diff options
Diffstat (limited to 'Config.in')
| -rw-r--r-- | Config.in | 110 |
1 files changed, 103 insertions, 7 deletions
@@ -184,6 +184,43 @@ config BR2_RECENT help This option show recent versions of packages. +config BR2_ENABLE_DEBUG + bool "build packages with debugging symbols" + default n + help + Build packages with debugging symbols + enabled + +if BR2_ENABLE_DEBUG +choice + prompt "gcc debug level" + default BR2_DEBUG_2 + help + Set the debug level for gcc + +config BR2_DEBUG_1 + bool "debug level 1" + help + Debug level 1 produces minimal information, enough + for making backtraces in parts of the program that + you don't plan to debug. This includes descriptions + of functions and external variables, but no information + about local variables and no line numbers. + +config BR2_DEBUG_2 + bool "debug level 2" + help + The default gcc debug level is 2 + +config BR2_DEBUG_3 + bool "debug level 3" + help + Level 3 includes extra information, such as all the + macro definitions present in the program. Some debuggers + support macro expansion when you use -g3. +endchoice +endif + choice prompt "strip" default BR2_STRIP_strip @@ -196,12 +233,14 @@ choice config BR2_STRIP_strip bool "strip" + depends !BR2_ENABLE_DEBUG help strip is the normal strip command config BR2_STRIP_sstrip bool "sstrip" select BR2_PACKAGE_SSTRIP_HOST + depends !BR2_ENABLE_DEBUG help sstrip is a strip that discards more than the normal strip @@ -211,14 +250,71 @@ config BR2_STRIP_none none do not strip (only for debugging!) endchoice -if BR2_STRIP_none -config BR2_ENABLE_DEBUG - bool "build packages with debugging symbols" - default n +choice + prompt "gcc optimization level" + default BR2_OPTIMIZE_0 help - Build packages with debugging symbols - enabled -endif + Set the optimization level for gcc + +config BR2_OPTIMIZE_0 + bool "optimization level 0" + help + Do not optimize. This is the default. + +config BR2_OPTIMIZE_1 + bool "optimization level 1" + help + Optimize. Optimizing compilation takes somewhat more time, + and a lot more memory for a large function. With -O, the + compiler tries to reduce code size and execution time, + without performing any optimizations that take a great deal + of compilation time. -O turns on the following optimization + flags: -fdefer-pop -fdelayed-branch -fguess-branch-probability + -fcprop-registers -floop-optimize -fif-conversion + -fif-conversion2 -ftree-ccp -ftree-dce -ftree-dominator-opts + -ftree-dse -ftree-ter -ftree-lrs -ftree-sra -ftree-copyrename + -ftree-fre -ftree-ch -funit-at-a-time -fmerge-constants + -O also turns on -fomit-frame-pointer on machines where doing + so does not interfere with debugging. + +config BR2_OPTIMIZE_2 + bool "optimization level 2" + help + Optimize even more. GCC performs nearly all supported optimizations + that do not involve a space-speed tradeoff. The compiler does not + perform loop unrolling or function inlining when you specify -O2. + As compared to -O, this option increases both compilation time and + the performance of the generated code. -O2 turns on all optimization + flags specified by -O. It also turns on the following optimization + flags: -fthread-jumps -fcrossjumping -foptimize-sibling-calls + -fcse-follow-jumps -fcse-skip-blocks -fgcse -fgcse-lm + -fexpensive-optimizations -fstrength-reduce -frerun-cse-after-loop + -frerun-loop-opt -fcaller-saves -fpeephole2 -fschedule-insns + -fschedule-insns2 -fsched-interblock -fsched-spec -fregmove + -fstrict-aliasing -fdelete-null-pointer-checks -freorder-blocks + -freorder-functions -falign-functions -falign-jumps -falign-loops + -falign-labels -ftree-vrp -ftree-pre + Please note the warning under -fgcse about invoking -O2 on programs + that use computed gotos. + +config BR2_OPTIMIZE_3 + bool "optimization level 3" + help + Optimize yet more. -O3 turns on all optimizations specified by -O2 + and also turns on the -finline-functions, -funswitch-loops and + -fgcse-after-reload options. + +config BR2_OPTIMIZE_S + bool "optimize for size" + help + Optimize for size. -Os enables all -O2 optimizations that do not + typically increase code size. It also performs further optimizations + designed to reduce code size. -Os disables the following optimization + flags: -falign-functions -falign-jumps -falign-loops -falign-labels + -freorder-blocks -freorder-blocks-and-partition -fprefetch-loop-arrays + -ftree-vect-loop-version + +endchoice config BR2_PREFER_STATIC_LIB bool "prefer static libraries" |