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tl;dr I'd like to learn a compact, cross-compiler way of selectively suppressing compiler warnings. Consider the case where you really mean to make an exact floating-point comparison using ==, o...
#2: Post edited
by
Alexei
·
2021-01-22T07:33:22Z (over 3 years ago)
added relevant tags
**tl;dr** I'd like to learn a compact, cross-compiler way of selectively suppressing compiler warnings.- ---
- Consider the case where you really mean to make an exact floating-point comparison using `==`, or the case where you capture a return value that you don't use in production but want to `assert` on in debug.
- If you are running your compiler with a highly level of feedback you're going to get a warnings from the first all the time and from the second when performing a release build.
- Now, most compilers have a way to annotate a symbol to let the compiler know you're aware of the situation (for instance `__attribute__((unused))` in gcc), and various pre-processor pragmas to adjust the compilation envrionment. But we have three compilers to worry about (gcc and msvc for actually building the code on different target platforms and clang as a linter on both).
- In some places we actually have painfully heavy and intrusive pre-processor constructs like:
- ```c++
- #if defined(_MSC_VER)
- #pragma warnings(push)
- #pramga warnings(disable : 123456)
- #elif defined(__clang__)
- #pragma clang diagnostic push
- #pramga clang diagnostic ignored "-Wluggage-combination"
- #elif defined(__GNUC__)
- #pragma GCC diagnostic push
- #pramga GCC diagnostic ignored "-Wcode-for-my-luggage"
- #endif
- // Offending line(s) of code
- #if defined(_MSC_VER)
- #pragma warnings(pop)
- #elif defined(__clang__)
- #pragma clang diagnostic pop
- #elif defined(__GNUC__)
- #pragma GCC diagnostic pop
- #endif
- ```
- Which, though ugly as sin, works and doesn't cause too much nausea if it occurs once in a low-level module that you don't touch often.
- But I feel that it should be easier and neater.
- Anyone have a working solution?
- []()**tl;dr** I'd like to learn a compact, cross-compiler way of selectively suppressing compiler warnings.
- ---
- Consider the case where you really mean to make an exact floating-point comparison using `==`, or the case where you capture a return value that you don't use in production but want to `assert` on in debug.
- If you are running your compiler with a highly level of feedback you're going to get a warnings from the first all the time and from the second when performing a release build.
- Now, most compilers have a way to annotate a symbol to let the compiler know you're aware of the situation (for instance `__attribute__((unused))` in gcc), and various pre-processor pragmas to adjust the compilation envrionment. But we have three compilers to worry about (gcc and msvc for actually building the code on different target platforms and clang as a linter on both).
- In some places we actually have painfully heavy and intrusive pre-processor constructs like:
- ```c++
- #if defined(_MSC_VER)
- #pragma warnings(push)
- #pramga warnings(disable : 123456)
- #elif defined(__clang__)
- #pragma clang diagnostic push
- #pramga clang diagnostic ignored "-Wluggage-combination"
- #elif defined(__GNUC__)
- #pragma GCC diagnostic push
- #pramga GCC diagnostic ignored "-Wcode-for-my-luggage"
- #endif
- // Offending line(s) of code
- #if defined(_MSC_VER)
- #pragma warnings(pop)
- #elif defined(__clang__)
- #pragma clang diagnostic pop
- #elif defined(__GNUC__)
- #pragma GCC diagnostic pop
- #endif
- ```
- Which, though ugly as sin, works and doesn't cause too much nausea if it occurs once in a low-level module that you don't touch often.
- But I feel that it should be easier and neater.
- Anyone have a working solution?
#1: Initial revision
by
dmckee
·
2021-01-20T20:19:44Z (over 3 years ago)
Scheme for cross-platform warning control?
**tl;dr** I'd like to learn a compact, cross-compiler way of selectively suppressing compiler warnings.
---
Consider the case where you really mean to make an exact floating-point comparison using `==`, or the case where you capture a return value that you don't use in production but want to `assert` on in debug.
If you are running your compiler with a highly level of feedback you're going to get a warnings from the first all the time and from the second when performing a release build.
Now, most compilers have a way to annotate a symbol to let the compiler know you're aware of the situation (for instance `__attribute__((unused))` in gcc), and various pre-processor pragmas to adjust the compilation envrionment. But we have three compilers to worry about (gcc and msvc for actually building the code on different target platforms and clang as a linter on both).
In some places we actually have painfully heavy and intrusive pre-processor constructs like:
```c++
#if defined(_MSC_VER)
#pragma warnings(push)
#pramga warnings(disable : 123456)
#elif defined(__clang__)
#pragma clang diagnostic push
#pramga clang diagnostic ignored "-Wluggage-combination"
#elif defined(__GNUC__)
#pragma GCC diagnostic push
#pramga GCC diagnostic ignored "-Wcode-for-my-luggage"
#endif
// Offending line(s) of code
#if defined(_MSC_VER)
#pragma warnings(pop)
#elif defined(__clang__)
#pragma clang diagnostic pop
#elif defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
```
Which, though ugly as sin, works and doesn't cause too much nausea if it occurs once in a low-level module that you don't touch often.
But I feel that it should be easier and neater.
Anyone have a working solution?