The most useful GCC options and extensions • Hacker News Board

Re: The most useful GCC options and extensions

#11

Post by 1amzave » Mon, Jul 11, 2011, 11:42 PM UTC

zokier wrote: post #10

matthavener wrote: post #2

A few others I use are -Wsign-compare and -Wformat-nonliteral. Sign compare warns on possible bugs/vulnerabilities due to comparing signed and unsigned values. Using nonliteral formats can lead to vulnerabilities (such as the famous attacks on FTP servers http://seclists.org/bugtraq/1999/Sep/328 )

-Wall includes -Wsign-compare

You must be a C++ user -- I (a C guy) immediately thought "what? No, that's in -Wextra, not -Wall", checked the man page to confirm, and sure enough, it differs (-Wall includes sign-compare when compiling C++, but not C).

Re: The most useful GCC options and extensions

#12

Post by 16s » Mon, Jul 11, 2011, 11:43 PM UTC

Is it me, or is this statement from the article wrong:

"All warnings can be enabled with -w."

man g++ says:

"-w Inhibit all warning messages."

Inhibit means to prevent (not to enable).

Re: The most useful GCC options and extensions

#13

Post by rnicholson » Mon, Jul 11, 2011, 11:54 PM UTC

No love for --coverage?

Re: The most useful GCC options and extensions

#14

Post by DarkShikari » Mon, Jul 11, 2011, 11:56 PM UTC

pwpwp wrote: post #9

My favorite is the "weak" attribute. http://gcc.gnu.org/onlinedocs/gcc/Function-Attributes.html Makes separate compilation for languages that compile to C much easier.

My favorite would be "pure" -- it's perfect for saying "this function pointer, which calls an assembly function, doesn't muck with any of your data structures, so you don't have to reload every single pointer after it returns".

But unfortunately, since it was basically written only for libc purposes, it doesn't work on function pointers, so it's useless for this purpose.

Re: The most useful GCC options and extensions

#15

Post by freedrull » Tue, Jul 12, 2011, 12:31 AM UTC

rnicholson wrote: post #13

No love for --coverage?

A similar article about C code coverage tools would be great.

Re: The most useful GCC options and extensions

#16

Post by freedrull » Tue, Jul 12, 2011, 1:14 AM UTC

-fmudflap always interested me, but I never seem to remember it when I'm actually confronting a hard to debug pointer issue.

Re: The most useful GCC options and extensions

#17

Post by rat » Tue, Jul 12, 2011, 1:58 AM UTC

gaius wrote: post #7

"If Java had true garbage collection, most programs would delete themselves upon execution." — Robert Sewell Nice ;-)

How is that nice? And I can't find this quote in the article.

Re: The most useful GCC options and extensions

#18

Post by billswift » Tue, Jul 12, 2011, 2:46 AM UTC

16s wrote: post #12

Is it me, or is this statement from the article wrong: "All warnings can be enabled with -w." man g++ says: "-w Inhibit all warning messages." Inhibit means to prevent (not to enable).

It is case sensitive; -W enables more warnings, not -w, which as you noticed suppresses them.

Re: The most useful GCC options and extensions

#19

Post by gaius » Tue, Jul 12, 2011, 4:52 AM UTC

rat wrote: post #17

gaius wrote: post #7

"If Java had true garbage collection, most programs would delete themselves upon execution." — Robert Sewell Nice ;-)

How is that nice? And I can't find this quote in the article.

It's in the sidebar. Just amused me is all.

Re: The most useful GCC options and extensions

#20

Post by antoarts » Tue, Jul 12, 2011, 8:24 AM UTC

gaius wrote: post #19

rat wrote: post #17

Earlier quoted context omitted.

How is that nice? And I can't find this quote in the article.

It's in the sidebar. Just amused me is all.

The quotes are randomly chosen from a database of my favorite ~50 quotes, so it isn't related to the article, though