21 files changed, 303 insertions, 91 deletions
diff --git a/sysdeps/aarch64/elf-initfini.h b/sysdeps/aarch64/elf-initfini.h
new file mode 100644
index 0000000000..bb436065a8
--- /dev/null
+++ b/sysdeps/aarch64/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  AArch64 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/init_array/pt-crti.S b/sysdeps/alpha/elf-initfini.h
index 24c8a5d4d6..69d056d493 100644
--- a/sysdeps/init_array/pt-crti.S
+++ b/sysdeps/alpha/elf-initfini.h
@@ -1,5 +1,5 @@
-/* Special initializer support for libpthread.
-   Copyright (C) 2015-2020 Free Software Foundation, Inc.
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  Alpha version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -16,8 +16,5 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-/* This arranges for libpthread.so's special initializer to be called as
-   soon as the library is loaded.  */
-
-	.section .init_array,"a",%init_array
-	.dc.a __pthread_initialize_minimal_internal
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/arm/elf-initfini.h b/sysdeps/arm/elf-initfini.h
new file mode 100644
index 0000000000..24f22352db
--- /dev/null
+++ b/sysdeps/arm/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  Arm version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/csky/Implies b/sysdeps/csky/Implies
index fd80b4826e..f8c3a7586e 100644
--- a/sysdeps/csky/Implies
+++ b/sysdeps/csky/Implies
@@ -1,4 +1,3 @@
-init_array
 wordsize-32
 # C-SKY uses IEEE 754 floating point.
 ieee754/flt-32
diff --git a/sysdeps/init_array/crti.S b/sysdeps/generic/crti.S
index 145c918f93..82d6dc0d91 100644
--- a/sysdeps/init_array/crti.S
+++ b/sysdeps/generic/crti.S
@@ -12,12 +12,18 @@
    toolchains without .init_array support can use this to avoid the
    superfluous .init and .fini boilerplate code.  */
 
-#ifdef PREINIT_FUNCTION
+#include <elf-initfini.h>
 
-#if PREINIT_FUNCTION_WEAK
-# error PREINIT_FUNCTION_WEAK is unsupported
+#if ELF_INITFINI
+# error Cannot use default crti.S because it lacks _init code
 #endif
 
+#ifdef PREINIT_FUNCTION
+
+# if PREINIT_FUNCTION_WEAK
+#  error PREINIT_FUNCTION_WEAK is unsupported
+# endif
+
 /* This arranges for PREINIT_FUNCTION to be called upon loading a library that
    contains crti.o.  */
 
diff --git a/sysdeps/init_array/crtn.S b/sysdeps/generic/crtn.S
index 6f70e77160..d92b07dd0b 100644
--- a/sysdeps/init_array/crtn.S
+++ b/sysdeps/generic/crtn.S
@@ -11,3 +11,9 @@
    But new configurations without compatibility concerns for
    toolchains without .init_array support can use this to avoid the
    superfluous .init and .fini boilerplate code.  */
+
+#include <elf-initfini.h>
+
+#if ELF_INITFINI
+# error Cannot use genetric crtn.S because it lacks _fini code
+#endif
diff --git a/sysdeps/generic/elf-initfini.h b/sysdeps/generic/elf-initfini.h
new file mode 100644
index 0000000000..75e920d283
--- /dev/null
+++ b/sysdeps/generic/elf-initfini.h
@@ -0,0 +1,24 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Legacy platforms define this to 1.  If 0, the dynamic linker
+   ignores the DT_INIT and DT_FINI tags, and static binaries will not
+   call the _init or _fini functions.  If 1, the old constructor
+   mechanisms are used in addition to the initarray/finiarray
+   support.  */
+#define ELF_INITFINI 0
diff --git a/sysdeps/hppa/elf-initfini.h b/sysdeps/hppa/elf-initfini.h
new file mode 100644
index 0000000000..28f84bb039
--- /dev/null
+++ b/sysdeps/hppa/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  HPPA version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/ia64/elf-initfini.h b/sysdeps/ia64/elf-initfini.h
new file mode 100644
index 0000000000..feccba6799
--- /dev/null
+++ b/sysdeps/ia64/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  IA64 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/init_array/elf-init.c b/sysdeps/init_array/elf-init.c
deleted file mode 100644
index b204bd1de9..0000000000
--- a/sysdeps/init_array/elf-init.c
+++ /dev/null
@@ -1,37 +0,0 @@
-/* Startup support for ELF initializers/finalizers in the main executable.
-   Copyright (C) 2013-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   In addition to the permissions in the GNU Lesser General Public
-   License, the Free Software Foundation gives you unlimited
-   permission to link the compiled version of this file with other
-   programs, and to distribute those programs without any restriction
-   coming from the use of this file. (The GNU Lesser General Public
-   License restrictions do apply in other respects; for example, they
-   cover modification of the file, and distribution when not linked
-   into another program.)
-
-   Note that people who make modified versions of this file are not
-   obligated to grant this special exception for their modified
-   versions; it is their choice whether to do so. The GNU Lesser
-   General Public License gives permission to release a modified
-   version without this exception; this exception also makes it
-   possible to release a modified version which carries forward this
-   exception.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-#define NO_INITFINI
-#include <csu/elf-init.c>
diff --git a/sysdeps/init_array/gmon-start.c b/sysdeps/init_array/gmon-start.c
deleted file mode 100644
index 20f51feafe..0000000000
--- a/sysdeps/init_array/gmon-start.c
+++ /dev/null
@@ -1,41 +0,0 @@
-/* gmon startup hook using .preinit_array.
-   Copyright (C) 2013-2020 Free Software Foundation, Inc.
-   This file is part of the GNU C Library.
-
-   The GNU C Library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 2.1 of the License, or (at your option) any later version.
-
-   In addition to the permissions in the GNU Lesser General Public
-   License, the Free Software Foundation gives you unlimited
-   permission to link the compiled version of this file with other
-   programs, and to distribute those programs without any restriction
-   coming from the use of this file.  (The GNU Lesser General Public
-   License restrictions do apply in other respects; for example, they
-   cover modification of the file, and distribution when not linked
-   into another program.)
-
-   Note that people who make modified versions of this file are not
-   obligated to grant this special exception for their modified
-   versions; it is their choice whether to do so.  The GNU Lesser
-   General Public License gives permission to release a modified
-   version without this exception; this exception also makes it
-   possible to release a modified version which carries forward this
-   exception.
-
-   The GNU C Library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with the GNU C Library; if not, see
-   <https://www.gnu.org/licenses/>.  */
-
-/* Instead of defining __gmon_start__ globally in gcrt1.o, we make it
-   static and just put a pointer to it into the .preinit_array section.  */
-
-#define GMON_START_ARRAY_SECTION	".preinit_array"
-
-#include <csu/gmon-start.c>
diff --git a/sysdeps/m68k/elf-initfini.h b/sysdeps/m68k/elf-initfini.h
new file mode 100644
index 0000000000..103b402866
--- /dev/null
+++ b/sysdeps/m68k/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  m68k version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/microblaze/elf-initfini.h b/sysdeps/microblaze/elf-initfini.h
new file mode 100644
index 0000000000..8fcb2cab0d
--- /dev/null
+++ b/sysdeps/microblaze/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader, for Microblaze.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/mips/elf-initfini.h b/sysdeps/mips/elf-initfini.h
new file mode 100644
index 0000000000..9e8b6eed83
--- /dev/null
+++ b/sysdeps/mips/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  MIPS version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/nios2/elf-initfini.h b/sysdeps/nios2/elf-initfini.h
new file mode 100644
index 0000000000..498ca35b8e
--- /dev/null
+++ b/sysdeps/nios2/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  nios2 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/powerpc/elf-initfini.h b/sysdeps/powerpc/elf-initfini.h
new file mode 100644
index 0000000000..ca89f427f2
--- /dev/null
+++ b/sysdeps/powerpc/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader, for powerpc.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/riscv/Implies b/sysdeps/riscv/Implies
index c88325b8be..1945b1f4bb 100644
--- a/sysdeps/riscv/Implies
+++ b/sysdeps/riscv/Implies
@@ -1,5 +1,3 @@
-init_array
-
 ieee754/ldbl-128
 ieee754/dbl-64
 ieee754/flt-32
diff --git a/sysdeps/s390/elf-initfini.h b/sysdeps/s390/elf-initfini.h
new file mode 100644
index 0000000000..531c764ae2
--- /dev/null
+++ b/sysdeps/s390/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  S/390 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/sh/elf-initfini.h b/sysdeps/sh/elf-initfini.h
new file mode 100644
index 0000000000..0aeda572b2
--- /dev/null
+++ b/sysdeps/sh/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  SH version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/sparc/elf-initfini.h b/sysdeps/sparc/elf-initfini.h
new file mode 100644
index 0000000000..e482fe6eca
--- /dev/null
+++ b/sysdeps/sparc/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  SPARC version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1
diff --git a/sysdeps/x86/elf-initfini.h b/sysdeps/x86/elf-initfini.h
new file mode 100644
index 0000000000..7a48ebda92
--- /dev/null
+++ b/sysdeps/x86/elf-initfini.h
@@ -0,0 +1,20 @@
+/* Determine DT_INIT/DT_FINI support in the dynamic loader.  x86 version.
+   Copyright (C) 2020 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <https://www.gnu.org/licenses/>.  */
+
+/* Enable DT_INIT/DT_FINI support.  */
+#define ELF_INITFINI 1