[英]C linker error with gcc and math.h
I am getting an error stating pythagorean.so: undefined symbol: cos
. 我收到错误消息,指出
pythagorean.so: undefined symbol: cos
。 I am compiling with the math.h
, stdlib.h
, and stdio.h
libraries and the -lm
switch. 我正在使用
math.h
, stdlib.h
和stdio.h
库以及-lm
开关进行编译。 Here a code snippet: 这里是一个代码片段:
static bool
law_of_cosine_run(esh_command* cmd)
{
if (strcmp(cmd->argv[0], "lawofcosine") == 0) {
printf("The length of the third side is: %f\n",
law_of_cosine(strtol(cmd->argv[1], NULL, 10),
strtol(cmd->argv[2], NULL, 10), strtol(cmd->argv[3], NULL, 10)));
return true;
}
return false;
}
static double
law_of_cosine(double x, double y, double z)
{
return sqrt((x * x) + (y * y) - (2 * x * y * cos(z)));
}
Does anyone know why this would occur? 有谁知道为什么会这样? pythagorean.c is my .c file.
pythagorean.c是我的.c文件。
Thanks 谢谢
编译时,请确保您键入
gcc *.c -lm
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