Added ledger support (#254)

- Added build tags processing to enable ledger support

Ticket: https://linear.app/upshot/issue/ORA-1122/add-ledger-support

Makefile

@@ -10,13 +10,51 @@ ifeq (,$(VERSION))
   endif
 endif
 
+# process build tags
+LEDGER_ENABLED ?= true
+build_tags = netgo
+ifeq ($(LEDGER_ENABLED),true)
+	ifeq ($(OS),Windows_NT)
+	GCCEXE = $(shell where gcc.exe 2> NUL)
+	ifeq ($(GCCEXE),)
+		$(error gcc.exe not installed for ledger support, please install or set LEDGER_ENABLED=false)
+	else
+		build_tags += ledger
+	endif
+	else
+	UNAME_S = $(shell uname -s)
+	ifeq ($(UNAME_S),OpenBSD)
+		$(warning OpenBSD detected, disabling ledger support (https://github.com/cosmos/cosmos-sdk/issues/1988))
+	else
+		GCC = $(shell command -v gcc 2> /dev/null)
+		ifeq ($(GCC),)
+			$(error gcc not installed for ledger support, please install or set LEDGER_ENABLED=false)
+		else
+			build_tags += ledger
+		endif
+	endif
+	endif
+endif
+
+build_tags += $(BUILD_TAGS)
+build_tags := $(strip $(build_tags))
+
+whitespace :=
+whitespace += $(whitespace)
+comma := ,
+build_tags_comma_sep := $(subst $(whitespace),$(comma),$(build_tags))
+
 # Update the ldflags with the app, client & server names
 ldflags = -X github.com/cosmos/cosmos-sdk/version.Name=allora \
 	-X github.com/cosmos/cosmos-sdk/version.AppName=allorad \
 	-X github.com/cosmos/cosmos-sdk/version.Version=$(VERSION) \
-	-X github.com/cosmos/cosmos-sdk/version.Commit=$(COMMIT)
+	-X github.com/cosmos/cosmos-sdk/version.Commit=$(COMMIT) \
+	-X "github.com/cosmos/cosmos-sdk/version.BuildTags=$(build_tags_comma_sep)"
+
+ldflags += $(LDFLAGS)
+ldflags := $(strip $(ldflags))
 
-BUILD_FLAGS := -ldflags '$(ldflags)'
+BUILD_FLAGS := -tags "$(build_tags)" -ldflags '$(ldflags)'
 BUILDDIR ?= $(CURDIR)/build
 
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