From 091ef89a6d82b84e3e8fa509106444e4b5ca9c2f Mon Sep 17 00:00:00 2001
From: Francisco Javier Trujillo Mata <fjtrujy@gmail.com>
Date: Fri, 29 Nov 2024 17:02:40 +0100
Subject: [PATCH] A dummy example to show how to make binary smaller

---
 src/samples/Makefile.am                       |  1 +
 src/samples/Makefile.samples                  |  1 +
 .../libcglue/light_elf/Makefile.sample        | 16 +++++++
 src/samples/libcglue/light_elf/main.c         | 44 +++++++++++++++++++
 4 files changed, 62 insertions(+)
 create mode 100644 src/samples/libcglue/light_elf/Makefile.sample
 create mode 100644 src/samples/libcglue/light_elf/main.c

diff --git a/src/samples/Makefile.am b/src/samples/Makefile.am
index 2db7137b..e15ac84c 100644
--- a/src/samples/Makefile.am
+++ b/src/samples/Makefile.am
@@ -56,6 +56,7 @@ SAMPLES = \
 	kernel/regenum \
 	kernel/systimer \
 	kernel/sysevent \
+	libcglue/light_elf \
 	mp3 \
 	ms/callback \
 	nand/dumpipl \
diff --git a/src/samples/Makefile.samples b/src/samples/Makefile.samples
index 98215f86..5c9a4641 100644
--- a/src/samples/Makefile.samples
+++ b/src/samples/Makefile.samples
@@ -53,6 +53,7 @@ SAMPLES = \
 	kernel/regenum \
 	kernel/systimer \
 	kernel/sysevent \
+	libcglue/light_elf \
 	mp3 \
 	ms/callback \
 	nand/dumpipl \
diff --git a/src/samples/libcglue/light_elf/Makefile.sample b/src/samples/libcglue/light_elf/Makefile.sample
new file mode 100644
index 00000000..8dadeb0b
--- /dev/null
+++ b/src/samples/libcglue/light_elf/Makefile.sample
@@ -0,0 +1,16 @@
+TARGET = light_size
+OBJS = main.o
+
+INCDIR = 
+CFLAGS = -Os -Wall -fdata-sections -ffunction-sections
+CXXFLAGS = $(CFLAGS) -fno-exceptions -fno-rtti
+ASFLAGS = $(CFLAGS)
+
+LIBDIR =
+LDFLAGS = -s 
+
+EXTRA_TARGETS = EBOOT.PBP
+PSP_EBOOT_TITLE = Light Hello World
+
+PSPSDK=$(shell psp-config --pspsdk-path)
+include $(PSPSDK)/lib/build.mak
diff --git a/src/samples/libcglue/light_elf/main.c b/src/samples/libcglue/light_elf/main.c
new file mode 100644
index 00000000..c32db929
--- /dev/null
+++ b/src/samples/libcglue/light_elf/main.c
@@ -0,0 +1,44 @@
+/*
+ * PSP Software Development Kit - https://github.com/pspdev
+ * -----------------------------------------------------------------------
+ * Licensed under the BSD license, see LICENSE in PSPSDK root for details.
+ *
+ * 
+ * Sample program to demonstrate a minimalistic Hello World program.
+ * The main scope here is to show how we can disable newlib features if we don't need them.
+ */
+
+#include <stdio.h>
+
+// Specific psp headers
+#include <pspkernel.h>
+#include <pspdebug.h>
+#include <pspdisplay.h>
+#include <pspkernel.h>
+#include <pspmoduleinfo.h>
+#include <sys/socket.h>
+#include <errno.h>
+
+// We won't fully disable newlib as we are using printf
+// However we can disable timezone, pthreads, pipe and socket support
+PSP_DISABLE_NEWLIB_PIPE_SUPPORT()
+PSP_DISABLE_NEWLIB_SOCKET_SUPPORT()
+PSP_DISABLE_NEWLIB_TIMEZONE_SUPPORT()
+PSP_DISABLE_NEWLIB_CWD_SUPPORT()
+PSP_DISABLE_AUTOSTART_PTHREAD()
+ 
+// configure PSP stuff
+#define VERS    1
+#define REVS    0
+ 
+PSP_MODULE_INFO("Light Hello World", PSP_MODULE_USER, VERS, REVS);
+PSP_MAIN_THREAD_ATTR(PSP_THREAD_ATTR_USER);
+
+int main(int argc, char** argv)
+{
+    while(1) {
+        printf("Hello World!\n");
+    }
+    
+    return 0;
+}
\ No newline at end of file