質問編集履歴
1
ご回答を受けて修正したプログラムと実行結果
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### 補足情報（FW/ツールのバージョンなど）
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ターミナル2.9.5
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###ご回答を受けて修正したプログラムと実行結果
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出力結果がよりわからなくなったのですが、どのように修正していくべきでしょうか。
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measurement.c
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```c
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#include <stdio.h>
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#include "rdtsc.h" %<>にすると「 'rdtsc.h' file not found with <angled> include; use "quotes" instead」というerrorが表示されました
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int main(void){
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unsigned long long start = rdtsc();
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to_be_measured();
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unsigned long long stop = rdtsc();
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printf("measured time : %I64d [clock]\n", stop - start);
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return 0;
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}
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```
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出力
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```
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$ gcc -o measurement measurement.c
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measurement.c:6:5: warning: implicit declaration of function 'to_be_measured' is
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invalid in C99 [-Wimplicit-function-declaration]
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to_be_measured();
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^
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measurement.c:8:30: warning: length modifier 'I64' results in undefined behavior
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or no effect with 'd' conversion specifier [-Wformat]
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printf("measured time : %I64d [clock]\n", stop - start);
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~^~~~
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2 warnings generated.
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Undefined symbols for architecture x86_64:
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"_rdtsc", referenced from:
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_main in measurement-7e629d.o
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"_to_be_measured", referenced from:
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_main in measurement-7e629d.o
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ld: symbol(s) not found for architecture x86_64
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clang: error: linker command failed with exit code 1 (use -v to see invocation)
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```
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