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authorPeter Maydell <peter.maydell@linaro.org>2014-02-25 18:27:49 +0000
committerPeter Maydell <peter.maydell@linaro.org>2014-03-06 19:59:09 +0000
commit9c83ffd859a13d840aa3f983833b6ea1e34de483 (patch)
tree3f27473dff48bd09e2d179692cd587fcf1eadc5e /qtest.c
parentf55ea6297cc0224fe4934b90ff5343b620b14669 (diff)
downloadqemu-9c83ffd859a13d840aa3f983833b6ea1e34de483.tar.gz
configure: Make C++ test work with --enable-werror
gcc's C++ compiler complains about being passed some -W options which make sense for C but not for C++. This means we mustn't try a C++ compile with QEMU_CFLAGS, but only with a filtered version that removes the offending options. This filtering was already being done for uses of C++ in the build itself, but was omitted for the "does C++ work?" configure test. This only showed up when doing builds which explicitly enabled -Werror with --enable-werror, because the "do the compilers work" tests were mistakenly placed above the "default werror based on whether compiling from git" code. Another error in this category is that clang warns if you ask it to compile C++ code from a file named "foo.c". Further, because we were running do_cc in a subshell in the condition part of an "if", the error_exit inside do_compiler wouldn't terminate configure and we would plunge on regardless. Fix this complex of errors: 1. Move the default-werror code up so that there are no invocations of compile_object and friends between it and the point where we set $werror explicitly based on the --enable-werror command line option. 2. Provide a mechanism for filtering QEMU_CFLAGS to create QEMU_CXXFLAGS, and use it for the test we run here. 3. Provide a do_cxx function to run a test with the C++ compiler rather than doing cute tricks with subshells and do_cc. 4. Use a new temporary file TMPCXX for the C++ program fragment. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1393352869-22257-1-git-send-email-peter.maydell@linaro.org Tested-by: Andreas Färber <afaerber@suse.de>
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