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| From: | Paul Eggert |
| Subject: | bug#69770: [PATCH] build: strengthen 16 bit float support checks |
| Date: | Wed, 13 Mar 2024 22:59:36 -0700 |
| User-agent: | Mozilla Thunderbird |
On 2024-03-12 19:24, Grisha Levit wrote:
- AC_COMPILE_IFELSE( + AC_RUN_IFELSE(
This sort of change would break cross-compilation, no?How about leaving it AC_COMPILE_IFELSE, but ensuring that -O1 or better is used when the compiler supports -O1? That way we don't have to worry about running the program, because (with the "volatile") clang will error out.
Alternatively perhaps there's some way to check for the bug using preprocessor macros like __FLT16_MANT_DIG__, __FLT16_MAX_EXP__, __clang_major__, and __aarch64__. (This could be more fragile, though, as clang presumably will fix the bug eventually.)
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