https://bugs.llvm.org/show_bug.cgi?id=36758
Bug ID: 36758
Summary: #pragma GCC warning … with -Werror not treated as
error
Product: clang
Version: 6.0
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: -New Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: cl...@evan.coeusgroup.com
CC: llvm-bugs@lists.llvm.org
Clang seems to support `#pragma GCC warning …` (see
<https://gcc.gnu.org/onlinedocs/cpp/Pragmas.html#Pragmas>), but the messages
are *always* treated as warnings, even when -Werror is provided.
AFAICT `#pragma GCC warning …` is treated as an alias for `#pragma message …`
(the warning which is emitted says it's -W#pragma-messages). It should be
treated more like #warning.
Test case is simple:
$ cat warn.c
#pragma GCC warning "Hello"
$ clang -Werror -c -o warn.o warn.c && echo "I shouldn't be printed"
warn.c:1:13: warning: Hello [-W#pragma-messages]
#pragma GCC warning "Hello"
^
1 warning generated.
I shouldn't be printed
GCC works as expected:
$ gcc -Werror -c -o warn.o warn.c && echo "I shouldn't be printed"
warn.c:1:21: error: Hello [-Werror]
#pragma GCC warning "Hello"
^~~~~~~
cc1: all warnings being treated as errors
As does ICC:
icc -Werror -c -o warn.o warn.c && echo "I shouldn't be printed"
warn.c(1): error #1028: unknown warning specifier
#pragma GCC warning "Hello"
^
compilation aborted for warn.c (code 2)
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