On 10 May 2012 12:54, <ka...@karme.de> wrote: > I still can reproduce it using ccache 3.1.7-1 and gcc 4.4.7-1
Thanks! The root cause is a bug in preprocessor. Since ccache by default runs the preprocessor and then compiles its output, the error shows up when using ccache. Here's a reduced test case: % cat bug465324.c #define m(x) int x; m( #line 1 "f" x) #line 2 "f" % gcc-4.4 -E bug465324.c -o bug465324.i % cat bug465324.i # 1 "bug465324.c" # 1 "<built-in>" # 1 "<command-line>" # 1 "bug465324.c" # 1 "f" int x;# 2 "f" % gcc-4.4 bug465324.i f:1: error: stray ‘#’ in program f:1: error: expected identifier or ‘(’ before numeric constant % gcc-4.6 -E bug465324.c -o bug465324.i % cat bug465324.i # 1 "bug465324.c" # 1 "<built-in>" # 1 "<command-line>" # 1 "bug465324.c" # 1 "f" # 2 "bug465324.c" int x; # 2 "f" % gcc-4.6 -c bug465324.i && echo works works It seems to work for me with GCC >=4.5 and fails with GCC <4.5. A workaround is to set CCACHE_CPP2=1 since that avoids compiling the preprocessed output (but also makes cache misses slower). Note that this only covers the "stray ‘#’ in program" error. The original bug report mentions "stray ‘\177’ in program", which sounds like another problem. -- Joel
