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v/thirdparty/stdatomic/nix/cpp/gen.v

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import os
fn main() {
if os.args.len <= 1 {
eprintln('please specify a C++ compiler')
exit(1)
}
cc := os.args[1]
if os.execute('${os.quoted_path(cc)} -v').exit_code != 0 {
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eprintln('please specify a valid C++ compiler')
exit(1)
}
cc_type, cc_version, cc_os := get_cc_info(cc)
triple := '$cc_type-$cc_version-$cc_os'
println('compiler: $triple')
search_paths := get_search_paths(cc)
atomic_path := find_file(search_paths, 'atomic') or {
eprintln(err)
exit(2)
}
bitsatomicbase_path := find_file(search_paths, 'bits/atomic_base.h') or {
if cc_os == 'linux' {
eprintln(err)
exit(2)
}
'no_file' // bits/atomic_base.h is only used on linux
}
patch_atomic(os.join_path(os.dir(@FILE), 'atomic.h'), atomic_path) or {
eprintln(err)
exit(2)
}
if bitsatomicbase_path != 'no_file' {
patch_bitsatomicbase(os.join_path(os.dir(@FILE), 'bitsatomicbase.h'), bitsatomicbase_path) or {
eprintln(err)
exit(2)
}
}
println('$atomic_path:::$bitsatomicbase_path')
}
fn get_cc_info(cc string) (string, string, string) {
cc_type := if cc.contains('clang') {
'clang'
} else if cc.contains('g') {
'gcc'
} else {
eprintln('only gcc and clang are supported')
exit(1)
'none'
}
lines := os.execute('${os.quoted_path(cc)} -v').output.split('\n')
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// gcc and clang both have the same way way to say what version they have and what the host target triple is
cc_version := lines.filter(it.contains('$cc_type version '))[0].all_after('$cc_type version ').all_before('.')
cc_os := lines.filter(it.starts_with('Target: '))[0].all_after('Target: ').split('-')[2]
return cc_type, cc_version, if cc_os.contains('darwin') {
'darwin' // remove 20.6.0 from darwin20.6.0
} else {
cc_os
}
}
fn get_search_paths(cc string) []string {
result := os.execute('${os.quoted_path(cc)} -v -x c++ /dev/null').output
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lines := result.split('\n')
search_path := lines[lines.index('#include <...> search starts here:') + 1..lines.index('End of search list.')]
return search_path.map(os.real_path(it.all_before('(').trim_space()))
}
fn find_file(search_paths []string, file string) ?string {
for search_path in search_paths {
if os.exists(os.join_path(search_path, file)) {
return os.join_path(search_path, file)
}
}
return error('$file not found')
}
fn patch_atomic(outfile string, infile string) ? {
lines := os.read_file(infile) ?.split('\n')
outlines := lines.filter(!it.contains('atomic(const atomic&) = delete;'))
outtext := outlines.join('\n').replace('#include <bits/atomic_base.h>', '#include "bitsatomicbase.h"')
os.write_file(outfile, outtext) ?
}
fn patch_bitsatomicbase(outfile string, infile string) ? {
lines := os.read_file(infile) ?.split('\n')
outlines := lines.filter(!it.contains('__atomic_base(const __atomic_base&) = delete;'))
outtext := outlines.join('\n').replace('#include <bits/atomic_base.h>', '#include "bitsatomicbase.h"')
os.write_file(outfile, outtext) ?
}