-_SPACE_-_
pound := \#
###
+# Comparison macros.
+# Usage: $(call test-lt, $(CONFIG_LLD_VERSION), 150000)
+#
+# Use $(intcmp ...) if supported. (Make >= 4.4)
+# Otherwise, fall back to the 'test' shell command.
+ifeq ($(intcmp 1,0,,,y),y)
+test-ge = $(intcmp $(strip $1)0, $(strip $2)0,,y,y)
+test-gt = $(intcmp $(strip $1)0, $(strip $2)0,,,y)
+else
+test-ge = $(shell test $(strip $1)0 -ge $(strip $2)0 && echo y)
+test-gt = $(shell test $(strip $1)0 -gt $(strip $2)0 && echo y)
+endif
+test-le = $(call test-ge, $2, $1)
+test-lt = $(call test-gt, $2, $1)
+
+###
# Name of target with a '.' as filename prefix. foo/bar.o => foo/.bar.o
dot-target = $(dir $@).$(notdir $@)