Makefile: improve compiler selection

- Use "CC :=" instead of "CC ?=" to ensure the correct compiler
- Change order of condition, because of packages like "gcc-$ARCH-linux-gnu" on Fedora/RHEL
- Add fallback condition for openSUSE and others
- Use tabs

Signed-off-by: Valentin Dela <[email protected]>

Author: valdela1

Makefile

@@ -599,12 +599,15 @@ else ifeq ($(GOOS),linux)
 # CC is required for cross-compiling on Linux.
 # On Debian, Ubuntu, and related distributions, compilers are named like x86_64-linux-gnu-gcc
 # On Fedora, RHEL, and related distributions, the equivalent is x86_64-redhat-linux-gcc
-CC ?= $(shell \
-       if command -v $(call to_uname_m,$(GOARCH))-linux-gnu-gcc >/dev/null 2>&1; then \
-               echo $(call to_uname_m,$(GOARCH))-linux-gnu-gcc; \
-       elif command -v $(call to_uname_m,$(GOARCH))-redhat-linux-gcc >/dev/null 2>&1; then \
-               echo $(call to_uname_m,$(GOARCH))-redhat-linux-gcc; \
-       fi)
+# On openSUSE and as a generic fallback, we simply use gcc
+CC := $(shell \
+	if command -v $(call to_uname_m,$(GOARCH))-redhat-linux-gcc >/dev/null 2>&1; then \
+		echo $(call to_uname_m,$(GOARCH))-redhat-linux-gcc; \
+	elif command -v $(call to_uname_m,$(GOARCH))-linux-gnu-gcc >/dev/null 2>&1; then \
+		echo $(call to_uname_m,$(GOARCH))-linux-gnu-gcc; \
+	else \
+		echo gcc; \
+	fi)
 else ifeq ($(GOOS),windows)
 # artifact in zip format also provided for Windows.
 ARTIFACT_FILE_EXTENSIONS += .zip