On 08/25/2015 10:48 AM, Stephan Gatzka wrote:
Hi! I'm a bit confused about the parameter I have to deliver to -frandom -seed. My manual page states it must be a number, others say it's a string. If I browse through the sources of gcc, it's also not not obvious to me. https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/common.opt;hb=HEAD https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/po/de.po;hb=HEAD So what's the correct parameter ffor -frandom-seed? A number (decimal/hex) or a string?
According to the online manual for the latest GCC it's supposed to be a non-negative number: $ gcc -v --help 2>&1 | grep random-seed -frandom-seed This switch lacks documentation -frandom-seed=<number> Make compile reproducible using <number> but it looks like there's a bug in the option's specification that prevents invalid (non-numeric) arguments from being diagnosed, making GCC accept anything (including negative numbers). The otherwise untested patch below fixes it for me and makes GCC accept only non-negative numbers. A bug should probably be filed for this. Martin diff --git a/gcc/common.opt b/gcc/common.opt index 4dcd518..4776d1f 100644 --- a/gcc/common.opt +++ b/gcc/common.opt @@ -1868,7 +1868,7 @@ frandom-seed Common Var(common_deferred_options) Defer frandom-seed= -Common Joined RejectNegative Var(common_deferred_options) Defer +Common Joined RejectNegative UInteger Var(common_deferred_options) Defer -frandom-seed=<number> Make compile reproducible using <number> ; This switch causes the command line that was used to create an
