[Ping^2][patch,avr, 2/3] Support 64-bit (long) double: The libgcc changes.

[Georg-Johann Lay]

Ping #2

Georg-Johann Lay schrieb:

Am 16.12.19 um 17:40 schrieb Georg-Johann Lay:

Patch 2/3 is the libgcc additions:

--with-libf7 selects which makefile-snips from libf7 to use.

libgcc/
    * config.host (tmake_file) [target=avr]: Add t-libf7,
    t-libf7-math, t-libf7-math-symbols as specified by --with-libf7=.
    * config/avr/t-avrlibc: Don't copy libgcc.a if there are modules
    depending on sizeof (double) or sizeof (long double).
    * config/avr/libf7: New folder.

Index: libgcc/config.host
===================================================================
--- libgcc/config.host  (revision 278552)
+++ libgcc/config.host  (working copy)
@@ -514,6 +514,29 @@ arm*-*-eabi* | arm*-*-symbianelf* | arm*
 avr-*-*)
        # Make HImode functions for AVR
        tmake_file="${cpu_type}/t-avr t-fpbit"
+       # Make some DFmode functions from libf7, part of avr-libgcc.
+       # This must be prior to adding t-avrlibc.
+       case "y${with_libf7}" in
+           yno)
+               # No libf7 support.
+               ;;
+           ylibgcc)
+               tmake_file="$tmake_file ${cpu_type}/libf7/t-libf7"
+               ;;
+           ymath)
+               tmake_file="$tmake_file ${cpu_type}/libf7/t-libf7-math"
+               tmake_file="$tmake_file ${cpu_type}/libf7/t-libf7"
+               ;;
+           ymath-symbols | yyes | y)
+               tmake_file="$tmake_file ${cpu_type}/libf7/t-libf7-math-symbols"
+               tmake_file="$tmake_file ${cpu_type}/libf7/t-libf7-math"
+               tmake_file="$tmake_file ${cpu_type}/libf7/t-libf7"
+               ;;
+           *)
+               echo "Error: --with-libf7=${with_libf7} but can only be used 
with: 'libgcc', 'math', 'math-symbols', 'yes', 'no'" 1>&2
+               exit 1
+               ;;
+       esac
        if test x${with_avrlibc} != xno; then
            tmake_file="$tmake_file ${cpu_type}/t-avrlibc"
        fi
Index: libgcc/config/avr/t-avrlibc
===================================================================
--- libgcc/config/avr/t-avrlibc (revision 278992)
+++ libgcc/config/avr/t-avrlibc (working copy)
@@ -65,6 +65,12 @@ LIB2FUNCS_EXCLUDE += \
        _fixunssfdi \
        _floatdisf _floatundisf
 
+ifeq (,$(WITH_LIBF7_MATH_SYMBOLS))
+
+# No modules depend on __SIZEOF_LONG_DOUBLE__ or __SIZEOF_DOUBLE__
+# which means we might have an opportunity to copy libgcc.a.
+# WITH_LIBF7_MATH_SYMBOLS is set by libf7/t-libf7-math-symbols.
+
 ifneq (,$(findstring avr,$(MULTISUBDIR)))
 
 # We are not in the avr2 (default) subdir, hence copying will work.
@@ -95,3 +101,4 @@ Makefile: t-copy-libgcc.dep
 
 endif
 endif
+endif