Hi,
The new instructions in FPV5-SP-D16 compared to FPv4-SP-D16 are not
generated when building libgcc, newlib of libstdc++ such that libgcc.a,
libc.a and libstdc++.a have the same objdump output for these two
variants. It is therefore a waste of build time to be building a
multilib for ARMv7E-M FPV5-SP-D16 when selecting rmprofile multilib
variant. This patch applied to embedded-6-branch removes that multilib
and map FPv5-SP-D16 to FPv4-SP-D16.
ChangeLog entry is as follows:
*** gcc/ChangeLog.arm ***
2017-07-04 Thomas Preud'homme <thomas.preudho...@arm.com>
* config/arm/t-rmprofile: Remove multilibs for fpv5-sp-d16 and map it to
fpv4-sp-d16.
Tested by configuring GCC with --with-multilib-list=rmprofile, building it and
running the following:
% ./install/bin/arm-none-eabi-gcc -march=armv7e-m -mfpu=fpv5-sp-d16
-mfloat-abi=hard -print-multi-directory
thumb/v7e-m/fpv4-sp/hard
% ./install/bin/arm-none-eabi-gcc -march=armv7e-m -mfpu=fpv5-sp-d16
-mfloat-abi=softfp -print-multi-directory
thumb/v7e-m/fpv4-sp/softfp
Best regards,
Thomas
diff --git a/gcc/config/arm/t-rmprofile b/gcc/config/arm/t-rmprofile
index 93aa909b4d942ad9875a95e0d4397ff17b317905..0f3742009b1459f14d5ebbaaeb0fd080e79c8acb 100644
--- a/gcc/config/arm/t-rmprofile
+++ b/gcc/config/arm/t-rmprofile
@@ -74,8 +74,6 @@ MULTILIB_REQUIRED += mthumb/march=armv7e-m/mfpu=fpv4-sp-d16/mfloat-abi=soft
MULTILIB_REQUIRED += mthumb/march=armv7e-m/mfpu=fpv4-sp-d16/mfloat-abi=hard
MULTILIB_REQUIRED += mthumb/march=armv7e-m/mfpu=fpv5-d16/mfloat-abi=softfp
MULTILIB_REQUIRED += mthumb/march=armv7e-m/mfpu=fpv5-d16/mfloat-abi=hard
-MULTILIB_REQUIRED += mthumb/march=armv7e-m/mfpu=fpv5-sp-d16/mfloat-abi=softfp
-MULTILIB_REQUIRED += mthumb/march=armv7e-m/mfpu=fpv5-sp-d16/mfloat-abi=hard
# ARMv8-M Mainline
MULTILIB_REQUIRED += mthumb/march=armv8-m.main
@@ -174,3 +172,7 @@ MULTILIB_REUSE += mthumb/march.armv7/mfpu.vfpv3-d16/mfloat-abi.softfp=ma
MULTILIB_REUSE += mthumb/march.armv7/mfpu.vfpv3-d16/mfloat-abi.hard=march.armv7/mfpu.fpv5-d16/mfloat-abi.hard
MULTILIB_REUSE += mthumb/march.armv7/mfpu.vfpv3-d16/mfloat-abi.softfp=mthumb/march.armv7/mfpu.fpv5-d16/mfloat-abi.softfp
MULTILIB_REUSE += mthumb/march.armv7/mfpu.vfpv3-d16/mfloat-abi.hard=mthumb/march.armv7/mfpu.fpv5-d16/mfloat-abi.hard
+
+# Map ARMv7E-M FPV5-SP-D16 to FPV4-SP-D16
+MULTILIB_REUSE += mthumb/march.armv7e-m/mfpu.fpv4-sp-d16/mfloat-abi.softfp=mthumb/march.armv7e-m/mfpu.fpv5-sp-d16/mfloat-abi.softfp
+MULTILIB_REUSE += mthumb/march.armv7e-m/mfpu.fpv4-sp-d16/mfloat-abi.hard=mthumb/march.armv7e-m/mfpu.fpv5-sp-d16/mfloat-abi.hard
