[PATCH 1/3] Makefile: restrict -Wpedantic and -Wno-pedantic-ms-format better

["Carlo Marcelo Arenas Belón" <carenas@gmail.com>]

6a8cbc41ba (developer: enable pedantic by default, 2021-09-03)
enables pedantic mode in as many compilers as possible to help gather
feedback on future tightening of the net, so lets do so.

-Wpedantic is missing in some really old gcc 4 versions so lets restrict
it to gcc5 and clang4 (it does work in clang3 AFAIK, but it will be
unlikely a developer will use such an old compiler anyway).

MinGW gcc is the only one which has -Wno-pedantic-ms-format, and while
that is available also in older compilers, the Windows SDK provides gcc10
so lets aim for that.  Note that in order to target the flag to only
Windows, additional changes were needed in config.mak.uname to propagate
the OS detection done there.

Signed-off-by: Carlo Marcelo Arenas Belón <carenas@gmail.com>
---
 config.mak.dev   | 6 +++++-
 config.mak.uname | 3 +++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/config.mak.dev b/config.mak.dev
index cdf043c52b..c81be62a5c 100644
--- a/config.mak.dev
+++ b/config.mak.dev
@@ -9,11 +9,15 @@ endif
 DEVELOPER_CFLAGS += -Wall
 ifeq ($(filter no-pedantic,$(DEVOPTS)),)
 DEVELOPER_CFLAGS += -pedantic
+ifneq ($(filter clang4 gcc5,$(COMPILER_FEATURES)),)
 DEVELOPER_CFLAGS += -Wpedantic
-ifneq ($(filter gcc5,$(COMPILER_FEATURES)),)
+ifneq ($(filter gcc10,$(COMPILER_FEATURES)),)
+ifeq ($(uname_S),MINGW)
 DEVELOPER_CFLAGS += -Wno-pedantic-ms-format
 endif
 endif
+endif
+endif
 DEVELOPER_CFLAGS += -Wdeclaration-after-statement
 DEVELOPER_CFLAGS += -Wformat-security
 DEVELOPER_CFLAGS += -Wold-style-definition
diff --git a/config.mak.uname b/config.mak.uname
index 76516aaa9a..aa68bbdec7 100644
--- a/config.mak.uname
+++ b/config.mak.uname
@@ -589,6 +589,7 @@ ifeq ($(uname_S),NONSTOP_KERNEL)
 	SHELL_PATH = /usr/coreutils/bin/bash
 endif
 ifneq (,$(findstring MINGW,$(uname_S)))
+	uname_S := MINGW
 	pathsep = ;
 	HAVE_ALLOCA_H = YesPlease
 	NO_PREAD = YesPlease
@@ -705,6 +706,8 @@ ifeq ($(uname_S),QNX)
 	NO_STRLCPY = YesPlease
 endif
 
+export uname_S
+
 vcxproj:
 	# Require clean work tree
 	git update-index -q --refresh && \
-- 
2.33.0.955.gee03ddbf0e