gcc-clang-compatibility: Test that gcc compiled objs can be linked with

clang and viceversa.

gcc-clang-compatibility/hello.cpp

@@ -0,0 +1,6 @@
+#include <iostream>
+
+int main(){
+    std::cout << "Hello world!\n";
+    return 0;
+}

gcc-clang-compatibility/main.fmf

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+summary: Test that both gcc/clang compile/link compatibility.
+description:
+  Build an object file with g++, link it with clang++ and viceversa, to ensure
+  that objects compiled with one can be linked with the other.
+test: "$WITH_SCL ./test.sh"
+framework: shell
+tier: 1
+component:
+  - llvm-toolset
+  - clang
+extra-summary: /tools/clang/gcc-clang-compatibility
+extra-task: /tools/clang/gcc-clang-compatibility
+
+require:
+  - gcc-c++
+
+adjust:
+  - require+:
+      - clang
+    when: collection is not defined
+
+  # Requirements for SCL-ized LLVM
+  - require+:
+      - llvm-toolset-13.0-clang
+    when: "collection == llvm-toolset-13.0"
+  - require+:
+      - llvm-toolset-14.0-clang
+    when: "collection == llvm-toolset-14.0"
+  - require+:
+      - llvm-toolset-15.0-clang
+    when: "collection == llvm-toolset-15.0"

gcc-clang-compatibility/test.sh

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+#!/bin/sh -eux
+
+tmp=$(mktemp -d)
+
+# Build the source with GCC, link it with clang
+g++ -c hello.cpp -o ${tmp}/hello.o
+clang++ -o ${tmp}/hello ${tmp}/hello.o
+${tmp}/hello | grep "Hello world"
+rm -rf ${tmp}/*
+
+# Build the source with clang, link it with GCC
+clang++ -c hello.cpp -o ${tmp}/hello.o
+g++ -o ${tmp}/hello ${tmp}/hello.o
+${tmp}/hello | grep "Hello world"
+rm -rf ${tmp}/*