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--- Begin Message ---
On 1/25/22 18:02, Stijn Tintel wrote:
GCC has an option "-std=" to set the language standard for C and C++.
Newer GCC versions sometimes switch to newer standards by default. This
has the potential to break the OpenWrt toolchain build whenever a distro
introduces a new GCC version that uses a newer dialect by default.
Let's set the default dialects used for each of the GCC versions we
support, to avoid these toolchain build failures in the future.
Shouldn't the logic be different? It is the software that is to be
compiled that is written in a certain version or versions of C or C++
language.
OpenWRT should set a default C and C++ language version and packages or
any other software compiled with the OpenWRT build should override it
when they need it.
A package might for example define that they can be compiled with
version C++11 to C++20 or require at least C++17 (and hence require a
minimum GCC version).
How does this currently work? Are packages assumed to be compilable with
the default C or C++ language version of the default (host or target)
GCC version?
Regards,
Bas.
Signed-off-by: Stijn Tintel <st...@linux-ipv6.be>
---
toolchain/gcc/common.mk | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/toolchain/gcc/common.mk b/toolchain/gcc/common.mk
index bef4fa37f8..3e31a139cd 100644
--- a/toolchain/gcc/common.mk
+++ b/toolchain/gcc/common.mk
@@ -29,14 +29,20 @@ PKG_SOURCE_URL:=@GNU/gcc/gcc-$(PKG_VERSION)
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
ifeq ($(PKG_VERSION),8.4.0)
+ C_DIALECT=-std=gnu17
+ CXX_DIALECT=-std=gnu++14
PKG_HASH:=e30a6e52d10e1f27ed55104ad233c30bd1e99cfb5ff98ab022dc941edd1b2dd4
endif
ifeq ($(PKG_VERSION),10.3.0)
+ C_DIALECT=-std=gnu17
+ CXX_DIALECT=-std=gnu++14
PKG_HASH:=64f404c1a650f27fc33da242e1f2df54952e3963a49e06e73f6940f3223ac344
endif
ifeq ($(PKG_VERSION),11.2.0)
+ C_DIALECT=-std=gnu17
+ CXX_DIALECT=-std=gnu++17
PKG_HASH:=d08edc536b54c372a1010ff6619dd274c0f1603aa49212ba20f7aa2cda36fa8b
endif
@@ -86,6 +92,8 @@ GCC_CONFIGURE:= \
CFLAGS="-O2 -fbracket-depth=512 -pipe" \
CXXFLAGS="-O2 -fbracket-depth=512 -pipe" \
) \
+ CFLAGS="$(CFLAGS) $(C_DIALECT)" \
+ CXXFLAGS="$(CXXFLAGS) $(CXX_DIALECT)" \
$(HOST_SOURCE_DIR)/configure \
--with-bugurl=$(BUGURL) \
--with-pkgversion="$(PKGVERSION)" \
--- End Message ---
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