我需要做什么才能在 iOS 上使用 tgmath? [英] What do I need to do to use tgmath on iOS?
问题描述
我正在编译我的第一个项目并启用 64 位支持.我遇到了一堆关于隐式转换为浮点数的编译器警告.发生这种情况是因为我正在使用 fabsf() 并将结果分配给一个 CGFloat(在新的 64 位架构上这是一个双精度值，而不是浮点值).
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).
根据这个问题的答案:
我只需要#include 来解决这个问题，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 lost 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);
有没有其他人遇到过这个问题?你是怎么解决的?我宁愿不禁用此警告或用大量类型转换乱扔我的代码.
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
通过在我的 PCH 文件顶部包含标题，我能够使 tgmath.h 函数工作.
I was able to get the tgmath.h functions to work by including the header at the top of my PCH file.
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在某些时候(阅读:Xcode 更新)，我必须开始禁用模块才能使其正常工作.此类详细信息在问题 Dima 链接中.
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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