From 849e4dc5ff0ae70fb7a0df19dbbf633e408c0f32 Mon Sep 17 00:00:00 2001
From: Artturin <Artturin@artturin.com>
Date: Sun, 15 Oct 2023 04:56:01 +0300
Subject: openjfx: respect NIX_BUILD_CORES in nested cmake
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Building `openjfx11` or `openjfx12` on a machine with many cores can consume huge amounts of RAM. With 24 cores, the memory usage exceeded `25GB` per build for me.

Using `NIX_BUILD_CORES` to reduce the number of parallel tasks doesn't help, because a script invoking `cmake` does not respect `NIX_BUILD_CORES` and passes `-j <number of cores>`.

Setting `NUMBER_OF_PROCESSORS` overrides the automatic core count detection in the script.

https://github.com/search?q=repo%3Aopenjdk%2Fjfx%20NUMBER_OF_PROCESSORS&type=code

Co-authored-by: Fabian Möller <fabianm88@gmail.com>
---
 pkgs/development/compilers/openjdk/openjfx/11.nix | 1 +
 pkgs/development/compilers/openjdk/openjfx/15.nix | 1 +
 pkgs/development/compilers/openjdk/openjfx/17.nix | 1 +
 pkgs/development/compilers/openjdk/openjfx/19.nix | 1 +
 pkgs/development/compilers/openjdk/openjfx/20.nix | 1 +
 pkgs/development/compilers/openjdk/openjfx/21.nix | 1 +
 6 files changed, 6 insertions(+)

diff --git a/pkgs/development/compilers/openjdk/openjfx/11.nix b/pkgs/development/compilers/openjdk/openjfx/11.nix
index d5ec912bfed..6d550538b08 100644
--- a/pkgs/development/compilers/openjdk/openjfx/11.nix
+++ b/pkgs/development/compilers/openjdk/openjfx/11.nix
@@ -42,6 +42,7 @@ let
     buildPhase = ''
       runHook preBuild
 
+      export NUMBER_OF_PROCESSORS=$NIX_BUILD_CORES
       export GRADLE_USER_HOME=$(mktemp -d)
       ln -s $config gradle.properties
       export NIX_CFLAGS_COMPILE="$(pkg-config --cflags glib-2.0) $NIX_CFLAGS_COMPILE"
diff --git a/pkgs/development/compilers/openjdk/openjfx/15.nix b/pkgs/development/compilers/openjdk/openjfx/15.nix
index b7ee8a02581..5ec888e49e5 100644
--- a/pkgs/development/compilers/openjdk/openjfx/15.nix
+++ b/pkgs/development/compilers/openjdk/openjfx/15.nix
@@ -47,6 +47,7 @@ let
     buildPhase = ''
       runHook preBuild
 
+      export NUMBER_OF_PROCESSORS=$NIX_BUILD_CORES
       export GRADLE_USER_HOME=$(mktemp -d)
       ln -s $config gradle.properties
       export NIX_CFLAGS_COMPILE="$(pkg-config --cflags glib-2.0) $NIX_CFLAGS_COMPILE"
diff --git a/pkgs/development/compilers/openjdk/openjfx/17.nix b/pkgs/development/compilers/openjdk/openjfx/17.nix
index a6300c38581..65d6697c6ef 100644
--- a/pkgs/development/compilers/openjdk/openjfx/17.nix
+++ b/pkgs/development/compilers/openjdk/openjfx/17.nix
@@ -49,6 +49,7 @@ let
     buildPhase = ''
       runHook preBuild
 
+      export NUMBER_OF_PROCESSORS=$NIX_BUILD_CORES
       export GRADLE_USER_HOME=$(mktemp -d)
       ln -s $config gradle.properties
       export NIX_CFLAGS_COMPILE="$(pkg-config --cflags glib-2.0) $NIX_CFLAGS_COMPILE"
diff --git a/pkgs/development/compilers/openjdk/openjfx/19.nix b/pkgs/development/compilers/openjdk/openjfx/19.nix
index bb909a31624..802a0eb9b45 100644
--- a/pkgs/development/compilers/openjdk/openjfx/19.nix
+++ b/pkgs/development/compilers/openjdk/openjfx/19.nix
@@ -51,6 +51,7 @@ let
     buildPhase = ''
       runHook preBuild
 
+      export NUMBER_OF_PROCESSORS=$NIX_BUILD_CORES
       export GRADLE_USER_HOME=$(mktemp -d)
       ln -s $config gradle.properties
       export NIX_CFLAGS_COMPILE="$(pkg-config --cflags glib-2.0) $NIX_CFLAGS_COMPILE"
diff --git a/pkgs/development/compilers/openjdk/openjfx/20.nix b/pkgs/development/compilers/openjdk/openjfx/20.nix
index 430b32187b3..d570db3b9ae 100644
--- a/pkgs/development/compilers/openjdk/openjfx/20.nix
+++ b/pkgs/development/compilers/openjdk/openjfx/20.nix
@@ -38,6 +38,7 @@ let
     buildPhase = ''
       runHook preBuild
 
+      export NUMBER_OF_PROCESSORS=$NIX_BUILD_CORES
       export GRADLE_USER_HOME=$(mktemp -d)
       ln -s $config gradle.properties
       export NIX_CFLAGS_COMPILE="$(pkg-config --cflags glib-2.0) $NIX_CFLAGS_COMPILE"
diff --git a/pkgs/development/compilers/openjdk/openjfx/21.nix b/pkgs/development/compilers/openjdk/openjfx/21.nix
index 4b178736854..2f0d83f9f25 100644
--- a/pkgs/development/compilers/openjdk/openjfx/21.nix
+++ b/pkgs/development/compilers/openjdk/openjfx/21.nix
@@ -38,6 +38,7 @@ let
     buildPhase = ''
       runHook preBuild
 
+      export NUMBER_OF_PROCESSORS=$NIX_BUILD_CORES
       export GRADLE_USER_HOME=$(mktemp -d)
       ln -s $config gradle.properties
       export NIX_CFLAGS_COMPILE="$(pkg-config --cflags glib-2.0) $NIX_CFLAGS_COMPILE"
-- 
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