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[Qemu-ppc] [PATCH v4 3/3] configure: Force the C standard to gnu99
From: |
Thomas Huth |
Subject: |
[Qemu-ppc] [PATCH v4 3/3] configure: Force the C standard to gnu99 |
Date: |
Thu, 10 Jan 2019 10:15:36 +0100 |
Different versions of GCC and Clang use different versions of the C standard.
This repeatedly caused problems already, e.g. with duplicated typedefs:
https://lists.gnu.org/archive/html/qemu-devel/2018-11/msg05829.html
or with for-loop variable initializers:
https://lists.gnu.org/archive/html/qemu-devel/2019-01/msg00237.html
To avoid these problems, we should enforce the C language version to the
same level for all compilers. Since our minimum compiler versions is
GCC v4.8, our best option is "gnu99" for C code right now ("gnu17" is not
available there yet, and "gnu11" is marked as "experimental"), and "gnu++98"
for the few C++ code that we have in the repository.
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
Reviewed-by: Richard Henderson <address@hidden>
Signed-off-by: Thomas Huth <address@hidden>
---
configure | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/configure b/configure
index 8049b71..f4078f6 100755
--- a/configure
+++ b/configure
@@ -107,6 +107,9 @@ update_cxxflags() {
-Wstrict-prototypes|-Wmissing-prototypes|-Wnested-externs|\
-Wold-style-declaration|-Wold-style-definition|-Wredundant-decls)
;;
+ -std=gnu99)
+ QEMU_CXXFLAGS=${QEMU_CXXFLAGS:+$QEMU_CXXFLAGS }"-std=gnu++98"
+ ;;
*)
QEMU_CXXFLAGS=${QEMU_CXXFLAGS:+$QEMU_CXXFLAGS }$arg
;;
@@ -585,7 +588,7 @@ ARFLAGS="${ARFLAGS-rv}"
# left shift of signed integers is well defined and has the expected
# 2s-complement style results. (Both clang and gcc agree that it
# provides these semantics.)
-QEMU_CFLAGS="-fno-strict-aliasing -fno-common -fwrapv $QEMU_CFLAGS"
+QEMU_CFLAGS="-fno-strict-aliasing -fno-common -fwrapv -std=gnu99 $QEMU_CFLAGS"
QEMU_CFLAGS="-Wall -Wundef -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE
$QEMU_CFLAGS"
--
1.8.3.1
- [Qemu-ppc] [PATCH v4 1/3] ppc: Move spapr-related prototypes from xics.h into a seperate header file, (continued)
[Qemu-ppc] [PATCH v4 3/3] configure: Force the C standard to gnu99,
Thomas Huth <=