From 32c0167eab25a955caa4e46a6466288db3d6a61c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Oliver=20St=C3=B6neberg?=
 <firewave@users.noreply.github.com>
Date: Tue, 16 Aug 2022 22:12:01 +0200
Subject: [PATCH] specify `-pipe` for GCC to use pipes instead of temporary
 files - greatly reduces I/O usage (#4360)

---
 Makefile                    | 2 +-
 cmake/compileroptions.cmake | 3 +++
 tools/dmake.cpp             | 2 +-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 6cae34dbb..903439e4c 100644
--- a/Makefile
+++ b/Makefile
@@ -102,7 +102,7 @@ ifndef CXXFLAGS
 endif
 
 ifeq (g++, $(findstring g++,$(CXX)))
-    override CXXFLAGS += -std=gnu++0x
+    override CXXFLAGS += -std=gnu++0x -pipe
 else ifeq (clang++, $(findstring clang++,$(CXX)))
     override CXXFLAGS += -std=c++0x
 else ifeq ($(CXX), c++)
diff --git a/cmake/compileroptions.cmake b/cmake/compileroptions.cmake
index aac8eb2ea..ddb16bd00 100644
--- a/cmake/compileroptions.cmake
+++ b/cmake/compileroptions.cmake
@@ -46,6 +46,9 @@ if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU" OR CMAKE_CXX_COMPILER_ID MATCHES "Clang
 endif()
 
 if (CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
+    # use pipes instead of temporary files - greatly reduces I/O usage
+    add_compile_options(-pipe)
+
     add_compile_options(-Woverloaded-virtual)       # when a function declaration hides virtual functions from a base class
     add_compile_options(-Wno-maybe-uninitialized)   # there are some false positives
     add_compile_options(-Wsuggest-attribute=noreturn)
diff --git a/tools/dmake.cpp b/tools/dmake.cpp
index e3932cc0f..218e5e8e6 100644
--- a/tools/dmake.cpp
+++ b/tools/dmake.cpp
@@ -374,7 +374,7 @@ int main(int argc, char **argv)
     }
 
     fout << "ifeq (g++, $(findstring g++,$(CXX)))\n"
-         << "    override CXXFLAGS += -std=gnu++0x\n"
+         << "    override CXXFLAGS += -std=gnu++0x -pipe\n"
          << "else ifeq (clang++, $(findstring clang++,$(CXX)))\n"
          << "    override CXXFLAGS += -std=c++0x\n"
          << "else ifeq ($(CXX), c++)\n"