From d90eb6e1bac78f8b04d1fa33f992a433f1f2ea36 Mon Sep 17 00:00:00 2001
From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 27 Dec 2022 17:58:08 +0200
Subject: [PATCH] Gather more system path information for GnuLinker

---
 source/gnulinker.cpp | 26 ++++++++++++++++++++++++--
 1 file changed, 24 insertions(+), 2 deletions(-)

diff --git a/source/gnulinker.cpp b/source/gnulinker.cpp
index 1931333..591c80b 100644
--- a/source/gnulinker.cpp
+++ b/source/gnulinker.cpp
@@ -1,5 +1,6 @@
 #include <stdexcept>
 #include <vector>
+#include <msp/core/algorithm.h>
 #include <msp/fs/dir.h>
 #include <msp/fs/utils.h>
 #include <msp/strings/format.h>
@@ -109,6 +110,7 @@ void GnuLinker::do_prepare(ToolData &tool) const
 	{
 		ExternalTask::Arguments argv;
 		argv.push_back(exe->get_path().str());
+		argv.push_back("-v");
 		argv.push_back("-Wl,--verbose");
 		argv.push_back("-nostdlib");
 		if(!sysroot.empty())
@@ -118,6 +120,23 @@ void GnuLinker::do_prepare(ToolData &tool) const
 		try
 		{
 			string output = ExternalTask::run_and_capture_output(argv, FS::Path(), true);
+
+			string::size_type lib_path = output.find("LIBRARY_PATH=");
+			if(lib_path!=string::npos)
+			{
+				string::size_type newline = output.find('\n', lib_path);
+				for(const string &p: split(output.substr(lib_path+13, newline-lib_path-13), ':'))
+				{
+					FS::Path path = strip(p);
+					if(!any_equals(tool.system_path, path))
+					{
+						builder.get_logger().log("tools", "Got %s frontend system path: %s", tool_tag, path);
+						tool.system_path.push_back(path);
+					}
+					path_found = true;
+				}
+			}
+
 			string::size_type start = 0;
 			while(start<output.size())
 			{
@@ -141,8 +160,11 @@ void GnuLinker::do_prepare(ToolData &tool) const
 				}
 
 				path /= output.substr(search_dir, end-search_dir);
-				builder.get_logger().log("tools", "Got %s system path: %s", tool_tag, path);
-				tool.system_path.push_back(path);
+				if(!any_equals(tool.system_path, path))
+				{
+					builder.get_logger().log("tools", "Got %s implicit system path: %s", tool_tag, path);
+					tool.system_path.push_back(path);
+				}
 				path_found = true;
 
 				start = end+3;
-- 
2.43.0