https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89524
Bug ID: 89524
Summary: -Wno-error doesn't work with warnings from newer
versions of GCC
Product: gcc
Version: 4.8.5
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: alexhenrie24 at gmail dot com
Target Milestone: ---
I am working on a Qt4 program that we need to compile with both GCC 4.8.5 and
GCC 8.2.0. The build process sets the -Werror option, but the Qt4 header files
trigger the new class-memaccess warning. I'd like to use
-Wno-error=class-memaccess to permit compilation and still see where we've made
this mistake in our own code, but on GCC 4.8.5 that option causes the following
error:
cc1plus: error: -Werror=class-memaccess: no option -Wclass-memaccess
So I am forced to disable the new warning altogether with -Wno-class-memaccess,
which both GCC 4.8.5 and GCC 8.2.0 accept.
You can reproduce the error on GCC 8.2.0 with any arbitrary C file, for
example:
$ gcc -Werror -Wno-error=foobar test.c
cc1: error: -Werror=foobar: no option -Wfoobar
Can we please avoid this problem in the future by ignoring
-Wno-error=<unknown-warning>?
