Hello!
I have recently noticed that the Windows command line parsing routine of Cygwin
programs does not
work correctly when an escaped quotation mark is included. This is relevant
when launching a Cygwin-
based GCC through Windows CMake-generated Ninja files. We are passing
preprocessor definitions
containing quotation marks to GCC and CMake wants to pass them
backslash-escaped, but unquoted, on
the command line.
A test program I have written to inspect this issue:
#include <stdio.h>
int main(int argc, char** argv) {
for (int i = 0; i < argc; ++i) puts(argv[i]);
}
Running it (via cmd.exe):
>echo.exe a b\"c\" d
echo
a
b\c" d
The first escape sequence is ignored, but the quote is read and causes the
parser to switch to
quoted argument mode where it recognizes the remaining escaped quotes as it
already should have done
in regular parsing mode. It then proceeds to eat the remaining command line as
there aren't any
unescaped quotation marks, usually leading GCC to complain about no input files
being given.
Running the Windows-native version of the program:
>echo-win32.exe a b\"c\" d
echo-win32.exe
a
b"c"
d
This should be the expected output. Is the way the escaped quotation mark is
treated intended
behavior? I cannot really see how it would be, given that the parser is only
used for command lines
stemming from being launched by Windows-native programs.
Best regards
Oliver Old
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