Lauri Kasanen wrote:
I'm seeing busybox dc acting funny when compiled with some versions of
gcc. This is on busybox git. The x86 binary busybox_unstripped and
config are attached.
gcc 4.2.2 - ok
gcc 4.7.2:
nc 10 1 add p
2.738e+93
So either bb is hitting a compiler bug, or undefined behavior somewhere
with new gcc's more aggressive optimizations.
I have 4.7.2 on x86 and I get 11 as output. You could add debug output
to push and pop to see what happens.
Whether the output 11 is to be expected is another question:
$ dc --version
dc (GNU bc 1.06.95) 1.3.95
$ dc --help
Usage: dc [OPTION] [file ...]
-e, --expression=EXPR evaluate expression
-f, --file=FILE evaluate contents of file
-h, --help display this help and exit
-V, --version output version information and exit
$ dc 10 1 add p
dc: Could not open file 10
dc: Could not open file 1
dc: Could not open file add
dc: Could not open file p
$ dc -e '10 1 add p'
$ dc -e '10 1 + p'
11
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