On Mar 30, 2005, at 10:36 PM, Per Bothner wrote:
* Note that we compile the gch file as it were the main file - i.e. it has the MAIN_FILE_P property, and it is not included from any file.
Another side effect, it bypasses system header check.
gcc -x c-header /usr/include/stdio.h
Here, stdio.h is main input file but it is not recognized as a system header.
This means the restored line_table is slightly anomalous. One solution to this is when we generate the gch file, we pretend the .h file is included in a dummy file, which we may call <main>. This adds two line_map entries: one for <main> before the LC_ENTER of the .h file, and one at the end to LC_LEAVE the .h file. Then when we restore, we patch both of these to replace "<main>" by the real main file name.
- Devang
