在iOS上使用tgmath我需要怎么做? [英] What do I need to do to use tgmath on iOS?

问题描述

我正在编译启用了64位支持的第一个项目.我遇到一堆有关隐式转换为浮动的编译器警告.之所以发生这种情况，是因为我正在使用fabsf()并将结果分配给CGFloat(这是两倍，而不是在新的64位体系结构上浮动).

I'm compiling my first project with 64 bit support enabled. I'm running into a bunch of compiler warnings about implicit conversions to float. This is happening because I'm using fabsf() and assigning the result to a CGFloat (which is a double, not float on the new 64 bit architecture).

根据该问题的答案:

基于CGFloat的数学函数?

我只需要#include <tgmath.h>即可解决此问题，并且可能将fabsf更改为fabs.我至少有一个文件似乎没有帮助.我仍然收到警告:implicit conversion loses floating-point precision 'double' to 'CGFloat' aka (float).这是生成该警告的行:

I just need to #include <tgmath.h> to solve this problem and probably change fabsf to fabs. I have at least one file where this doesn't seem to be helping. I still get the warning: implicit conversion loses floating-point precision 'double' to 'CGFloat' aka (float). Here's the line that generates that warning:

CGFloat deltaX = fabs(item.center.x-point.x);

还有其他人遇到吗?您是如何解决的?我宁愿不禁用此警告，也不用大量类型转换来浪费我的代码.

Has anyone else run across this? How did you solve it? I'd rather not disable this warning or litter my code with a ton of typecasts.

推荐答案

通过在PCH文件顶部添加标头，我能够使用tgmath.h函数.

I was able to get the tgmath.h functions to work by including the header at the top of my PCH file.

在某个时候(阅读:Xcode更新)，我不得不开始禁用模块才能使其正常工作.此类的详细信息位于> Dima链接至以下内容

At some point (read: Xcode update) I had to start disabling Modules to get this to work. The details of such are in the question Dima links to below.

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