diff options
Diffstat (limited to 'Config.in')
| -rw-r--r-- | Config.in | 66 |
1 files changed, 33 insertions, 33 deletions
@@ -207,9 +207,9 @@ choice 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 + 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. @@ -221,7 +221,7 @@ config BR2_DEBUG_2 config BR2_DEBUG_3 bool "debug level 3" help - Level 3 includes extra information, such as all the + 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 @@ -266,41 +266,41 @@ config BR2_OPTIMIZE_0 bool "optimization level 0" depends on !BR2_PACKAGE_LINUX help - Do not optimize. This is the default. + Do not optimize. This is the default. config BR2_OPTIMIZE_1 bool "optimization level 1" depends on !BR2_PACKAGE_LINUX 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 + 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 + -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 + 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. @@ -308,20 +308,20 @@ config BR2_OPTIMIZE_2 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 + 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 + 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 + 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 |