[S] Change in coreboot[main]: xcompile: Apply -Wextra with temporary exceptions to GCC

[Felix Singer (Code Review)]

Felix Singer has submitted this change. ( https://review.coreboot.org/c/coreboot/+/83347?usp=email )

(

6 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.
 )Change subject: xcompile: Apply -Wextra with temporary exceptions to GCC
......................................................................

xcompile: Apply -Wextra with temporary exceptions to GCC

In order to detect more issues in our code, make GCC more picky by
enabling -Wextra. Disable a couple of warnings turned on by -Wextra
temporarily in order to keep everything compiling and working for now.
The warnings may be enabled step by step later.

Since xcompiles applies to coreboot and libpayload, add Wextra here
instead of the top-level Makefile.mk.

Change-Id: I60915cb66581dc2c9b6807335fd0e214b45e76d6
Signed-off-by: Felix Singer 
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83347
Reviewed-by: Martin L Roth 
Reviewed-by: Elyes Haouas 
Tested-by: build bot (Jenkins) 
---
M util/xcompile/xcompile
1 file changed, 33 insertions(+), 0 deletions(-)

Approvals:
  Martin L Roth: Looks good to me, approved
  Elyes Haouas: Looks good to me, but someone else must approve
  build bot (Jenkins): Verified

Objections:
  Nico Huber: I would prefer that you didn't submit this

diff --git a/util/xcompile/xcompile b/util/xcompile/xcompile
index b3012b5..4ead648 100755
--- a/util/xcompile/xcompile
+++ b/util/xcompile/xcompile
@@ -208,6 +208,39 @@
    testcc "$GCC"      "$CFLAGS_GCC -Wcalloc-transposed-args" &&
    	CFLAGS_GCC="$CFLAGS_GCC -Wcalloc-transposed-args"

+	testcc "$GCC"      "$CFLAGS_GCC -Wno-unused-parameter" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-unused-parameter"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-sign-compare" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-sign-compare"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-empty-body" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-empty-body"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-missing-field-initializers" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-missing-field-initializers"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-override-init" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-override-init"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-ignored-qualifiers" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-ignored-qualifiers"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-shift-negative-value" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-shift-negative-value"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-unused-but-set-parameter" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-unused-but-set-parameter"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-type-limits" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-type-limits"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wno-cast-function-type" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wno-cast-function-type"
+
+	testcc "$GCC"      "$CFLAGS_GCC -Wextra" &&
+		CFLAGS_GCC="$CFLAGS_GCC -Wextra"
+
    case "$architecture" in
    x86)
    	;;