The preprocessor will report warnings when there is an unterminated ' or " in a
disabled section.
Example code that triggers two warnings:
Code begin
#if 0
This shouln"t cause a problem.
This shouln't cause a problem.
#endif
int
main()
{
return 0;
}
Code end
Output from the preprocessor:
$ cpp-4.2 -v -save-temps bug.cpp
Using built-in specs.
Target: i486-linux-gnu
Configured with: ../src/configure -v
--enable-languages=c,c++,fortran,objc,obj-c++,treelang --prefix=/usr
--enable-shared --with-system-zlib --libexecdir=/usr/lib
--without-included-gettext --enable-threads=posix --enable-nls
--with-gxx-include-dir=/usr/include/c++/4.2 --program-suffix=-4.2
--enable-clocale=gnu --enable-libstdcxx-debug --enable-mpfr
--enable-targets=all --disable-werror --enable-checking=release
--build=i486-linux-gnu --host=i486-linux-gnu --target=i486-linux-gnu
Thread model: posix
gcc version 4.2.1 20070528 (prerelease) (Ubuntu 4.2-20070528-0ubuntu2)
/usr/lib/gcc/i486-linux-gnu/4.2.1/cc1plus -E -quiet -v -D_GNU_SOURCE bug.cpp
-mtune=generic -fpch-preprocess
ignoring nonexistent directory "/usr/local/include/i486-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/i486-linux-gnu/4.2.1/../../../../i486-linux-gnu/include"
ignoring nonexistent directory "/usr/include/i486-linux-gnu"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/4.2
/usr/include/c++/4.2/i486-linux-gnu
/usr/include/c++/4.2/backward
/usr/local/include
/usr/lib/gcc/i486-linux-gnu/4.2.1/include
/usr/include
End of search list.
# 1 "bug.cpp"
# 1 ""
# 1 ""
# 1 "bug.cpp"
bug.cpp:2:12: warning: missing terminating " character
bug.cpp:3:12: warning: missing terminating ' character
int
main()
{
return 0;
}
--
Summary: Incorrect warnings in disabled code.
Product: gcc
Version: 4.2.1
Status: UNCONFIRMED
Severity: minor
Priority: P3
Component: preprocessor
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: pcmoen at gmail dot com
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32271
