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#include "LanguageSettings.h"
#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <numeric>
#include <stdexcept>
#include <string>
#include <vector>
#include <fmt/format.h>
#include <libreichwein/stringhelper.h>
#include "env.h"
#include "file.h"
namespace fs = std::filesystem;
using namespace std::string_literals;
LanguageSettings::LanguageSettings():
// C++
CXX{env_value("CXX")},
CXXFLAGS{env_value("CXXFLAGS")},
LDFLAGS{env_value("LDFLAGS")},
LDLIBS{env_value("LDLIBS")},
LIBS{env_value("LIBS")},
// C
// CFLAGS
AR{env_value("AR")}
{
std::string _default_compiler(find_executable({"g++", "clang++"}));
if (_default_compiler.empty()) {
throw std::runtime_error("No default C++ compiler found.");
}
// set defaults
if (CXX.empty()) {
CXX = _default_compiler;
}
if (CXXFLAGS.empty()) {
CXXFLAGS = "-std=c++17 -Wall -O2";
}
if (AR.empty()) {
AR = "ar";
}
}
std::string LanguageSettings::getCompileCommand(const std::filesystem::path& target,
const std::filesystem::path& source,
const std::filesystem::path& build,
const std::vector<std::filesystem::path>& includepaths) const
{
std::string includes{std::accumulate(includepaths.begin(), includepaths.end(), std::string{},
[](const std::string& sum, const fs::path& p){ return sum + " -I" + p.string();})};
std::string CXXFLAGS_add{is_dynamic_lib(build) ? " -fvisibility=hidden -fPIC"s : ""s};
// compile: $(CXX) $(CXXFLAGS) -c $< -o $@
return fmt::format("{}{}{}{} -c {} -o {}",
CXX,
CXXFLAGS.empty() ? ""s : (" "s + CXXFLAGS),
CXXFLAGS_add,
includes,
source.string(),
target.string());
}
std::string LanguageSettings::getLinkCommand(const std::filesystem::path& target,
const std::vector<std::filesystem::path> &inputs,
const std::vector<std::filesystem::path>& link_libs) const
{
std::string input_string{std::accumulate(inputs.begin(), inputs.end(), std::string{},
[](const std::string& sum, const fs::path& p){ return sum + " " + p.string(); })};
if (is_static_lib(target)) {
// link: $(AR) rcs libxyz.a x.o y.o z.o
return fmt::format("{} rcs {}{}",
AR,
target.string(),
input_string);
} else if (is_executable_target(target) || is_dynamic_lib(target)) {
// dynamic link: -shared -Wl,-soname,libXXX.so.N -o libXXX.so.N.M.O
std::string LDFLAGS_add{is_dynamic_lib(target) ? fmt::format(" -shared -Wl,-soname,{}",
soname_shorter(target.string()).string()) : ""s};
std::string link_libs_string;
for (const auto& i: link_libs) {
if (is_static_lib(i.string())) {
input_string += " " + i.string();
} else if (is_dynamic_lib(i.string()) || is_dynamic_lib_link(i.string())) {
input_string += " -L" + i.parent_path().string() + " -l" + dynamic_lib_name(i);
} else { // link external dynamic lib, e.g. "fmt"
link_libs_string += " -l" + i.string();
}
}
// link: $(CXX) $(LDFLAGS) $^ $(LDLIBS) $(LIBS) -o $@
return fmt::format("{}{}{}{}{}{}{} -o {}",
CXX,
LDFLAGS.empty() ? ""s : (" "s + LDFLAGS),
LDFLAGS_add,
input_string,
LDLIBS.empty() ? ""s : (" "s + LDLIBS),
LIBS.empty() ? ""s : (" "s + LIBS),
link_libs_string,
target.string());
} else if (is_dynamic_lib_link(target)) {
// special case for dynamic libs: add links
if (inputs.size() != 1) {
throw std::runtime_error("For symlink "s + target.string() + ", can link to exactly one file, found "s + std::to_string(inputs.size()));
}
return fmt::format("ln -sf {} {}", inputs[0].filename().string(), target.string());
} else {
throw std::runtime_error("No implementation for target type: "s + target.string());
}
}
std::string LanguageSettings::getDepCommand(const std::filesystem::path& target, const std::filesystem::path &source) const
{
// g++ -MM -MF <depfile> -c <cppfile>
return fmt::format("{} -MM -MF {} -c {}", CXX, target.string(), source.string());
}
// TODO:
// variables:
// CC
// CFLAGS
// ARFLAGS
// AS
// ASFLAGS
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