BUILD(cmake): Use big file linker option

Using a unity build tends to create large source files. With that it is
easily possible to hit the object file's size limit resulting in the
"C1128: number of sections exceeded object file format limit" (MSVC) or
"File too big" (GCC) error.

In order to avoid this, this commit sets the necessary flag to extend
that limit.

1 files changed, 11 insertions, 0 deletions

diff --git a/cmake/compiler.cmake b/cmake/compiler.cmake
index 4e27ff373..ac4b50d04 100644
--- a/cmake/compiler.cmake
+++ b/cmake/compiler.cmake
@@ -3,6 +3,8 @@
 # that can be found in the LICENSE file at the root of the
 # Mumble source tree or at <https://www.mumble.info/LICENSE>.
 
+include(CheckCXXCompilerFlag)
+
 if(${CMAKE_SIZEOF_VOID_P} EQUAL 8)
 	set(64_BIT TRUE)
 elseif(${CMAKE_SIZEOF_VOID_P} EQUAL 4)
@@ -24,6 +26,9 @@ if(MSVC)
 		"$<$<CONFIG:Release>:/fp:fast>"
 	)
 
+	# Needed in order to not run into C1128: number of sections exceeded object file format limit
+	add_compile_options(/bigobj)
+
 	if(32_BIT)
 		# SSE2 code is generated by default, unless an explicit arch is set.
 		# Our 32 bit binaries should not contain any SSE2 code, so override the default.
@@ -61,6 +66,12 @@ elseif(UNIX OR MINGW)
 		"-Wextra"
 	)
 
+	# Avoid "File too big" error
+	check_cxx_compiler_flag("Wa,-mbig-obj" COMPILER_HAS_MBIG_OBJ)
+	if (${COMPILER_HAS_MBIG_OBJ})
+		add_compile_options("-Wa,-mbig-obj")
+	endif()
+
 	if(options)
 		add_compile_options(
 			"-O3"