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796d26a37d
[flang] Fix ISO_Fortran_binding.h to work better with C++ code This stems from working on LANL's "dopey" project -- https://github.com/lanl/dopey. That project contains C++ code which includes the header file "ISO_Fortran_binding.h". The dopey code wraps that include with an 'extern "C"' clause since the standard (18.5.1, paragraph 1) says that the file" shall contain C structure definitions, typedef declarations, ...". But the clang++ compiler emits error messages objecting to the fact that ISO_Fortran_binding.h contains templates. This change fixes that by preceding the problematic code in ISO_Fortran_binding.h with language linkage clauses that specify that they contain C++ code rather than C code. In the accompanying test, I needed to account for the fact that some people build the compiler by doing a `make check-flang`. In this case, the clang compiler which is required by the test will not be built. Here's an example of a C++ program that shows the problem: ``` extern "C" { #include "ISO_Fortran_binding.h" } int main() { return 0; } ```
34 lines
597 B
C++
34 lines
597 B
C++
// UNSUPPORTED: system-windows
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// RUN: split-file %s %t
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// RUN: chmod +x %t/runtest.sh
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// RUN: %t/runtest.sh %t %t/cppfile.cpp %flang | FileCheck %s
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//--- cppfile.cpp
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extern "C" {
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#include "ISO_Fortran_binding.h"
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}
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#include <iostream>
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int main() {
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std::cout << "PASS\n";
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return 0;
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}
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// CHECK: PASS
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// clang-format off
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//--- runtest.sh
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#!/bin/bash
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TMPDIR=$1
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CPPFILE=$2
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FLANG=$3
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BINDIR=`dirname $FLANG`
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CPPCOMP=$BINDIR/clang++
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if [ -x $CPPCOMP ]
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then
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$CPPCOMP $CPPFILE -o $TMPDIR/a.out
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$TMPDIR/a.out # should print "PASS"
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else
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# No clang compiler, just pass by default
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echo "PASS"
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fi
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