https://bugs.llvm.org/show_bug.cgi?id=38231
Bug ID: 38231
Summary: -w does not suppress warnings promoted to errors with
-Werror=…
Product: clang
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: bba...@google.com
CC: llvm-bugs@lists.llvm.org
When run with -w, GCC disables all warnings, including those which have been
explicitly promoted to errors with -Werror=warningname. Clang’s -w disables all
warnings *except* those which have been so promoted. For example:
$ cat <<EOF >c.c
> void f() {
> int x;
> if (x = 1) {}
> }
> EOF
$ gcc -Werror=parentheses -w -c -o /dev/null c.c
$ clang -Werror=parentheses -w -c -o /dev/null c.c
c.c:3:9: error: using the result of an assignment as a condition without
parentheses [-Werror,-Wparentheses]
if (x = 1) {}
~~^~~
c.c:3:9: note: place parentheses around the assignment to silence this
warning
if (x = 1) {}
^
( )
c.c:3:9: note: use '==' to turn this assignment into an equality comparison
if (x = 1) {}
^
==
1 error generated.
This is already a FIXME in DiagnosticIDs.cpp
(https://llvm.org/viewvc/llvm-project/cfe/trunk/lib/Basic/DiagnosticIDs.cpp?revision=331834&view=markup#l460).
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