pyrox.dev
1As originally implemented, the error message check
2described in the configure script
3breaks detection of Ada compiler support on x86_64-darwin,
4because the assembler in the version of cctools currently used
5unconditionally emits a deprecation message to stdout,
6with no way to disable it.
7
8Furthermore, GCC 3.4 was the minimum version needed to build GNAT
9as far back as GCC 4.4 (see the GCC git repo, tags/releases/gcc-4.4.0,
10gcc/doc/install.texi, lines 2052-2053 [1]);
11GCC 3.4 is newer than any of the broken GCC versions
12that the configure script works around
13(see the part of the comment in the configure script
14before the context in the patch below),
15and GCC 4.4 is older than any GCC that Nix currently packages (GCC 4.8).
16
17We therefore choose to not check for error messages,
18and just check for an error code.
19There's no harm in still checking for an object file being created, though.
20
21[1]: https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=gcc/doc/install.texi;h=6bdfbece981f7fb6c26da672d45e5d3ba7879c69;hb=b7fc996728085c0591ea7c5d0e1c84a8f6a29bd8#l2052
22--- a/configure 2022-08-19 18:09:52.000000000 +1000
23+++ b/configure 2022-12-26 17:30:49.000000000 +1100
24@@ -5622,8 +5622,7 @@
25 # Other compilers, like HP Tru64 UNIX cc, exit successfully when
26 # given a .adb file, but produce no object file. So we must check
27 # if an object file was really produced to guard against this.
28-errors=`(${CC} -c conftest.adb) 2>&1 || echo failure`
29-if test x"$errors" = x && test -f conftest.$ac_objext; then
30+if ${CC} -c conftest.adb && test -f conftest.$ac_objext; then
31 acx_cv_cc_gcc_supports_ada=yes
32 fi
33 rm -f conftest.*