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| author | Mike Sperber <[email protected]> | 2012-03-22 18:00:31 +0100 |
|---|---|---|
| committer | Mike Sperber <[email protected]> | 2012-03-23 09:15:19 +0100 |
| commit | 933e701dac1936c6f15c765b5687fbc623464ec7 (patch) | |
| tree | 95bef4a51a14f512c23348e39cbfb336bc22475b /xcomp/README.md | |
| parent | 3087769515ea9bfc75f7d7b8897bc897c7f13931 (diff) | |
| download | otp-933e701dac1936c6f15c765b5687fbc623464ec7.tar.gz otp-933e701dac1936c6f15c765b5687fbc623464ec7.tar.bz2 otp-933e701dac1936c6f15c765b5687fbc623464ec7.zip | |
Unbreak floating point on middle-endian machines.
On some ARMs (and maybe other platforms), doubles are stored with the
the two 32-bit words reversed with respect to more common
architectures.
The symptom is this:
> io_lib:write(1.0).
"0.000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000005299808824"
Detect that and account for it when decoding floats.
Diffstat (limited to 'xcomp/README.md')
| -rw-r--r-- | xcomp/README.md | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/xcomp/README.md b/xcomp/README.md index 2d79107283..98e71d5962 100644 --- a/xcomp/README.md +++ b/xcomp/README.md @@ -430,6 +430,14 @@ When a variable has been set, no warning will be issued. `configure` will fail unless this variable is set. Since no default value is used, `configure` will try to figure this out automatically. +* `erl_xcomp_double_middle` - `yes|no`. No default. If `yes`, the + target system must have doubles in "middle-endian" format. If + `no`, it has "regular" endianness. This can often be automatically + detected, but not always. If not automatically detected, + `configure` will fail unless this variable is set. Since no + default value is used, `configure` will try to figure this out + automatically. + * `erl_xcomp_clock_gettime_cpu_time` - `yes|no`. Defaults to `no`. If `yes`, the target system must have a working `clock_gettime()` implementation that can be used for retrieving process CPU time. |