Le 09/12/2019 à 21:04, Christopher Gregory via blfs-support a écrit :
>
>
>> Sent: Tuesday, December 10, 2019 at 6:15 AM
>> From: "Pierre Labastie via blfs-support"
>> <[email protected]>
>> To: [email protected]
>> Cc: "Pierre Labastie" <[email protected]>
>> Subject: Re: [blfs-support] ICU-64.2 doesn't find clang C++ compiler in
>> ./configure
>>
>> On 09/12/2019 17:31, Jared Stevens via blfs-support wrote:
>>> Hi everybody,
>>>
>>> Just thought it would make more sense to reply directly to my original
>>> thread since I am still experiencing the same issue as before.
>>>
>>> I took the aforementioned advice and followed Thomas's steps for
>>> building a multilib LFS system using his most recent 20191207 release
>>> with only one variant-- I am using systemd instead of SysvInit. So
>>> far, I have not encountered any issues with any packages in the LFS
>>> book or using the stable BLFS-9.0-systemd book.
>>>
>>> However, much like before, I installed LLVM with no build errors
>>> before moving on to try and install ICU-64.2 (and then I tried
>>> ICU-65.1 with same result). Again, I receive the exact same error
>>> message during the configure step:
>>>
>>> *checking if we have a C++ compiler... no*
>>> *configure: error: C++ compiler clang++ does not work or no compiler
>>> found*
>>>
>>> Here are the outputs of a few commands I tried to ensure clang++ was
>>> in fact installed on the system:
>>> *
>>> *
>>> *$ which clang++*
>>> */usr/bin/clang++*
>>> *
>>> *
>>> *$ ldd /usr/bin/clang++*
>>> * linux-vdso.so.1 (0x00007ffe575b4000)
>>> libpthread.so.0 => /lib/libpthread.so.0 (0x00007f91e7448000)
>>> libLLVM-8.so => /usr/bin/../lib/libLLVM-8.so (0x00007f91e439c000)
>>> libstdc++.so.6 => /usr/bin/../lib/libstdc++.so.6 (0x00007f91e41bc000)
>>> libm.so.6 => /lib/libm.so.6 (0x00007f91e4077000)
>>> libgcc_s.so.1 => /usr/bin/../lib/libgcc_s.so.1 (0x00007f91e405d000)
>>> libc.so.6 => /lib/libc.so.6 (0x00007f91e3e99000)
>>> /lib64/ld-linux-x86-64.so.2 (0x00007f91e7475000)
>>> libffi.so.7 => /usr/bin/../lib/../lib/libffi.so.7
>>> (0x00007f91e3e8a000)
>>> libz.so.1 => /lib/libz.so.1 (0x00007f91e3e6d000)
>>> librt.so.1 => /lib/librt.so.1 (0x00007f91e3e63000)
>>> libdl.so.2 => /lib/libdl.so.2 (0x00007f91e3e5e000)
>>> libncursesw.so.6 => /lib/libncursesw.so.6 (0x00007f91e3def000)
>>> libxml2.so.2 => /usr/bin/../lib/../lib/libxml2.so.2
>>> (0x00007f91e3c89000)
>>> liblzma.so.5 => /lib/liblzma.so.5 (0x00007f91e3c5f000)*
>>>
>>> I have no clue what the issue could be or if the issue is related with
>>> the build of LLVM messing up somewhere or simply with ICU.
>>>
>>> I would simply try installing ICU with the GCC compiler instead if it
>>> weren't for the fact that both 64.2 and 65.1 versions of ICU fail to
>>> detect clang++. This makes me think something messed up in LLVM.
>>>
>>> If indeed something is messed up with LLVM, I'm afraid I don't have
>>> the technical prowess to figure out what that could be since no error
>>> message is given throughout the LLVM build process from what I could see.
>>>
>>> Thanks,
>>>
>>> -- Jared
>>>
>> Have you tried something like:
>>
>> echo 'int main() { }' | clang++ -v -xc++ -
>>
>> The output may contain some clue of what is happening
>>
>> Pierre
>> --
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>>
>
> Hello,
>
> Have you tried:
>
> export CC=/usr/bin/clang
> export CXX=/usr/bin/clang++
>
> before you run ./configure ?
>
Actually, configure first tests the presence in the PATH of several C++
compilers, in this order:
clang++
g++
(intel compiler, msvc, etc)
And put the first it encounters into CXX. Then it checks that $CXX can compile
a very simple program. And, this is where it fails for Jared, according to the
error messages ("C++ compiler clang++ does not work _or_ no compiler found").
So setting CXX to clang++ is useless for icu4c. It is the other way around: if
you want to use g++, you should set CXX=g++.
Pierre
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