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Fix build with modern host toolchains (GCC 15, CMake 4.x) #1978

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Merged
widgetii merged 1 commit into from
Apr 3, 2026
Merged

Fix build with modern host toolchains (GCC 15, CMake 4.x) #1978

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1 change: 1 addition & 0 deletions Makefile
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Original file line number Diff line number Diff line change
Expand Up @@ -4,6 +4,7 @@ BR_LINK = https://github.com/buildroot/buildroot/archive
BR_FILE = /tmp/buildroot-$(BR_VER).tar.gz
BR_CONF = $(TARGET)/openipc_defconfig
TARGET ?= $(PWD)/output
export CMAKE_POLICY_VERSION_MINIMUM := 3.5

CONFIG = $(error variable BOARD not defined)
TIMER := $(shell date +%s)
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21 changes: 21 additions & 0 deletions general/package/all-patches/m4/0001-fix-gnulib-nodiscard-gcc15.patch
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@@ -0,0 +1,21 @@
From: OpenIPC <dev@openipc.org>
Subject: [PATCH] Fix gnulib _GL_ATTRIBUTE_NODISCARD for GCC 15 / C23

GCC 15 defaults to C23 where __STDC_VERSION__ > 201710L, causing gnulib
to use [[__nodiscard__]] C23 attribute syntax. This syntax doesn't work
when placed between 'inline' and the return type in older gnulib code.

Fall back to __attribute__((warn_unused_result)) which works in all
positions.

--- a/lib/config.hin
+++ b/lib/config.hin
@@ -2586,7 +2586,7 @@
# define _GL_ATTRIBUTE_MALLOC
#endif

-#if 201710L < __STDC_VERSION__
+#if 0 && 201710L < __STDC_VERSION__
# define _GL_ATTRIBUTE_NODISCARD [[__nodiscard__]]
#elif _GL_HAS_ATTRIBUTE (warn_unused_result)
# define _GL_ATTRIBUTE_NODISCARD __attribute__ ((__warn_unused_result__))
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