Currently LDFLAGS is not cleared, so same flags are accumulated in LDFLAGS when the top Makefile is recursively invoked. I found unneeded rebuild for ARCH=arm64 when CONFIG_TRIM_UNUSED_KSYMS is enabled. If include/generated/autoksyms.h is updated, the top Makefile is recursively invoked, then arch/arm64/Makefile adds one more '-maarch64linux'. Due to the command line change, modules are rebuilt needlessly.
Unified · Split
| @@ -435,6 +435,7 @@ KBUILD_CFLAGS_KERNEL := · 434 unmodified lines | |||
| 435 | KBUILD_AFLAGS_MODULE := -DMODULE | 435 | KBUILD_AFLAGS_MODULE := -DMODULE |
| 436 | KBUILD_CFLAGS_MODULE := -DMODULE | 436 | KBUILD_CFLAGS_MODULE := -DMODULE |
| 437 | KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds | 437 | KBUILD_LDFLAGS_MODULE := -T $(srctree)/scripts/module-common.lds |
| 438 | LDFLAGS := | ||
| 438 | GCC_PLUGINS_CFLAGS := | 439 | GCC_PLUGINS_CFLAGS := |
| 439 | 440 | ||
| 440 | export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC | 441 | export ARCH SRCARCH CONFIG_SHELL HOSTCC HOSTCFLAGS CROSS_COMPILE AS LD CC |