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On bare-metal targets, I/O support is typically provided by a BSP and
requires a linker script and/or hosting library to be specified on the
linker command line. Linking an empty program with the default linker
script may succeed, however, which confuses libstdc++ configuration
when programs that probe for the presence of various I/O features fail
with link errors.
2020-02-12 Sandra Loosemore <sandra@codesourcery.com>
PR libstdc++/79193
PR libstdc++/88999
config/
* no-executables.m4: Use a non-empty program to test for linker
support.
libgcc/
* configure: Regenerated.
libgfortran/
* configure: Regenerated.
libiberty/
* configure: Regenerated.
libitm/
* configure: Regenerated.
libobjc/
* configure: Regenerated.
libquadmath/
* configure: Regenerated.
libssp/
* configure: Regenerated.
libstdc++v-3/
* configure: Regenerated.
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newer.
config/
* extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): Do not expand
for Autoconf 2.62 or newer.
* tls.m4 (GCC_CHECK_TLS): Fix m4 quotation.
* no-executables.m4 (_AC_COMPILER_EXEEXT): Fix m4 quotation.
* override.m4 (m4_copy_force, m4_rename_force): Provide
macros if not defined.
(AC_PREREQ): Use m4_copy_force.
boehm-gc/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libada/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libffi/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libgfortran/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libgomp/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libjava/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libmudflap/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libobjc/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libssp/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
zlib/
* configure.ac (_AC_ARG_VAR_PRECIOUS): Use m4_rename_force.
libstdc++-v3/
* acinclude.m4 (GLIBCXX_CONFIGURE): Use m4_rename_force.
From-SVN: r150269
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config/
* no-executables.m4 (GCC_TRY_COMPILE_OR_LINK): New function.
libstdc++-v3/
libstdc++/
* acinclude.m4 (GLIBCXX_ENABLE_C99): Temporarily add
-fno-exceptions to CXXFLAGS. Use GCC_TRY_COMPILE_OR_LINK.
Make the tests assign results to volatile variables. Use -lm
for link tests in GCC_TRY_COMPILE_OR_LINK. Fall back to
compile-only tests if -lm is not available.
* configure: Regenerate.
From-SVN: r128982
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config/
Revert:
2007-10-02 Richard Sandiford <richard@codesourcery.com>
* no-executables.m4 (GCC_TRY_COMPILE_OR_LINK): New function.
libstdc++/
Revert:
2007-10-02 Richard Sandiford <richard@codesourcery.com>
* acinclude.m4 (GLIBCXX_ENABLE_C99): Temporarily add
-fno-exceptions to CXXFLAGS. Use GCC_TRY_COMPILE_OR_LINK.
Make the tests assign results to volatile variables.
* configure: Regenerate.
From-SVN: r128972
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config/
* no-executables.m4 (GCC_TRY_COMPILE_OR_LINK): New function.
libstdc++/
* acinclude.m4 (GLIBCXX_ENABLE_C99): Temporarily add
-fno-exceptions to CXXFLAGS. Use GCC_TRY_COMPILE_OR_LINK.
Make the tests assign results to volatile variables.
* configure: Regenerate.
From-SVN: r128959
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config/:
PR libgcj/19877:
* no-executables.m4: Call real AC_FUNC_MMAP when cache variable
is set but not 'no'.
libstdc++-v3/:
PR libgcj/19877:
* configure, aclocal.m4: Rebuilt.
* Makefile.in, include/Makefile.in, libmath/Makefile.in,
libsupc++/Makefile.in, po/Makefile.in, src/Makefile.in,
testsuite/Makefile.in: Likewise.
libjava/:
PR libgcj/19877:
* configure, aclocal.m4, Makefile.in: Rebuilt.
libgfortran/:
PR libgcj/19877:
* configure, aclocal.m4, Makefile.in: Rebuilt.
zlib/:
PR libgcj/19877:
* configure, aclocal.m4, Makefile.in: Rebuilt.
From-SVN: r100953
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From-SVN: r70855
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