build: add option KERNEL_DEBUG_INFO_BTF

[openwrt/staging/jow.git] / config / Config-kernel.in

diff --git a/config/Config-kernel.in b/config/Config-kernel.in
index ab827d6a71eb47ed0f6b71354b3372532d3656a5..1a3f6a8bdc2f060e6b531b0e5a4465a60cd85204 100644 (file)
--- a/config/Config-kernel.in
+++ b/config/Config-kernel.in
@@ -373,6 +373,34 @@ config KERNEL_DEBUG_INFO
        help
          This will compile your kernel and modules with debug information.
 
+config KERNEL_DEBUG_INFO_BTF
+
+       bool "Enable additional BTF type information"
+       default n
+       depends on !HOST_OS_MACOS
+       depends on KERNEL_DEBUG_INFO && !KERNEL_DEBUG_INFO_REDUCED
+       select DWARVES
+       help
+         Generate BPF Type Format (BTF) information from DWARF debug info.
+         Turning this on expects presence of pahole tool, which will convert
+         DWARF type info into equivalent deduplicated BTF type info.
+
+         Required to run BPF CO-RE applications.
+
+config KERNEL_DEBUG_INFO_REDUCED
+       bool "Reduce debugging information"
+       default y
+       depends on KERNEL_DEBUG_INFO
+       help
+         If you say Y here gcc is instructed to generate less debugging
+         information for structure types. This means that tools that
+         need full debugging information (like kgdb or systemtap) won't
+         be happy. But if you merely need debugging information to
+         resolve line numbers there is no loss. Advantage is that
+         build directory object sizes shrink dramatically over a full
+         DEBUG_INFO build and compile times are reduced too.
+         Only works with newer gcc versions.
+
 config KERNEL_DEBUG_LL_UART_NONE
        bool
        default n