main.c: <stdlib.h> is needed, to introduce the getenv(3) prototype declaration. Without it a C compiler shall infer the getenv type as "int getenv(...);", but this is totally wrong, especially when your machine's sizeof(int) and sizeof(char*) differs. On such environment a return value of getenv(3), which is in fact a char*, might first casted into a int (loses data here), and then casted back to char* by automatic integral promotion fo fit to the prototype of ruby_set_debug_option().
Added by shyouhei (Shyouhei Urabe) about 15 years ago
prototype declaration. Without it a C compiler shall infer
the getenv type as "int getenv(...);", but this is totally
wrong, especially when your machine's sizeof(int) and
sizeof(char*) differs. On such environment a return value
of getenv(3), which is in fact a char*, might first casted
into a int (loses data here), and then casted back to char*
by automatic integral promotion fo fit to the prototype of
ruby_set_debug_option().
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29658 b2dd03c8-39d4-4d8f-98ff-823fe69b080e