是否有 Fortran 编译器选项用于警告写入后写入冲突？
假设您有以下代码：
INTEGER :: num_samples
num_samples = 10000
num_samples = 1
显然，第一个 num_samples = 10000 没有执行任何操作，它的存在可能表明程序员错误（例如，程序员打算注释掉以下行，反之亦然） ）。是否有任何 Fortran 编译器会警告此类写入后写入错误，如果有，哪些选项会打开警告？ （我也很感兴趣是否有带有此类警告的 C++ 编译器，以及是否有提供此类警告的 Java IDE，但现在我专注于 Fortran 方面。）
Let's say you have the following code:
INTEGER :: num_samples
num_samples = 10000
num_samples = 1
Obviously, the first num_samples = 10000 does nothing, and its existence probably indicates a programmer error (e.g., the programmer meant to comment out the following line, or vice-versa). Are there any Fortran compilers that will warn for such write-after-write errors, and if so what options turn on the warning?
(I'm also interested if there are C++ compilers with such warnings, and if there are Java IDEs that provide such warnings, but right now I'm focusing on the Fortran side of things.)
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从我的角度来看，这是一个奇怪的问题。您提到的这种先写后写的情况是一个逻辑错误。编译器主要检测语法错误。在某些情况下，逻辑错误可能会表现为语法错误，但并非总是如此。
逻辑错误意味着您在实现算法时犯了错误。您只有在测试时才能注意到它。或者您也可以尝试静态程序分析（如 steabert 提到的）。
看一下函数式编程语言。由于不变性，写后写的情况不会发生。 ;-)
This is kind of strange question from my point of view. This write-after-write situation you mentioned is a logical error. Compilers detect mostly syntax errors. In some cases logical error may reveal themselves as syntax errors but not always.
A logical error means that you made a mistake in implementing your algorithm. You can notice it only upon testing. Or you can also try static program analysis (as steabert mentioned).
Take a look at functional programming languages. Due to immutability write-after-write situation just can't happen. ;-)