将常量列表传递到 cmake 宏的方法？

发布于 2024-12-07 18:15:49 字数 352 浏览 1 评论 0原文

我有一个像这样的 CMake 宏：

macro( foo a b )
  list( FIND b ${a} is_found )
endmacro()

我尝试像这样调用它：

foo( "test" foo;bar;test )

这不起作用。这也不起作用：

foo( "test" "foo;bar;test" )

在所有情况下，我得到的 is_found 等于 -1，而实际上它应该已经找到了。我怎样才能像我想要的那样即时传递列表？

原文

I have a CMake macro like so:

macro( foo a b )
  list( FIND b ${a} is_found )
endmacro()

And I try to call it like so:

foo( "test" foo;bar;test )

This doesn't work. Also this does not work:

foo( "test" "foo;bar;test" )

In all cases I get is_found equal to -1, when in fact it should have been found. How can I pass in a list on-the-fly like I want to?

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感性不性感 2024-12-14 18:15:49

发生这种情况是因为宏的参数和特殊值（例如 ARGN）不是通常 CMake 意义上的变量。它们是字符串替换，就像 c 预处理器对宏所做的那样。

您可以将输入参数复制到变量，然后将该变量传递到列表查找：

macro( foo a )
  set( b "${ARGN}" )
  list( FIND b "${a}" is_found )
endmacro()

因此，以下所有变体都有效：

foo(test foo bar test foo )
foo("test" foo bar test foo )
foo(test foo;bar;test;foo )
foo("test" foo;bar;test;foo )
foo(test "foo;bar;test;foo" )
foo("test" "foo;bar;test;foo" )

更新，更通用的版本 - 在由“NEXTLIST”单词分隔的多个列表中搜索：

macro( foo a )
  set( is_found )
  set( foo_current_list )
  foreach( arg ${ARGN} )
    if( arg STREQUAL "NEXTLIST" )
      list( FIND foo_current_list "${a}" foo_is_found )
      list( APPEND is_found ${foo_is_found} )
      set( foo_current_list )
    else()
      list( APPEND foo_current_list ${arg} )
    endif()
  endforeach()
  list( FIND foo_current_list "${a}" foo_is_found )
  list( APPEND is_found ${foo_is_found} )
  unset( foo_is_found )
  unset( foo_current_list )
endmacro()

foo (test bar bar bar NEXTLIST foo test NEXTLIST test test x test)
message( "${is_found}" ) #-1;1;0

This happens because parameters of a macro and special values such as ARGN are not variables in the usual CMake sense. They are string replacements much like the c preprocessor would do with a macro.

You can copy input arguments to the variable and next pass that variable to list find:

macro( foo a )
  set( b "${ARGN}" )
  list( FIND b "${a}" is_found )
endmacro()

As result all the following variants work:

foo(test foo bar test foo )
foo("test" foo bar test foo )
foo(test foo;bar;test;foo )
foo("test" foo;bar;test;foo )
foo(test "foo;bar;test;foo" )
foo("test" "foo;bar;test;foo" )

Update, more generic version - search in several lists separated by "NEXTLIST" word:

macro( foo a )
  set( is_found )
  set( foo_current_list )
  foreach( arg ${ARGN} )
    if( arg STREQUAL "NEXTLIST" )
      list( FIND foo_current_list "${a}" foo_is_found )
      list( APPEND is_found ${foo_is_found} )
      set( foo_current_list )
    else()
      list( APPEND foo_current_list ${arg} )
    endif()
  endforeach()
  list( FIND foo_current_list "${a}" foo_is_found )
  list( APPEND is_found ${foo_is_found} )
  unset( foo_is_found )
  unset( foo_current_list )
endmacro()

foo (test bar bar bar NEXTLIST foo test NEXTLIST test test x test)
message( "${is_found}" ) #-1;1;0

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