[Fix] build: Makefile: Emscripten: Fix build. Broken since r22884.

git-svn-id: https://source.openmpt.org/svn/openmpt/trunk/OpenMPT@22941 56274372-70c3-4bfc-bfc3-4c3a0b034d27

Author: manxorist

build/make/config-emscripten.mk

@@ -144,6 +144,8 @@ CFLAGS   += -s DISABLE_EXCEPTION_CATCHING=0 -fno-strict-aliasing
 LDFLAGS  += -s DISABLE_EXCEPTION_CATCHING=0 -s ERROR_ON_UNDEFINED_SYMBOLS=1 -s ERROR_ON_MISSING_LIBRARIES=1 -s EXPORT_NAME="'libopenmpt'"
 SO_LDFLAGS += -s EXPORTED_FUNCTIONS="['_malloc','_free']"
 
+NO_NO_UNDEFINED_LINKER_FLAG=1
+
 include build/make/warnings-clang.mk
 
 REQUIRES_RUNPREFIX=1

build/make/warnings-clang.mk

@@ -15,7 +15,9 @@ endif
 #CXXFLAGS_WARNINGS += -Wconversion
 #CXXFLAGS_WARNINGS += -Weverything -Wno-c++98-compat -Wno-c++98-compat-pedantic -Wno-c++98-c++11-c++14-compat -Wno-padded -Wno-weak-vtables -Wno-sign-conversion -Wno-shadow-field-in-constructor -Wno-conversion -Wno-switch-enum -Wno-old-style-cast
 
+ifneq ($(NO_NO_UNDEFINED_LINKER_FLAG),1)
 LDFLAGS_WARNINGS  += -Wl,--no-undefined
+endif
 
 ifeq ($(MODERN),1)
 CXXFLAGS_WARNINGS += 

build/make/warnings-gcc.mk

@@ -4,7 +4,9 @@ CFLAGS_WARNINGS   += -Wcast-align -Wcast-qual -Wdouble-promotion -Wfloat-convers
 
 CXXFLAGS_WARNINGS += -Wno-psabi
 
+ifneq ($(NO_NO_UNDEFINED_LINKER_FLAG),1)
 LDFLAGS_WARNINGS  += -Wl,--no-undefined
+endif
 
 ifeq ($(MODERN),1)
 # GCC >= 12