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49 lines
2.1 KiB
Markdown
49 lines
2.1 KiB
Markdown
The newlib version has been updated to "2.2.0" and supply two version C libraries to user.
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One is "libc.a" which functions have more features base on stand C, another is "libc_nano.c"
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which functions have less function.
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You can choose the one you needed by menuconfig:
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```
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Component config --->
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newlib --- >
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newlib level(XXXX)
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( ) normal
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( ) nano
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```
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The normal "libc" has position argument, "long long" type data and float data
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transformation at function printf/scanf and so on. So it should cost more stack
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and heap, the test data as following:
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|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|--:|
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||Object||Origin newlib||||New newlib||||New newlib nano|||
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||||Start heap/byte|53000|||Start heap/byte|49184|||Start heap/byte||51824|
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||Fucntion||Stack/byte|Heap/byte|Heap cost/byte||Stack/byte|Heap/byte|Heap cost/byte||Stack/byte|Heap/byte|Heap cost/byte|
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||isalnum||96|53000|0||80|49184|0||80|51824|0|
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||isalpha||80|53000|0||64|49184|0||64|51824|0|
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||isspace||80|53000|0||64|49184|0||64|51824|0|
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||atoi||160|53000|0||144|49184|0||144|51824|0|
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||strtol||144|53000|0||128|49184|0||128|51824|0|
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||atof||224|53000|0||208|49184|0||208|51824|0|
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||atoff||224|53000|0||208|49184|0||208|51824|0|
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||strtod||208|53000|0||192|49184|0||192|51824|0|
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||strtof||208|53000|0||192|49184|0||192|51824|0|
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||asprintf||880|52616|384||1200|48800|384||608|51632|192|
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||sscanf ||1552|53000|0||2032|49184|0||1120|51824|0|
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||gmtime||944|52616|384||1040|48576|608||1296|51512|312|
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||localtime||160|53000|0||288|49184|0||288|51824|0|
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||mktime||320|53000|0||448|49184|0||448|51824|0|
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||asctime||768|52488|480||1264|48528|656||752|51464|360|
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||settimeofday||336|53000|0||320|49184|0||320|51824|0|
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||gettimeofday||480|53000|0||464|49184|0||464|51824|0|
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||localtime_r||304|53000|0||432|49184|0||432|51824|0|
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||asprintf（64bit）||752|52424|576||1136|48336|848||608|51272|552|
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||sscanf（64bit）||1056|53000|0||1376|49184|0||1040|51824|0|
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