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lto: fix documentation about -fpie and -fpic options 

gcc/ChangeLog:

	* doc/invoke.texi: Document how are pie and pic options merged.
This commit is contained in:
Martin Liska 2020-08-26 10:10:39 +02:00
parent e3684bcbf8
commit f523aaa039
1 changed files with 14 additions and 3 deletions
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17
gcc/doc/invoke.texi
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@ -11569,9 +11569,20 @@ There are some code generation flags preserved by GCC when
generating bytecodes, as they need to be used during the final link.
Currently, the following options and their settings are taken from
the first object file that explicitly specifies them:
@option{-fPIC}, @option{-fpic}, @option{-fpie}, @option{-fcommon},
@option{-fexceptions}, @option{-fnon-call-exceptions}, @option{-fgnu-tm}
and all the @option{-m} target flags.
@option{-fcommon}, @option{-fexceptions}, @option{-fnon-call-exceptions},
@option{-fgnu-tm} and all the @option{-m} target flags.
The following options @option{-fPIC}, @option{-fpic}, @option{-fpie} and
@option{-fPIE} are combined based on the following scheme:
@smallexample
@option{-fPIC} + @option{-fpic} = @option{-fpic}
@option{-fPIC} + @option{-fno-pic} = @option{-fno-pic}
@option{-fpic/-fPIC} + (no option) = (no option)
@option{-fPIC} + @option{-fPIE} = @option{-fPIE}
@option{-fpic} + @option{-fPIE} = @option{-fpie}
@option{-fPIC/-fpic} + @option{-fpie} = @option{-fpie}
@end smallexample
Certain ABI-changing flags are required to match in all compilation units,
and trying to override this at link time with a conflicting value