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: b...@freebsd.org
Reporter: y...@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@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
ro...@rolling-vm-freebsd1.home.utahime.org:/usr0/freebsd/base/obj/usr0/freebsd/base/head/amd64.amd64/sys/GENERIC_UTAHIME
amd64
yasu@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@rolling-vm-freebsd1[1726]% cat cpptest01.cpp
#include <iostream>
int
main(int argc, char **argv)
{
std::cout << "Hello, World" << std::endl;
return 0;
}
yasu@rolling-vm-freebsd1[1727]% cat cpptest02.cpp
#include <cstdio>
int
main(int argc, char **argv)
{
std::printf("Hello, World\n");
return 0;
}
yasu@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@rolling-vm-freebsd1[1728]%
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