Hello, I built a riscv64-rtems5 GCC (it uses gcc/config/riscv/t-elf-multilib). The following multilibs are built:
riscv64-rtems5-gcc -print-multi-lib .; rv32i/ilp32;@march=rv32i@mabi=ilp32 rv32im/ilp32;@march=rv32im@mabi=ilp32 rv32iac/ilp32;@march=rv32iac@mabi=ilp32 rv32imac/ilp32;@march=rv32imac@mabi=ilp32 rv32imafc/ilp32f;@march=rv32imafc@mabi=ilp32f rv64imac/lp64;@march=rv64imac@mabi=lp64 rv64imafdc/lp64d;@march=rv64imafdc@mabi=lp64d If I print out the builtin defines and search paths for the default settings and the -march=rv64imafdc and compare the results I get: riscv64-rtems5-gcc -E -P -v -dD empty.c > def.txt 2>&1 riscv64-rtems5-gcc -E -P -v -dD empty.c -march=rv64imafdc > rv64imafdc.txt 2>&1 diff -u def.txt rv64imafdc.txt --- def.txt 2018-05-26 14:53:26.277760090 +0200 +++ rv64imafdc.txt 2018-05-26 14:53:47.705638409 +0200 @@ -4,8 +4,8 @@ Configured with: ../gcc-7.3.0/configure --prefix=/opt/rtems/5 --bindir=/opt/rtems/5/bin --exec_prefix=/opt/rtems/5 --includedir=/opt/rtems/5/include --libdir=/opt/rtems/5/lib --libexecdir=/opt/rtems/5/libexec --mandir=/opt/rtems/5/share/man --infodir=/opt/rtems/5/share/info --datadir=/opt/rtems/5/share --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=riscv64-rtems5 --disable-libstdcxx-pch --with-gnu-as --with-gnu-ld --verbose --with-newlib --disable-nls --without-included-gettext --disable-win32-registry --enable-version-specific-runtime-libs --disable-lto --enable-newlib-io-c99-formats --enable-newlib-iconv --enable-newlib-iconv-encodings=big5,cp775,cp850,cp852,cp855,cp866,euc_jp,euc_kr,euc_tw,iso_8859_1,iso_8859_10,iso_8859_11,iso_8859_13,iso_8859_14,iso_8859_15,iso_8859_2,iso_8859_3,iso_8859_4,iso_8859_5,iso_8859_6,iso_8859_7,iso_8859_8,iso_8859_9,iso_ir_111,koi8_r,koi8_ru,koi8_u,koi8_uni,ucs_2,ucs_2_internal,ucs_2be,ucs_2le,ucs_4,ucs_4_internal,ucs_4be,ucs_4le,us_ascii,utf_16,utf_16be,utf_16le,utf_8,win_1250,win_1251,win_1252,win_1253,win_1254,win_1255,win_1256,win_1257,win_1258 --enable-threads --disable-plugin --enable-libgomp --enable-languages=c,c++,ada Thread model: rtems gcc version 7.3.0 20180125 (RTEMS 5, RSB a3a6c34c150a357e57769a26a460c475e188438f, Newlib 3.0.0) (GCC) -COLLECT_GCC_OPTIONS='-E' '-P' '-v' '-dD' '-march=rv64gc' '-mabi=lp64d' - /opt/rtems/5/libexec/gcc/riscv64-rtems5/7.3.0/cc1 -E -quiet -v -P -imultilib rv64imafdc/lp64d empty.c -march=rv64gc -mabi=lp64d -dD +COLLECT_GCC_OPTIONS='-E' '-P' '-v' '-dD' '-march=rv64imafdc' '-mabi=lp64d' + /opt/rtems/5/libexec/gcc/riscv64-rtems5/7.3.0/cc1 -E -quiet -v -P -imultilib rv64imafdc/lp64d empty.c -march=rv64imafdc -mabi=lp64d -dD ignoring nonexistent directory "/opt/rtems/5/lib/gcc/riscv64-rtems5/7.3.0/../../../../riscv64-rtems5/sys-include" #include "..." search starts here: #include <...> search starts here: @@ -338,4 +338,4 @@ #define __ELF__ 1 COMPILER_PATH=/opt/rtems/5/libexec/gcc/riscv64-rtems5/7.3.0/:/opt/rtems/5/libexec/gcc/riscv64-rtems5/7.3.0/:/opt/rtems/5/libexec/gcc/riscv64-rtems5/:/opt/rtems/5/lib/gcc/riscv64-rtems5/7.3.0/:/opt/rtems/5/lib/gcc/riscv64-rtems5/:/opt/rtems/5/lib/gcc/riscv64-rtems5/7.3.0/../../../../riscv64-rtems5/bin/ LIBRARY_PATH=/opt/rtems/5/lib/gcc/riscv64-rtems5/7.3.0/rv64imafdc/lp64d/:/opt/rtems/5/lib/gcc/riscv64-rtems5/7.3.0/../../../../riscv64-rtems5/lib/rv64imafdc/lp64d/:/opt/rtems/5/lib/gcc/riscv64-rtems5/7.3.0/:/opt/rtems/5/lib/gcc/riscv64-rtems5/7.3.0/../../../../riscv64-rtems5/lib/:/lib/:/usr/lib/ -COLLECT_GCC_OPTIONS='-E' '-P' '-v' '-dD' '-march=rv64gc' '-mabi=lp64d' +COLLECT_GCC_OPTIONS='-E' '-P' '-v' '-dD' '-march=rv64imafdc' '-mabi=lp64d' This looks pretty much the same and the documentation says that G == IMAFD. Why is the default multilib and a variant identical? Most variants include the C extension. Would it be possible to add -march=rv32g and -march=rv64g variants? -- Sebastian Huber, embedded brains GmbH Address : Dornierstr. 4, D-82178 Puchheim, Germany Phone : +49 89 189 47 41-16 Fax : +49 89 189 47 41-09 Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
