| Summary: | Usage of I (_Complex_I) from complex.h results in unexpected warnings with clang -pedantic | ||||||
|---|---|---|---|---|---|---|---|
| Product: | Base System | Reporter: | Andrey Alexeyev <akari> | ||||
| Component: | standards | Assignee: | freebsd-standards (Nobody) <standards> | ||||
| Status: | New --- | ||||||
| Severity: | Affects Some People | CC: | akari, lwhsu | ||||
| Priority: | --- | ||||||
| Version: | CURRENT | ||||||
| Hardware: | Any | ||||||
| OS: | Any | ||||||
| Attachments: |
|
||||||
Created attachment 181784 [details] the test program Compile the attached test program with: clang -std=c11 -pedantic test.c -o test This is expected to compile without warnings. However, it produces an "imaginary constants is a GNU extension" warning on FreeBSD. This is because _Complex_I is defined as ((float _Complex)1.0i) in /usr/include/complex.h. The easiest workaround would be to use __extension__ to suppress the warning, i.e. redefine _Complex_I as (__extension__ (float _Complex)1.0i). This is what glibc does as well. It's a minor issue, but it prevents a project I'm working on from building with -Wall on FreeBSD.