如何使用 .gpr 项目文件和 gprbuild 进行交叉编译？

Question

我正在尝试从 Linux ( Fedora 29 )交叉编译一个以 Windows 为目标的 Ada 程序。我对编译一无所知，Gnat 项目经理文档无法帮助我这个菜鸟。我更喜欢在项目文件中使用开关，并使命令尽可能简单。我该怎么办？

我试过gprbuild -P logfilter.gpr --target=Windows导致

Error: no compiler found for language 'c', target = Windows, default runtime
Error: no compiler found for language 'ada', target = Windows, default runtime
logfilter.gpr:3:09: warning: no compiler specified for language "Ada", ignoring all its sources
logfilter.gpr:7:19: "log_filter_main.adb" is not a source of project "logfilter"
gprbuild: problems with main sources

这是我的gprconfig：

prconfig has found the following compilers on your PATH.
  Only those matching the target and the selected compilers are displayed.
   1. GNAT for Ada in /usr/bin/ version 8.3 (default runtime)
   2. GCC-ASM for Asm in /usr/bin/ version 8.3.1
   3. GCC-ASM for Asm2 in /usr/bin/ version 8.3.1
   4. GCC-ASM for Asm_Cpp in /usr/bin/ version 8.3.1
   5. LLVM for C in /usr/bin/ version 7.0.1
   6. GCC for C in /usr/bin/ version 8.3.1
   7. G++ for C++ in /usr/bin/ version 8.3.1

和我的gprconfig --show-targets：

List of targets supported by a compiler:
x86_64-redhat-linux
x86_64-unknown-linux-gnu

这是我的file.gpr：

with "../../lib/gnat/gtkada";

project LogFilter is
    for Source_Dirs use ("src");
    for Object_Dir  use "obj";
    for Exec_Dir    use "exec";
    for Main use ("log_filter_main.adb");

   package Builder is
      for Executable ("main.adb") use "Logs_Filter";
   end Builder;

   package Compiler is
      for Switches ("ada") use ("-gnat2012");
   end Compiler;

end Logfilter;

Answer 1

有一次我用 Fedora 24 做到了这一点。但这需要构建一个交叉编译器。我还有一个docker 镜像

和Fedora 软件包的补丁

我在 Fedora 上填写了一个请求，要求在交叉编译器的 Windows 中包含 ada，但他们关闭了它。但是，我无法找到错误编号。

告诉我您是否对此的新版本或使用说明感兴趣。

更新：我为 FC29 重建了十字架。你可以这样试试：

dnf copr enable reznik/ada
dnf install mingw64-gcc-gnat
dnf install gprbuild

sed -i -e 's/-pc-mingw/-w64-mingw/g' /usr/share/gprconfig/*

cat > hello.adb << EOF
with Ada.Text_IO;
procedure Hello is
begin
   Ada.Text_IO.Put_Line ("Hello");
end Hello;
EOF

cat > hello.gpr << EOF
project Hello is
   for Main use ("hello.adb");
end Hello;
EOF
gprbuild --target=x86_64-w64-mingw32 -P hello.gpr
file hello.exe

hello.exe: PE32+ executable (console) x86-64, for MS Windows

PS：链接到copr