Attempt to make a working build system for linux.

build.sh

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+set +v
+
+
+CurrentDir = $PWD
+GCC-NAME = x86_64-w64-mingw
+EFI-FOLDER = gnu-efi
+
+Linker="$EFI-FOLDER/gnuefi/elf_x86_64_efi.lds"
+
+cd ./x64
+
+rm objects.list
+
+HeaderFiles=-I$CurrentDir/inc/                 \
+            -I$CurrentDir/gnu-efi/inc          \
+			-I$CurrentDir/gnu-efi/inc/x86_64   \
+			-I$CurrentDir/gnu-efi/inc/protocol \
+			-I$CurrentDir/gnu-efi/lib
+			
+			
+set -v
+for f in $CurrentDir/src/*.c; do
+	echo "$GCC-NAME-gcc" -ffreestanding -fpic -fshort-wchar -fno-stack-protector -fno-stack-check -fno-strict-aliasing -fno-merge-all-constants -m64 -mno-redzone -DGNU_USE_MS_ABI -maccumulate-outgoing-args --std=c11 $HeaderFiles -Og -g3 -Wall -Wextra -Wdouble-promotion -fmessage-length=0 -c -MMD -MP -Wa,-adhln="${f%.*}.out" -MF"${f%.*}.d" -MT"${f%.*}.o" -o "${f%.*}.o" "$f"
+	"$GCC-NAME-gcc" -ffreestanding -fpic -fshort-wchar -fno-stack-protector -fno-stack-check -fno-strict-aliasing -fno-merge-all-constants -m64 -mno-redzone -DGNU_USE_MS_ABI -maccumulate-outgoing-args --std=c11 $HeaderFiles -Og -g3 -Wall -Wextra -Wdouble-promotion -fmessage-length=0 -c -MMD -MP -Wa,-adhln="${f%.*}.out" -MF"${f%.*}.d" -MT"${f%.*}.o" -o "${f%.*}.o" "$f"
+done
+
+set +v
+
+while read f; do
+	echo "${f%.*}.o" | tee -a objects.list
+done < $CurrentDir/c_files.txt
+
+for f in $CurrentDir/src/*.o; do
+	echo "$f" | tee -a objects.list
+done
+
+set -v
+	"$GCC-NAME-ld" -T$Linker -nostdlib --warn-common --no-undefined -znocombreloc -s -shared -Bsymbolic -Map=output.map -o "program.so" @"objects.list"
+set +v
+
+rm image/efi/boot/BOOTx64.efi
+objcopy -j .text -j .sdata -j .data -j .dynamic -j .dynsym -j .rel -j .rela -j .rel.* -j .rela.* -j .rel* -j .reloc --target=efi-app-x86_64 "program.so" "image/efi/boot/BOOTx64.efi"

c_files.txt

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+gnu-efi/lib/misc.c
+gnu-efi/lib/print.c
+gnu-efi/lib/smbios.c
+gnu-efi/lib/sread.c
+gnu-efi/lib/str.c
+gnu-efi/lib/boxdraw.c
+gnu-efi/lib/cmdline.c
+gnu-efi/lib/console.c
+gnu-efi/lib/crc.c
+gnu-efi/lib/data.c
+gnu-efi/lib/debug.c
+gnu-efi/lib/dpath.c
+gnu-efi/lib/error.c
+gnu-efi/lib/event.c
+gnu-efi/lib/exit.c
+gnu-efi/lib/guid.c
+gnu-efi/lib/hand.c
+gnu-efi/lib/hw.c
+gnu-efi/lib/init.c
+gnu-efi/lib/lock.c
+gnu-efi/lib/x86_64/callwrap.c
+gnu-efi/lib/x86_64/efi_stub.S
+gnu-efi/lib/x86_64/initplat.c
+gnu-efi/lib/x86_64/math.c
+gnu-efi/lib/x86_64/setjmp.S
+gnu-efi/lib/runtime/efirtlib.c
+gnu-efi/lib/runtime/rtdata.c
+gnu-efi/lib/runtime/rtlock.c
+gnu-efi/lib/runtime/rtstr.c
+gnu-efi/lib/runtime/vm.c