Add independent flags to C or C++ files #1019
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Signed-off-by: Varphone Wong <varphone@qq.com>
…lset Signed-off-by: Varphone Wong <varphone@qq.com>
| extra_args = &self.cpp_args; | ||
| } | ||
| } | ||
| _ => {} |
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It seems that the c_flags and cpp_flags are ignored for msvc?
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MSVC has only one cl.exe and has no special parameters for C or C++, so it can be ignored.
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It doesn't have -std=c11 which is used in example?
| /// .cpp_flag("-std=c++17") | ||
| /// .compile("foo"); | ||
| /// ``` | ||
| pub fn cpp_flag(&mut self, flag: &str) -> &mut Build { |
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I think cxx_flags makes more sense.
cpp could be confused with pre-processors of C/C++ compiler.
| @@ -1633,7 +1667,7 @@ impl Build { | |||
| /// This will return a result instead of panicking; see expand() for the complete description. | |||
| pub fn try_expand(&self) -> Result<Vec<u8>, Error> { | |||
| let compiler = self.try_get_compiler()?; | |||
| let mut cmd = compiler.to_command(); | |||
| let mut cmd = compiler.to_command(None); | |||
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Hmmm I wonder if there's any C/C++ that affects the expand of C/C++ program?
I can't think of any specific to C or specific to C++, AFAIK the only way to affect that is via -D.
Maybe changing std version would affect that, I recalled that newer C standard introduces more macros.
| for flag in self.c_flags.iter() { | ||
| cmd.c_args.push((**flag).into()); | ||
| } | ||
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| for flag in self.cpp_flags.iter() { | ||
| cmd.cpp_args.push((**flag).into()); | ||
| } | ||
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I think you need to do this in get_base_compiler, there are some functions which call it directly.
This PR introduces a new feature for C/C++ flags, primarily to support the compilation of mixed C/C++ code.
Sometimes we use both C and C++ languages in a single project. However, the compilers for C and C++ are different, so we need to specify different compilers during compilation. This PR adds independent compiler flags for C and C++ files, allowing us to specify different compilers during compilation.
The main changes in this PR are as follows:
Build::c_flag()andBuild::cpp_flag()methods to add independent flags to C or C++ files.srcargument toTool::to_command()method to auto-detect c/cpp compiler by source file extension for Clang/Gnu toolset.