[Buildroot] [git commit] package/harfbuzz: fix build without threads

commit: https://git.buildroot.net/buildroot/commit/?id=6454eacf1018ec9be9d4f833e7a8f0a21a47f167
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/master

Fix the following build failures without threads by defining HB_NO_MT as
specified in https://github.com/harfbuzz/harfbuzz/blob/main/CONFIG.md:

In file included from ../src/hb.hh:458,
                 from ../src/hb-blob.cc:28:
../src/hb-mutex.hh:88:2: error: #error "Could not find any system to define mutex macros."
   88 | #error "Could not find any system to define mutex macros."
      |  ^~~~~

This build failure is raised since bump to version 2.8.1 in commit
e9ba1c80e8ebf5f5ad9d889d2dd37f27af87e811 and
https://github.com/harfbuzz/harfbuzz/commit/711c241f6c7e18c5403602375a733af74df76f83
which removed busyloop mutex implementation.

Fixes:
 - http://autobuild.buildroot.org/results/0c03aca5e3ade735b54b0b9233896b868aec1520

Signed-off-by: Fabrice Fontaine <redacted>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
---
 package/harfbuzz/harfbuzz.mk | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/package/harfbuzz/harfbuzz.mk b/package/harfbuzz/harfbuzz.mk
index f327a95eb6..c7f5dfe9d2 100644
--- a/package/harfbuzz/harfbuzz.mk
+++ b/package/harfbuzz/harfbuzz.mk

@@ -90,5 +90,9 @@ else
 HARFBUZZ_CONF_OPTS += -Dicu=disabled
 endif
 
+ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),)
+HARFBUZZ_CXXFLAGS += $(TARGET_CXXFLAGS) -DHB_NO_MT
+endif
+
 $(eval $(meson-package))
 $(eval $(host-meson-package))

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