34 lines
1.6 KiB
Diff
34 lines
1.6 KiB
Diff
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As originally implemented, the error message check
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described in the configure script
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breaks detection of Ada compiler support on x86_64-darwin,
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because the assembler in the version of cctools currently used
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unconditionally emits a deprecation message to stdout,
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with no way to disable it.
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Furthermore, GCC 3.4 was the minimum version needed to build GNAT
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as far back as GCC 4.4 (see the GCC git repo, tags/releases/gcc-4.4.0,
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gcc/doc/install.texi, lines 2052-2053 [1]);
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GCC 3.4 is newer than any of the broken GCC versions
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that the configure script works around
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(see the part of the comment in the configure script
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before the context in the patch below),
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and GCC 4.4 is older than any GCC that Nix currently packages (GCC 4.8).
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We therefore choose to not check for error messages,
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and just check for an error code.
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There's no harm in still checking for an object file being created, though.
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[1]: https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/doc/install.texi;h=6bdfbece981f7fb6c26da672d45e5d3ba7879c69;hb=b7fc996728085c0591ea7c5d0e1c84a8f6a29bd8#l2052
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--- a/configure 2022-08-19 18:09:52.000000000 +1000
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+++ b/configure 2022-12-26 17:30:49.000000000 +1100
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@@ -5622,8 +5622,7 @@
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# Other compilers, like HP Tru64 UNIX cc, exit successfully when
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# given a .adb file, but produce no object file. So we must check
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# if an object file was really produced to guard against this.
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-errors=`(${CC} -c conftest.adb) 2>&1 || echo failure`
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-if test x"$errors" = x && test -f conftest.$ac_objext; then
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+if ${CC} -c conftest.adb && test -f conftest.$ac_objext; then
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acx_cv_cc_gcc_supports_ada=yes
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fi
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rm -f conftest.*
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