"make check" on binutils checks if assembler is OK. But ccache gave me old relocatable files generated for "make check" instead of calling the new assembler to compile new ones since the source codes of binutils testcases aren't changed. How can I turn off ccache?
I think ccache should recompile if compiler, assembler and sources are changed.
AFAIK, ccache records the compilation command line (compiler, options) as well as looks at the referenced source files when determining whether to use a cached result or not. If the target compiler does something internally that may result in differences between different runs (which I gather is the case here, the assembler executable or something changed), I don't think ccache has any chance to detect that. Anyway, I think this would be better discussed upstream with the ccache developers - I don't think there's anything wrong packaging-wise here so I'm inclined to close this as UPSTREAM or CANTFIX here in Bugzilla. Opinions? ccache upstream contact info is at http://ccache.samba.org/ You can disable ccache by setting the CCACHE_DISABLE environment variable, see ccache manual page as well as /etc/profile.d/ccache.*sh
Gcc uses assembler to generate .o files. You can use "gcc --print-prog-name=as" to find out where the assembler is and check if the assembler is changed between runs. For [hjl@gnu-6 binutils-lrb]$ gcc --print-prog-name=as as [hjl@gnu-6 binutils-lrb]$ you need to search $PATH to find the assembler. For [hjl@gnu-6 binutils-lrb]$ gcc --print-prog-name=as -B/usr/bin/ /usr/bin/as [hjl@gnu-6 binutils-lrb]$ You can just check the assembler directly. It shouldn't be that hard to fix it.
Wouldn't that require running eg. "gcc --print-prog-name=as" before every single gcc invocation? And even then, it would only possibly help for "as", and not for any other external executables the compiler may invoke internally. I still think this is something that should be taken upstream. See also the "HOW IT WORKS" section of the man page.
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