Import gcc-fedora-flags test from redhat-rpm-config

Once this is committed, the version in redhat-rpm-config will be removed
and redhat-rpm-config will use this test.

tests/fedora-flags/hello.c

@@ -0,0 +1,5 @@
+#include <stdio.h>
+
+void hello() {
+  printf("Hello World\n");
+}

tests/fedora-flags/hello.cpp

@@ -0,0 +1,5 @@
+#include <iostream>
+
+void hello() {
+  std::cout << "Hello World\n";
+}

tests/fedora-flags/main.c

@@ -0,0 +1,6 @@
+void hello();
+
+int main(int argc, char **argv) {
+  hello();
+  return 0;
+}

tests/fedora-flags/main.cpp

@@ -0,0 +1,6 @@
+void hello();
+
+int main(int argc, char **argv) {
+  hello();
+  return 0;
+}

tests/fedora-flags/main.fmf

@@ -0,0 +1,10 @@
+summary: Test compiling with the Fedora C/CXX flags.
+description: ''
+component:
+  - gcc
+test: ./runtest.sh
+require:
+  - annobin-annocheck
+  - gcc
+  - gcc-c++
+  - redhat-rpm-config

tests/fedora-flags/runtest.sh

@@ -0,0 +1,29 @@
+#!/bin/bash
+
+set -ex
+
+default_cflags=$(rpm -E '%{build_cflags}')
+default_cxxflags=$(rpm -E '%{build_cxxflags}')
+default_ldflags=$(rpm -E '%{build_ldflags}')
+
+cflags=$(rpm -D '%toolchain gcc' -E '%{build_cflags}')
+cxxflags=$(rpm -D '%toolchain gcc' -E '%{build_cxxflags}')
+ldflags=$(rpm -D '%toolchain gcc' -E '%{build_ldflags}')
+
+test "$default_cflags" = "$cflags"
+test "$default_cxxflags" = "$cxxflags"
+test "$default_ldflags" = "$ldflags"
+
+gcc $cflags -o hello.o -c hello.c
+annocheck hello.o
+gcc $cflags -o main.o -c main.c
+gcc $ldflags -o hello main.o hello.o
+annocheck hello
+./hello | grep "Hello World"
+
+g++ $cxxflags -o hello-cpp.o -c hello.cpp
+annocheck hello-cpp.o
+g++ $cxxflags -o main-cpp.o -c main.cpp
+g++ $ldflags -o hello-cpp main-cpp.o hello-cpp.o
+annocheck hello-cpp
+./hello-cpp | grep "Hello World"