\u6709\u65f6\u6211\u4eec\u4f1a\u9047\u5230\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u6267\u884c\u7a0b\u5e8f\u9700\u8981\u94fe\u63a5\u4e00\u4e9b\u9759\u6001\u5e93\uff0c\u4f46\u662f\u9759\u6001\u5e93\u4e2d\u7684\u51fd\u6570\u5e76\u6ca1\u6709\u5168\u90e8\u4f7f\u7528\uff0c\u53ea\u7528\u4e86\u5176\u4e2d\u7684\u51e0\u4e2a\uff0c\u4f46\u662f\u7cfb\u7edf\u9ed8\u8ba4\u4f1a\u81ea\u52a8\u628a\u6574\u4e2a\u9759\u6001\u5e93\u5168\u90e8\u94fe\u63a5\u5230\u53ef\u6267\u884c\u7a0b\u5e8f\u4e2d\uff0c\u9020\u6210\u53ef\u6267\u884c\u7a0b\u5e8f\u7684\u5927\u5c0f\u5927\u5927\u589e\u52a0\uff0c\u6d6a\u8d39\u4e86flash\u7a7a\u95f4\u548c\u5185\u5b58\u7a7a\u95f4\u3002gcc\u4e3a\u6211\u4eec\u63d0\u4f9b\u7684\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\u3002<\/p>\n
GCC\u5728\u7f16\u8bd1\u65f6\u53ef\u4ee5\u4f7f\u7528 -ffunction-sections \u548c -fdata-sections \u5c06\u6bcf\u4e2a\u51fd\u6570\u6216\u7b26\u53f7\u521b\u5efa\u4e3a\u4e00\u4e2asections\uff0c\u5176\u4e2d\u6bcf\u4e2asections\u540d\u4e0efunction\u6216data\u540d\u4fdd\u6301\u4e00\u81f4\u3002\u800c\u5728\u94fe\u63a5\u9636\u6bb5\uff0c -Wl,\u2013gc-sections \u6307\u793a\u94fe\u63a5\u5668\u53bb\u6389\u4e0d\u7528\u7684section\uff08\u5176\u4e2d-wl, \u8868\u793a\u540e\u9762\u7684\u53c2\u6570 -gc-sections \u4f20\u9012\u7ed9\u94fe\u63a5\u5668\uff09\uff0c\u8fd9\u6837\u5c31\u80fd\u51cf\u5c11\u6700\u7ec8\u7684\u53ef\u6267\u884c\u7a0b\u5e8f\u7684\u5927\u5c0f\u4e86\u3002<\/p>\n
\u65b9\u6cd51\uff1a
\n\u901a\u8fc7gcc\u7684-ffunction-sections\u548c-fdata-sections\u9009\u9879\u4e0eld\u7684–gc-sections\u9009\u9879 <\/p>\n
arm-linux-gcc -Os -ffunction-sections -fdata-sections -o boot.o boot.S
\narm-linux-gcc -Os -ffunction-sections -fdata-sections -o main.o main.c
\narm-linux-ld -T link.lds –gc-sections -o target.bin boot.o main.o <\/p>\n
-ffunction-sections, -fdata-sections\u4f1a\u4f7fcompiler\u4e3a\u6bcf\u4e2afunction\u548cdata item\u5206\u914d\u72ec\u7acb\u7684section\u3002 –gc-sections\u4f1a\u4f7fld\u5220\u9664\u6ca1\u6709\u88ab\u4f7f\u7528\u7684section\u3002\u94fe\u63a5\u64cd\u4f5c\u4ee5section\u4f5c\u4e3a\u6700\u5c0f\u7684\u5904\u7406\u5355\u5143\uff0c\u53ea\u8981\u4e00\u4e2asection\u4e2d\u6709\u67d0\u4e2a\u7b26\u53f7\u88ab\u5f15\u7528\uff0c\u8be5section\u5c31\u4f1a\u88ab\u653e\u5165output\u4e2d\u3002\u8fd9\u4e9b\u9009\u9879\u4e00\u8d77\u4f7f\u7528\u4f1a\u4ece\u6700\u7ec8\u7684\u8f93\u51fa\u6587\u4ef6\u4e2d\u5220\u9664\u6240\u6709\u672a\u88ab\u4f7f\u7528\u7684function\u548cdata\uff0c \u53ea\u5305\u542b\u7528\u5230\u7684unction\u548cdata\u3002<\/p>\n
Linux \u5982\u4f55\u8bbe\u7f6e\u7f16\u8bd1\u9009\u9879\u53ea\u94fe\u63a5\u8c03\u7528\u7684\u51fd\u6570
\n1\u3001\u7f16\u8bd1\u65f6\u5019\uff0cGCC\u9009\u9879\u6dfb\u52a0
\n COMPILE_FLAGS += -ffunction-sections -fdata-sections
\n2\u3001LD\u9009\u9879\u6dfb\u52a0
\n LDFLAGS += -Wl,-gc-sections <\/p>\n
\u65b9\u6cd52\uff1a\u4f7f\u7528strip(\u4e0d\u540c\u7f16\u8bd1\u5668\u6b64\u540d\u79f0\u4e0d\u76f8\u540c)<\/p>\n
strip\u7ecf\u5e38\u7528\u6765\u53bb\u9664\u76ee\u6807\u6587\u4ef6\u4e2d\uff08\u9759\u6001\u5e93\/\u52a8\u6001\u5e93\uff09\u7684\u4e00\u4e9b\u7b26\u53f7\u8868\u3001\u8c03\u8bd5\u7b26\u53f7\u8868\u4fe1\u606f,\u51cf\u5c11\u5305\u7684\u5927\u5c0f\u3002\u4f7f\u7528nm\u547d\u4ee4\u53ef\u4ee5\u67e5\u770b\u5e93\u6587\u4ef6\u7684\u7b26\u53f7\u6e05\u5355\u3002<\/p>\n
*.o *.a\u9700\u8981\u52a0–strip-unneeded\u53c2\u6570\uff0c\u5426\u5219\u94fe\u63a5\u7684\u65f6\u5019\u4f1a\u51fa\u9519\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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