Merge pull request #48 from giordano/patch-1

Remove `USEGCC`/`USECLANG` dance in `Make.inc`

.github/workflows/CI.yml

@@ -34,4 +34,6 @@ jobs:
           version: ${{ matrix.version }}
           arch: ${{ matrix.arch }}
       - run: make -j
+        env:
+          CC: gcc
       - run: julia test.jl

Make.inc

@@ -1,4 +1,4 @@
-# -*- mode: makefile-gmake -*-
+# -*- mode: makefile -*-
 ifneq ($(OS),Windows_NT)
   OS = $(shell uname)
 endif
@@ -13,20 +13,12 @@ ifneq (,$(findstring CYGWIN,$(OS)))
 override OS := Windows_NT
 endif
 
-USEGCC = 1
-USECLANG = 0
+# Default value, can be overriden on the command line
+# or with an environment variable.
+CC ?= gcc
 
 CFLAGS-add += -Wall -O3
 
-ifeq ($(USECLANG),1)
-USEGCC = 0
-CC = clang
-endif
-
-ifeq ($(USEGCC),1)
-CC = gcc
-endif
-
 ifeq ($(OS), Linux)
 SHLIB_EXT = so
 CFLAGS-add+=-fPIC