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[flang-rt][build] Disable build-time warning of '-Wshift-count-negative' from g++ compiler and remove unsupported floating-point data. (#174915)

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When building the flang-rt project with the g++ compiler on Linux-X86_64
machine, the compiler gives the following warning:

```
llvm-project/flang-rt/lib/runtime/extensions.cpp:455:26: warning: left shift count is negative [-Wshift-count-negative]
   455 |     mask = ~(unsigned)0u << ((8 - digits) * 4 + 1);
       |            ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

```

All the discussion records see:
https://github.com/llvm/llvm-project/pull/173955

Co-authored-by: liao jun <liaojun@ultrarisc.com>
This commit is contained in:
liao jun 2026-01-09 21:19:40 +08:00 committed by GitHub
parent 687eb2c532
commit 8a922e8151
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1 changed files with 1 additions and 3 deletions
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flang-rt/lib/runtime/extensions.cpp
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@ -449,10 +449,8 @@ float RTNAME(Rand)(int *i, const char *sourceFile, int line) {
unsigned mask = 0;
constexpr int radix = std::numeric_limits<float>::radix;
constexpr int digits = std::numeric_limits<float>::digits;
if (radix == 2) {
if constexpr (radix == 2) {
mask = ~(unsigned)0u << (32 - digits + 1);
} else if (radix == 16) {
mask = ~(unsigned)0u << ((8 - digits) * 4 + 1);
} else {
Terminator terminator{sourceFile, line};
terminator.Crash("Radix unknown value.");