https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91220
Bug ID: 91220
Summary: -Q --help=common displays options limited to subsets
of languages
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: driver
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
While testing a fix for bug 80545 I noticed that the --help=common option has
GCC list options that are only available in a subset of languages even though
it is documented to "Display the options that are common to all languages."
Here's the output for a subset of language-specific options:
$ gcc -Q --help=common -xc - | grep -E
"(-Wcpp|-Wdeprecated|-Wmisleading-indentation|-Wstrict-aliasing|-Wstrict-overflow|-Wsystem-headers|-Wunused)"
-Wcpp [enabled]
-Wdeprecated [enabled]
-Wdeprecated-declarations [enabled]
-Wmisleading-indentation [disabled]
-Wstrict-aliasing
-Wstrict-aliasing=<0,3> 0
-Wstrict-overflow
-Wstrict-overflow=<0,5> 0
-Wsystem-headers [disabled]
-Wunused [disabled]
-Wunused-but-set-parameter [disabled]
-Wunused-but-set-variable [disabled]
-Wunused-function [disabled]
-Wunused-label [disabled]
-Wunused-parameter [disabled]
-Wunused-value [disabled]
-Wunused-variable [disabled]
The following is the output of GCC patched to list the strict subset of
languages in which each of the options is available in, and configured with
-enable-languages=all:
-Wcpp [available in C, C++, ObjC, ObjC++]
-Wdeprecated [available in C, C++, D, ObjC, ObjC++]
-Wdeprecated-declarations [enabled]
-Wmisleading-indentation [available in C, C++]
-Wstrict-aliasing [enabled]
-Wstrict-aliasing=<0,3> [available in C, C++, ObjC, ObjC++]
-Wstrict-overflow [enabled]
-Wstrict-overflow=<0,5> [available in C, C++, ObjC, ObjC++]
-Wsystem-headers [available in C, C++, ObjC, ObjC++]
-Wunused [available in C, C++, ObjC, ObjC++]
-Wunused-but-set-parameter [disabled]
-Wunused-but-set-variable [disabled]
-Wunused-function [disabled]
-Wunused-label [disabled]
-Wunused-parameter [disabled]
-Wunused-value [disabled]
-Wunused-variable [available in C, C++, ObjC, ObjC++]
