build: add and use C_STANDARD in depends

depends/Makefile

@@ -45,6 +45,8 @@ MULTIPROCESS ?=
 LTO ?=
 FALLBACK_DOWNLOAD_PATH ?= https://bitcoincore.org/depends-sources
 
+C_STANDARD ?= c11
+
 BUILD = $(shell ./config.guess)
 HOST ?= $(BUILD)
 PATCHES_PATH = $(BASEDIR)/patches

depends/README.md

@@ -96,6 +96,7 @@ The following can be set when running make: `make FOO=bar`
 - `BASE_CACHE`: Built packages will be placed here
 - `SDK_PATH`: Path where SDKs can be found (used by macOS)
 - `FALLBACK_DOWNLOAD_PATH`: If a source file can't be fetched, try here before giving up
+- `C_STANDARD`: Set the C standard version used. Defaults to `c11`.
 - `NO_QT`: Don't download/build/cache Qt and its dependencies
 - `NO_QR`: Don't download/build/cache packages needed for enabling qrencode
 - `NO_ZMQ`: Don't download/build/cache packages needed for enabling ZeroMQ

depends/hosts/android.mk

@@ -6,6 +6,8 @@ android_CXX=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)$(ANDROID_API_LEVEL)-clang++
 android_CC=$(ANDROID_TOOLCHAIN_BIN)/$(HOST)$(ANDROID_API_LEVEL)-clang
 endif
 
+android_CFLAGS=-std=$(C_STANDARD)
+
 ifneq ($(LTO),)
 android_CFLAGS += -flto
 android_LDFLAGS += -flto

depends/hosts/darwin.mk

@@ -109,15 +109,15 @@ darwin_CXX=env -u C_INCLUDE_PATH -u CPLUS_INCLUDE_PATH \
                -Xclang -internal-externc-isystem$(clang_resource_dir)/include \
                -Xclang -internal-externc-isystem$(OSX_SDK)/usr/include
 
-darwin_CFLAGS=-pipe
+darwin_CFLAGS=-pipe -std=$(C_STANDARD)
+darwin_CXXFLAGS=-pipe
 
 ifneq ($(LTO),)
 darwin_CFLAGS += -flto
+darwin_CXXFLAGS += -flto
 darwin_LDFLAGS += -flto
 endif
 
-darwin_CXXFLAGS=$(darwin_CFLAGS)
-
 darwin_release_CFLAGS=-O2
 darwin_release_CXXFLAGS=$(darwin_release_CFLAGS)
 

depends/hosts/freebsd.mk

@@ -1,12 +1,12 @@
-freebsd_CFLAGS=-pipe
+freebsd_CFLAGS=-pipe -std=$(C_STANDARD)
+freebsd_CXXFLAGS=-pipe
 
 ifneq ($(LTO),)
 freebsd_CFLAGS += -flto
+freebsd_CXXFLAGS += -flto
 freebsd_LDFLAGS += -flto
 endif
 
-freebsd_CXXFLAGS=$(freebsd_CFLAGS)
-
 freebsd_release_CFLAGS=-O2
 freebsd_release_CXXFLAGS=$(freebsd_release_CFLAGS)
 

depends/hosts/linux.mk

@@ -1,12 +1,12 @@
-linux_CFLAGS=-pipe
+linux_CFLAGS=-pipe -std=$(C_STANDARD)
+linux_CXXFLAGS=-pipe
 
 ifneq ($(LTO),)
 linux_CFLAGS += -flto
+linux_CXXFLAGS += -flto
 linux_LDFLAGS += -flto
 endif
 
-linux_CXXFLAGS=$(linux_CFLAGS)
-
 linux_release_CFLAGS=-O2
 linux_release_CXXFLAGS=$(linux_release_CFLAGS)
 

depends/hosts/mingw32.mk

@@ -2,15 +2,15 @@ ifneq ($(shell $(SHELL) $(.SHELLFLAGS) "command -v $(host)-g++-posix"),)
 mingw32_CXX := $(host)-g++-posix
 endif
 
-mingw32_CFLAGS=-pipe
+mingw32_CFLAGS=-pipe -std=$(C_STANDARD)
+mingw32_CXXFLAGS=-pipe
 
 ifneq ($(LTO),)
 mingw32_CFLAGS += -flto
+mingw32_CXXFLAGS += -flto
 mingw32_LDFLAGS += -flto
 endif
 
-mingw32_CXXFLAGS=$(mingw32_CFLAGS)
-
 mingw32_release_CFLAGS=-O2
 mingw32_release_CXXFLAGS=$(mingw32_release_CFLAGS)
 

depends/hosts/netbsd.mk

@@ -1,7 +1,9 @@
-netbsd_CFLAGS=-pipe
+netbsd_CFLAGS=-pipe -std=$(C_STANDARD)
+netbsd_CXXFLAGS=-pipe
 
 ifneq ($(LTO),)
 netbsd_CFLAGS += -flto
+netbsd_CXXFLAGS += -flto
 netbsd_LDFLAGS += -flto
 endif
 

depends/hosts/openbsd.mk

@@ -1,8 +1,9 @@
-openbsd_CFLAGS=-pipe
-openbsd_CXXFLAGS=$(openbsd_CFLAGS)
+openbsd_CFLAGS=-pipe -std=$(C_STANDARD)
+openbsd_CXXFLAGS=-pipe
 
 ifneq ($(LTO),)
 openbsd_CFLAGS += -flto
+openbsd_CXXFLAGS += -flto
 openbsd_LDFLAGS += -flto
 endif
 

depends/patches/qt/mac-qmake.conf

@@ -15,7 +15,7 @@ QMAKE_MAC_SDK.macosx.SDKVersion = $${MAC_SDK_VERSION}
 QMAKE_MAC_SDK.macosx.PlatformPath = /phony
 !host_build: QMAKE_CFLAGS += -target $${MAC_TARGET}
 !host_build: QMAKE_OBJECTIVE_CFLAGS += $$QMAKE_CFLAGS
-!host_build: QMAKE_CXXFLAGS += $$QMAKE_CFLAGS
+!host_build: QMAKE_CXXFLAGS += -target $${MAC_TARGET}
 !host_build: QMAKE_LFLAGS += -target $${MAC_TARGET}
 QMAKE_AR = $${CROSS_COMPILE}ar cq
 QMAKE_RANLIB=$${CROSS_COMPILE}ranlib