firefox: remove hard clang dependency

Firefox compiles with gcc - remove the hardcoded clang dependency.

New patch: a component is trying to remove some gcc warnings. OE adds
-Wformat-security by default, but the component also adds -Wno-format, which
cancels it out, but generates a warning (which is turned into an error):

cc1plus: error: '-Wformat-security' ignored without '-Wformat' [-Werror=format-security]

To avoid this, the patch adds also -Wno-format-security explicitly.

Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>

Author: OldManYellsAtCloud

meta-firefox/recipes-browser/firefox/firefox.inc

@@ -54,7 +54,6 @@ SRC_URI += "https://ftp.mozilla.org/pub/firefox/releases/${PV}/source/firefox-${
            file://0001-Add-option-to-disable-arm-hw-crypto-engine.patch \
            file://0001-Fix-conflicting-types-for-once_flag-and-call_once-wi.patch \
            file://fix-glibc-2.43-compilation.patch \
-           file://freebl-ignore-unused-arguments-during-configure.patch \
            file://debian-hacks/Add-another-preferences-directory-for-applications-p.patch \
            file://debian-hacks/Avoid-using-vmrs-vmsr-on-armel.patch \
            file://debian-hacks/Avoid-wrong-sessionstore-data-to-keep-windows-out-of.patch \
@@ -73,6 +72,9 @@ SRC_URI += "https://ftp.mozilla.org/pub/firefox/releases/${PV}/source/firefox-${
            file://prefs/Set-DPI-to-system-settings.patch \
            "
 
+SRC_URI:append:toolchain-gcc = " file://fix-gcc-compilation.patch"
+SRC_URI:append:toolchain-clang = " file://freebl-ignore-unused-arguments-during-configure.patch"
+
 SRCREV_FORMAT = "default"
 
 # Add a config file to enable GPU acceleration by default.
@@ -92,8 +94,6 @@ SRC_URI += "${@bb.utils.contains('PACKAGECONFIG', 'forbid-multiple-compositors',
             file://fixes/0001-Enable-to-suppress-multiple-compositors.patch \
            ', '', d)}"
 
-TOOLCHAIN:pn-firefox = "clang"
-
 DISABLE_STATIC = ""
 
 PACKAGECONFIG ??= "${@bb.utils.contains("DISTRO_FEATURES", "alsa", "alsa", "", d)} \

meta-firefox/recipes-browser/firefox/firefox/fix-gcc-compilation.patch

@@ -0,0 +1,21 @@
+By default, OE sets "-Wformat-security" in the CFLAGS variable.
+One particular module in the Firefox tree is trying to disable all
+such warnings, however it doesn't disable the -Wformat-security
+flag in particular, and due to this, compilation fails with the
+following error:
+
+cc1plus: error: '-Wformat-security' ignored without '-Wformat' [-Werror=format-security]
+
+Add this missing warning removal to the list of ignored warnings.
+
+Upstream-Status: Inappropriate [oe-specific]
+Signed-off-by: Gyorgy Sarvari <skandigraun@gmail.com>
+
+--- ./js/src/xsum/moz.build.orig	2026-05-29 10:18:14.888226193 +0200
++++ ./js/src/xsum/moz.build	2026-05-29 10:18:29.490810894 +0200
+@@ -17,4 +17,4 @@
+ ]
+ 
+ # Suppress warnings in third-party code.
+-SOURCES['xsum.cpp'].flags += ['-Wno-implicit-fallthrough', '-Wno-format', '-Wno-unused-value']
++SOURCES['xsum.cpp'].flags += ['-Wno-implicit-fallthrough', '-Wno-format', '-Wno-unused-value', '-Wno-format-security']

meta-firefox/recipes-browser/firefox/firefox/freebl-ignore-unused-arguments-during-configure.patch

@@ -1,4 +1,4 @@
-Clang sends warnings about unsued command line arguments to stderr during configuring
+Clang sends warnings about unused command line arguments to stderr during configuring
 freebl (which is enabled for targets without hw crypto support). Gyp only checks
 if there is anything on stderr, but not the content - it throws an error like this: