http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51259
Shakthi Kannan <skannan at redhat dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |skannan at redhat dot com --- Comment #1 from Shakthi Kannan <skannan at redhat dot com> --- Opening the .c file in vim, or Emacs shows the control characters. Doing a hexdump on the output of 'gcc -E' does show the octal value in the output ('001'). For example: $ gcc -E inc.c > gcc.e $ hexdump -c gcc.e 0000000 # 1 " i n c . c " \n # 1 0000010 " < c o m m a n d - l i n e > " 0000020 \n # 1 " i n c . c " \n # 1 0000030 " a a 001 b b . h " 1 \n i n t 0000040 m a i n ( ) { } \n # 1 0000050 " i n c . c " 2 \n 000005a