66 lines
2.5 KiB
Diff
66 lines
2.5 KiB
Diff
# Building libstdc++-v3 for a bare-bones compiler is somewhat in a gray area
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# since we don't have a full hosted system to target. From a version of GCC to
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# the next this might break in minor ways.
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#
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# Here, the issue is the reliance on a dlopen() check which cannot be
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# completed because we don't have link tests. The intent of the configure
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# script is to skip it for cross-compilers, which is materialized by the check
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# for --with-newlib (which is somewhat abused to mean "no libc").
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#
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# However, building with --with-newlib is not quite right since we have our
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# own libc and fails due to it enabling small newlib-specific bits of code
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# that don't compile with the fxlibc.
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#
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# Instead, we disable the test when --without-headers is specified, which is
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# the case in our configuration. This extra condition is already part of the
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# upstreamed source in GCC 12.1.0, so this is basically a backport. We also
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# backport disabling the GLIBCXX_CROSSCONFIG which would block the build.
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#
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# Explanations about the gray area:
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# <https://gcc.gnu.org/legacy-ml/gcc/2008-03/msg00515.html>
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# Commit introducing this test in GCC 12.1.0:
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# <https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=68c2e9e9234cb301e9e81792cad233a41e797792>
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# GCC bug motivating the commit:
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# <https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103866>
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--- gcc-11.1.0/libstdc++-v3/configure.ac 2021-04-27 12:00:16.000000000 +0200
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+++ gcc-11.1.0/libstdc++-v3/configure2.ac 2022-08-15 22:53:21.730140593 +0200
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@@ -90,7 +90,7 @@
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GLIBCXX_CONFIGURE
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# Libtool setup.
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-if test "x${with_newlib}" != "xyes" && test "x${with_avrlibc}" != "xyes"; then
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+if test "x${with_newlib}" != "xyes" && test "x${with_avrlibc}" != "xyes" && test "x${with_headers}" != "xno"; then
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AC_LIBTOOL_DLOPEN
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fi
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AM_PROG_LIBTOOL
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@@ -353,7 +353,7 @@
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AC_DEFINE(HAVE_ICONV)
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AC_DEFINE(HAVE_MEMALIGN)
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- else
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+ elif test "x${with_headers}" != "xno"; then
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GLIBCXX_CROSSCONFIG
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fi
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--- gcc-11.1.0/libstdc++-v3/configure 2022-08-15 22:37:29.043460208 +0200
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+++ gcc-11.1.0/libstdc++-v3/configure2 2022-08-15 22:37:03.403459840 +0200
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@@ -5903,7 +5903,7 @@
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# Libtool setup.
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-if test "x${with_newlib}" != "xyes" && test "x${with_avrlibc}" != "xyes"; then
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+if test "x${with_newlib}" != "xyes" && test "x${with_avrlibc}" != "xyes" && test "x${with_headers}" != "xno"; then
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enable_dlopen=yes
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@@ -29266,7 +29266,7 @@
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$as_echo "#define HAVE_MEMALIGN 1" >>confdefs.h
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- else
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+ elif test "x${with_headers}" != "xno"; then
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# Base decisions on target environment.
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case "${host}" in
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