[build] Suppress GLFW redefining GLAPIENTRY error

1 files changed, 11 insertions, 0 deletions

diff --git a/cmake/glfw.cmake b/cmake/glfw.cmake
index ba6ba92e9f..f1ace9e6ef 100644
--- a/cmake/glfw.cmake
+++ b/cmake/glfw.cmake
@@ -11,6 +11,17 @@ target_sources(mbgl-glfw
     PRIVATE platform/default/mbgl/util/default_styles.cpp
 )
 
+# Our GL implementation is internal to mbgl-core, which causes the GL header to
+# be included after GLFW's own header. They both attempt to define GLAPIENTRY,
+# but unfortunately the GL header doesn't check if it was previously defined,
+# causing a macro redefinition compiler error.
+# There is no particular compiler warning flag to ignore this check on GCC
+# neither it does accept ignoring '-Werror' via diagnostics pragmas. We can
+# only suppress this by either replacing the header path inclusion from -I to
+# -isystem, or completely suppressing errors. Until the former solution is not
+# available, we'll suppress the errors from that definition file.
+set_source_files_properties(platform/glfw/glfw_view.cpp PROPERTIES COMPILE_FLAGS -Wno-error)
+
 target_compile_options(mbgl-glfw
     PRIVATE -fvisibility-inlines-hidden
 )