# -*- mode: makefile-gmake -*-
##
## Setup tools to build project including compiler
##

# Expected inputs:
#
# HOST
# TARGET
# SUBTARGET
#
# output:
# variables:
#   CC
#   BUILD_CC
#   CCACHE
#   TOOLCHAIN
#   PERL
#   MKDIR
#   TOUCH
#   STRIP
#   INSTALL
#   CC_VERSION
#   CC_MAJOR
#   CC_MINOR
#
# macros:
#   cc_ver_ge

# Defaults for tools
PERL=perl
MKDIR=mkdir
TOUCH=touch
STRIP?=strip
INSTALL?=install
# Override this only if the host compiler is called something different
BUILD_CC := cc

# target specific tool overrides
include frontends/$(TARGET)/Makefile.tools

# CCACHE
ifeq ($(origin CCACHE),undefined)
  CCACHE=$(word 1,$(shell ccache -V 2>/dev/null))
endif
CC := $(CCACHE) $(CC)

###############################################################################
# Auto-detect the toolchain
###############################################################################

# Check for GCC first, as that's most likely
# TODO: Using shell redirection like this probably hurts portability
CC_SPECS := $(shell $(CC) -dumpspecs 2>&1)
ifeq ($(findstring libgcc,$(CC_SPECS)),libgcc)
  # Looks like GCC
  TOOLCHAIN := gcc
else
  # Not GCC, so enquire further
  ccvsn := $(shell $(CC) --version 2>&1)
  ifeq ($(ccvsn),)
    # Version string is blank
    ifeq ($(BUILD),arm-unknown-riscos)
      # For some reason we never see the output of SCL apps, so might be
      # Norcroft.  However it might also be a GCC linked against a buggy
      # UnixLib.
      # TODO: Something more useful than blindly assuming GCC.
      ccvsn := GCC
      # ccvsn := Norcroft
    endif
  endif

  ifeq ($(findstring lcc:,$(ccvsn)),lcc:)
    # MCST LCC pretends to be gcc
    TOOLCHAIN := gcc
  endif

  # "Norcroft ..."
  ifeq ($(word 1,$(ccvsn)),Norcroft)
    TOOLCHAIN := norcroft
  endif
  # "GCC ..."
  ifeq ($(word 1,$(ccvsn)),GCC)
    TOOLCHAIN := gcc
  endif
  # "clang ..."
  ifeq ($(word 1,$(ccvsn)),clang)
    TOOLCHAIN := clang
  endif
  ifeq ($(word 2,$(ccvsn)),clang)
    # Some newer clangs have distributor as first word
    # (ie, Debian, Apple, etc)
    TOOLCHAIN := clang
  endif
  ifeq ($(word 2,$(ccvsn)),LLVM)
    # Apple version is "Apple LLVM" to be differntly awkward
    TOOLCHAIN := clang
  endif
  ifeq ($(word 1,$(ccvsn)),Open64)
    TOOLCHAIN := open64
  endif
endif

ifeq ($(TOOLCHAIN),)
  $(error Unable to detect toolchain)
endif


###############################################################################
# Compiler Versioning (to adjust warning flags)
###############################################################################

CC_VERSION := $(shell $(CC) -dumpfullversion -dumpversion)
CC_MAJOR := $(word 1,$(subst ., ,$(CC_VERSION)))
CC_MINOR := $(word 2,$(subst ., ,$(CC_VERSION)))
define cc_ver_ge
$(shell expr $(CC_MAJOR) \> $(1) \| \( $(CC_MAJOR) = $(1) \& $(CC_MINOR) \>= $(2) \) )
endef