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Do not let GCC use built-in functions

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In order to reduce the software dependency on the compiler, the project
is now compiled with the '-ffreestanding' flag. This is to prevent GCC
from replacing functions with more optimised versions. An example is
where GCC replaces a simple printf() with a puts().

Change-Id: I1973fe6957cd708e8432a0039af9d50e037bd884
This commit is contained in:
Harry Liebel 2013-12-20 18:51:12 +00:00 • committed by Dan Handley
parent bdb774df31
commit 0af6d64df3
2 changed files with 6 additions and 2 deletions
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5
Makefile
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@ -96,8 +96,9 @@ INCLUDES += -Ilib/include/ -Iinclude/aarch64/ -Iinclude/ \
-Iarch/system/gic -Icommon/psci \ -Iarch/system/gic -Icommon/psci \
-Iinclude/stdlib -Iinclude/stdlib/sys -Iinclude/stdlib -Iinclude/stdlib/sys
ASFLAGS += -nostdinc -Wa,--fatal-warnings -D__ASSEMBLY__ ${INCLUDES} ASFLAGS += -nostdinc -ffreestanding -Wa,--fatal-warnings \
CFLAGS := -nostdinc -Wall -Werror -std=c99 -c -Os \ -D__ASSEMBLY__ ${INCLUDES}
CFLAGS := -nostdinc -ffreestanding -Wall -Werror -std=c99 -c -Os \
-DDEBUG=${DEBUG} ${INCLUDES} ${CFLAGS} -DDEBUG=${DEBUG} ${INCLUDES} ${CFLAGS}
LDFLAGS += --fatal-warnings -O1 LDFLAGS += --fatal-warnings -O1

3
docs/change-log.md
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@ -82,6 +82,9 @@ Detailed changes since last release
Implementations for `putchar()` and `strchr()` were added to the local C Implementations for `putchar()` and `strchr()` were added to the local C
library. library.
* GCC compiler built-in function support has been disabled in order to improve
compiler independence.
ARM Trusted Firmware - version 0.2 ARM Trusted Firmware - version 0.2
================================== ==================================