From cd44c0af71ace2eb8056c2b26b9249a5aa102b41 Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Thu, 18 Feb 2021 19:22:37 +0100
Subject: [PATCH] Increase default stack size on Linux

Workaround for #4550.
---
 src/nix/main.cc | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/src/nix/main.cc b/src/nix/main.cc
index 5f4eb8918..1b68cf15b 100644
--- a/src/nix/main.cc
+++ b/src/nix/main.cc
@@ -17,6 +17,10 @@
 #include <netdb.h>
 #include <netinet/in.h>
 
+#if __linux__
+#include <sys/resource.h>
+#endif
+
 #include <nlohmann/json.hpp>
 
 extern std::string chrootHelperName;
@@ -325,6 +329,17 @@ void mainWrapped(int argc, char * * argv)
 
 int main(int argc, char * * argv)
 {
+    // Increase the default stack size for the evaluator and for
+    // libstdc++'s std::regex.
+    #if __linux__
+    rlim_t stackSize = 64 * 1024 * 1024;
+    struct rlimit limit;
+    if (getrlimit(RLIMIT_STACK, &limit) == 0 && limit.rlim_cur < stackSize) {
+        limit.rlim_cur = stackSize;
+        setrlimit(RLIMIT_STACK, &limit);
+    }
+    #endif
+
     return nix::handleExceptions(argv[0], [&]() {
         nix::mainWrapped(argc, argv);
     });