From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Date: Thu, 25 Apr 2013 15:31:28 +0200 Subject: [Buildroot] buildroot still compiles C++ code when C++ compiler is unavailable In-Reply-To: References: Message-ID: <20130425153128.71c7c44f@skate> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Dear Adam Nielsen, On Thu, 25 Apr 2013 14:46:05 +1000, Adam Nielsen wrote: > After a successful build and changing some settings, I'm struggling > to get a second successful build. I had to select a newer version of > GCC to avoid some segfaults, but now when compiling I get these > errors: > > checking whether to build shared libraries... yes > checking whether to build static libraries... yes > checking how to run the C++ preprocessor... /lib/cpp > configure: error: in > `buildroot/build/gettext-0.18.2.1/gettext-runtime/libasprintf': > configure: error: C++ preprocessor "/lib/cpp" fails sanity check > See `config.log' for more details > configure: error: ./configure failed for libasprintf > configure: error: ./configure failed for gettext-runtime > > According to Google it's because I don't have a C++ compiler > installed, which is correct, I had originally compiled it, but then I > deselected it in the buildroot config as the library was too big to > fit in my device's flash memory. > > I was assuming buildroot would now omit those packages that require > C++, but it looks like I am wrong. Is there an easy way to find out > which packages depend on C++ and tell buildroot not to build them, > now I have deselected C++ support? All packages that depend on C++ have the 'depends on BR2_INSTALL_LIBSTDCPP' dependency, so they are not selectable when C++ is not available. However, did you do a complete 'make clean; make' cycle after disabling C++ support? Buildroot doesn't track the configuration changes you're making, so when you make a change as big in consequences as disabling C++, you should do a complete rebuild. Best regards, Thomas -- Thomas Petazzoni, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com