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up vote 59 down vote favorite 9 I recently had a class project where I had to make a program with G++. for static libraries, etc.) esp8266: how to force library functions info ROM? share|improve this answer answered Sep 29 at 16:45 tgibson 211 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up All directories named by -isystem are searched after all directories named by -I, no matter what their order was on the command line.

Not the answer you're looking for? C++ 1> [ 67%] Generating opencv_test_videoio_pch_dephelp.cxx 1> Scanning dependencies of target opencv_test_videoio_pch_dephelp 1> [ 67%] Building CXX object modules/videoio/CMakeFiles/opencv_test_videoio_pch_dephelp.dir/opencv_test_videoio_pch_dephelp.cxx.o 1> [ 68%] Linking CXX static library ../../lib/libopencv_test_videoio_pch_dephelp.a 1> [ 68%] Built Reload to refresh your session. Reload to refresh your session.

Note that I am building a native compiler that runs on another > host that the one building it (is that also canadian cross compilation no ?) so > -I\${includedir} should Why (in universe) are blade runners called blade runners? Search for: Archives September 2016 August 2016 July 2016 July 2015 May 2015 April 2015 March 2015 March 2014 September 2013 August 2013 February 2013 December 2012 July 2012 June 2012 Or it requires special configuration options.

We recommend upgrading to the latest Safari, Google Chrome, or Firefox. Comment 38 Andrew Pinski 2010-08-10 22:19:02 UTC (In reply to comment #37) > Thus, does adding -nostdinc++ to the PCHs flags work for you? Because it seems an hack to me. Comment 61 Andrew Pinski 2016-07-31 10:08:01 UTC No response in 6 months so closing Format For Printing -XML -Clone This Bug -Top of page Home | New | Browse | Search

About the driver, really I have no idea. current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. See for instructions. Comment 7 Paolo Bonzini 2009-08-07 10:45:19 UTC What's the content of gcc/fenv.h in the build directory?

Something like this: /mnt/clfs/cross-tools/usr/bin/x86_64-unknown-linux-gnu-c++ -x c++-header -g -O2 -D_GNU_SOURCE -I/mnt/clfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include/x86_64-unknown-linux-gnu -I/mnt/clfs/sources/gcc-build/x86_64-unknown-linux-gnu/libstdc++-v3/include -I/mnt/clfs/sources/gcc-4.4.1/libstdc++-v3/libsupc++ -O2 -g /mnt/clfs/sources/gcc-4.4.1/libstdc++-v3/include/precompiled/stdtr1c++.h -E | grep -i fenv libstdc++-v3/acinclude.m4 has this code: # For Canadian crosses, pick this up Personal Open source Business Explore Sign up Sign in Pricing Blog Support Search GitHub This repository Watch 1,282 Star 11,586 Fork 9,451 opencv/opencv Code Issues 966 Pull requests 44 Projects Comment 1 Paolo Carlini 2009-08-05 22:26:04 UTC You should try to figure out the reason of those errors: whether, for some reason, _GLIBCXX_HAVE_FENV_H is undefined, thus is not included in Comment 35 Paolo Carlini 2010-08-02 06:53:04 UTC Thanks a lot Armand (by the way, many thanks to Ralf too) Comment 36 Andrew Pinski 2010-08-10 21:51:42 UTC I am running into this

Already have an account? Sometimes the *.h.gch will get corrupted or contain outdated information, so deleting that file and compiling it again should fix it. CLFS_TARGET is x86_64-unknown-linux-gnu. Comment 20 Ralf Wildenhues 2009-12-22 21:04:26 UTC Created attachment 19374 [details] patch to turn off multiple inclusion guard for fenv.h C++ wrapper Comment #18 confirms #13.

Comment 21 armand.potter 2010-01-10 11:27:58 UTC Build succeeds with the patch. Because it seems an hack to me. If it succeeds, bonus points for also installing the just-built compiler and then trying to do another cross build using the just-installed compiler. Comment 45 Paolo Carlini 2010-09-02 09:42:24 UTC Paolo (Bonzini), Ralf, I'm going to add -nostdinc++ to PCHFLAGS in include/Makefile.am.

Like said in comment #28, it may break if used cross-compiler is incompatible with in-tree c++ headers (can gcc be built that way ?) 2/ Do not use in-tree headers when A (hacky) solution I came up with is this: --- opencv-2.4.12.3/cmake/OpenCVPCHSupport.cmake +++ opencv-2.4.12.3-patched/cmake/OpenCVPCHSupport.cmake @@ -24,7 +24,7 @@ ENDIF() SET(_PCH_include_prefix "-I") - SET(_PCH_isystem_prefix "-isystem") + SET(_PCH_isystem_prefix "-I") SET(_PCH_define_prefix "-D") ELSEIF(CMAKE_GENERATOR MATCHES "^Visual.*$") So could you check which gcc or g++ compiler is installed on your system? It looks like the -I for system includes is not applied everywhere (A grep for -isystem still finds some occurences but not as many as without the workaround.

I did some investigations and the problem is that fenv.h file from build tree is first included (and defines _GLIBCXX_FENV_H to 1) and then include_next includes fenv.h from host (installed in CLFS_TARGET is > x86_64-unknown-linux-gnu. > Please show me how CLFS_CROSS_TOOLS gcc and binutils are configured. How should I deal with a difficult group and a DM that doesn't help? However, I'm told it is not very much used.

Or, the configure test for the facilities in (generated from acinclude.m4) wrongly defines _GLIBCXX_USE_C99_FENV_TR1. I also tried to --disable-c99 for both the cross-compiler and the target compiler, but the problem is still there. Make appears to try to figure out how to produce this gcc.make and somehow that triggers the early generation of the precompiled headers. Oh, I don't think it's the only possible fix, it's merely the only patch I came up with.

modules/core/CMakeFiles/pch_Generate_opencv_core.dir/build.make:62: fallo en las instrucciones para el objetivo 'modules/core/precomp.hpp.gch/opencv_core_Release.gch' make[2]: *** [modules/core/precomp.hpp.gch/opencv_core_Release.gch] Error 1 CMakeFiles/Makefile2:862: fallo en las instrucciones para el objetivo 'modules/core/CMakeFiles/pch_Generate_opencv_core.dir/all' make[1]: *** [modules/core/CMakeFiles/pch_Generate_opencv_core.dir/all] Error 2 Makefile:160: fallo en Comment 23 Paolo Carlini 2010-01-10 12:17:55 UTC I don't know what you mean exactly by "official", but certainly disabling the build of the PCHs cannot hurt and cannot create any problem, Still, a cross with host == target seems very unusual to me, and it's the first time I hear of cross-lfs, it may well be possible that the build system is Comment 60 Jonathan Wakely 2016-01-12 17:11:59 UTC Is anyone still seeing this with 4.9.3 or later?

I must also say, not being an expert of cross-compilation, I have no idea what are you trying to do, why you actually need a cross-compiler, if you are targeting your Test should be on host (cross_host seems to be deprecated). I suspect you are doing something wrong in the setup for cross-compilation. Note that I am building a native compiler that runs on another host that the one building it (is that also canadian cross compilation no ?) so -I\${includedir} should be included.

Comment 48 paolo@gcc.gnu.org 2010-09-02 14:13:30 UTC Subject: Bug 40974 Author: paolo Date: Thu Sep 2 14:13:00 2010 New Revision: 163777 URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=163777 Log: 2010-09-02 Paolo Carlini PR libstdc++/40974 * include/Makefile.am: Also OpenCV may use some 3rdparty library which INCLUDE_DIR is /usr/include/ and put it into include directories list for compiler. Testing that right now. Show Erik Joelsson added a comment - 2016-06-14 14:43 This no longer applies to jdk 9 with the new hotspot build.

For some reason, for the build of the PCHs the wrong one is picked. Comment 54 vde 2013-02-18 05:09:33 UTC same issue trying to compile gcc 4.7.2 for mips - by openWRT toolchain for AR-71XXX mips-openwrt-linux-uclibc-c++ -x c++-header -nostdinc++ -g -Os -I/opt/open-WRT/trunk/build_dir/target-mips_r2_uClibc-0.9.33.2/gcc-linaro-4.7-2012.12/mips-openwrt-linux-uclibc/libstdc++-v3/include/mips-openwrt-linux-uclibc -I/opt/open-WRT/trunk/build_dir/target-mips_r2_uClibc-0.9.33.2/gcc-linaro-4.7-2012.12/mips-openwrt-linux-uclibc/libstdc++-v3/include -I/opt/open-WRT/trunk/build_dir/target-mips_r2_uClibc-0.9.33.2/gcc-linaro-4.7-2012.12/libstdc++-v3/libsupc++ -O2 SSH - Cannot connect: Passphrase Required… cc: error: ProvideDirectories: No such file or directory VisualGDB with Windows 10 (Anniversary Update) Linux support Undefined reference to function / Cannot detect target name I'm adding people more knowledgeable than me of configure issues in CC (maybe my friend Paolo, in particular, can help picking the best person?!?) Comment 5 Paolo Bonzini 2009-08-07 09:46:46 UTC

I don't think there is risk of regressions, but I'm not very familiar with where PCH is used.