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cc/gcc: add option to enable/disable decimal floats

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Decimal floats need support form the C library, namely support
for fenv, which is missing in uClibc for any architecture but
x86/32.

Add an option (a choice) to enable or disable decimal floats.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
This commit is contained in:
Yann E. MORIN" 2014-01-04 16:17:40 +01:00
parent 92f8806b2d
commit 2ee8d1d8f2
2 changed files with 56 additions and 0 deletions
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46
config/cc/gcc.in.2
View File

@ -255,6 +255,52 @@ config CC_GCC_LNK_HASH_STYLE
default "gnu" if CC_GCC_LNK_HASH_STYLE_GNU
default "both" if CC_GCC_LNK_HASH_STYLE_BOTH
choice CC_GCC_DEC_FLOATS_CHOICE
bool "Decimal floats"
default CC_GCC_DEC_FLOATS_AUTO
help
Choose what type of decimal floats to support.
Note that using decimal floats requires a C library that provides
support for fenv (namely, the fenv.h header). This is the case
for (e)glibc, and uClibc on x86/32. For other C libraries, or
uClibc on other archs, this might not be the case, so you should
disable support for decimal floats.
The default is to let ./configure decide.
config CC_GCC_DEC_FLOAT_AUTO
bool "auto"
help
Let ./configure decide. If you say 'y' here, gcc will default to:
- 'bid' for x86 (32- and 64-bit)
- 'dpd' for powerpc
- 'no' for the other architectures
config CC_GCC_DEC_FLOAT_BID
bool "bid"
help
Use the 'binary integer decimal' format for decimal floats.
config CC_GCC_DEC_FLOAT_DPD
bool "dpd"
help
Use the 'densely packed decimal' for decimal floats.
config CC_GCC_DEC_FLOATS_NO
bool "no"
help
Do not support decimal floats. The default.
endchoice # CC_GCC_DEC_FLOATS_CHOICE
config CC_GCC_DEC_FLOATS
string
default "" if CC_GCC_DEC_FLOATS_AUTO
default "bid" if CC_GCC_DEC_FLOATS_BID
default "dpd" if CC_GCC_DEC_FLOATS_DPD
default "no" if CC_GCC_DEC_FLOATS_NO
#-----------------------------------------------------------------------------
config CC_GCC_HAS_ARCH_OPTIONS

10
scripts/build/cc/gcc.sh
View File

@ -333,6 +333,11 @@ do_cc_core_backend() {
*) extra_config+=( "--with-linker-hash-style=${CT_CC_GCC_LNK_HASH_STYLE}" );;
esac
case "${CT_CC_GCC_DEC_FLOATS}" in
"") ;;
*) extra_config+=( "--enable-decimal-float=${CT_CC_GCC_DEC_FLOATS}" );;
esac
case "${CT_ARCH}" in
mips)
case "${CT_CC_GCC_mips_llsc}" in
@ -784,6 +789,11 @@ do_cc_backend() {
*) extra_config+=( "--with-linker-hash-style=${CT_CC_GCC_LNK_HASH_STYLE}" );;
esac
case "${CT_CC_GCC_DEC_FLOATS}" in
"") ;;
*) extra_config+=( "--enable-decimal-float=${CT_CC_GCC_DEC_FLOATS}" );;
esac
if [ "${CT_CC_GCC_ENABLE_PLUGINS}" = "y" ]; then
extra_config+=( --enable-plugin )
fi