错误消息：“AMDEP”从未定义过(Error message: “AMDEP” was never defined)

错误消息：“AMDEP”从未定义过(Error message: “AMDEP” was never defined)

我有一个configure.ac ，其中我通过不同的配置选项启用不同的编译器。 configure脚本生成成功，但最后（调用AC_OUTPUT ）我收到一条错误消息：

configure: error: conditional "AMDEP" was never defined. Usually this means the macro was only invoked conditionally.

遗憾地查看config.log没有帮助，我不知道是什么原因导致此错误或从哪里开始搜索。

I have a configure.ac in which I enable different compilers by different configure options. The configure script is generated successfully but at the end (call to AC_OUTPUT) I get an error message:

configure: error: conditional "AMDEP" was never defined. Usually this means the macro was only invoked conditionally.

Sadly looking into config.log does not help and I have no idea what causes this error or where to start searching.

最满意答案

显然你不能在if块中嵌入AM_PROG_CC ， AM_PROG_CPP或AM_PROG_CXX （无论出于何种原因）。 解决方案是在if块中设置一个变量并将其传递给AM_PROG_ *。

Apparently you cannot embed AM_PROG_CC, AM_PROG_CPP or AM_PROG_CXX in an if block (for whatever reason). Solution was to set a variable in the if block and pass it to AM_PROG_*.