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# Copyright 2013-2024 Lawrence Livermore National Security, LLC and other
# Spack Project Developers. See the top-level COPYRIGHT file for details.
#
# SPDX-License-Identifier: (Apache-2.0 OR MIT)
import os
import re
from llnl.util.filesystem import ancestor
import spack.compiler
import spack.compilers.apple_clang as apple_clang
import spack.util.executable
from spack.version import Version
class Gcc(spack.compiler.Compiler):
# Subclasses use possible names of C compiler
cc_names = ["gcc"]
# Subclasses use possible names of C++ compiler
cxx_names = ["g++"]
# Subclasses use possible names of Fortran 77 compiler
f77_names = ["gfortran"]
# Subclasses use possible names of Fortran 90 compiler
fc_names = ["gfortran"]
# MacPorts builds gcc versions with prefixes and -mp-X or -mp-X.Y suffixes.
# Homebrew and Linuxbrew may build gcc with -X, -X.Y suffixes.
# Old compatibility versions may contain XY suffixes.
suffixes = [r"-mp-\d+(?:\.\d+)?", r"-\d+(?:\.\d+)?", r"\d\d"]
# Named wrapper links within build_env_path
link_paths = {
"cc": os.path.join("gcc", "gcc"),
"cxx": os.path.join("gcc", "g++"),
"f77": os.path.join("gcc", "gfortran"),
"fc": os.path.join("gcc", "gfortran"),
}
PrgEnv = "PrgEnv-gnu"
PrgEnv_compiler = "gcc"
@property
def verbose_flag(self):
return "-v"
@property
def debug_flags(self):
return ["-g", "-gstabs+", "-gstabs", "-gxcoff+", "-gxcoff", "-gvms"]
@property
def opt_flags(self):
return ["-O", "-O0", "-O1", "-O2", "-O3", "-Os", "-Ofast", "-Og"]
@property
def openmp_flag(self):
return "-fopenmp"
@property
def cxx98_flag(self):
if self.real_version < Version("6.0"):
return ""
else:
return "-std=c++98"
@property
def cxx11_flag(self):
if self.real_version < Version("4.3"):
raise spack.compiler.UnsupportedCompilerFlag(
self, "the C++11 standard", "cxx11_flag", " < 4.3"
)
elif self.real_version < Version("4.7"):
return "-std=c++0x"
else:
return "-std=c++11"
@property
def cxx14_flag(self):
if self.real_version < Version("4.8"):
raise spack.compiler.UnsupportedCompilerFlag(
self, "the C++14 standard", "cxx14_flag", "< 4.8"
)
elif self.real_version < Version("4.9"):
return "-std=c++1y"
else:
return "-std=c++14"
@property
def cxx17_flag(self):
if self.real_version < Version("5.0"):
raise spack.compiler.UnsupportedCompilerFlag(
self, "the C++17 standard", "cxx17_flag", "< 5.0"
)
elif self.real_version < Version("6.0"):
return "-std=c++1z"
else:
return "-std=c++17"
@property
def cxx20_flag(self):
if self.real_version < Version("8.0"):
raise spack.compiler.UnsupportedCompilerFlag(
self, "the C++20 standard", "cxx20_flag", "< 8.0"
)
elif self.real_version < Version("11.0"):
return "-std=c++2a"
else:
return "-std=c++20"
@property
def cxx23_flag(self):
if self.real_version < Version("11.0"):
raise spack.compiler.UnsupportedCompilerFlag(
self, "the C++23 standard", "cxx23_flag", "< 11.0"
)
elif self.real_version < Version("14.0"):
return "-std=c++2b"
else:
return "-std=c++23"
@property
def c99_flag(self):
if self.real_version < Version("4.5"):
raise spack.compiler.UnsupportedCompilerFlag(
self, "the C99 standard", "c99_flag", "< 4.5"
)
return "-std=c99"
@property
def c11_flag(self):
if self.real_version < Version("4.7"):
raise spack.compiler.UnsupportedCompilerFlag(
self, "the C11 standard", "c11_flag", "< 4.7"
)
return "-std=c11"
@property
def cc_pic_flag(self):
return "-fPIC"
@property
def cxx_pic_flag(self):
return "-fPIC"
@property
def f77_pic_flag(self):
return "-fPIC"
@property
def fc_pic_flag(self):
return "-fPIC"
required_libs = ["libgcc", "libgfortran"]
@classmethod
def default_version(cls, cc):
"""Older versions of gcc use the ``-dumpversion`` option.
Output looks like this::
4.4.7
In GCC 7, this option was changed to only return the major
version of the compiler::
7
A new ``-dumpfullversion`` option was added that gives us
what we want::
7.2.0
"""
# Apple's gcc is actually apple clang, so skip it. Returning
# "unknown" ensures this compiler is not detected by default.
# Users can add it manually to compilers.yaml at their own risk.
if apple_clang.AppleClang.default_version(cc) != "unknown":
return "unknown"
version = super(Gcc, cls).default_version(cc)
if Version(version) >= Version("7"):
output = spack.compiler.get_compiler_version_output(cc, "-dumpfullversion")
version = cls.extract_version_from_output(output)
return version
@classmethod
def fc_version(cls, fc):
"""Older versions of gfortran use the ``-dumpversion`` option.
Output looks like this::
GNU Fortran (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18)
Copyright (C) 2010 Free Software Foundation, Inc.
or::
4.8.5
In GCC 7, this option was changed to only return the major
version of the compiler::
7
A new ``-dumpfullversion`` option was added that gives us
what we want::
7.2.0
"""
output = spack.compiler.get_compiler_version_output(fc, "-dumpversion")
match = re.search(r"(?:GNU Fortran \(GCC\) )?([\d.]+)", output)
version = match.group(match.lastindex) if match else "unknown"
if Version(version) >= Version("7"):
output = spack.compiler.get_compiler_version_output(fc, "-dumpfullversion")
version = cls.extract_version_from_output(output)
return version
@classmethod
def f77_version(cls, f77):
return cls.fc_version(f77)
@property
def stdcxx_libs(self):
return ("-lstdc++",)
@property
def prefix(self):
# GCC reports its install prefix when running ``-print-search-dirs``
# on the first line ``install: <prefix>``.
cc = spack.util.executable.Executable(self.cc)
with self.compiler_environment():
gcc_output = cc("-print-search-dirs", output=str, error=str)
for line in gcc_output.splitlines():
if line.startswith("install:"):
gcc_prefix = line.split(":")[1].strip()
# Go from <prefix>/lib/gcc/<triplet>/<version>/ to <prefix>
return ancestor(gcc_prefix, 4)
raise RuntimeError(
"could not find install prefix of GCC from output:\n\t{}".format(gcc_output)
)
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