christoph/lecture-operating-system-development
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add support to build with clang

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This commit is contained in:
Christoph Urlacher
2022-07-20 22:02:49 +02:00
parent 7a3704072b
commit 2ed5aba8c3
1 changed files with 19 additions and 1 deletions
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20
c_os/Makefile
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@ -71,9 +71,22 @@ ASM = nasm
CC ?= gcc
CXX ?= g++
# CC = clang
# CXX = clang++
# Separate these as they are not compatible with clang14
EMPTY :=
GCC = gcc
ifeq ($(CXX),$(GCC))
EXTRAFLAGS = -mmanual-endbr -mpreferred-stack-boundary=2
else
EXTRAFLAGS = $(EMPTY)
endif
# NOTE: In some cases I needed O1/O0 to allow paging/bluescreen to work (We need the ebp on the stack)
# I don't know why but right now it works with O2
CFLAGS := $(CFLAGS) -O0 -m32 -march=i486 -Wall -fno-stack-protector -nostdlib -I. -g -ffreestanding -fno-pie -fno-pic -Wno-write-strings -mno-sse -mno-sse2 -mmanual-endbr -mpreferred-stack-boundary=2
CFLAGS := $(CFLAGS) -O0 -m32 -march=i486 -Wall -fno-stack-protector -nostdlib -I. -g -ffreestanding -fno-pie -fno-pic -Wno-write-strings -mno-sse -mno-sse2 $(EXTRAFLAGS)
# I added -std=c++17 for if constexpr, but it isn't necessary for anything critical (I think?)
# -std=c++20 is needed for template concepts and optional references, but we don't have it available :(
@ -188,6 +201,11 @@ clean:
$(VERBOSE) rm -rf $(DEPDIR)
$(MAKE) -C $(BOOT) clean
# --------------------------------------------------------------------------
# 'ast' erlaubt das betrachten des generierten template codes
ast:
clang++ -Xclang -ast-print -fsyntax-only $(f) | clang-format | bat -f -l cpp -P
# --------------------------------------------------------------------------
# 'bootdisk' erzeugt zunaechst das System, falls das noch nicht geschehen ist.
# Danach wird eine Bootdiskette mit dem System erzeugt.