Add Kbuild toolchain test functions support #29
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This implements 9 Kbuild preprocessor functions for toolchain capability detection, enabling parsing of modern Linux kernel Kconfig files (since version 4.18): - success/failure/if-success: Shell command result testing - cc-option/cc-option-bit: C compiler flag support detection - ld-option: Linker option support detection - as-instr/as-option: Assembler capability detection - rustc-option: Rust compiler option detection This resolves parsing errors when processing kernel Kconfig files that use toolchain detection macros like \$(as-instr,tpause %ecx) and nested function calls like \$(success,test -z "\$(shell,...)").
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This implements 9 Kbuild preprocessor functions for toolchain capability detection, enabling parsing of modern Linux kernel Kconfig files (since version 4.18):
This resolves parsing errors when processing kernel Kconfig files that use toolchain detection macros like
$(as-instr,tpause %ecx)and nested function calls like$(success,test -z "\$(shell,...)").