From 2fb135e10ac1c9fe83a111c71aa88c800be2f9f4 Mon Sep 17 00:00:00 2001
From: Fangrui Song <i@maskray.me>
Date: Sun, 17 Dec 2017 12:40:21 -0800
Subject: [PATCH] Support FreeBSD

This commit fixes issue on cquery's side. Its dependencies loguru and
sparsepp should also be ported to FreeBSD:

* https://github.com/emilk/loguru/pull/46
* sysinfo(2) called by sparsepp https://github.com/greg7mdp/sparsepp/blob/master/sparsepp/spp_memory.h#L32
---
 src/{platform_linux.cc => platform_posix.cc} | 35 ++++++++++++--------
 wscript                                      | 12 +++++--
 2 files changed, 32 insertions(+), 15 deletions(-)
 rename src/{platform_linux.cc => platform_posix.cc} (94%)

diff --git a/src/platform_linux.cc b/src/platform_posix.cc
similarity index 94%
rename from src/platform_linux.cc
rename to src/platform_posix.cc
index f2d7dd9d..6be1097d 100644
--- a/src/platform_linux.cc
+++ b/src/platform_posix.cc
@@ -1,4 +1,4 @@
-#if defined(__linux__) || defined(__APPLE__)
+#if defined(__unix__) || defined(__APPLE__)
 #include "platform.h"
 
 #include "utils.h"
@@ -32,12 +32,12 @@
 #include <semaphore.h>
 #include <sys/mman.h>
 
-#ifndef __APPLE__
-#include <sys/prctl.h>
-#endif
-
-#if defined(__linux__)
-#include <malloc.h>
+#if defined(__FreeBSD__)
+# include <sys/param.h>  // MAXPATHLEN
+# include <sys/sysctl.h>  // sysctl
+#elif defined(__linux__)
+# include <malloc.h>
+# include <sys/prctl.h>
 #endif
 
 namespace {
@@ -216,11 +216,7 @@ extern "C" int _NSGetExecutablePath(char* buf,uint32_t* bufsize);
 
 // See https://stackoverflow.com/questions/143174/how-do-i-get-the-directory-that-a-program-is-running-from
 std::string GetExecutablePath() {
-#ifndef __APPLE__
-  char buffer[PATH_MAX+1] = {0};
-  readlink("/proc/self/exe", buffer, PATH_MAX);
-  return std::string(buffer);
-#else
+#ifdef __APPLE__
   uint32_t size = 0;
   _NSGetExecutablePath(nullptr, &size);
   char *buffer = new char[size];
@@ -228,6 +224,19 @@ std::string GetExecutablePath() {
   std::string result(buffer);
   delete[] buffer;
   return result;
+#elif defined(__FreeBSD__)
+  static const int name[] = {
+    CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1,
+  };
+  char path[MAXPATHLEN];
+  size_t len = sizeof(path);
+  path[0] = '\0';
+  (void)sysctl(name, 4, path, &len, NULL, 0);
+  return std::string(path);
+#else
+  char buffer[PATH_MAX] = {0};
+  readlink("/proc/self/exe", buffer, PATH_MAX);
+  return std::string(buffer);
 #endif
 }
 
@@ -256,7 +265,7 @@ bool TryMakeDirectory(const std::string& absolute_path) {
 
 void SetCurrentThreadName(const std::string& thread_name) {
   loguru::set_thread_name(thread_name.c_str());
-#ifndef __APPLE__
+#ifdef __linux__
   prctl(PR_SET_NAME, thread_name.c_str(), 0, 0, 0);
 #endif
 }
diff --git a/wscript b/wscript
index 9b93d495..e6bc2215 100644
--- a/wscript
+++ b/wscript
@@ -79,7 +79,7 @@ def options(opt):
   grp.add_option('--use-system-clang', dest='use_system_clang', default=False, action='store_true',
                  help='enable use of clang from the system')
   grp.add_option('--bundled-clang', dest='bundled_clang', default='4.0.0',
-                 help='bundled clang version, downloaded from http://releases.llvm.org/ , e.g. 4.0.0 5.0.0')
+                 help='bundled clang version, downloaded from https://releases.llvm.org/ , e.g. 4.0.0 5.0.0')
   grp.add_option('--llvm-config', dest='llvm_config', default='llvm-config',
                  help='specify path to llvm-config for automatic configuration [default: %default]')
   grp.add_option('--clang-prefix', dest='clang_prefix', default='',
@@ -178,6 +178,8 @@ def configure(ctx):
       CLANG_TARBALL_EXT = '.tar.xz'
       if sys.platform == 'darwin':
         CLANG_TARBALL_NAME = 'clang+llvm-$version-x86_64-apple-darwin'
+      elif sys.platform.startswith('freebsd'):
+        CLANG_TARBALL_NAME = 'clang+llvm-$version-amd64-unknown-freebsd10'
       elif sys.platform.startswith('linux'):
         # These executable depend on libtinfo.so.5
         CLANG_TARBALL_NAME = 'clang+llvm-$version-x86_64-linux-gnu-ubuntu-14.04'
@@ -185,7 +187,7 @@ def configure(ctx):
         CLANG_TARBALL_NAME = 'LLVM-$version-win64'
         CLANG_TARBALL_EXT = '.exe'
       else:
-        sys.stderr.write('ERROR: Unknown platform {0}\n'.format(sys.platform))
+        sys.stderr.write('ERROR: releases.llvm.org does not provide pre-built binaries for your platform {0}\n'.format(sys.platform))
         sys.exit(1)
 
     CLANG_TARBALL_NAME = string.Template(CLANG_TARBALL_NAME).substitute(version=ctx.options.bundled_clang)
@@ -227,6 +229,12 @@ def build(bld):
     lib.append('rt')
     lib.append('pthread')
     lib.append('dl')
+  elif sys.platform.startswith('freebsd'):
+    # loguru::stacktrace_as_stdstring calls backtrace_symbols
+    lib.append('execinfo')
+
+    lib.append('pthread')
+    lib.append('thr')
   elif sys.platform == 'darwin':
     lib.append('pthread')