[kvm-unit-tests PATCH 1/4] configure: Add the possibility to specify additional cflags

[Thomas Huth <thuth@redhat.com>]

For certain compilers or experiments, it might be necessary to
specify additional CFLAGS for the build. Let's add an option to
the configure script to specify such additional compiler flags.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 Makefile  |  3 ---
 configure | 10 ++++++++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/Makefile b/Makefile
index 1afa90e..f7b9f28 100644
--- a/Makefile
+++ b/Makefile
@@ -22,9 +22,6 @@ DESTDIR := $(PREFIX)/share/kvm-unit-tests/
 cc-option = $(shell if $(CC) -Werror $(1) -S -o /dev/null -xc /dev/null \
               > /dev/null 2>&1; then echo "$(1)"; else echo "$(2)"; fi ;)
 
-#make sure env CFLAGS variable is not used
-CFLAGS =
-
 libcflat := lib/libcflat.a
 cflatobjs := \
 	lib/argv.o \
diff --git a/configure b/configure
index d21601f..c48ab3d 100755
--- a/configure
+++ b/configure
@@ -8,6 +8,7 @@ fi
 srcdir=$(cd "$(dirname "$0")"; pwd)
 prefix=/usr/local
 cc=gcc
+cflags=
 ld=ld
 objcopy=objcopy
 objdump=objdump
@@ -38,8 +39,9 @@ usage() {
 	    --target=TARGET        target platform that the tests will be running on (qemu or
 	                           kvmtool, default is qemu) (arm/arm64 only)
 	    --cross-prefix=PREFIX  cross compiler prefix
-	    --cc=CC		   c compiler to use ($cc)
-	    --ld=LD		   ld linker to use ($ld)
+	    --cc=CC                c compiler to use ($cc)
+	    --cflags=FLAGS         extra options to be passed to the c compiler
+	    --ld=LD                ld linker to use ($ld)
 	    --prefix=PREFIX        where to install things ($prefix)
 	    --endian=ENDIAN        endianness to compile for (little or big, ppc64 only)
 	    --[enable|disable]-pretty-print-stacks
@@ -100,6 +102,9 @@ while [[ "$1" = -* ]]; do
 	--cc)
 	    cc="$arg"
 	    ;;
+	--cflags)
+	    cflags="$arg"
+	    ;;
 	--ld)
 	    ld="$arg"
 	    ;;
@@ -316,6 +321,7 @@ ARCH=$arch
 ARCH_NAME=$arch_name
 PROCESSOR=$processor
 CC=$cross_prefix$cc
+CFLAGS=$cflags
 LD=$cross_prefix$ld
 OBJCOPY=$cross_prefix$objcopy
 OBJDUMP=$cross_prefix$objdump
-- 
2.27.0