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<!DOCTYPE html>
<html><head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Kconfig</title>
<meta name="generator" content="KF5::SyntaxHighlighting - Definition (Kconfig) - Theme (Breeze Dark)"/>
</head><body style="background-color:#232629;color:#cfcfc2"><pre>
<span style="color:#2980b9">This</span> <span style="color:#da4453;text-decoration:underline">is wrong but should not crash ] ) } !</span>
<span style="color:#7a7c7d"># comment</span>
<span style="font-weight:bold">config</span> BR2_PACKAGE_GAMMARAY
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"gammaray"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> BR2_PACKAGE_QT5
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> GammaRay Qt introspection probe.</span>
<span style="color:#da4453"> second line of help, with correct indentation</span>
<span style="color:#da4453"> GammaRay Qt introspection probe.</span>
<span style="color:#da4453"> second line of help, with correct indentation</span>
<span style="color:#da4453"> </span><span style="color:#da4453;text-decoration:underline">third line underindented and thus wrong</span>
<span style="color:#27ae60">default</span> <span style="color:#f44f4f">'true'</span>
<span style="font-weight:bold">config</span> W1_MASTER_GPIO_CUSTOM
<span style="color:#2980b9">tristate</span> <span style="color:#f44f4f">"Custom GPIO-based W1 driver"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> GENERIC_GPIO
<span style="color:#27ae60">select</span> W1_GPIOconfig <span style="color:#da4453;text-decoration:underline">AG71XX</span>
<span style="color:#2980b9">tristate</span> <span style="color:#f44f4f">"Atheros AR7XXX/AR9XXX built-in ethernet mac support"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> ATH79
<span style="color:#27ae60">imply</span> HAS_TXX9_SERIAL
<span style="color:#27ae60">def_</span><span style="color:#2980b9">bool</span> LD_VERSION <span style="color:#3f8058">>=</span> 225000000 <span style="color:#3f8058">||</span> LD_IS_LLD
<span style="color:#27ae60">select</span> PHYLIB
<span style="color:#27ae60;text-decoration:line-through">---help---</span>
<span style="color:#da4453"> If you wish to compile a kernel for AR7XXX/91XXX and enable</span>
<span style="color:#da4453"> ethernet support, then you should always answer Y to this.</span>
<span style="font-weight:bold">comment</span> <span style="color:#f44f4f">"module support disabled"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> <span style="color:#3f8058">!</span>MODULES
<span style="font-weight:bold">menu</span> <span style="text-decoration:line-through">myMenu</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> NET
<span style="font-weight:bold">config</span> NETDEVICES
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"Atheros AR71xx built-in ethernet driver debugging"</span>
<span style="color:#27ae60">def_</span><span style="color:#2980b9">bool</span> ds
<span style="color:#27ae60">default</span> <span style="color:#27aeae;font-weight:bold">n</span>
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> Atheros AR71xx built-in ethernet driver debugging messages.</span>
<span style="font-weight:bold">endmenu</span>
<span style="font-weight:bold">if</span> TARGET_OX820
<span style="font-weight:bold">config</span> SYS_CPU
<span style="color:#27ae60">default</span> <span style="color:#f44f4f">"arm1136"</span>
<span style="font-weight:bold">endif</span>
<span style="font-weight:bold">if</span> AG71XX
<span style="font-weight:bold">config</span> AG71XX_DEBUG
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"Atheros AR71xx built-in ethernet driver debugging"</span>
<span style="color:#27ae60">default</span> <span style="color:#27aeae;font-weight:bold">n</span>
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> Atheros AR71xx built-in ethernet driver debugging messages.</span>
<span style="font-weight:bold">endif</span>
<span style="color:#7a7c7d"># comment</span>
<span style="font-weight:bold">menu</span> <span style="color:#f44f4f">"System setup"</span>
<span style="font-weight:bold">choice</span>
<span style="color:#27ae60">prompt</span> <span style="color:#f44f4f">"Alpha system type"</span>
<span style="color:#27ae60">default</span> ALPHA_GENERIC
<span style="color:#95da4c;background-color:#4d1f24;font-weight:bold;text-decoration:line-through">string</span> <span style="color:#f44f4f">"bad"</span>
<span style="color:#27ae60;text-decoration:line-through">---help---</span>
<span style="color:#da4453"> This is the system type of your hardware.</span>
<span style="color:#da4453"> </span><span style="font-weight:bold">config</span> HZ_32
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"32 Hz"</span>
<span style="font-weight:bold">config</span> HZ_64
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"64 Hz"</span>
<span style="font-weight:bold">config</span> ALPHA_GENERIC
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"Generic"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> TTY
<span style="color:#27ae60">select</span> HAVE_EISA
<span style="color:#27ae60">select</span> GENERIC_BUG_RELATIVE_POINTERS <span style="font-weight:bold">if</span> X86_64
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"64-bit kernel"</span> <span style="font-weight:bold">if</span> <span style="color:#f44f4f">"</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">SUBARCH</span><span style="color:#3daee9">)</span><span style="color:#f44f4f">"</span> <span style="color:#3f8058">=</span> <span style="color:#f44f4f">"x86"</span>
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"Support the legacy </span><span style="color:#3daee9">\"</span><span style="color:#f44f4f">mmu-masters</span><span style="color:#3daee9">\"</span><span style="color:#f44f4f"> devicetree bindings"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> ARM_SMMU<span style="color:#3f8058">=</span><span style="color:#27aeae;font-weight:bold">y</span> <span style="color:#3f8058">&amp;&amp;</span> OF
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> A generic kernel will run on all supported Alpha hardware.</span>
<span style="font-weight:bold">endchoice</span>
<span style="font-weight:bold">config</span> VGA_HOSE
<span style="color:#2980b9">bool</span>
<span style="color:#27ae60">def_</span><span style="color:#2980b9">bool</span> <span style="color:#27aeae;font-weight:bold">y</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> VGA_CONSOLE <span style="color:#3f8058">&amp;&amp;</span> <span style="color:#3f8058">(</span>ALPHA_GENERIC <span style="color:#3f8058">||</span> ALPHA_TITAN <span style="color:#3f8058">||</span> ALPHA_MARVEL <span style="color:#3f8058">||</span> ALPHA_TSUNAMI<span style="color:#3f8058">)</span>
<span style="color:#27ae60">default</span> <span style="color:#27aeae;font-weight:bold">y</span>
<span style="color:#27ae60">default</span> <span style="color:#27aeae;font-weight:bold">n</span>
<span style="color:#27ae60">default</span> 3
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"Use WTINT"</span> <span style="font-weight:bold">if</span> ALPHA_SRM <span style="color:#3f8058">||</span> ALPHA_GENERIC
<span style="color:#27ae60">default</span> <span style="color:#27aeae;font-weight:bold">y</span> <span style="font-weight:bold">if</span> ALPHA_QEMU
<span style="color:#27ae60">default</span> <span style="color:#27aeae;font-weight:bold">n</span> <span style="font-weight:bold">if</span> ALPHA_EV5 <span style="color:#3f8058">||</span> ALPHA_EV56 <span style="color:#3f8058">||</span> <span style="color:#3f8058">(</span>ALPHA_EV4 <span style="color:#3f8058">&amp;&amp;</span> <span style="color:#3f8058">!</span>ALPHA_LCA<span style="color:#3f8058">)</span>
<span style="color:#27ae60">default</span> <span style="color:#27aeae;font-weight:bold">n</span> <span style="font-weight:bold">if</span> <span style="color:#3f8058">!</span>ALPHA_SRM <span style="color:#3f8058">&amp;&amp;</span> <span style="color:#3f8058">!</span>ALPHA_GENERIC
<span style="color:#27ae60">default</span> <span style="color:#27aeae;font-weight:bold">y</span> <span style="font-weight:bold">if</span> SMP
<span style="color:#27ae60">default</span> <span style="color:#f44f4f">"y"</span> <span style="font-weight:bold">if</span> PPC_POWERNV
<span style="color:#27ae60">range</span> 2 32
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> SMP
<span style="color:#27ae60">default</span> <span style="color:#f44f4f">"32"</span> <span style="font-weight:bold">if</span> ALPHA_GENERIC <span style="color:#3f8058">||</span> ALPHA_MARVEL
<span style="color:#27ae60">default</span> <span style="color:#f44f4f">'4'</span> <span style="font-weight:bold">if</span> <span style="color:#3f8058">!</span>ALPHA_GENERIC <span style="color:#3f8058">&amp;&amp;</span> <span style="color:#3f8058">!</span>ALPHA_MARVEL
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> Support VGA on an arbitrary hose; needed for several platforms</span>
<span style="color:#da4453"> which always have multiple hoses, and whose consoles support it.</span>
<span style="font-weight:bold">endmenu</span>
<span style="font-weight:bold">menu</span> <span style="color:#f44f4f">"ARC Architecture Configuration"</span>
<span style="font-weight:bold">menu</span> <span style="color:#f44f4f">"ARC Platform/SoC/Board"</span>
<span style="color:#7a7c7d">#New platform adds here</span>
<span style="color:#27ae60">source</span> <span style="color:#f44f4f">"arch/arc/plat-eznps/Kconfig"</span>
<span style="color:#27ae60">source</span> <span style="color:#f44f4f">'arch/arc/plat-hsdk/Kconfig'</span>
<span style="font-weight:bold">endmenu</span>
<span style="font-weight:bold">menu</span> <span style="color:#f44f4f">"ARC CPU Configuration"</span>
<span style="font-weight:bold">choice</span>
<span style="color:#27ae60">prompt</span> <span style="color:#f44f4f">"ARC Core"</span>
<span style="color:#27ae60">default</span> ARC_CPU_HS <span style="font-weight:bold">if</span> ISA_ARCV2
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> bla bla</span>
<span style="font-weight:bold">if</span> ISA_ARCOMPACT
<span style="font-weight:bold">config</span> ARC_CPU_750D
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"ARC750D"</span>
<span style="color:#27ae60">select</span> ARC_CANT_LLSC
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> Support for ARC750 core</span>
<span style="font-weight:bold">endif</span> <span style="color:#7a7c7d">#ISA_ARCOMPACT</span>
<span style="font-weight:bold">endchoice</span>
<span style="font-weight:bold">if</span> SMP
<span style="font-weight:bold">config</span> NR_CPUS
<span style="color:#2980b9">int</span> <span style="color:#f44f4f">"Maximum number of CPUs (2-4096)"</span>
<span style="color:#27ae60">range</span> 2 4096
<span style="color:#27ae60">default</span> <span style="color:#f44f4f">"4"</span>
<span style="font-weight:bold">endif</span> <span style="color:#7a7c7d">#SMP</span>
<span style="font-weight:bold">config</span> ARC_MMU_V4
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"MMU v4"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> ISA_ARCV2
<span style="font-weight:bold">endmenu</span> <span style="color:#7a7c7d"># "ARC CPU Configuration"</span>
<span style="font-weight:bold">menuconfig</span> ARC_PLAT_EZNPS
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"</span><span style="color:#3daee9">\"</span><span style="color:#f44f4f">EZchip</span><span style="color:#3daee9">\"</span><span style="color:#f44f4f"> ARC dev platform"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> ISA_ARCOMPACT
<span style="color:#27ae60">select</span> CPU_BIG_ENDIAN
<span style="color:#27ae60">select</span> CLKSRC_NPS <span style="font-weight:bold">if</span> <span style="color:#3f8058">!</span>PHYS_ADDR_T_64BIT
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> Support for EZchip development platforms,</span>
<span style="color:#da4453"> based on ARC700 cores.</span>
<span style="color:#da4453"> We handle few flavors:</span>
<span style="color:#da4453"> - Hardware Emulator AKA HE which is FPGA based chassis</span>
<span style="color:#da4453"> - Simulator based on MetaWare nSIM</span>
<span style="color:#da4453"> - NPS400 chip based on ASIC</span>
<span style="color:#7a7c7d"># </span><span style="color:#3f8058;font-style:italic">SPDX-License-Identifier:</span><span style="color:#3f8058;font-style:italic"> </span><span style="color:#3f8058;font-style:italic">GPL-2.0-only</span>
<span style="font-weight:bold">config</span> ARM64
<span style="color:#27ae60">def_</span><span style="color:#2980b9">bool</span> <span style="color:#27aeae;font-weight:bold">y</span>
<span style="color:#27ae60">select</span> HAVE_DYNAMIC_FTRACE_WITH_REGS \
<span style="font-weight:bold">if</span> <span style="color:#3daee9">$(</span><span style="color:#2980b9">cc-option</span><span style="font-weight:bold">,</span><span style="color:#2980b9">-fpatchable-function-entry=2</span><span style="color:#3daee9">)</span>
<span style="color:#27ae60">select</span> HAVE_EFFICIENT_UNALIGNED_ACCESS
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> ARM 64-bit (AArch64) Linux support.</span>
<span style="font-weight:bold">config</span> PHYS_OFFSET
<span style="color:#2980b9">hex</span> <span style="color:#f44f4f">"Physical address of main memory"</span> <span style="font-weight:bold">if</span> MMU
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> <span style="color:#3f8058">!</span>ARM_PATCH_PHYS_VIRT
<span style="color:#27ae60">default</span> DRAM_BASE <span style="font-weight:bold">if</span> <span style="color:#3f8058">!</span>MMU
<span style="color:#27ae60">default</span> 0x00000000 <span style="font-weight:bold">if</span> ARCH_EBSA110 <span style="color:#3f8058">||</span> \
ARCH_FOOTBRIDGE <span style="color:#3f8058">||</span> \
ARCH_INTEGRATOR <span style="color:#3f8058">||</span> \
ARCH_REALVIEW
<span style="color:#27ae60">default</span> 0x10000000 <span style="font-weight:bold">if</span> ARCH_OMAP1 <span style="color:#3f8058">||</span> ARCH_RPC
<span style="color:#27ae60">default</span> 0x20000000 <span style="font-weight:bold">if</span> ARCH_S5PV210
<span style="color:#27ae60">default</span> 0xc0000000 <span style="font-weight:bold">if</span> ARCH_SA1100
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> Please provide the physical address corresponding to the</span>
<span style="color:#da4453"> location of main memory in your system.</span>
<span style="font-weight:bold">comment</span> <span style="color:#f44f4f">"S3C2416 Boards"</span>
<span style="font-weight:bold">config</span> KERNEL_RAM_BASE_ADDRESS
<span style="color:#2980b9">hex</span> <span style="color:#f44f4f">"Virtual address of memory base"</span>
<span style="color:#27ae60">default</span> 0xe0000000 <span style="font-weight:bold">if</span> SOC_TMS320C6455
<span style="color:#27ae60">default</span> 0xe0000000 <span style="font-weight:bold">if</span> SOC_TMS320C6457
<span style="font-weight:bold">config</span> CC_IS_GCC
<span style="color:#27ae60">def_</span><span style="color:#2980b9">bool</span> <span style="color:#3daee9">$(</span><span style="color:#2980b9">success</span><span style="font-weight:bold">,</span><span style="color:#2980b9">echo "</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">CC_VERSION_TEXT</span><span style="color:#3daee9">)</span><span style="color:#2980b9">" | grep -q gcc</span><span style="color:#3daee9">)</span>
<span style="color:#da4453;text-decoration:underline">endif # error</span>
<span style="color:#7a7c7d"># next line caused hang, see https://phabricator.kde.org/D18509</span>
<span style="font-weight:bold">menu</span>
<span style="color:#7a7c7d"># the next lines should all be fine</span>
<span style="color:#2980b9">plain</span><span style="color:#3daee9">:=</span><span style="color:#f44f4f">plain_value</span>
<span style="color:#2980b9">with_whitespace</span> <span style="color:#3daee9">:=</span> <span style="color:#f44f4f">plain value whitespace</span>
<span style="color:#2980b9">value_with_expansion</span> <span style="color:#3daee9">:=</span> <span style="color:#3daee9">$(</span><span style="color:#2980b9">ARCH</span><span style="color:#3daee9">)</span>
<span style="color:#2980b9">plain_expansion_mix</span> <span style="color:#3daee9">:=</span> <span style="color:#f44f4f">Linux/</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">ARCH</span><span style="color:#3daee9">)</span><span style="color:#f44f4f"> </span><span style="color:#3daee9">$(</span><span style="color:#2980b9">KERNELVERSION</span><span style="color:#3daee9">)</span><span style="color:#f44f4f"> Kernel Configuration</span>
<span style="color:#7a7c7d"># function definition</span>
<span style="color:#2980b9">cc-option-bit</span> <span style="color:#3daee9">=</span> <span style="color:#3daee9">$(</span><span style="color:#2980b9">if-success</span><span style="font-weight:bold">,</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">CC</span><span style="color:#3daee9">)</span><span style="color:#2980b9"> -Werror </span><span style="color:#3daee9">$(</span><span style="color:#2980b9">1</span><span style="color:#3daee9">)</span><span style="color:#2980b9"> -E -x c /dev/null -o /dev/null</span><span style="font-weight:bold">,</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">1</span><span style="color:#3daee9">))</span>
<span style="color:#7a7c7d"># function call</span>
<span style="color:#3daee9">$(</span><span style="color:#2980b9">cc-option-bit</span><span style="font-weight:bold">,</span><span style="color:#2980b9">-m64</span><span style="color:#3daee9">)</span>
<span style="color:#7a7c7d"># function call and storing the result</span>
<span style="color:#2980b9">m32-flag</span> <span style="color:#3daee9">:=</span> <span style="color:#3daee9">$(</span><span style="color:#2980b9">cc-option-bit</span><span style="font-weight:bold">,</span><span style="color:#2980b9">-m32</span><span style="color:#3daee9">)</span>
<span style="color:#7a7c7d"># call to known function</span>
<span style="color:#2980b9">name</span> <span style="color:#3daee9">:=</span> <span style="color:#3daee9">$(</span><span style="color:#7f8c8d">filename</span><span style="color:#3daee9">)</span>
<span style="color:#7a7c7d"># call to known function with arguments</span>
<span style="color:#3daee9">$(</span><span style="color:#7f8c8d">warning-if</span><span style="font-weight:bold">,</span><span style="color:#2980b9">y</span><span style="font-weight:bold">,</span><span style="color:#2980b9">hello world 1</span><span style="color:#3daee9">)</span>
<span style="color:#7a7c7d"># ... with nested expansions</span>
<span style="color:#3daee9">$(</span><span style="color:#7f8c8d">error-if</span><span style="font-weight:bold">,</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">success</span><span style="font-weight:bold">,</span><span style="color:#2980b9"> </span><span style="color:#3daee9">$(</span><span style="color:#2980b9">LD</span><span style="color:#3daee9">)</span><span style="color:#2980b9"> -v | grep -q gold</span><span style="color:#3daee9">)</span><span style="font-weight:bold">,</span><span style="color:#2980b9"> gold linker '</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">LD</span><span style="color:#3daee9">)</span><span style="color:#2980b9">' not supported</span><span style="color:#3daee9">)</span>
<span style="color:#7a7c7d"># expansion in different contexts</span>
<span style="font-weight:bold">config</span> FOO_<span style="color:#3daee9">$(</span><span style="color:#2980b9">BAR</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">BAZ</span><span style="color:#3daee9">))</span>
<span style="color:#2980b9">int</span> <span style="color:#f44f4f">"</span><span style="color:#3daee9">$(</span><span style="color:#7f8c8d">filename</span><span style="color:#3daee9">)</span><span style="color:#f44f4f">"</span>
<span style="color:#27ae60">default</span> <span style="color:#3daee9">$(</span><span style="color:#7f8c8d">lineno</span><span style="color:#3daee9">)</span> <span style="font-weight:bold">if</span> <span style="color:#3daee9">$(</span><span style="color:#7f8c8d">lineno</span><span style="color:#3daee9">)</span> <span style="color:#3f8058">>=</span> 5
<span style="font-weight:bold">menu</span> <span style="color:#f44f4f">"A MENU"</span>
<span style="color:#27ae60">visible</span> <span style="color:#27ae60">if</span> 01 <span style="color:#3f8058">></span> 00
<span style="font-weight:bold">config</span> A_BOOL
<span style="color:#27ae60">def_</span><span style="color:#2980b9">bool</span> <span style="color:#27aeae;font-weight:bold">y</span> <span style="color:#3f8058">&amp;&amp;</span> <span style="color:#27aeae;font-weight:bold">m</span> <span style="color:#3f8058">||</span> !!<span style="color:#3f8058">(</span>!<span style="color:#3f8058">(</span>!!<span style="color:#27aeae;font-weight:bold">n</span><span style="color:#3f8058">))</span> <span style="color:#3f8058">||</span> <span style="color:#f44f4f">"</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">foo</span><span style="color:#3daee9">)</span><span style="color:#f44f4f">"</span>
<span style="font-weight:bold">endmenu</span>
<span style="color:#7a7c7d"># Advanced real world example taken from init/Kconfig in Linux 5.10:</span>
<span style="color:#7a7c7d"># Invoke the system shell /bin/sh with a command to pipe a C program with an</span>
<span style="color:#7a7c7d"># asm goto statement to the C compiler that is set by the environment. If the</span>
<span style="color:#7a7c7d"># exit code is 0 then set the default value of CC_HAS_ASM_GOTO_OUTPUT to y,</span>
<span style="color:#7a7c7d"># otherwise to n.</span>
<span style="font-weight:bold">config</span> CC_HAS_ASM_GOTO_OUTPUT
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> CC_HAS_ASM_GOTO
<span style="color:#27ae60">def_</span><span style="color:#2980b9">bool</span> <span style="color:#3daee9">$(</span><span style="color:#2980b9">success</span><span style="font-weight:bold">,</span><span style="color:#2980b9">echo 'int foo(int x) { asm goto ("": "=r"(x) ::: bar); return x; bar: return 0; }' | </span><span style="color:#3daee9">$(</span><span style="color:#2980b9">CC</span><span style="color:#3daee9">)</span><span style="color:#2980b9"> -x c - -c -o /dev/null</span><span style="color:#3daee9">)</span>
<span style="color:#7a7c7d"># Real world example with irregular indentation</span>
<span style="font-weight:bold">config</span> W1_MASTER_DS2490
<span style="color:#2980b9">tristate</span> <span style="color:#f44f4f">"DS2490 USB &lt;-> W1 transport layer for 1-wire"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> USB
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> Say Y here if you want to have a driver for DS2490 based USB &lt;-> W1 bridges,</span>
<span style="color:#da4453"> for example DS9490*.</span>
<span style="color:#da4453"> This support is also available as a module. If so, the module</span>
<span style="color:#da4453"> will be called ds2490.</span>
<span style="color:#7a7c7d"># synthetic example</span>
<span style="color:#2980b9">to_upper</span><span style="color:#3daee9">=</span><span style="color:#3daee9">$(</span><span style="color:#7f8c8d">shell</span><span style="font-weight:bold">,</span><span style="color:#2980b9">echo </span><span style="color:#3daee9">$(</span><span style="color:#2980b9">1</span><span style="color:#3daee9">)</span><span style="color:#2980b9"> | tr [:lower:] [:upper:]</span><span style="color:#3daee9">)</span>
<span style="font-weight:bold">config</span> ARGS_<span style="color:#3daee9">$(</span><span style="color:#2980b9">to_upper</span><span style="font-weight:bold">,</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">CC</span><span style="color:#3daee9">))</span>
<span style="color:#2980b9">string</span> <span style="color:#f44f4f">"Arguments for the current compiler </span><span style="color:#3daee9">\"</span><span style="color:#3daee9">$(</span><span style="color:#2980b9">CC</span><span style="color:#3daee9">)</span><span style="color:#3daee9">\"</span><span style="color:#f44f4f">"</span>
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> This is a bad idea.</span>
<span style="color:#da4453"> See &lt;</span><span style="color:#27ae60">file:Documentation/completely/made-up.rst</span><span style="color:#da4453">></span>
<span style="color:#7a7c7d"># binary operator in expression of an if statement</span>
<span style="font-weight:bold">if</span> CPU_SUPPORTS_CPUFREQ <span style="color:#3f8058">&amp;&amp;</span> MIPS_EXTERNAL_TIMER
<span style="color:#27ae60">source</span> <span style="color:#f44f4f">"drivers/cpufreq/Kconfig"</span>
<span style="font-weight:bold">endif</span>
<span style="color:#7a7c7d"># alert on characters (here a colon) that are ignored (taken from axTLS 2.1.5)</span>
<span style="font-weight:bold">config</span> CONFIG_LUA_CORE
<span style="color:#2980b9">string</span> <span style="color:#f44f4f">"Location of Lua CORE"</span>
<span style="color:#27ae60">default</span> <span style="color:#f44f4f">"/usr/local"</span>
<span style="color:#27ae60">help</span><span style="color:#95da4c;background-color:#4d1f24;font-weight:bold">:</span>
<span style="color:#da4453"> If the Lua exists on another directory then this needs to be changed</span>
<span style="font-weight:bold">comment</span> <span style="color:#f44f4f">"Comment texts know expansions, too: </span><span style="color:#3daee9">$(</span><span style="color:#2980b9">CC</span><span style="color:#3daee9">)</span><span style="color:#f44f4f">, and the depends property:"</span>
<span style="color:#27ae60">depends</span> <span style="color:#27ae60">on</span> A_BOOL
<span style="color:#7a7c7d"># "boolean" is now a free variable name ...</span>
<span style="color:#2980b9;text-decoration:line-through">boolean</span><span style="color:#3daee9">=</span><span style="color:#f44f4f">foo</span>
<span style="color:#7a7c7d"># ... but it looks like a bad idea. This may be disputed.</span>
<span style="font-weight:bold">menuconfig</span> MODULES
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"Enable loadable module support"</span>
<span style="color:#27ae60">modules</span>
<span style="color:#7a7c7d"># the three modern options</span>
<span style="font-weight:bold">config</span> OPTIONS
<span style="font-weight:bold;text-decoration:line-through">option</span> <span style="color:#27ae60;text-decoration:line-through">allnoconfig_y</span>
<span style="font-weight:bold;text-decoration:line-through">option</span> <span style="color:#27ae60">modules</span>
<span style="font-weight:bold;text-decoration:line-through">option</span> <span style="color:#27ae60;text-decoration:line-through">defconfig_list</span>
<span style="color:#7a7c7d"># old option "env" and obsolete custom options</span>
<span style="font-weight:bold">config</span> OPTIONS
<span style="font-weight:bold;text-decoration:line-through">option</span> <span style="color:#27ae60;text-decoration:line-through">env</span><span style="color:#3f8058;text-decoration:line-through">=</span><span style="color:#f44f4f;text-decoration:line-through">ARCH</span>
<span style="font-weight:bold;text-decoration:line-through">option</span> <span style="color:#95da4c;background-color:#4d1f24;font-weight:bold;font-style:italic">custom-without-argument</span>
<span style="font-weight:bold;text-decoration:line-through">option</span> <span style="color:#95da4c;background-color:#4d1f24;font-weight:bold;font-style:italic">custom-with-argument</span><span style="color:#3f8058;text-decoration:line-through">=</span><span style="color:#f44f4f;text-decoration:line-through">ABC</span>
<span style="color:#7a7c7d"># old syntax</span>
<span style="font-weight:bold">menu</span> <span style="text-decoration:line-through">OLD_STYLE_PROMPT</span>
<span style="color:#27ae60">visible</span> <span style="color:#27ae60">if</span> CPU_SUPPORTS_CPUFREQ
<span style="color:#7a7c7d"># busybox 1.31.1</span>
<span style="color:#27ae60">source</span> <span style="color:#f44f4f;text-decoration:line-through">libbb/Config.in</span>
<span style="color:#7a7c7d"># uClibc-ng-1.0.37</span>
<span style="font-weight:bold">config</span> DESIRED_TARGET_ARCH
<span style="color:#2980b9">string</span>
<span style="font-weight:bold;text-decoration:line-through">option</span> <span style="color:#27ae60;text-decoration:line-through">env</span><span style="color:#3f8058;text-decoration:line-through">=</span><span style="color:#f44f4f;text-decoration:line-through">"ARCH"</span>
<span style="font-weight:bold">config</span> OLD_HELP
<span style="color:#2980b9">hex</span>
<span style="color:#27ae60;text-decoration:line-through">---help---</span>
<span style="color:#da4453"> old help property</span>
<span style="color:#da4453"> </span><span style="color:#27ae60">default</span> 0x1CEC0FEE
<span style="font-weight:bold">endmenu</span>
<span style="color:#7a7c7d"># a few errors</span>
<span style="color:#2980b9;text-decoration:line-through">allnoconfig_y</span>
<span style="color:#da4453;text-decoration:underline">bool</span>
<span style="color:#da4453;text-decoration:underline">def_bool</span>
<span style="color:#da4453;text-decoration:underline">def_tristate</span>
<span style="color:#da4453;text-decoration:underline">default</span>
<span style="color:#2980b9;text-decoration:line-through">defconfig_list</span>
<span style="color:#da4453;text-decoration:underline">depends</span>
<span style="color:#da4453;text-decoration:underline">endchoice</span>
<span style="color:#da4453;text-decoration:underline">endif</span>
<span style="color:#da4453;text-decoration:underline">help</span>
<span style="color:#da4453;text-decoration:underline">hex</span>
<span style="color:#da4453;text-decoration:underline">imply</span>
<span style="color:#da4453;text-decoration:underline">int</span>
<span style="color:#da4453;text-decoration:underline">mainmenu</span>
<span style="color:#da4453;text-decoration:underline">modules</span>
<span style="color:#da4453;text-decoration:underline">on</span>
<span style="color:#2980b9;text-decoration:line-through">option</span>
<span style="color:#da4453;text-decoration:underline">optional</span>
<span style="color:#da4453;text-decoration:underline">prompt</span>
<span style="color:#da4453;text-decoration:underline">range</span>
<span style="color:#da4453;text-decoration:underline">select</span>
<span style="color:#da4453;text-decoration:underline">string</span>
<span style="color:#da4453;text-decoration:underline">tristate</span>
<span style="color:#da4453;text-decoration:underline">visible</span>
<span style="font-weight:bold">config</span> OK
<span style="color:#2980b9">bool</span> <span style="color:#f44f4f">"still OK"</span>
<span style="color:#27ae60">help</span>
<span style="color:#da4453"> still OK</span>
<span style="color:#da4453;text-decoration:underline">now=fail</span>
<span style="color:#2980b9">andNow</span><span style="color:#3daee9">=</span><span style="color:#f44f4f">OK</span>
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