diff options
Diffstat (limited to 'src/compat/Kbuild.include')
| -rw-r--r-- | src/compat/Kbuild.include | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/compat/Kbuild.include b/src/compat/Kbuild.include index db4b0a6..53a8bde 100644 --- a/src/compat/Kbuild.include +++ b/src/compat/Kbuild.include @@ -53,7 +53,11 @@ endif ifdef CONFIG_HZ ifeq ($(wildcard $(srctree)/include/generated/timeconst.h),) -ccflags-y += $(shell echo 'define gcd(a,b){auto t;while(b){t=b;b=a%b;a=t;};return a;};hz=$(CONFIG_HZ);cd=gcd(hz,1000000);print "-DHZ_TO_USEC_NUM=",1000000/cd," -DHZ_TO_USEC_DEN=",hz/cd;halt;' | bc -q) +HZ_IFDEF := $(shell echo 'define gcd(a,b){auto t;while(b){t=b;b=a%b;a=t;};return a;};hz=$(CONFIG_HZ);cd=gcd(hz,1000000);print "-DHZ_TO_USEC_NUM=",1000000/cd," -DHZ_TO_USEC_DEN=",hz/cd;halt;' | bc -q) +ifeq ($(HZ_IFDEF),) +$(error bc(1) is required for building) +endif +ccflags-y += $(HZ_IFDEF) endif endif |