build: explanation about disable CFG_TA_FLOAT_SUPPORT

Author: DemesneGH

build_optee_libraries.sh

@@ -41,6 +41,9 @@ export CROSS_COMPILE64="aarch64-linux-gnu-"
 
 # build optee_os and optee_client for qemu_v8
 git clone https://github.com/OP-TEE/optee_os.git -b $OPTEE_VERSION $OPTEE_DIR/optee_os
+# set CFG_TA_FLOAT_SUPPORT=n as workaround to fix the building error of 32bit tls TAs:
+#   multiple definition of `__aeabi_fcmple' (`__aeabi_fcmpeq' and others)
+# This means the __aeabi functions are defined both in Rustc compiler_builtins and optee libutils.
 (cd $OPTEE_DIR/optee_os && make PLATFORM=vexpress-qemu_armv8a CFG_TA_FLOAT_SUPPORT=n)
 
 git clone https://github.com/OP-TEE/optee_client.git -b $OPTEE_VERSION $OPTEE_DIR/optee_client

scripts/setup/build_optee_libraries.sh

@@ -32,7 +32,10 @@ export CROSS_COMPILE64="${CROSS_COMPILE64:-aarch64-linux-gnu-}"
 
 # build optee_os and optee_client for qemu_v8
 git clone https://github.com/OP-TEE/optee_os.git -b $OPTEE_VERSION $OPTEE_DIR/optee_os
-(cd $OPTEE_DIR/optee_os && make PLATFORM=vexpress-qemu_armv8a -j$(nproc))
+# set CFG_TA_FLOAT_SUPPORT=n as workaround to fix the building error of 32bit tls TAs:
+#   multiple definition of `__aeabi_fcmple' (`__aeabi_fcmpeq' and others)
+# This means the __aeabi functions are defined both in Rustc compiler_builtins and optee libutils.
+(cd $OPTEE_DIR/optee_os && make PLATFORM=vexpress-qemu_armv8a CFG_TA_FLOAT_SUPPORT=n -j$(nproc))
 
 git clone https://github.com/OP-TEE/optee_client.git -b $OPTEE_VERSION $OPTEE_DIR/optee_client
 (cd $OPTEE_DIR/optee_client && make -j$(nproc) WITH_TEEACL=0 DESTDIR=$PWD/export_arm32 CROSS_COMPILE=$CROSS_COMPILE32)