build: Minor build system updates

bootstrap

@@ -7,16 +7,14 @@ test -z "$srcdir" && srcdir=.
 
 cd "$srcdir"
 
-[ -d common/term ] || git clone https://github.com/limine-bootloader/terminal.git common/term
+[ -d common/term ] || git clone https://github.com/limine-bootloader/terminal.git common/term --depth=1
 [ -f common/stb/stb_image.h ] || ( curl -Lo common/stb/stb_image.h https://github.com/nothings/stb/raw/master/stb_image.h && patch -p0 < common/stb_image.patch )
 [ -f freestanding-toolchain ] || ( curl -Lo freestanding-toolchain https://github.com/mintsuki/freestanding-toolchain/raw/trunk/freestanding-toolchain && chmod +x freestanding-toolchain )
-[ -d freestanding-headers ] || git clone https://github.com/mintsuki/freestanding-headers.git
-[ -d limine-efi ] || git clone https://github.com/limine-bootloader/limine-efi.git
-[ -d libgcc-binaries ] || git clone https://github.com/mintsuki/libgcc-binaries.git
-
-automake_libdir="$(automake --print-libdir)"
+[ -d freestanding-headers ] || git clone https://github.com/mintsuki/freestanding-headers.git --depth=1
+[ -d limine-efi ] || git clone https://github.com/limine-bootloader/limine-efi.git --depth=1
+[ -d libgcc-binaries ] || git clone https://github.com/mintsuki/libgcc-binaries.git --depth=1
 
 mkdir -p build-aux
-cp "${automake_libdir}/install-sh" build-aux
+cp "$(automake --print-libdir)/install-sh" build-aux
 
-autoreconf -fvi
+autoreconf -fvi -Wall

common/GNUmakefile

@@ -62,7 +62,8 @@ override CPPFLAGS_FOR_TARGET := \
     $(CPPFLAGS_FOR_TARGET) \
     -DCOM_OUTPUT=$(COM_OUTPUT) \
     -DE9_OUTPUT=$(E9_OUTPUT) \
-    -MMD
+    -MMD \
+    -MP
 
 ifeq ($(TARGET),bios)
     override CFLAGS_FOR_TARGET += \

decompressor/GNUmakefile

@@ -43,7 +43,8 @@ override CPPFLAGS_FOR_TARGET := \
     -I./tinf \
     -I. \
     $(CPPFLAGS_FOR_TARGET) \
-    -MMD
+    -MMD \
+    -MP
 
 override LDFLAGS_FOR_TARGET += \
     -m elf_i386 \