configure: switch from -std=gnu99 to -std=gnu11

rockbox-gerrit-noreply--- via rockbox-cvs <[email protected]> Mon, 25 May 2026 08:48:55 -0400

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commit 44e8d8226a92cb1c20e605dd73e15c8fcc4ad00f
Author: mojyack <[email protected]>
Date:   Mon Apr 20 12:37:05 2026 +0900

    configure: switch from -std=gnu99 to -std=gnu11
    
    which is required for u"" unicode string literals used in the USB stack.
    gcc allows this even in gnu99, but clang does not.
    
    Change-Id: I1700fe503f20f31ba4704f8bef1ccca45f822620

diff --git a/tools/configure b/tools/configure
index 800013ee25..a0a647bee2 100755
--- a/tools/configure
+++ b/tools/configure
@@ -8,7 +8,7 @@
 #
 
 # global CC options for all platforms
-CCOPTS="-W -Wall -Wextra -Wundef -Os -nostdlib -ffreestanding -Wstrict-prototypes -pipe -std=gnu99 -funit-at-a-time -fno-delete-null-pointer-checks -fno-strict-overflow -fno-common"
+CCOPTS="-W -Wall -Wextra -Wundef -Os -nostdlib -ffreestanding -Wstrict-prototypes -pipe -std=gnu11 -funit-at-a-time -fno-delete-null-pointer-checks -fno-strict-overflow -fno-common"
 
 # LD options for the core
 LDOPTS=""
-- 
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