CLang flags query:: I'm wanting to port software to FreeBSD
Charles Swiger
cswiger at mac.com
Thu Feb 27 02:39:47 UTC 2014
Hi--
On Feb 26, 2014, at 3:43 PM, Joe Nosay <superbisquit at gmail.com> wrote:
> I've noticed different flags such as -Wno-parentheses and such along with
> the -Wno-unused-variable. I would like to know where would be a good source
> online to find the flags;
For compatibility, clang understands the commonly used -W flags that gcc uses.
More documentation is here:
http://clang.llvm.org/docs/UsersManual.html
...and normally folks use -Wall, -Wpedantic, or -Weverything. However, if you truly
want the complete list, run clang's "diagtool list-warnings":
% clang/Debug+Asserts/bin/diagtool list-warnings
Warnings with flags (924):
backslash_newline_space [-Wbackslash-newline-escape]
escaped_newline_block_comment_end [-Wcomment]
ext_abstract_pack_declarator_parens [-Wanonymous-pack-parens]
ext_aggregate_init_not_constant [-Wc99-extensions]
[ ... ]
warn_zero_size_struct_union_in_extern_c [-Wextern-c-compat]
Warnings without flags (111):
ext_delete_void_ptr_operand
[ ... ]
warn_weak_identifier_undeclared
warn_weak_import
STATISTICS:
Percentage of warnings with flags: 89.28%
Number of unique flags: 394
Average number of diagnostics per flag: 2.345
Number in -Wpedantic (not covered by other -W flags): 28
> and, I would like to know what flags are used by porters to optimize builds.
The default CFLAGS should be respected, unless a port needs something in particular
in order to work; see:
http://www.freebsd.org/doc/en/books/porters-handbook/dads-cflags.html
> These will be placed on the Makefile of the source such that it can be built natively
> on FreeBSD. I would be able to test software.
Good luck; and note that the entire porter's handbook is worth a read. :-)
Regards,
--
-Chuck
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