[LLVMbugs] [Bug 9319] New: Clang++ ignores #pragma completely when using "diagnostic push"
bugzilla-daemon at llvm.org
bugzilla-daemon at llvm.org
Thu Feb 24 13:26:55 PST 2011
http://llvm.org/bugs/show_bug.cgi?id=9319
Summary: Clang++ ignores #pragma completely when using
"diagnostic push"
Product: clang
Version: 2.8
Platform: PC
OS/Version: Linux
Status: NEW
Severity: normal
Priority: P
Component: C++
AssignedTo: unassignedclangbugs at nondot.org
ReportedBy: nbigaouette at gmail.com
CC: llvmbugs at cs.uiuc.edu, dgregor at apple.com
Created an attachment (id=6231)
--> (http://llvm.org/bugs/attachment.cgi?id=6231)
clang++ -v -save-temps -Wunreachable-code -c src/Main.cpp -o build/Main.o &>
clang.log
I want to disable "-Wunreachable-code" for some debug output controled by a
global bool. For example:
#include <cstdlib>
#include <iostream>
// const bool verbose = true;
const bool verbose = false;
int main(int argc, char *argv[])
{
//#pragma GCC diagnostic push
//#pragma GCC diagnostic ignored "-Wunreachable-code"
if (verbose)
std::cout << "First debug output." << std::endl;
//#pragma GCC diagnostic pop
if (verbose)
std::cout << "Second debug output." << std::endl;
return EXIT_SUCCESS;
}
$ clang++ -Wunreachable-code -c src/Main.cpp -o build/Main.o
src/Main.cpp:18:9: warning: will never be executed [-Wunreachable-code]
std::cout << "First debug output." << std::endl;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
src/Main.cpp:22:9: warning: will never be executed [-Wunreachable-code]
std::cout << "Second debug output." << std::endl;
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
2 warnings generated.
Uncommenting the 'ignored "-Wunreachable-code"' pragma suppresses both
warnings. Uncommenting the push and pop pragma will bring the two warnings
back, while it should hide the first only and let the second pass.
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