[Bug 230184] clang++ failed to include standard header files if '-stdlib=libstdc++' option is specified

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230184

            Bug ID: 230184
           Summary: clang++ failed to include standard header files if
                    '-stdlib=libstdc++' option is specified
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: yasu at utahime.org

In the OPTIONS section of clang(1) man page '-stdlib' option is
explained as following:

----------------------------------------------------------------------
-stdlib=<library>
        Specify the C++ standard library to use; supported options are
        libstdc++ and libc++. If not specified, platform default will be
        used.
----------------------------------------------------------------------

But if '-stdlib=libstdc++' is specified clang++ fails to include
standard header files such as 'iostream' or 'cstdio'.

yasu at rolling-vm-freebsd1[1724]% uname -a
FreeBSD rolling-vm-freebsd1.home.utahime.org 12.0-CURRENT FreeBSD 12.0-CURRENT
#0 r336739: Sun Jul 29 07:46:09 JST 2018    
rootz at rolling-vm-freebsd1.home.utahime.org:/usr0/freebsd/base/obj/usr0/freebsd/base/head/amd64.amd64/sys/GENERIC_UTAHIME
 amd64
yasu at rolling-vm-freebsd1[1725]% cat Makefile
CXX=            clang++
RM=             rm -f

CXXFLAGS+=      -stdlib=libstdc++

TARGETS =       cpptest01 \
                cpptest02
OBJECTS =       cpptest01.o \
                cpptest02.o

all: ${TARGETS}

cpptest01: cpptest01.o
        $(CXX) $(CXXFLAGS) -o $@ $>

cpptest02: cpptest02.o
        $(CXX) $(CXXFLAGS) -o $@ $>

clean:
        ${RM} ${TARGETS} ${OBJECTS}
yasu at rolling-vm-freebsd1[1726]% cat cpptest01.cpp
#include <iostream>

int
main(int argc, char **argv)
{
    std::cout << "Hello, World" << std::endl;
    return 0;
}
yasu at rolling-vm-freebsd1[1727]% cat cpptest02.cpp
#include <cstdio>

int
main(int argc, char **argv)
{
    std::printf("Hello, World\n");
    return 0;
}
yasu at rolling-vm-freebsd1[1728]% make -k
clang++  -O2 -pipe -stdlib=libstdc++ -c cpptest01.cpp -o cpptest01.o
cpptest01.cpp:1:10: fatal error: 'iostream' file not found
#include <iostream>
         ^~~~~~~~~~
1 error generated.
*** Error code 1 (continuing)
clang++  -O2 -pipe -stdlib=libstdc++ -c cpptest02.cpp -o cpptest02.o
cpptest02.cpp:1:10: fatal error: 'cstdio' file not found
#include <cstdio>
         ^~~~~~~~
1 error generated.
*** Error code 1 (continuing)
`all' not remade because of errors.
yasu at rolling-vm-freebsd1[1728]%

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