gcc/4.9: fix C++ exceptions and pthread_exit()
Following the introduction of the support for the musl C library, the support of C++ exceptions or features like pthread_exit() got broken even with other libraries such as glibc. This was reported as bug #7028. The problem was caused by the gcc patch needed to add support for musl, which modified the libgcc/unwind-dw2-fde-dip.c logic to decide whether USE_PT_GNU_EH_FRAME should be enabled or not. It completely removed the existing logic, replacing it by a single logic based on the definition of TARGET_DL_ITERATE_PHDR. However, this constant gets defined by the configure script only for Solaris, or Linux Musl platforms. For glibc/uClibc, the configure script does not define it, and therefore USE_PT_GNU_EH_FRAME is not defined, causing issues with exception handling. This patch fixes that by restoring all the logic of libgcc/unwind-dw2-fde-dip.c, and just adding the musl logic as one more case. It has been successfully runtime tested using the two code examples provided in bug #7208, with uClibc, musl and glibc. Cc: Krzysztof Wrzalik <kwrzalik@gmail.com> Cc: David Bachelart <david.bachelart@bbright.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
This commit is contained in:
Thomas Petazzoni
Peter Korsgaard
parent
543bc7c921
commit
6953d5ffeb
@ -13,6 +13,12 @@ https://bitbucket.org/GregorR/musl-cross/src. Compared to the upstream version:
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causing build failure. Bug reported upstream at
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https://bitbucket.org/GregorR/musl-gcc-patches/issue/4/musl-gcc-patches-break-the-build-on.
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* change the USE_PT_GNU_EH_FRAME logic to keep the existing gcc logic
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and only add the musl one as an addition, not as a replacement. Not
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doing this breaks C++ exception handling with glibc, because
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USE_PT_GNU_EH_FRAME doesn't get defined due to the configure script
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not testing dl_iterate_phdr() on any system except Solaris.
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[Gustavo: remove upstream applied gcc/config/sh/sh.c chunk for 4.9.1]
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Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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---
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@ -54,7 +60,7 @@ Index: b/gcc/config.gcc
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*)
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tm_defines="$tm_defines DEFAULT_LIBC=LIBC_GLIBC"
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;;
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@@ -2323,6 +2326,10 @@
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@@ -2322,6 +2325,10 @@
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powerpc*-*-linux*paired*)
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tm_file="${tm_file} rs6000/750cl.h" ;;
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esac
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@ -446,7 +452,7 @@ Index: b/gcc/configure
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===================================================================
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--- a/gcc/configure
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+++ b/gcc/configure
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@@ -27300,6 +27300,9 @@
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@@ -27328,6 +27328,9 @@
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else
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gcc_cv_libc_provides_ssp=no
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case "$target" in
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@ -456,7 +462,7 @@ Index: b/gcc/configure
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*-*-linux* | *-*-kfreebsd*-gnu | *-*-knetbsd*-gnu)
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# glibc 2.4 and later provides __stack_chk_fail and
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# either __stack_chk_guard, or TLS access to stack guard canary.
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@@ -27332,6 +27335,7 @@
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@@ -27360,6 +27363,7 @@
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# <http://gcc.gnu.org/ml/gcc/2008-10/msg00130.html>) and for now
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# simply assert that glibc does provide this, which is true for all
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# realistically usable GNU/Hurd configurations.
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@ -464,7 +470,7 @@ Index: b/gcc/configure
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gcc_cv_libc_provides_ssp=yes;;
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*-*-darwin* | *-*-freebsd*)
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ac_fn_c_check_func "$LINENO" "__stack_chk_fail" "ac_cv_func___stack_chk_fail"
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@@ -27421,6 +27425,9 @@
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@@ -27449,6 +27453,9 @@
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gcc_cv_target_dl_iterate_phdr=no
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fi
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;;
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@ -478,7 +484,7 @@ Index: b/gcc/configure.ac
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===================================================================
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--- a/gcc/configure.ac
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+++ b/gcc/configure.ac
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@@ -5001,6 +5001,9 @@
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@@ -5016,6 +5016,9 @@
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gcc_cv_libc_provides_ssp,
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[gcc_cv_libc_provides_ssp=no
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case "$target" in
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@ -488,7 +494,7 @@ Index: b/gcc/configure.ac
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*-*-linux* | *-*-kfreebsd*-gnu | *-*-knetbsd*-gnu)
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# glibc 2.4 and later provides __stack_chk_fail and
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# either __stack_chk_guard, or TLS access to stack guard canary.
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@@ -5027,6 +5030,7 @@
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@@ -5042,6 +5045,7 @@
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# <http://gcc.gnu.org/ml/gcc/2008-10/msg00130.html>) and for now
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# simply assert that glibc does provide this, which is true for all
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# realistically usable GNU/Hurd configurations.
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@ -496,7 +502,7 @@ Index: b/gcc/configure.ac
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gcc_cv_libc_provides_ssp=yes;;
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*-*-darwin* | *-*-freebsd*)
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AC_CHECK_FUNC(__stack_chk_fail,[gcc_cv_libc_provides_ssp=yes],
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@@ -5093,6 +5097,9 @@
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@@ -5108,6 +5112,9 @@
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gcc_cv_target_dl_iterate_phdr=no
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fi
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;;
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@ -538,43 +544,17 @@ Index: b/libgcc/unwind-dw2-fde-dip.c
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===================================================================
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--- a/libgcc/unwind-dw2-fde-dip.c
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+++ b/libgcc/unwind-dw2-fde-dip.c
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@@ -46,33 +46,13 @@
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#include "unwind-compat.h"
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#include "gthr.h"
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-#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
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- && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ > 2) \
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- || (__GLIBC__ == 2 && __GLIBC_MINOR__ == 2 && defined(DT_CONFIG)))
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-# define USE_PT_GNU_EH_FRAME
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-#endif
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-
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-#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
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- && defined(__BIONIC__)
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-# define USE_PT_GNU_EH_FRAME
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-#endif
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-
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-#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
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- && defined(__FreeBSD__) && __FreeBSD__ >= 7
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-# define ElfW __ElfN
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-# define USE_PT_GNU_EH_FRAME
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-#endif
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-
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-#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
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- && defined(__OpenBSD__)
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-# define ElfW(type) Elf_##type
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-# define USE_PT_GNU_EH_FRAME
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-#endif
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-
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-#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
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- && defined(TARGET_DL_ITERATE_PHDR) \
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- && defined(__sun__) && defined(__svr4__)
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+#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) && defined(TARGET_DL_ITERATE_PHDR)
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@@ -73,6 +73,13 @@
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&& defined(TARGET_DL_ITERATE_PHDR) \
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&& defined(__sun__) && defined(__svr4__)
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# define USE_PT_GNU_EH_FRAME
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+# ifdef __OpenBSD__
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+# define ElfW(type) Elf_##type
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+# elif defined(__FreeBSD__) && __FreeBSD__ >= 7
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+# define ElfW __ElfN
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+# endif
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+ #endif
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+
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+/* For musl libc, TARGET_DL_ITERATE_PHDR gets defined by the configure
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+ script. */
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+#if !defined(inhibit_libc) && defined(HAVE_LD_EH_FRAME_HDR) \
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+ && defined(TARGET_DL_ITERATE_PHDR)
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+# define USE_PT_GNU_EH_FRAME
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#endif
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#if defined(USE_PT_GNU_EH_FRAME)
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