gcc: do build ibm128 support code on musl but do not emit fp abi attr
This allows the __ibm128 type to work on musl without failing on missing symbols, while still supporting musl's 64-bit ldbl env.
This commit is contained in:
q66
Daniel Kolesa
parent
fa5138cc28
commit
e1f7e131c0
38
srcpkgs/gcc/patches/libgcc-ibm128-no-tag.patch
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38
srcpkgs/gcc/patches/libgcc-ibm128-no-tag.patch
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@ -0,0 +1,38 @@
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From 236634eed58fa6e00cc50f19e7202903a9d8fae6 Mon Sep 17 00:00:00 2001
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From: q66 <daniel@octaforge.org>
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Date: Thu, 12 Dec 2019 04:03:56 +0100
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Subject: [PATCH] libgcc: use -mno-gnu-attribute for 128-bit IBM ldouble
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support code
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Doing this will allow libgcc to emit the appropriate symbols without actually
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emitting the FP ABI tag for them, which allows 64-bit long double environments
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to function and even link statically while still allowing usage of
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explicit __ibm128.
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---
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libgcc/config/rs6000/t-ibm-ldouble | 2 +-
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libgcc/config/rs6000/t-linux | 2 +-
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2 files changed, 2 insertions(+), 2 deletions(-)
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diff --git a/libgcc/config/rs6000/t-ibm-ldouble b/libgcc/config/rs6000/t-ibm-ldouble
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index b132784..fb5eca8 100644
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--- libgcc/config/rs6000/t-ibm-ldouble
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+++ libgcc/config/rs6000/t-ibm-ldouble
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@@ -1,6 +1,6 @@
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# GCC 128-bit long double support routines.
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LIB2ADD += $(srcdir)/config/rs6000/ibm-ldouble.c
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-HOST_LIBGCC2_CFLAGS += -mlong-double-128
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+HOST_LIBGCC2_CFLAGS += -mlong-double-128 -mno-gnu-attribute
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SHLIB_MAPFILES += $(srcdir)/config/rs6000/libgcc-ibm-ldouble.ver
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diff --git a/libgcc/config/rs6000/t-linux b/libgcc/config/rs6000/t-linux
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index 4f6d4c4..fa93bb6 100644
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--- libgcc/config/rs6000/t-linux
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+++ libgcc/config/rs6000/t-linux
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@@ -1,3 +1,3 @@
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SHLIB_MAPFILES += $(srcdir)/config/rs6000/libgcc-glibc.ver
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-HOST_LIBGCC2_CFLAGS += -mlong-double-128 -mno-minimal-toc
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+HOST_LIBGCC2_CFLAGS += -mlong-double-128 -mno-gnu-attribute -mno-minimal-toc
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--
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2.24.0
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@ -1,138 +0,0 @@
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From 330788a7acde436c1ee8fcb0c1fd657e6ffab8fd Mon Sep 17 00:00:00 2001
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From: q66 <daniel@octaforge.org>
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Date: Thu, 2 May 2019 18:58:29 +0200
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Subject: [PATCH] libgcc: do not build 128-bit long double runtime support for
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musl
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Another patch was already disabling 128-bit long doubles for the
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compiler itself, this one additionally avoids building the runtime
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support for that.
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Musl does not support 128-bit long doubles, and building libgcc
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with 128-bit long double ABI was breaking things like ld.gold
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which refuses to link two objects with different FP ABI tags.
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---
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libgcc/config.host | 10 +++++++++-
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libgcc/config/rs6000/ppc64-fp.c | 14 ++++++++++++++
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libgcc/config/rs6000/t-musl | 8 ++++++++
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3 files changed, 31 insertions(+), 1 deletion(-)
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create mode 100644 libgcc/config/rs6000/t-musl
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diff --git a/libgcc/config.host b/libgcc/config.host
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index 11b4aca..51ceef5 100644
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--- libgcc/config.host
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+++ libgcc/config.host
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@@ -1071,8 +1071,16 @@ powerpc-*-rtems*)
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extra_parts="$extra_parts crtbeginS.o crtendS.o crtbeginT.o ecrti.o ecrtn.o ncrti.o ncrtn.o"
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;;
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powerpc*-*-linux*)
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- tmake_file="${tmake_file} rs6000/t-ppccomm rs6000/t-savresfgpr rs6000/t-crtstuff rs6000/t-linux t-dfprules rs6000/t-ppc64-fp t-slibgcc-libgcc"
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+ tmake_file="${tmake_file} rs6000/t-ppccomm rs6000/t-savresfgpr rs6000/t-crtstuff t-dfprules rs6000/t-ppc64-fp t-slibgcc-libgcc"
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tmake_file="${tmake_file} t-stack rs6000/t-stack-rs6000"
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+ case ${host} in
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+ powerpc*-*-linux-musl*)
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+ tmake_file="${tmake_file} rs6000/t-musl"
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+ ;;
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+ *)
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+ tmake_file="${tmake_file} rs6000/t-linux"
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+ ;;
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+ esac
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case $ppc_fp_type in
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64)
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;;
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diff --git a/libgcc/config/rs6000/ppc64-fp.c b/libgcc/config/rs6000/ppc64-fp.c
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index faffc82..9f479ee 100644
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--- libgcc/config/rs6000/ppc64-fp.c
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+++ libgcc/config/rs6000/ppc64-fp.c
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@@ -25,25 +25,34 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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<http://www.gnu.org/licenses/>. */
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#if defined(__powerpc64__) || defined (__64BIT__) || defined(__ppc64__)
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+#if __LDBL_MANT_DIG__ > __DBL_MANT_DIG__
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#define TMODES
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+#endif
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#include "fp-bit.h"
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+#ifdef TMODES
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extern DItype __fixtfdi (TFtype);
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+#endif
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extern DItype __fixdfdi (DFtype);
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extern DItype __fixsfdi (SFtype);
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extern USItype __fixunsdfsi (DFtype);
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extern USItype __fixunssfsi (SFtype);
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+#ifdef TMODES
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extern TFtype __floatditf (DItype);
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extern TFtype __floatunditf (UDItype);
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+#endif
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extern DFtype __floatdidf (DItype);
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extern DFtype __floatundidf (UDItype);
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extern SFtype __floatdisf (DItype);
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extern SFtype __floatundisf (UDItype);
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+#ifdef TMODES
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extern DItype __fixunstfdi (TFtype);
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+#endif
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static DItype local_fixunssfdi (SFtype);
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static DItype local_fixunsdfdi (DFtype);
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+#ifdef TMODES
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DItype
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__fixtfdi (TFtype a)
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{
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@@ -51,6 +60,7 @@ __fixtfdi (TFtype a)
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return - __fixunstfdi (-a);
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return __fixunstfdi (a);
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}
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+#endif
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DItype
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__fixdfdi (DFtype a)
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@@ -86,6 +96,7 @@ __fixunssfsi (SFtype a)
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return (SItype) a;
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}
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+#ifdef TMODES
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TFtype
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__floatditf (DItype u)
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{
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@@ -109,6 +120,7 @@ __floatunditf (UDItype u)
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return (TFtype) dh + (TFtype) dl;
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}
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+#endif
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DFtype
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__floatdidf (DItype u)
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@@ -183,6 +195,7 @@ __floatundisf (UDItype u)
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return (SFtype) f;
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}
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+#ifdef TMODES
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DItype
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__fixunstfdi (TFtype a)
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{
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@@ -206,6 +219,7 @@ __fixunstfdi (TFtype a)
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v += (USItype) a;
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return v;
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}
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+#endif
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/* This version is needed to prevent recursion; fixunsdfdi in libgcc
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calls fixdfdi, which in turn calls calls fixunsdfdi. */
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diff --git a/libgcc/config/rs6000/t-musl b/libgcc/config/rs6000/t-musl
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new file mode 100644
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index 0000000..f261d8a
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--- /dev/null
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+++ libgcc/config/rs6000/t-musl
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@@ -0,0 +1,8 @@
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+# Overrides for musl; we want to avoid building all these implementations
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+# required for quad-precision float handling as musl does not support that,
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+# ibm-ldouble.c is added into the build by t-ppccomm
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+
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+HOST_LIBGCC2_CFLAGS += -mlong-double-64 -mno-minimal-toc
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+
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+# We do not want to build ibm-ldouble.c.
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+LIB2ADD := $(filter-out %ibm-ldouble.c, $(LIB2ADD))
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--
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2.21.0
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