vasilito
068a1ca63e
Bootloader fork rebase:
- Base changed from 0.1.0 pre-patched archive to upstream 1.0.0 tag (c7eeb9f)
- Applied 0001-redbear-local-forks.patch (Cargo.toml crate path redirects)
- Applied fix-uefi-alloc-panic.patch equivalents (4 panic!() -> graceful
error handling in src/main.rs)
- Applied P5-live-preload-cap-1gib.patch (1 GiB cap on live image preload)
- Skipped: P0 GPT partition scan (requires new module + integration),
P1 timeout/default-resolution, P2 live preload guard (subsumed by
panic fixes + cap), P3 live image safe read, P4 large ISO boot,
redox.patch — to be applied in dedicated rebase session.
firmware-loader/Cargo.toml: version 0.1.0 -> 0.3.0 (sync with other
Red Bear custom crates which are at 0.3.0).
fork-upstream-map.toml: bootloader back from PENDING_REBASE to 1.0.0
since the partial rebase matches upstream 1.0.0 content.
fork-upstream-map.toml: base restored to 'main' tracked (was correctly
tracked by build-redbear.sh).
85 lines
3.5 KiB
Plaintext
85 lines
3.5 KiB
Plaintext
# visibility.m4
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# serial 9
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dnl Copyright (C) 2005, 2008, 2010-2025 Free Software Foundation, Inc.
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dnl This file is free software; the Free Software Foundation
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dnl gives unlimited permission to copy and/or distribute it,
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dnl with or without modifications, as long as this notice is preserved.
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dnl This file is offered as-is, without any warranty.
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dnl From Bruno Haible.
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dnl Tests whether the compiler supports the command-line option
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dnl -fvisibility=hidden and the function and variable attributes
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dnl __attribute__((__visibility__("hidden"))) and
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dnl __attribute__((__visibility__("default"))).
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dnl Does *not* test for __visibility__("protected") - which has tricky
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dnl semantics (see the 'vismain' test in glibc) and does not exist e.g. on
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dnl Mac OS X.
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dnl Does *not* test for __visibility__("internal") - which has processor
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dnl dependent semantics.
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dnl Does *not* test for #pragma GCC visibility push(hidden) - which is
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dnl "really only recommended for legacy code".
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dnl Set the variable CFLAG_VISIBILITY.
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dnl Defines and sets the variable HAVE_VISIBILITY.
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AC_DEFUN([gl_VISIBILITY],
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[
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AC_REQUIRE([AC_PROG_CC])
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CFLAG_VISIBILITY=
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HAVE_VISIBILITY=0
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if test -n "$GCC"; then
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dnl First, check whether -Werror can be added to the command line, or
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dnl whether it leads to an error because of some other option that the
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dnl user has put into $CC $CFLAGS $CPPFLAGS.
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AC_CACHE_CHECK([whether the -Werror option is usable],
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[gl_cv_cc_vis_werror],
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[gl_saved_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -Werror"
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM([[]], [[]])],
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[gl_cv_cc_vis_werror=yes],
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[gl_cv_cc_vis_werror=no])
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CFLAGS="$gl_saved_CFLAGS"
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])
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dnl Now check whether visibility declarations are supported.
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AC_CACHE_CHECK([for simple visibility declarations],
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[gl_cv_cc_visibility],
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[gl_saved_CFLAGS="$CFLAGS"
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CFLAGS="$CFLAGS -fvisibility=hidden"
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dnl We use the option -Werror and a function dummyfunc, because on some
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dnl platforms (Cygwin 1.7) the use of -fvisibility triggers a warning
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dnl "visibility attribute not supported in this configuration; ignored"
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dnl at the first function definition in every compilation unit, and we
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dnl don't want to use the option in this case.
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if test $gl_cv_cc_vis_werror = yes; then
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CFLAGS="$CFLAGS -Werror"
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fi
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AC_COMPILE_IFELSE(
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[AC_LANG_PROGRAM(
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[[extern __attribute__((__visibility__("hidden"))) int hiddenvar;
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extern __attribute__((__visibility__("default"))) int exportedvar;
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extern __attribute__((__visibility__("hidden"))) int hiddenfunc (void);
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extern __attribute__((__visibility__("default"))) int exportedfunc (void);
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void dummyfunc (void);
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int hiddenvar;
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int exportedvar;
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int hiddenfunc (void) { return 51; }
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int exportedfunc (void) { return 1225736919; }
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void dummyfunc (void) {}
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]],
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[[]])],
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[gl_cv_cc_visibility=yes],
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[gl_cv_cc_visibility=no])
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CFLAGS="$gl_saved_CFLAGS"
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])
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if test $gl_cv_cc_visibility = yes; then
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CFLAG_VISIBILITY="-fvisibility=hidden"
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HAVE_VISIBILITY=1
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fi
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fi
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AC_SUBST([CFLAG_VISIBILITY])
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AC_SUBST([HAVE_VISIBILITY])
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AC_DEFINE_UNQUOTED([HAVE_VISIBILITY], [$HAVE_VISIBILITY],
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[Define to 1 or 0, depending whether the compiler supports simple visibility declarations.])
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])
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