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gcc/libgcc
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Sergei Trofimovich eaf75155f3 libgcc: make heap-based trampolines conditional on libc presence 
To build `libc` for a target one needs to build `gcc` without `libc`
support first. Commit r14-4823-g8abddb187b3348 "libgcc: support
heap-based trampolines" added unconditional `libc` dependency and broke
libc-less `gcc` builds.

An example failure on `x86_64-unknown-linux-gnu`:

    $ mkdir -p /tmp/empty
    $ ../gcc/configure \
        --disable-multilib \
        --without-headers \
        --with-newlib \
        --enable-languages=c \
        --disable-bootstrap \
        --disable-gcov \
        --disable-threads \
        --disable-shared \
        --disable-libssp \
        --disable-libquadmath \
        --disable-libgomp \
        --disable-libatomic \
        --with-build-sysroot=/tmp/empty
    $ make
    ...
    /tmp/gb/./gcc/xgcc -B/tmp/gb/./gcc/ -B/usr/local/x86_64-pc-linux-gnu/bin/ -B/usr/local/x86_64-pc-linux-gnu/lib/ -isystem /usr/local/x86_64-pc-linux-gnu/include -isystem /usr/local/x86_64-pc-linux-gnu/sys-include --sysroot=/tmp/empty   -g -O2 -O2  -g -O2 -DIN_GCC   -W -Wall -Wno-narrowing -Wwrite-strings -Wcast-qual -Wstrict-prototypes -Wmissing-prototypes -Wold-style-definition  -isystem ./include  -fpic -mlong-double-80 -DUSE_ELF_SYMVER -fcf-protection -mshstk -g -DIN_LIBGCC2 -fbuilding-libgcc -fno-stack-protector -Dinhibit_libc -fpic -mlong-double-80 -DUSE_ELF_SYMVER -fcf-protection -mshstk -I. -I. -I../.././gcc -I/home/slyfox/dev/git/gcc/libgcc -I/home/slyfox/dev/git/gcc/libgcc/. -I/home/slyfox/dev/git/gcc/libgcc/../gcc -I/home/slyfox/dev/git/gcc/libgcc/../include  -DHAVE_CC_TLS  -DUSE_TLS  -o heap-trampoline.o -MT heap-trampoline.o -MD -MP -MF heap-trampoline.dep  -c .../gcc/libgcc/config/i386/heap-trampoline.c -fvisibility=hidden -DHIDE_EXPORTS
    ../gcc/libgcc/config/i386/heap-trampoline.c:3:10: fatal error: unistd.h: No such file or directory
        3 | #include <unistd.h>
          |          ^~~~~~~~~~
    compilation terminated.
    make[2]: *** [.../gcc/libgcc/static-object.mk:17: heap-trampoline.o] Error 1
    make[2]: Leaving directory '/tmp/gb/x86_64-pc-linux-gnu/libgcc'
    make[1]: *** [Makefile:13307: all-target-libgcc] Error 2

The change inhibits any heap-based trampoline code.

libgcc/

	* config/aarch64/heap-trampoline.c: Disable when libc is not
	present.
	* config/i386/heap-trampoline.c: Ditto.
2023-10-24 08:35:44 +01:00
..
config libgcc: make heap-based trampolines conditional on libc presence 2023-10-24 08:35:44 +01:00
soft-fp libgcc _BitInt helper documentation [PR102989] 2023-09-06 17:42:37 +02:00
ChangeLog Daily bump. 2023-10-23 00:16:43 +00:00
config.host Config,Darwin: Allow for configuring Darwin to use embedded runpath. 2023-10-22 19:30:02 +01:00
config.in gcov: use mmap pools for KVP. 2021-03-03 14:21:45 +01:00
configure Deprecate a.out support for NetBSD targets. 2023-08-07 22:59:41 +02:00
configure.ac LoongArch Port: libgcc 2022-03-29 17:43:35 +08:00
crtstuff.c Update copyright years. 2023-01-16 11:52:17 +01:00
dfp-bit.c Update copyright years. 2023-01-16 11:52:17 +01:00
dfp-bit.h Update copyright years. 2023-01-16 11:52:17 +01:00
divmod.c Update copyright years. 2023-01-16 11:52:17 +01:00
emutls.c Update copyright years. 2023-01-16 11:52:17 +01:00
enable-execute-stack-empty.c
enable-execute-stack-mprotect.c Update copyright years. 2023-01-16 11:52:17 +01:00
find-symver.awk Update copyright years. 2023-01-16 11:52:17 +01:00
fixed-bit.c Update copyright years. 2023-01-16 11:52:17 +01:00
fixed-bit.h Update copyright years. 2023-01-16 11:52:17 +01:00
fixed-obj.mk
floatunsidf.c
floatunsisf.c
floatunsitf.c
floatunsixf.c
fp-bit.c Update copyright years. 2023-01-16 11:52:17 +01:00
fp-bit.h Update copyright years. 2023-01-16 11:52:17 +01:00
gbl-ctors.h Update copyright years. 2023-01-16 11:52:17 +01:00
gcov.h Update copyright years. 2023-01-16 11:52:17 +01:00
gen-fixed.sh
generic-morestack-thread.c Update copyright years. 2023-01-16 11:52:17 +01:00
generic-morestack.c Update copyright years. 2023-01-16 11:52:17 +01:00
generic-morestack.h Update copyright years. 2023-01-16 11:52:17 +01:00
gstdint.h
gthr-posix.h Update copyright years. 2023-01-16 11:52:17 +01:00
gthr-single.h Update copyright years. 2023-01-16 11:52:17 +01:00
gthr.h Update copyright years. 2023-01-16 11:52:17 +01:00
hardcfr.c Control flow redundancy hardening 2023-10-20 07:50:33 -03:00
libgcc-std.ver.in libgcc: support heap-based trampolines 2023-10-22 14:01:47 +01:00
libgcc2.c libgcc _BitInt helper documentation [PR102989] 2023-09-06 17:42:37 +02:00
libgcc2.h libgcc: support heap-based trampolines 2023-10-22 14:01:47 +01:00
libgcov-driver-system.c Update copyright years. 2023-01-16 11:52:17 +01:00
libgcov-driver.c Update copyright years. 2023-01-16 11:52:17 +01:00
libgcov-interface.c Update copyright years. 2023-01-16 11:52:17 +01:00
libgcov-merge.c Update copyright years. 2023-01-16 11:52:17 +01:00
libgcov-profiler.c Update copyright years. 2023-01-16 11:52:17 +01:00
libgcov-util.c Update copyright years. 2023-01-16 11:52:17 +01:00
libgcov.h Update copyright years. 2023-01-16 11:52:17 +01:00
Makefile.in Control flow redundancy hardening 2023-10-20 07:50:33 -03:00
memcmp.c
memcpy.c
memmove.c
memset.c
mkheader.sh Update copyright years. 2023-01-16 11:52:17 +01:00
mkmap-flat.awk Update copyright years. 2023-01-16 11:52:17 +01:00
mkmap-symver.awk Update copyright years. 2023-01-16 11:52:17 +01:00
offloadstuff.c Update copyright years. 2023-01-16 11:52:17 +01:00
shared-object.mk
siditi-object.mk
static-object.mk
sync.c Update copyright years. 2023-01-16 11:52:17 +01:00
udivhi3.c Update copyright years. 2023-01-16 11:52:17 +01:00
udivmod.c Update copyright years. 2023-01-16 11:52:17 +01:00
udivmodhi4.c Update copyright years. 2023-01-16 11:52:17 +01:00
udivmodsi4.c Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-arm-common.inc Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-c.c Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-compat.c Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-compat.h Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-dw2-btree.h Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-dw2-execute_cfa.h libgcc: Fix uninitialized RA signing on AArch64 [PR107678] 2023-01-18 12:20:35 +00:00
unwind-dw2-fde-compat.c Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-dw2-fde-dip.c libgcc: Fix -Wint-conversion warning in find_fde_tail 2023-07-11 06:19:39 +02:00
unwind-dw2-fde.c preserve base pointer for __deregister_frame [PR110956] 2023-08-11 09:20:27 -06:00
unwind-dw2-fde.h Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-dw2.c libgcc: Fix uninitialized RA signing on AArch64 [PR107678] 2023-01-18 12:20:35 +00:00
unwind-dw2.h libgcc: Fix uninitialized RA signing on AArch64 [PR107678] 2023-01-18 12:20:35 +00:00
unwind-generic.h Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-pe.h Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-seh.c Update copyright years. 2023-01-16 11:52:17 +01:00
unwind-sjlj.c Update copyright years. 2023-01-16 11:52:17 +01:00
unwind.inc Update copyright years. 2023-01-16 11:52:17 +01:00
vtv_end.c Update copyright years. 2023-01-16 11:52:17 +01:00
vtv_end_preinit.c Update copyright years. 2023-01-16 11:52:17 +01:00
vtv_start.c Update copyright years. 2023-01-16 11:52:17 +01:00
vtv_start_preinit.c Update copyright years. 2023-01-16 11:52:17 +01:00