| Цитата(bsa @ 3.5.2011, 21:56) | | Цитата(man gcc) | -M Instead of outputting the result of preprocessing, output a rule
suitable for make describing the dependencies of the main source
file. The preprocessor outputs one make rule containing the object
file name for that source file, a colon, and the names of all the
included files, including those coming from -include or -imacros
command line options.
Unless specified explicitly (with -MT or -MQ), the object file name
consists of the name of the source file with any suffix replaced
with object file suffix and with any leading directory parts
removed. If there are many included files then the rule is split
into several lines using \-newline. The rule has no commands.
This option does not suppress the preprocessor's debug output, such
as -dM. To avoid mixing such debug output with the dependency
rules you should explicitly specify the dependency output file with
-MF, or use an environment variable like DEPENDENCIES_OUTPUT.
Debug output will still be sent to the regular output stream as
normal.
-MF file
When used with -M or -MM, specifies a file to write the
dependencies to. If no -MF switch is given the preprocessor sends
the rules to the same place it would have sent preprocessed output.
When used with the driver options -MD or -MMD, -MF overrides the
default dependency output file.
-MD -MD is equivalent to -M -MF file, except that -E is not implied.
The driver determines file based on whether an -o option is given.
If it is, the driver uses its argument but with a suffix of .d,
otherwise it takes the name of the input file, removes any
directory components and suffix, and applies a .d suffix.
If -MD is used in conjunction with -E, any -o switch is understood
to specify the dependency output file, but if used without -E, each
-o is understood to specify a target object file.
Since -E is not implied, -MD can be used to generate a dependency
output file as a side-effect of the compilation process.
-MMD
Like -MD except mention only user header files, not system header
files.
-MT target
Change the target of the rule emitted by dependency generation. By
default CPP takes the name of the main input file, deletes any
directory components and any file suffix such as .c, and appends
the platform's usual object suffix. The result is the target.
An -MT option will set the target to be exactly the string you
specify. If you want multiple targets, you can specify them as a
single argument to -MT, or use multiple -MT options.
For example, -MT '$(objpfx)foo.o' might give
$(objpfx)foo.o: foo.c |
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не понятно несколько моментов
1) как в мане(не в гугле) быстро найти место относящееся к нужным флагам, что-бы не читать 50 страниц про ARM, Preprocessor и все остальное (что-то типо man gcc -MM )
2) почему Эклипсе под Линукс строит мэйк файл а под винду нет? и как это изменить в настройках среды (это не форум Эклипса но тем не менее ,в гугле искал ничего толкового не нашел)
3) Что делать с оптимизацией? , из каких соображений исходить устанавливая уровень ?
4) Для чего во многих IDE eсть Release mode & Debug mode ? если можно просто добавить флаг - g ?? |
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