<div dir="ltr"><div style="font-family:courier new,monospace;font-size:large" class="gmail_default">Hi Simone,</div><div style="font-family:courier new,monospace;font-size:large" class="gmail_default"><br></div><div style="font-family:courier new,monospace;font-size:large" class="gmail_default">Have you tried compiling with -save-temps and looking at the preprocessor output (.ii) ?</div><div style="font-family:courier new,monospace;font-size:large" class="gmail_default"><br></div><div style="font-family:courier new,monospace;font-size:large" class="gmail_default">Csaba</div><div class="gmail_default" style="font-family:courier new,monospace;font-size:large"><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, 7 Sep 2020 at 23:27, Simone Atzeni via cfe-dev <<a href="mailto:cfe-dev@lists.llvm.org">cfe-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal">Hi,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I built Clang using my own build of gcc-7.4.0.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">My cmake command looks like this:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">toolchain=/path/to/gcc-7.4.0/install<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">CC=${toolchain}/bin/gcc
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">CXX=${toolchain}/bin/g++
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">cmake -G "Ninja"
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">-DGCC_INSTALL_PREFIX=${toolchain}
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">-DCMAKE_CXX_LINK_FLAGS="-Wl,-rpath,${toolchain}/lib64 -L${toolchain}/lib64"
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">-DTARGET_TRIPLE=aarch64-unknown-linux-gnu
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">-DCMAKE_INSTALL_PREFIX="${install_dir}"
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">-DCMAKE_BUILD_TYPE="Release"
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">-DLLVM_ENABLE_PROJECTS="clang;compiler-rt"
<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">${src}
<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Then when I try to compile this example:<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">$ cat complex.cpp<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">#include <complex.h><u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New""><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">int main()<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">{<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New""> typedef float complex kmp_cmplx32;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">}<u></u><u></u></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I get the the error below.<u></u><u></u></p>
<p class="MsoNormal">The include paths used by clang have `complex.h`, etc. The same example in “C” compiles fine.<u></u><u></u></p>
<p class="MsoNormal">What am I missing?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks!<u></u><u></u></p>
<p class="MsoNormal">Simone<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">$ /home/sw/thirdparty/llvm-project/install/Linux_aarch64/llvm-8.0/bin/clang++ complex.cpp -v<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">clang version 8.0.1<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Target: aarch64-unknown-linux-gnu<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Thread model: posix<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">InstalledDir: /home/sw/thirdparty/llvm-project/install/Linux_aarch64/llvm-8.0/bin<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Found candidate GCC installation: /home/sw/thirdparty/llvm-project/toolchains/install/Linux_aarch64/gcc-7.4.0/lib/gcc/aarch64-unknown-linux-gnu/7.4.0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Selected GCC installation: /home/sw/thirdparty/llvm-project/toolchains/install/Linux_aarch64/gcc-7.4.0/lib/gcc/aarch64-unknown-linux-gnu/7.4.0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Candidate multilib: .;@m64<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">Selected multilib: .;@m64<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">"/home/sw/thirdparty/llvm-project/install/Linux_aarch64/llvm-8.0/bin/clang-8" -cc1 -triple aarch64-unknown-linux-gnu -emit-obj -mrelax-all -disable-free -disable-llvm-verifier -discard-value-names
-main-file-name complex.cpp -mrelocation-model static -mthread-model posix -mdisable-fp-elim -fmath-errno -masm-verbose -mconstructor-aliases -fuse-init-array -target-cpu generic -target-feature +neon -target-abi aapcs -fallow-half-arguments-and-returns -dwarf-column-info
-debugger-tuning=gdb -v -resource-dir /home/sw/thirdparty/llvm-project/install/Linux_aarch64/llvm-8.0/lib/clang/8.0.1 -internal-isystem /home/sw/thirdparty/llvm-project/toolchains/install/Linux_aarch64/gcc-7.4.0/lib/gcc/aarch64-unknown-linux-gnu/7.4.0/../../../../include/c++/7.4.0
-internal-isystem /home/sw/thirdparty/llvm-project/toolchains/install/Linux_aarch64/gcc-7.4.0/lib/gcc/aarch64-unknown-linux-gnu/7.4.0/../../../../include/c++/7.4.0/aarch64-unknown-linux-gnu -internal-isystem /home/sw/thirdparty/llvm-project/toolchains/install/Linux_aarch64/gcc-7.4.0/lib/gcc/aarch64-unknown-linux-gnu/7.4.0/../../../../include/c++/7.4.0/backward
-internal-isystem /usr/local/include -internal-isystem /home/sw/thirdparty/llvm-project/install/Linux_aarch64/llvm-8.0/lib/clang/8.0.1/include -internal-externc-isystem /usr/include/aarch64-linux-gnu -internal-externc-isystem /include -internal-externc-isystem
/usr/include -fdeprecated-macro -fdebug-compilation-dir /home/satzeni -ferror-limit 19 -fmessage-length 191 -fno-signed-char -fobjc-runtime=gcc -fcxx-exceptions -fexceptions -fdiagnostics-show-option -fcolor-diagnostics -o /tmp/complex-b60b10.o -x c++ complex.cpp
-faddrsig<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">clang -cc1 version 8.0.1 based upon LLVM 8.0.1 default target aarch64-unknown-linux-gnu<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">ignoring nonexistent directory "/include"<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">#include "..." search starts here:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">#include <...> search starts here:<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">/home/sw/thirdparty/llvm-project/toolchains/install/Linux_aarch64/gcc-7.4.0/lib/gcc/aarch64-unknown-linux-gnu/7.4.0/../../../../include/c++/7.4.0<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">/home/sw/thirdparty/llvm-project/toolchains/install/Linux_aarch64/gcc-7.4.0/lib/gcc/aarch64-unknown-linux-gnu/7.4.0/../../../../include/c++/7.4.0/aarch64-unknown-linux-gnu<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">/home/sw/thirdparty/llvm-project/toolchains/install/Linux_aarch64/gcc-7.4.0/lib/gcc/aarch64-unknown-linux-gnu/7.4.0/../../../../include/c++/7.4.0/backward<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">/usr/local/include<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">/home/sw/thirdparty/llvm-project/install/Linux_aarch64/llvm-8.0/lib/clang/8.0.1/include<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">/usr/include/aarch64-linux-gnu<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">/usr/include<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">End of search list.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">complex.cpp:5:26: error: expected ';' at end of declaration<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New""> typedef float complex kmp_cmplx32;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New""> ^<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New""> ;<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:10pt;font-family:"Courier New"">1 error generated.<u></u><u></u></span></p>
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</blockquote></div><br clear="all"><br>-- <br><div dir="ltr" class="gmail_signature">You can get very substantial performance improvements<br>by not doing the right thing. - Scott Meyers, An Effective C++11/14 Sampler<br>So if you're looking for a completely portable, 100% standards-conformant way<br>to get the wrong information: this is what you want. - Scott Meyers (C++TDaWYK)</div>