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Full Discussion: C. To segmentation fault or not to segmentation fault, that is the question.
Top Forums Programming C. To segmentation fault or not to segmentation fault, that is the question. Post 303032359 by Corona688 on Friday 15th of March 2019 02:49:05 PM
Old 03-15-2019
I've seen similar things in lots of code ported to different architectures. Quite a few different gotchas where something you can ignore harmlessly on one system, explodes on another, because something you took for granted has changed.

If you forget to include stdlib.h and math.h, your code may still work in 32-bit. It will assume these undeclared functions take all-integers and fill in the blanks. On a 64-bit system, where pointers are twice as large, that assumption is catastrophically wrong and causes memory addresses to get mangled, causing a crash.

Also, some systems let you do this, but don't depend on it, because most don't:
Code:
char *stuff="abcdefg";
stuff[2]='Q';

This User Gave Thanks to Corona688 For This Post:
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LEARN ABOUT MOJAVE

extutils::mm_win325.18

ExtUtils::MM_Win32(3pm) 				 Perl Programmers Reference Guide				   ExtUtils::MM_Win32(3pm)

NAME

       ExtUtils::MM_Win32 - methods to override UN*X behaviour in ExtUtils::MakeMaker

SYNOPSIS

	use ExtUtils::MM_Win32; # Done internally by ExtUtils::MakeMaker if needed

DESCRIPTION

       See ExtUtils::MM_Unix for a documentation of the methods provided there. This package overrides the implementation of these methods, not
       the semantics.

   Overridden methods
       dlsyms
       replace_manpage_separator
	   Changes the path separator with .

       maybe_command
	   Since Windows has nothing as simple as an executable bit, we check the file extension.

	   The PATHEXT env variable will be used to get a list of extensions that might indicate a command, otherwise .com, .exe, .bat and .cmd
	   will be used by default.

       init_DIRFILESEP
	   Using  for Windows.

       init_tools
	   Override some of the slower, portable commands with Windows specific ones.

       init_others
	   Override the default link and compile tools.

	   LDLOADLIBS's default is changed to $Config{libs}.

	   Adjustments are made for Borland's quirks needing -L to come first.

       init_platform
	   Add MM_Win32_VERSION.

       platform_constants
       constants
	   Add MAXLINELENGTH for dmake before all the constants are output.

       special_targets
	   Add .USESHELL target for dmake.

       static_lib
	   Changes how to run the linker.

	   The rest is duplicate code from MM_Unix.  Should move the linker code to its own method.

       dynamic_lib
	   Complicated stuff for Win32 that I don't understand. :(

       extra_clean_files
	   Clean out some extra dll.{base,exp} files which might be generated by gcc.  Otherwise, take out all *.pdb files.

       init_linker
       perl_script
	   Checks for the perl program under several common perl extensions.

       xs_o
	   This target is stubbed out.	Not sure why.

       pasthru
	   All we send is -nologo to nmake to prevent it from printing its damned banner.

       arch_check (override)
	   Normalize all arguments for consistency of comparison.

       oneliner
	   These are based on what command.com does on Win98.  They may be wrong for other Windows shells, I don't know.

       cd  dmake can handle Unix style cd'ing but nmake (at least 1.5) cannot.	It wants:

	       cd dir1dir2
	       command
	       another_command
	       cd ....

       max_exec_len
	   nmake 1.50 limits command length to 2048 characters.

       os_flavor
	   Windows is Win32.

       cflags
	   Defines the PERLDLL symbol if we are configured for static building since all code destined for the perl5xx.dll must be compiled with
	   the PERLDLL symbol defined.

perl v5.18.2							    2014-01-06						   ExtUtils::MM_Win32(3pm)
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