Date: Fri, 25 Oct 2013 11:37:48 GMT From: Harti Brandt <harti@FreeBSD.org> To: freebsd-gnats-submit@FreeBSD.org Subject: bin/183297: cannot pass -stdlib=libc++ to linker Message-ID: <201310251137.r9PBbmit077543@oldred.freebsd.org> Resent-Message-ID: <201310251140.r9PBe0X4088760@freefall.freebsd.org>
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>Number: 183297 >Category: bin >Synopsis: cannot pass -stdlib=libc++ to linker >Confidential: no >Severity: non-critical >Priority: low >Responsible: freebsd-bugs >State: open >Quarter: >Keywords: >Date-Required: >Class: sw-bug >Submitter-Id: current-users >Arrival-Date: Fri Oct 25 11:40:00 UTC 2013 >Closed-Date: >Last-Modified: >Originator: Harti Brandt >Release: 10.0-current >Organization: DLR >Environment: FreeBSD FreeBSD10 10.0-CURRENT FreeBSD 10.0-CURRENT #1 r246551M: Fri Feb 8 20:56:00 CET 2013 harti@FreeBSD10:/usr/obj/usr/svn/sys/FreeBSD10 amd64 >Description: When building a C++ program both the compiler and link are identified as /usr/bin/CC. The compiling works fine - CC seems to be able to figure out the language from the extension. When linking, however, CC refuses the -stdlib=libc++ option. Looks like it doesn't know when parsing the command line. >How-To-Repeat: CMakeLists.txt: cmake_minimum_required(VERSION 2.8) project(test CXX) add_executable(test test.cc) set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -stdlib=libc++ -std=c++11") test.cc: int main() { } Run cmake . make VERBOSE=1 and observe the warning message from the linker: CC: warning: argument unused during compilation: '-stdlib=libc++' >Fix: In analogy to Linux create a Platform/FreeBSD-CXX.cmake: if(NOT CMAKE_CXX_COMPILER_NAMES) set(CMAKE_CXX_COMPILER_NAMES c++) endif() This seems to make the default c++ compiler and linker /usr/bin/c++ and the problem disappears. >Release-Note: >Audit-Trail: >Unformatted:
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