Add Ledger support

Makefile

@@ -4,7 +4,59 @@ BUILDDIR ?= $(CURDIR)/build
 build=s
 cache=false
 
-ldflags := $(LDFLAGS)
+# process build tags
+
+LEDGER_ENABLED ?= true
+build_tags = netgo
+ifeq ($(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))
+
+build_tags += $(BUILD_TAGS)
+build_tags := $(strip $(build_tags))
+
+whitespace :=
+whitespace += $(whitespace)
+comma := ,
+build_tags_comma_sep := $(subst $(whitespace),$(comma),$(build_tags))
+
+# process linker flags
+
+ldflags = -X github.com/cosmos/cosmos-sdk/version.Name=stride \
+		  -X github.com/cosmos/cosmos-sdk/version.AppName=strided \
+		  -X github.com/cosmos/cosmos-sdk/version.Version=$(VERSION) \
+		  -X github.com/cosmos/cosmos-sdk/version.Commit=$(COMMIT) \
+		  -X "github.com/cosmos/cosmos-sdk/version.BuildTags=$(build_tags_comma_sep)"
+
+ifeq ($(LINK_STATICALLY),true)
+  ldflags += -linkmode=external -extldflags "-Wl,-z,muldefs -static"
+endif
+ldflags += $(LDFLAGS)
+ldflags := $(strip $(ldflags))
+
+BUILD_FLAGS := -tags "$(build_tags)" -ldflags '$(ldflags)'
 
 .PHONY: build
 
@@ -18,6 +70,9 @@ build:
 	mkdir -p $(BUILDDIR)/
 	go build -mod=readonly -ldflags '$(ldflags)' -trimpath -o $(BUILDDIR) ./...;
 
+install: go.sum
+		go install $(BUILD_FLAGS) ./cmd/strided
+
 clean: 
 	rm -rf $(BUILDDIR)/*